Description:FIELD OF DISCLOSURE
[0001] The present disclosure relates generally relates to the field of wastewater treatment systems. More specifically, it pertains to a low-cost industrial wastewater treatment system using ceramicware membrane technology.
BACKGROUND OF THE DISCLOSURE
[0002] Industrialization has been a pivotal force behind economic progress, but it has also led to environmental challenges, the most prominent being water pollution.
[0003] A wide range of industries including textiles, pharmaceuticals, chemicals, food processing, and mining generate substantial quantities of wastewater rich in organic matter, heavy metals, dyes, oils, acids, alkalis, and other hazardous contaminants.
[0004] This untreated or poorly treated effluent often finds its way into rivers, lakes, and groundwater systems, posing a serious threat to human health, aquatic ecosystems, and agricultural productivity.
[0005] Despite stringent environmental regulations in many parts of the world, a significant percentage of industrial units especially in developing nations still discharge wastewater without proper treatment due to the high costs associated with advanced purification technologies.
[0006] Conventional wastewater treatment methods, including activated sludge processes, sedimentation, oxidation, and chemical coagulation, although effective to a certain extent, often fall short when it comes to dealing with complex and persistent pollutants.
[0007] These traditional approaches also involve high operational and maintenance costs, dependency on electricity and chemical reagents, and often require a large footprint, making them unsuitable for decentralized or small-to-medium scale industrial applications.
[0008] Moreover, these systems frequently produce large volumes of sludge, which adds to the secondary pollution burden and necessitates further treatment or disposal.
[0009] Membrane-based separation techniques such as reverse osmosis (RO), nanofiltration (NF), ultrafiltration (UF), and microfiltration (MF) have emerged in recent years as effective methods for removing dissolved salts, organic molecules, microbes, and particulates from wastewater.
[0010] However, polymeric membranes commonly used in such systems are known to suffer from several limitations, including low chemical and thermal resistance, fouling tendencies, and relatively short operational lifespan.
[0011] Additionally, the production of high-performance synthetic membranes often requires costly raw materials and specialized manufacturing processes, which translates into elevated capital and operating expenditures.
[0012] This makes them less accessible for industries operating on constrained budgets, particularly in remote or underdeveloped regions.
[0013] Amid these challenges, ceramic membranes have surfaced as a promising alternative due to their superior thermal stability, mechanical strength, chemical resistance, and longer service life compared to their polymeric counterparts.
[0014] Traditionally, ceramic membranes are made from expensive raw materials like alumina, zirconia, or titania, and involve high-temperature sintering processes, which significantly elevate the overall production cost.
[0015] These economic barriers have restricted their widespread adoption in industrial wastewater treatment applications, despite their robust performance and durability.
[0016] The need of the hour is a cost-effective, sustainable, and decentralized membrane-based system that leverages the benefits of ceramic technology while addressing its affordability and accessibility issues.
[0017] One of the primary disadvantages of using ceramicware membranes in industrial wastewater treatment is their limited mechanical robustness under high pressure.
[0018] While ceramic membranes are known for their hardness and thermal resistance, those made from low-cost ceramicware, particularly handcrafted or locally sourced variants, often lack uniform pore size distribution and structural integrity.
[0019] These inconsistencies can lead to mechanical failure, cracking, or breakage under high operational pressures commonly found in industrial effluent systems.
[0020] Unlike industrial-grade sintered ceramic membranes, low-cost variants might not be engineered to handle the hydraulic loads of continuous industrial use, thereby risking system shutdowns or frequent replacements.
[0021] Another critical concern relates to membrane fouling, which is a common issue in all membrane-based filtration systems but becomes more pronounced in low-cost ceramic membranes.
[0022] Fouling refers to the accumulation of particles, microorganisms, or chemical substances on the membrane surface or within its pores, reducing its permeability and filtration efficiency over time.
[0023] In industrial wastewater applications, which often contain complex mixtures of organic and inorganic contaminants, fouling can occur rapidly. Low-cost ceramicware membranes, due to their irregular surface morphology and heterogeneous pore structure, are particularly susceptible to such fouling.
[0024] The cleaning of these membranes may require harsh chemical treatments or physical scrubbing, which may damage the membrane and shorten its lifespan, thereby undermining the supposed cost-effectiveness.
[0025] The issue of chemical resistance further complicates the utility of low-cost ceramic membranes in industrial settings.
[0026] Industrial effluents often contain highly acidic or alkaline substances, heavy metals, and solvents that may react with the clay or ceramic composition of the membrane.
[0027] While high-purity ceramics can be engineered for chemical resistance, low-cost ceramicware membranes are typically made from cheaper raw materials that lack the stability needed to withstand aggressive chemical environments.
[0028] This can lead to leaching of membrane materials, degradation of the ceramic matrix, and contamination of the treated water, posing environmental and health risks.
[0029] In addition to chemical instability, thermal resistance under fluctuating conditions presents another disadvantage. Although ceramic membranes are generally known for their heat resistance, low-cost variants may have inconsistencies in sintering temperatures or material purity, making them vulnerable to thermal shock.
[0030] Industrial wastewater streams may have varying temperatures depending on the process stage, and sudden thermal changes can cause expansion or contraction of the membrane material, leading to cracking or detachment from the housing structure.
[0031] This limits the use of such systems in industries like textiles, pharmaceuticals, and chemical manufacturing, where effluent temperatures are not constant.
[0032] The scalability of low-cost ceramicware membrane systems is another limiting factor. While the technology may be effective in small-scale or pilot projects, scaling up for large industrial operations poses significant challenges.
[0033] The manual or semi-automated production methods used to fabricate these membranes cannot always ensure consistency and quality control at a mass-production level.
[0034] Moreover, integrating multiple ceramicware membrane units to treat large volumes of wastewater increases the complexity of the system, requires more space, and introduces more points of failure.
[0035] This makes the technology less attractive to industries that require high-throughput treatment facilities.
[0036] Furthermore, the compatibility of ceramicware membranes with existing industrial infrastructure is not always seamless.
[0037] Most industrial facilities have legacy systems designed for conventional treatment technologies like activated sludge processes, chemical precipitation, or high-grade polymeric membranes.
[0038] Retrofitting or replacing these systems to accommodate ceramicware membranes involves additional capital investment and operational adjustments.
[0039] The need for new support structures, plumbing systems, and control mechanisms to ensure optimal flow rates and pressure settings can offset the initial cost savings of using low-cost ceramicware membranes.
[0040] Another major disadvantage lies in the limited range of contaminant removal offered by these membranes.
[0041] While ceramic membranes are effective for removing suspended solids, turbidity, and certain microorganisms, their performance in eliminating dissolved salts, heavy metals, and specific organic pollutants is often inadequate without pre- or post-treatment processes.
[0042] This necessitates the integration of additional treatment stages such as ion exchange, adsorption, or advanced oxidation, which increases the overall complexity and cost of the wastewater treatment system.
[0043] Thus, while marketed as a low-cost solution, the complete treatment train involving ceramicware membranes may not be economically viable in practice.
[0044] From a maintenance perspective, the fragility and cleaning requirements of low-cost ceramic membranes pose significant challenges.
[0045] Regular cleaning to prevent fouling can involve physical scrubbing, which risks damaging the membrane, especially if the ceramicware is porous or loosely structured.
[0046] Additionally, the frequency of replacement due to cracking or performance degradation can be high, particularly in harsh industrial environments. This not only leads to recurring operational costs but also increases system downtime, thereby affecting industrial productivity and compliance with discharge regulations.
[0047] The environmental footprint of low-cost ceramic membrane systems, although initially perceived as minimal, also warrants scrutiny.
[0048] The sourcing of raw materials, including clay and other additives, may involve environmentally disruptive mining practices. Furthermore, the firing process required to produce ceramic membranes at even modest performance levels consumes significant energy and emits greenhouse gases.
[0049] In low-cost setups where energy efficiency and emission control are not prioritized, this production process could negate the sustainability claims associated with ceramic membrane technology.
[0050] Another often overlooked disadvantage is the lack of standardized testing and certification for low-cost ceramic membranes.
[0051] In the absence of uniform quality benchmarks and regulatory standards, the performance and safety of these membranes can vary significantly across manufacturers and batches.
[0052] This inconsistency can lead to operational risks, regulatory violations, or even failure in critical industrial applications.
[0053] Without certification, it also becomes difficult for industries to adopt these systems with confidence, especially in regions where environmental discharge standards are stringent.
[0054] Lastly, the technical know-how required for installation, monitoring, and troubleshooting of ceramic membrane systems can limit their practical adoption in industries with limited engineering support.
[0055] Low-cost systems often lack the automation and sensors found in modern wastewater treatment units, making them dependent on manual operation.
[0056] This necessitates continuous monitoring and skilled personnel, which might not be readily available or affordable in all industrial settings.
[0057] Training workers and technicians to handle such systems safely and effectively becomes an added burden on the implementing organization.
[0058] Thus, in light of the above-stated discussion, there exists a need for a low-cost industrial wastewater treatment system using ceramicware membrane technology.
SUMMARY OF THE DISCLOSURE
[0059] The following is a summary description of illustrative embodiments of the invention. It is provided as a preface to assist those skilled in the art to more rapidly assimilate the detailed design discussion which ensues and is not intended in any way to limit the scope of the claims which are appended hereto in order to particularly point out the invention.
[0060] According to illustrative embodiments, the present disclosure focuses on a low-cost industrial wastewater treatment system using ceramicware membrane technology which overcomes the above-mentioned disadvantages or provide the users with a useful or commercial choice.
[0061] An objective of the present disclosure is to develop an efficient industrial wastewater treatment system capable of removing both physical and chemical contaminants using ceramicware membrane technology.
[0062] Another objective of the present disclosure is to design a cost-effective filtration mechanism that primarily utilizes the gravitational potential energy of water, minimizing the need for external energy inputs.
[0063] Another objective of the present disclosure is to target wastewater effluents specifically from dye and leather industries, which are known for discharging high concentrations of pollutants.
[0064] Another objective of the present disclosure is to fabricate ceramicware membranes using locally available, inexpensive raw materials to ensure economic viability and ease of scalability.
[0065] Another objective of the present disclosure is to enhance the pollutant removal efficiency of ceramicware membranes by optimizing pore size and surface properties for industrial wastewater treatment.
[0066] Another objective of the present disclosure is to reduce the overall operational and maintenance costs of wastewater treatment facilities in small and medium-scale industries through gravity-fed membrane systems.
[0067] Another objective of the present disclosure is to develop a sustainable and eco-friendly wastewater treatment alternative that minimizes chemical usage and environmental impact.
[0068] Another objective of the present disclosure is to improve access to affordable wastewater treatment technologies for rural and under-resourced industrial regions.
[0069] Another objective of the present disclosure is to assess the long-term durability and reusability of ceramicware membranes in treating highly contaminated industrial wastewater.
[0070] Yet another objective of the present disclosure is to demonstrate the practical applicability and performance efficiency of the proposed system through real-time field implementation and data analysis.
[0071] In light of the above, a low-cost industrial wastewater treatment system using ceramicware membrane technology comprises a wastewater treatment tank having a base and a plurality of side walls. The system also includes a ceramicware membrane comprising porous ceramic plates fabricated from a mixture of clay and sawdust in approximately equal volumetric proportions. The system also includes a mesh support base positioned at the bottom of the treatment tank for supporting the ceramicware membrane matrix. The system also includes a silicone sealant applied between adjacent ceramic plates and along the interface between the ceramicware membrane and the side walls of the treatment tank to ensure leak-proof assembly. The system also includes a pair of elevated and non-elevated legs supporting the tank. The system also includes a sludge collector detachably mounted at the upper edge of the tank for periodic removal of accumulated residual sludge from the membrane surface.
[0072] In one embodiment, the ceramicware membrane comprises porous ceramic plates fabricated from a mixture of clay and sawdust in approximately equal volumetric proportions.
[0073] In one embodiment, the ceramicware membrane is supported on a mesh base positioned at the bottom of the treatment tank, the mesh base comprising metal strips arranged to provide structural stability and support to the ceramic plates during filtration.
[0074] In one embodiment, a silicone sealant is applied between adjacent ceramic plates and along the interface between the ceramicware membrane and the side walls of the treatment tank to prevent leakage and ensure a continuous membrane layer.
[0075] In one embodiment, the treatment tank is supported by a pair of elevated and non-elevated legs, the legs configured to impart a tilt to the tank to facilitate gravitational flow and directional collection of percolated water.
[0076] In one embodiment, the sludge collector is detachably mounted at the upper edge of the treatment tank using collars that enable easy removal and reinsertion.
[0077] In one embodiment, the fabrication of the ceramicware membrane includes forming a dough of the clay and sawdust mixture with water, shaping the dough using a hydraulic press to a defined thickness, followed by drying the greenware first in shaded conditions and then under direct sunlight.
[0078] In one embodiment, the ceramicware membrane possesses a partial negative surface charge that enables the electrostatic adsorption of positively charged metal ions present in industrial wastewater during treatment.
[0079] In one embodiment, the wastewater treatment system operates entirely through gravitational flow, without the need for external energy sources, thereby providing a cost-effective and sustainable solution for industrial effluent treatment.
[0080] In one embodiment, a method for a low-cost industrial wastewater treatment using ceramicware membrane technology, comprises collecting industrial wastewater that has undergone primary treatment and directing it into a treatment tank. The method also includes utilizing the gravitational potential of the wastewater to generate a hydrostatic pressure difference across the ceramicware membrane matrix. The method also includes fabricating the ceramicware membrane by preparing a composite mixture of locally available salty clayey soil and sawdust in approximately equal volume proportions, mixing with water to form a dough, shaping the dough into plates using a hydraulic press, drying the plates in shade followed by sun-drying, and subsequently firing the dried plates in a muffle furnace to obtain porous ceramicware membranes. The method also includes adsorbing chemical contaminants, including metal ions, onto the ceramicware membrane through the interaction between the porous ceramic surface and water. The method also includes trapping physical contaminants and residual sludge on the upper surface of the ceramicware membrane. The method also includes periodically removing the accumulated residual sludge using the sludge collector installed at the top of the tank to maintain membrane performance and facilitate metal recovery. The method also includes replacing the ceramicware membrane by detaching it from the base of the treatment tank and resealing the tank with a new membrane using silicone sealant.
[0081] These and other advantages will be apparent from the present application of the embodiments described herein.
[0082] The preceding is a simplified summary to provide an understanding of some embodiments of the present invention. This summary is neither an extensive nor exhaustive overview of the present invention and its various embodiments. The summary presents selected concepts of the embodiments of the present invention in a simplified form as an introduction to the more detailed description presented below. As will be appreciated, other embodiments of the present invention are possible utilizing, alone or in combination, one or more of the features set forth above or described in detail below.
[0083] These elements, together with the other aspects of the present disclosure and various features are pointed out with particularity in the claims annexed hereto and form a part of the present disclosure. For a better understanding of the present disclosure, its operating advantages, and the specified object attained by its uses, reference should be made to the accompanying drawings and descriptive matter in which there are illustrated exemplary embodiments of the present disclosure.
BRIEF DESCRIPTION OF THE DRAWINGS
[0084] To describe the technical solutions in the embodiments of the present disclosure or in the prior art more clearly, the following briefly describes the accompanying drawings required for describing the embodiments or the prior art. Apparently, the accompanying drawings in the following description merely show some embodiments of the present disclosure, and a person of ordinary skill in the art can derive other implementations from these accompanying drawings without creative efforts. All of the embodiments or the implementations shall fall within the protection scope of the present disclosure.
[0085] The advantages and features of the present disclosure will become better understood with reference to the following detailed description taken in conjunction with the accompanying drawing, in which:
[0086] FIG. 1 illustrates a flowchart outlining sequential step involved in a low-cost industrial wastewater treatment system using ceramicware membrane technology, in accordance with an exemplary embodiment of the present disclosure;
[0087] FIG. 2 illustrates a single ceramicware and a ceramicware connected through sealant, in accordance with an exemplary embodiment of the present disclosure;
[0088] FIG. 3 illustrates assembled ceramicware membrane-based treatment facility for industrial wastewater treatment, in accordance with an exemplary embodiment of the present disclosure.
[0089] Like reference, numerals refer to like parts throughout the description of several views of the drawing;
[0090] The low-cost industrial wastewater treatment system using ceramicware membrane technology, which like reference letters indicate corresponding parts in the various figures. It should be noted that the accompanying figure is intended to present illustrations of exemplary embodiments of the present disclosure. This figure is not intended to limit the scope of the present disclosure. It should also be noted that the accompanying figure is not necessarily drawn to scale.
DETAILED DESCRIPTION OF THE DISCLOSURE
[0091] The following is a detailed description of embodiments of the disclosure depicted in the accompanying drawings. The embodiments are in such detail as to communicate the disclosure. However, the amount of detail offered is not intended to limit the anticipated variations of embodiments; on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the present disclosure.
[0092] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the present disclosure. It may be apparent to one skilled in the art that embodiments of the present disclosure may be practiced without some of these specific details.
[0093] Various terms as used herein are shown below. To the extent a term is used, it should be given the broadest definition persons in the pertinent art have given that term as reflected in printed publications and issued patents at the time of filing.
[0094] The terms “a” and “an” herein do not denote a limitation of quantity, but rather denote the presence of at least one of the referenced items.
[0095] The terms “having”, “comprising”, “including”, and variations thereof signify the presence of a component.
[0096] Referring now to FIG. 1 to FIG. 3 to describe various exemplary embodiments of the present disclosure. FIG. 1 illustrates a flowchart outlining sequential step involved in a low-cost industrial wastewater treatment system using ceramicware membrane technology, in accordance with an exemplary embodiment of the present disclosure.
[0097] A low-cost industrial wastewater treatment system using ceramicware membrane technology 100 comprises a wastewater treatment tank 102 having a base and a plurality of side walls. The treatment tank 102 is supported by a pair of elevated and non-elevated legs, the legs configured to impart a tilt to the tank to facilitate gravitational flow and directional collection of percolated water. The wastewater treatment system operates entirely through gravitational flow, without the need for external energy sources, thereby providing a cost-effective and sustainable solution for industrial effluent treatment.
[0098] The system also includes ceramicware membrane 104 comprising porous ceramic plates fabricated from a mixture of clay and sawdust in approximately equal volumetric proportions. The ceramicware membrane 104 comprises porous ceramic plates fabricated from a mixture of clay and sawdust in approximately equal volumetric proportions. The ceramicware membrane 104 is supported on a mesh base positioned at the bottom of the treatment tank, the mesh base comprising metal strips arranged to provide structural stability and support to the ceramic plates during filtration. The fabrication of the ceramicware membrane 104 includes forming a dough of the clay and sawdust mixture with water, shaping the dough using a hydraulic press to a defined thickness, followed by drying the greenware first in shaded conditions and then under direct sunlight. The ceramicware membrane 104 possesses a partial negative surface charge that enables the electrostatic adsorption of positively charged metal ions present in industrial wastewater during treatment.
[0099] The system also includes a mesh support base 106 positioned at the bottom of the treatment tank for supporting the ceramicware membrane matrix.
[0100] The system also includes a silicone sealant 108 applied between adjacent ceramic plates and along the interface between the ceramicware membrane and the side walls of the treatment tank to ensure leak-proof assembly. A silicone sealant 108 is applied between adjacent ceramic plates and along the interface between the ceramicware membrane and the side walls of the treatment tank to prevent leakage and ensure a continuous membrane layer.
[0101] The system also includes a pair of elevated and non-elevated legs 110 supporting the tank.
[0102] The system also includes a sludge collector 112 detachably mounted at the upper edge of the tank for periodic removal of accumulated residual sludge from the membrane surface. The sludge collector 112 is detachably mounted at the upper edge of the treatment tank using collars that enable easy removal and reinsertion.
[0103] A method for a low-cost industrial wastewater treatment using ceramicware membrane technology, comprises collecting industrial wastewater that has undergone primary treatment and directing it into a treatment tank. The method also includes utilizing the gravitational potential of the wastewater to generate a hydrostatic pressure difference across the ceramicware membrane matrix. The method also includes fabricating the ceramicware membrane by preparing a composite mixture of locally available salty clayey soil and sawdust in approximately equal volume proportions, mixing with water to form a dough, shaping the dough into plates using a hydraulic press, drying the plates in shade followed by sun-drying, and subsequently firing the dried plates in a muffle furnace to obtain porous ceramicware membranes. The method also includes adsorbing chemical contaminants, including metal ions, onto the ceramicware membrane through the interaction between the porous ceramic surface and water. The method also includes trapping physical contaminants and residual sludge on the upper surface of the ceramicware membrane. The method also includes periodically removing the accumulated residual sludge using the sludge collector installed at the top of the tank to maintain membrane performance and facilitate metal recovery. The method also includes replacing the ceramicware membrane by detaching it from the base of the treatment tank and resealing the tank with a new membrane using silicone sealant.
[0104] FIG. 1 illustrates a flowchart outlining sequential step involved in a low-cost industrial wastewater treatment system using ceramicware membrane technology.
[0105] At 102, the process begins with the wastewater treatment tank, which serves as the primary containment and operational vessel for the entire system. The tank comprises four robust side walls and a base, usually fabricated from metal or high-strength polymeric material. Its function is to receive wastewater, house the ceramicware membrane structure, support hydrostatic filtration, and facilitate the separation of contaminants. The side walls are dimensioned to withstand the pressure of incoming effluent and to allow sufficient height for gravitational force to build up.
[0106] The size of the tank is determined based on the industrial facility’s discharge rate and the duration of treatment cycles. The rectangular or cylindrical configuration is typically chosen for ease of construction and structural stability. Within this tank lies the heart of the filtration mechanism—the ceramicware membrane matrix. The tank is elevated on legs, which are asymmetrically arranged to introduce a slight tilt, encouraging the natural flow of treated water toward a designated outlet or collection zone.
[0107] At 104, the filtration process depends heavily on the ceramicware membrane, which is engineered from a homogeneous mixture of clay and sawdust in approximately equal volumetric proportions. This material choice is inspired by both economic feasibility and environmental sustainability. Clay is readily available in most regions and provides the required malleability and heat-hardening characteristics. Sawdust, a byproduct of the woodworking industry, acts as a pore-forming agent. When burned out during high-temperature firing, it leaves behind a network of interconnected micro- and nano-sized pores, transforming the composite into a highly porous ceramic structure.
[0108] The preparation begins by mixing clay and sawdust with water to form a dough-like consistency. This mixture is then shaped using hydraulic pressing techniques to ensure uniform thickness and structure. Post-shaping, the greenware is dried in two phases: first in the shade for structural stabilization and then in sunlight for moisture removal. Finally, the dried plates undergo firing in a muffle furnace at around 950°C, which both hardens the material and burns out the sawdust, yielding a robust, porous membrane.
[0109] These ceramicware plates are subsequently assembled into a matrix at the base of the tank. They perform the dual function of mechanical filtration (blocking large particles) and chemical adsorption (removing dissolved metal ions), owing to the partial negative surface charge they exhibit upon interaction with water. This negative charge attracts positively charged contaminants like heavy metals, which are common in industrial effluents.
[0110] At 106, below the ceramicware membrane lies the mesh support base, which is critical for even distribution of pressure, load-bearing, and long-term structural stability. This mesh is fabricated using corrosion-resistant metal strips or other durable materials arranged in a crisscross or grid-like fashion. It is designed to elevate and support the ceramicware membrane while allowing the free flow of filtered water to the lower sections of the tank.
[0111] The mesh base also prevents sagging or rupture of the ceramic plates over prolonged usage. It ensures that hydrostatic pressure acts uniformly across the membrane surface, maintaining consistent filtration rates. In the event of excessive sludge buildup or mechanical stress, the mesh absorbs and distributes the load, preserving the integrity of the ceramicware and minimizing downtime.
[0112] At 108, to ensure that the system remains leak-proof and structurally cohesive, silicone sealant is used at two critical junctures. Firstly, it is applied between adjacent ceramic plates to form a continuous, monolithic membrane surface. Secondly, it is used along the interface between the ceramicware matrix and the side walls of the treatment tank, thereby eliminating any gaps that may allow untreated water to bypass the filtration layer.
[0113] Silicone sealant is chosen for its chemical inertness, flexibility, and high bonding capacity. It is resistant to the various chemical agents typically found in industrial wastewater and does not degrade or leach contaminants into the treated water. The sealant can also be easily removed and reapplied during maintenance or when replacing the ceramic plates, contributing to the system’s reusability and sustainability.
[0114] At 110, an ingenious feature of the system lies in its supporting leg configuration. The tank is mounted on four legs, two of which are marginally taller than the others. This subtle tilt establishes a hydrostatic gradient, causing the treated water to naturally move toward one end of the tank, where it can be collected or directed into a storage container.
[0115] This gradient also prevents stagnation within the membrane structure, ensures a self-cleaning effect, and reduces the risk of backflow or contamination. By eliminating the need for external pumps or electrical devices, this gravitational flow mechanism significantly reduces both operational costs and carbon footprint, aligning the system with the principles of green engineering and sustainable development.
[0116] At 112, during filtration, physical contaminants, such as suspended solids, silt, and biomass residues, accumulate on the top surface of the ceramicware membrane. Over time, this layer of residual sludge can impede filtration efficiency and must be removed. For this purpose, a sludge collector is installed at the top edge of the tank, secured using detachable collars or clamps.
[0117] This collector allows for easy and periodic removal of accumulated sludge without dismantling the entire system. Moreover, because the sludge often contains trapped heavy metals, it can be subjected to metal recovery techniques, contributing to resource conservation and waste minimization. The collected sludge can also be analyzed to monitor the contaminant profile of the industrial discharge and evaluate the system’s performance over time.
[0118] FIG. 2 illustrates a single ceramicware and a ceramicware connected through sealant.
[0119] FIG. 2A, shows a rectangular, reddish-brown block, which is a single ceramicware membrane unit. This unit is fabricated by blending salty clayey soil and organic sawdust in approximately equal volumetric proportions (typically 50:50). These raw materials are selected not only for their availability but for the roles they play in producing the unique porous structure of the final ceramic unit. The clay serves as the structural framework, while the sawdust acts as a burnout agent. During firing in a muffle furnace at a peak temperature of around 950°C, the sawdust combusts and escapes as gas, leaving behind a network of interconnected micro- and nano-scale pores. This pore architecture is critical because it allows water to pass through the ceramic matrix under hydrostatic pressure while retaining physical, chemical, and metallic contaminants.
[0120] The shape, color, and texture visible in the image indicate a typical fired ceramic body. The reddish hue is indicative of iron oxides present in the clay, while the smooth but visibly porous surface shows that the sintering temperature was carefully controlled to avoid vitrification, which would block the pores. The final structure is strong enough to sustain the vertical weight of incoming wastewater but porous enough to facilitate filtration, making it an ideal low-tech membrane.
[0121] Each unit is typically pressed to a uniform thickness using a hydraulic press and then dried in two phases: first under shade for a week to allow moisture to escape gradually, and then in sunlight to remove residual dampness. This phased drying prevents cracking, warping, or shrinkage that could compromise the membrane’s mechanical integrity. Following this, the greenware is fired, turning it into a structurally resilient and functionally porous ceramic plate.
[0122] FIG. 2B, represents the next stage of the system's construction — a 5×10 ceramicware matrix formed by assembling 50 individual units. These units are connected together using a silicone sealant, which is applied along all joining edges to form a leak-proof, continuous filtration layer at the bottom of the treatment tank. The sealant serves several purposes. Functionally, it prevents wastewater from bypassing the porous membrane by leaking through the seams between ceramic plates. Structurally, it holds the units in place even under the pressure exerted by standing water, sludge accumulation, and operational stresses.
[0123] The 5×10 arrangement implies a modular grid layout where 5 rows and 10 columns of ceramic units are fitted side by side. This large surface area significantly increases the system’s treatment capacity, allowing a greater volume of wastewater to be processed simultaneously. The matrix is supported on a metal mesh base within the treatment tank, which ensures uniform distribution of load and prevents sagging of the ceramicware. Each ceramic tile in this configuration plays a dual role: it acts as a filtration membrane and a contaminant adsorbent.
[0124] One of the unique characteristics of these ceramic units is their partial negative surface charge when in contact with water. This charge enables them to adsorb positively charged metal ions, such as those from lead, mercury, or cadmium compounds, making the ceramicware membrane an effective tool for removing heavy metal pollutants from industrial effluents. This adsorption is not only physical but involves weak electrostatic attractions that bind contaminants onto the ceramic surface, which can then be collected and possibly recovered.
[0125] Additionally, physical impurities and suspended solids are trapped on the top surface of the membrane as water percolates downward due to gravitational pressure. As more solids accumulate, they form a thin sludge layer, which can reduce flow rate over time. The system addresses this issue with a sludge collector attached to the top rim of the treatment tank. Periodic removal of this sludge ensures continuous flow and prevents clogging.
[0126] The importance of these ceramicware membranes extends beyond simple water filtration. They are a key enabler of decentralized, sustainable, and low-cost wastewater treatment, particularly for industries in rural or semi-urban settings where infrastructure is limited. By using no electricity, the system drastically reduces operational costs, making it ideal for small and medium enterprises. Moreover, the fabrication process is environmentally benign, as it recycles agricultural and earthen waste into functional materials, contributing to a circular economy.
[0127] When the membranes reach the end of their life cycle—either due to clogging or surface degradation—they can be safely removed by detaching the silicone sealant. Replacement is simple and requires minimal training, enabling even unskilled labor to manage the operation and maintenance. The used membranes, being made of natural materials, can be safely disposed of without posing environmental hazards, unlike synthetic polymer-based membranes.
[0128] In addition to water purification, the matrix design enhances system modularity and scalability. Depending on treatment needs, one can increase the size of the matrix (e.g., 6×12 or 10×10) or stack multiple layers in a multistage filtration tank to improve throughput and efficiency. This level of customization ensures that the system can be adapted for various industrial setups, from textile dyeing to food processing to electroplating facilities.
[0129] FIG. 3 illustrates assembled ceramicware membrane-based treatment facility for industrial wastewater treatment.
[0130] The figure offers a well-structured representation of a low-cost, decentralized ceramicware membrane-based treatment facility, designed specifically for industrial wastewater treatment applications. This facility integrates simple construction with passive operation, providing a sustainable alternative to high-energy-consuming wastewater treatment methods. Each component in the schematic—from the influent channel to the ceramic matrix and sludge collector—has been meticulously designed to support a self-sustaining, low-maintenance treatment process. The treatment system is particularly valuable in settings lacking advanced infrastructure or reliable power supply, such as rural industrial clusters or small-scale manufacturing units.
[0131] The treatment facility consists of a rectangular tank housing a ceramic matrix, through which industrial effluent passes. The inlet pipe labeled as “Effluent” is located at one end of the tank and allows contaminated water from the industry to enter the chamber. The water flows across and above the ceramic matrix laid horizontally at the base of the tank. As the effluent encounters this porous filtration layer, it begins its transformation—from a pollutant-laden liquid into a cleaner, safer output.
[0132] Positioned at the upper portion of the tank, near the outlet end, is a sludge collector. This unit, further highlighted by a zoomed-in view in the schematic, plays an essential role in ensuring uninterrupted filtration by capturing and channeling the solid residues and particulates that settle or accumulate due to the ceramic filtration action. The tank itself functions not only as a container but also as a passive pressure source. The hydrostatic head (i.e., the weight of the water column above the ceramicware) generates sufficient downward force to push the water through the membrane, thus avoiding any need for mechanical pumps or external power.
[0133] At the center of the system lies the ceramic matrix, constructed from multiple units of ceramicware membranes arranged in a modular configuration—typically 5×10 units as discussed in previous visuals. Each unit is made from a mixture of salty clayey soil and sawdust, molded, dried, and fired at approximately 950°C in a muffle furnace. This firing process causes the organic sawdust to burn away, leaving behind an intricate porous network that serves as the filtration pathway.
[0134] These ceramic units are strategically sealed together using a silicone-based sealant to prevent bypass leakage and to form a monolithic filtration floor. The sealant ensures structural integrity and watertight bonding, so the wastewater cannot slip through the joints and must pass through the ceramic pores. The matrix effectively traps suspended solids, dyes, heavy metals, and even microbial contaminants depending on the pore size distribution and surface chemistry of the ceramics.
[0135] The choice of ceramicware as the primary membrane medium is deliberate. Ceramics offer mechanical robustness, chemical inertness, and excellent thermal resistance. Unlike polymer membranes, they do not degrade under harsh chemical exposure—a common issue in industrial effluent containing acids, alkalis, solvents, or dyes. Moreover, ceramic membranes are regenerable and recyclable, contributing to their environmental and economic sustainability.
[0136] The working principle behind this system relies primarily on gravity-driven filtration and adsorptive interaction. As wastewater flows into the tank and settles over the ceramic matrix, gravitational potential pushes the water downward. The hydrostatic pressure is sufficient to initiate slow filtration without mechanical pumps.
[0137] The ceramicware membrane removes contaminants via three primary mechanisms; physical filtration – Suspended solids, particulate matter, fibers, and microplastic fragments are too large to pass through the micro/nano pores and are trapped on the top surface of the ceramic. Adsorption of dissolved contaminants – The clay composition and partial surface charge of the ceramic promote adsorption of positively charged metal ions (like lead, copper, and mercury), removing dissolved heavy metals. Some organic molecules may also be weakly adsorbed via van der Waals interactions. Depth filtration and retention – As water moves through the tortuous pores of the ceramic unit, smaller particles and microorganisms are further slowed or captured inside the matrix, providing multiple layers of filtration.
[0138] The output water, having passed through this multilayered porous barrier, is collected beneath the ceramic matrix—either passively or with help from a low-pressure draw-off point (if elevation-based flow is used).
[0139] An important aspect of long-term filtration performance is preventing membrane clogging. The sludge collector shown in the image is designed to intercept and extract accumulated solids and biomass that settle atop the ceramic membrane. As wastewater passes through the ceramic surface, rejected impurities form a concentrated sludge layer. If left unchecked, this layer could block the pores, slowing or halting filtration.
[0140] To address this, the system includes a sludge collection pipe, fitted at the top of the tank and sloped towards an accessible drainage outlet. Periodic manual or automatic removal of sludge ensures the surface of the ceramic remains exposed and functional. The sludge can then be dried, safely stored, or further processed depending on the nature of the contaminants.
[0141] This low-tech but effective approach to sludge removal is critical in maintaining system longevity and reducing downtime. It also allows non-expert users to manage the system with minimal training.
[0142] The tank serves as the physical framework housing all components. Typically constructed from corrosion-resistant metal or high-density polyethylene (HDPE), the tank is designed to be rectangular for uniform flow distribution. Elevated at a slight gradient to encourage effluent flow. Spacious enough to accommodate both matrix and sludge space.
[0143] The tank’s height directly impacts the hydrostatic pressure, thereby affecting the flow rate. For instance, a tank height of 1 meter can provide a pressure head of approximately 0.1 bar—sufficient for slow filtration in gravity-based systems.
[0144] The tank must also resist hydraulic and structural loads imposed by the weight of wastewater, ceramic tiles, and operational movement. Support legs or braces are included to ensure stability, particularly for outdoor installations subject to wind or uneven ground.
[0145] While the invention has been described in connection with what is presently considered to be the most practical and various embodiments, it will be understood that the invention is not to be limited to the disclosed embodiments, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the scope of the appended claims.
[0146] A person of ordinary skill in the art may be aware that, in combination with the examples described in the embodiments disclosed in this specification, units and algorithm steps may be implemented by electronic hardware, computer software, or a combination thereof.
[0147] The foregoing descriptions of specific embodiments of the present disclosure have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the present disclosure to the precise forms disclosed, and many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described to best explain the principles of the present disclosure and its practical application, and to thereby enable others skilled in the art to best utilize the present disclosure and various embodiments with various modifications as are suited to the particular use contemplated. It is understood that various omissions and substitutions of equivalents are contemplated as circumstances may suggest or render expedient, but such omissions and substitutions are intended to cover the application or implementation without departing from the scope of the present disclosure.
[0148] Disjunctive language such as the phrase “at least one of X, Y, Z,” unless specifically stated otherwise, is otherwise understood with the context as used in general to present that an item, term, etc., may be either X, Y, or Z, or any combination thereof (e.g., X, Y, and/or Z). Thus, such disjunctive language is not generally intended to, and should not, imply that certain embodiments require at least one of X, at least one of Y, or at least one of Z to each be present.
[0149] In a case that no conflict occurs, the embodiments in the present disclosure and the features in the embodiments may be mutually combined. The foregoing descriptions are merely specific implementations of the present disclosure, but are not intended to limit the protection scope of the present disclosure. Any variation or replacement readily figured out by a person skilled in the art within the technical scope disclosed in the present disclosure shall fall within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.
, Claims:I/We Claim:
1. A low-cost industrial wastewater treatment system using ceramicware membrane technology (100) comprising:
a wastewater treatment tank (102) having a base and a plurality of side walls;
a ceramicware membrane (104) comprising porous ceramic plates fabricated from a mixture of clay and sawdust in approximately equal volumetric proportions;
a mesh support base (106) positioned at the bottom of the treatment tank for supporting the ceramicware membrane matrix;
a silicone sealant (108) applied between adjacent ceramic plates and along the interface between the ceramicware membrane and the side walls of the treatment tank to ensure leak-proof assembly;
a pair of elevated and non-elevated legs (110) supporting the tank;
a sludge collector (112) detachably mounted at the upper edge of the tank for periodic removal of accumulated residual sludge from the membrane surface.
2. The system (100) as claimed in claim 1, wherein the ceramicware membrane 104 comprises porous ceramic plates fabricated from a mixture of clay and sawdust in approximately equal volumetric proportions.
3. The system (100) as claimed in claim 1, wherein the ceramicware membrane 104 is supported on a mesh base positioned at the bottom of the treatment tank, the mesh base comprising metal strips arranged to provide structural stability and support to the ceramic plates during filtration.
4. The system (100) as claimed in claim 1, wherein a silicone sealant 108 is applied between adjacent ceramic plates and along the interface between the ceramicware membrane and the side walls of the treatment tank to prevent leakage and ensure a continuous membrane layer.
5. The system (100) as claimed in claim 1, wherein the treatment tank 102 is supported by a pair of elevated and non-elevated legs, the legs configured to impart a tilt to the tank to facilitate gravitational flow and directional collection of percolated water.
6. The system (100) as claimed in claim 1, wherein the sludge collector 112 is detachably mounted at the upper edge of the treatment tank using collars that enable easy removal and reinsertion.
7. The system (100) as claimed in claim 1, wherein the fabrication of the ceramicware membrane 104 includes forming a dough of the clay and sawdust mixture with water, shaping the dough using a hydraulic press to a defined thickness, followed by drying the greenware first in shaded conditions and then under direct sunlight.
8. The system (100) as claimed in claim 1, wherein the ceramicware membrane 104 possesses a partial negative surface charge that enables the electrostatic adsorption of positively charged metal ions present in industrial wastewater during treatment.
9. The system (100) as claimed in claim 1, wherein the wastewater treatment system operates entirely through gravitational flow, without the need for external energy sources, thereby providing a cost-effective and sustainable solution for industrial effluent treatment.
10. A method for a low-cost industrial wastewater treatment using ceramicware membrane technology, comprising:
collecting industrial wastewater that has undergone primary treatment and directing it into a treatment tank;
utilizing the gravitational potential of the wastewater to generate a hydrostatic pressure difference across the ceramicware membrane matrix;
fabricating the ceramicware membrane by preparing a composite mixture of locally available salty clayey soil and sawdust in approximately equal volume proportions, mixing with water to form a dough, shaping the dough into plates using a hydraulic press, drying the plates in shade followed by sun-drying, and subsequently firing the dried plates in a muffle furnace to obtain porous ceramicware membranes;
adsorbing chemical contaminants, including metal ions, onto the ceramicware membrane through the interaction between the porous ceramic surface and water;
trapping physical contaminants and residual sludge on the upper surface of the ceramicware membrane;
periodically removing the accumulated residual sludge using the sludge collector installed at the top of the tank to maintain membrane performance and facilitate metal recovery;
replacing the ceramicware membrane by detaching it from the base of the treatment tank and resealing the tank with a new membrane using silicone sealant.