0001]The present invention is a water treatment system and a water treatment method.
BACKGROUND
[0002]Desalination and seawater, in the process water generated with the treatment of industrial wastewater, contains salt and other inorganic components. In discharging such treated water to the outside, to reduce the impact on the environment, the process of removing the components is performed. More specifically, in the desalination of sea water, to remove the salt and other minerals from the sea, the permeate as fresh water is obtained. Further, in the treatment of industrial waste water, by concentrating the salt or other inorganic substances, the waste water is volume reduction. Such processing performing unit, for example, RO membrane (Reverse Osmosis Membrane: reverse osmosis membrane) which were used are known in the art. RO membranes by use of the water to be treated is separated into permeated water and concentrated water containing the above components. Concentrate, permeate is processed in the apparatus either separately provided.
[0003]
　Incidentally, or when using RO membranes for a long time, if the resulting density variation in the water to be treated by organic substances such as microorganisms contained in the impurities adhering to the RO membrane surface, bio-like "slime" there are cases where the film is formed. If the biofilm is formed, it becomes impossible to maintain the performance of the RO membranes. A technique capable of suppressing the formation of such biofilms has been desired.
[0004]
　An example of such a technique is known one described in Patent Document 1. Patent Document 1 describes a reverse osmosis membrane filtration plant. In this plant, the biofilm formation base material having a reverse osmosis membrane, circulating the concentrated water guided from the downstream side of the reverse osmosis membrane module. By periodically evaluated by the amount of biofilm on the surface of the biofilm formation base material, the operating conditions of the plant are controlled.
CITATION
Patent Document
[0005]
Patent Document 1: Japanese Patent No. 5600864
Summary of the Invention
Problems that the Invention is to Solve
[0006]
　On the other hand, in the apparatus using a reverse osmosis membrane as described above, in addition to biofilm from organic matter and microorganisms, by ion components contained in the concentrated water crystallizes, is scale on the surface of the reverse osmosis membrane there is a case to be deposited. However, in the apparatus described in Patent Document 1 is only controlled in accordance with the occurrence or non-occurrence of biofilm is made, control according to the deposition of scale is not considered. Thus, it may not accurately perform a control of the apparatus.
[0007]
　The present invention was made to solve the above problems, and an object thereof is to provide a more precise control is available water treatment systems, and water treatment method.
Means for Solving the Problems
[0008]
　Water treatment system according to the first aspect of the present invention, a pretreatment apparatus for generating a primary treatment water by applying a preprocessing with respect to the for-treatment water, by the primary treated water is passed through, concentrated a membrane separation apparatus having a reverse osmosis membrane to separate the water and the permeate water, provided between the pretreatment device and the membrane separation device, first detecting the presence or absence of biofouling caused by the primary treatment water a first sensor unit, provided downstream of the membrane separation device, a second sensor device for detecting the presence or absence of scale deposition by the concentrated water, the presence or absence of the biofouling occurs, and based on the presence of the scale deposits , and a control device for determining the operating parameters including the supply pressure, and flow rate of the primary treated water to said membrane separator.
[0009]
　According to this configuration, the control device determines the presence or absence of biofouling caused by primary treated water, based on the presence or absence of scale deposition by concentrated water supply pressure of the primary treated water to the membrane separation apparatus, and the supply flow rate to. Thus, for example, it can be compared with the case of determining the parameter based on only the characteristic values ​​of the primary treated water, more precisely adjust the processing capabilities of the membrane separator.
[0010]
　According to a second aspect of the present invention, in a water treatment system according to the first embodiment, the pressure regulating valve to vary the supply pressure of the primary treated water into the membrane separation device, the supply of the primary treated water comprising a pump for varying the flow rate, wherein the control device, the presence or absence of biofouling occurs, and based on the presence of the scale deposits, varying the opening degree of the pressure regulating valve, and the discharge amount of the pump it is, it may adjust the operating parameters.
[0011]
　According to this configuration, based on the presence or absence of presence and scale deposits of biofouling occurs, only by changing the discharge amount of the opening and the pump of the pressure adjustment valve, easily adjust the processing capabilities of the membrane separator can do.
[0012]
　According to a third aspect of the present invention, the water treatment method, the pre-processing step of generating a primary treatment water by applying a preprocessing with respect to the treatment water, the primary treated water with respect to the reverse osmosis membrane by transmitting, the detecting and separating step of separating the the concentrated water and permeated water, a first obtaining step for detecting the presence or absence of biofouling generated by the primary treated water, the presence or absence of scale deposition by the concentrated water a secondary acquisition step, whether the biofouling occurs, and based on the presence of the scale deposits, including the pretreatment step, and a parameter determining step of determining the operating parameters of the separation step.
[0013]
　According to this method, the characteristic value of the primary treated water, based on the characteristic value of the concentrated water, the supply pressure of the primary treated water, and the supply flow rate is determined. Thus, for example, it can be compared with the case of determining the parameter based on only the characteristic values ​​of the primary treated water, more precisely adjust the processing capabilities of the membrane separator in the separation step.
Effect of the invention
[0014]
　According to the present invention can provide a more precise control is available water treatment systems, and waste water treatment method.
BRIEF DESCRIPTION OF THE DRAWINGS
[0015]
It is an overall view of a water treatment system according to the embodiment of FIG. 1 the present invention.
Is a flow chart showing the steps of the water treatment method according to an embodiment of the present invention; FIG.
3 is a diagram showing a process flow of the control device according to an embodiment of the present invention.
DESCRIPTION OF THE INVENTION
[0016]
　Embodiments of the present invention will be described with reference to FIGS. As shown in FIG. 1, the water treatment system 100 includes a pretreatment device 1, a membrane separation unit 2, a first sensor unit 3, and a second sensor unit 4, a controller 5, a.
[0017]
　The water treatment system 100 is used to generate fresh water, for example with respect to the water to be treated, such as seawater desalting process. Pretreatment device 1 includes an oxidation processing unit 11, a silica processing unit 12, a flocculation unit 13, a filtering unit 14, and a sterilization unit 15, the. The water to be treated, each of these devices through the above order.
[0018]
　Oxidation treatment unit 11 is a device for removing heavy metals contained in the water to be treated. In this oxidation treatment unit 11, the oxidizing agent is supplied to the water to be treated. Thereby, heavy metals in the for-treatment water is precipitated in the liquid as metal oxides. Treated water oxidation process is performed (oxidized water) is sent to the subsequent silica treatment unit 12.
[0019]
　Silica processing unit 12 is a device for removing silica (silica ions) contained in the oxidation treatment in water. This silica removal unit, suitable pharmaceutical water to be treated which is the oxidized (silica treatment agent) is supplied is appropriately selected. Thus, silica oxide treated water precipitates in the liquid as a silicon compound. Oxidation treated water silica treatment has been performed (silica treated water) is sent to the subsequent flocculation unit 13.
[0020]
　Flocculation unit 13 is a device for causing aggregation and precipitation of the metal oxide or silicon compound included in the silica treated water. In the flocculation unit 13, flocculant is supplied to the silica treated water. Thus, the metal oxides silica treated water, and a silicon compound, after aggregation, precipitation. Thus, the precipitation treatment water. Precipitation treatment water is sent to the subsequent filtration unit 14.
[0021]
　Filtration unit 14, the above precipitate contained in the precipitation treatment water (metal oxide or silicon compound aggregated) is filtered, the filtered water is produced. Filtered water is sent to the subsequent sterilization section 15.
[0022]
　Sterilizing unit 15 is a device for removing microbes (fungi) or the like contained in the filtered water. The sterilizing unit 15 for filtered water, disinfectant for removing these microorganisms are supplied. Thus, microorganisms contained in the filtered water is generally dying, primary treatment water W1 is generated. Incidentally, in the primary treated water in W1 in this phase, salt and, as inorganic such as an ion component which is not removed in the previous step it is still contained. Primary treatment water W1 is through the primary treated water line L1, is sent to the subsequent membrane separation apparatus 2.
[0023]
　Incidentally, the oxidation treatment unit 11 described above, the silica processing unit 12, flocculation unit 13 and the sterilization section 15, is connected to the control device 5 will be described later. In other words, oxidizing agents, silica processing agent supply amount of the aggregating agent, and fungicides is adjusted by the control device 5.
[0024]
　Membrane separation device 2 includes a plurality of vessel 21 having a reverse osmosis membrane, a pump 22, and a pressure regulating valve 23, the. For these vessel 21, by transmitting the primary treatment water W1 described above, the concentrated water containing salt, and permeate (fresh water) are generated. Of these, concentrated water is sent to the other device through concentrated water line L2 (not shown). Permeate through the permeate line L3, fed similarly to the concentrated water to other devices (not shown).
[0025]
　Pump 22 is provided on the upstream side of the vessel 21, the pressure regulating valve 23 is provided downstream. Supply pressure of the primary treated water W1 for the vessel 21 is adjusted by these pumps 22, and the pressure regulating valve 23. That is, the discharge amount of the pump 22, by varying each and opening of the pressure regulating valve 23, the supply pressure of the primary treated water W1 is adjusted. These pumps 22, the pressure regulating valve 23 is controlled by a control unit 5 which will be described later. Such adjustments, the recovery rate of the permeated water discharged from the membrane separation unit 2 (water recovery) is changed.
[0026]
　The first sensor unit 3 is provided in the primary treated water line on L1 (i.e., the region between the pretreatment device 1 and the membrane separation unit 2). The first sensor device 3 is a device for detecting the presence or absence of biofouling occurs in the primary treated water W1. Specifically, the first sensor unit 3, MFS (Membrane Fouling Simulator) is preferably used. MFS includes a reverse osmosis membrane system for a small called MFS flow cell therein.
[0027]
　For MFS, primary treatment water W1 is, constant flow rate, is supplied under a constant pressure. At this time, the pressure difference before and after the MFS flow cell occurs. Furthermore, when the biofouling occurs MFS flow cell by a primary treatment water W1 is changed to the pressure difference between before and after the MFS flow cell occurs. Specifically, when the biofouling has occurred, the pressure difference of the increase. This By detecting the change in the pressure difference, occurrence of biofouling by the primary treatment water W1 is detected. Presence of the thus detected biofouling occurs is transmitted as electrical signals to the controller 5 described later.
[0028]
　The second sensor unit 4 is provided above the concentrated water line L2 (i.e., the downstream side of the membrane separation device 2). In the first sensor unit 3, while the occurrence of biofouling by the primary treatment water W1 is detected, the second sensor unit 4, opposite that occurs from the ion species crystallization contained concentrate water the presence or absence of scale deposits on the osmosis membrane is obtained. Presence or absence of the scale deposition is sent as an electrical signal to the controller 5 described later.
[0029]
　Control unit 5, based on the presence or absence of scale deposits obtained whether biofouling occurs acquired by the first sensor unit 3 described above, and by the second sensor unit 4, a pre-processing apparatus 1 described above, film It controls the separator 2. Specifically, the control unit 5, the first sensor unit 3, and whether input and output unit 51 for inputting and outputting electrical signals, the input electrical signal (biofouling between the second sensor device 4 , and are provided based on the presence or absence of scale deposition), and the control device main body 52 for generating a pre-processing apparatus 1 and the membrane separation device 2 a control signal for controlling the operation parameter, a.
[0030]
　Next, it will be described with reference to FIG. 2 above operation of the water treatment system 100 (waste water treatment method). First, the pretreatment device 1 described above, the water to be treated is introduced. The pretreatment device 1, for the water to be treated, the process (oxidation process, silica treatment, coagulation and precipitation, filtration, and sterilization) is performed (pre-processing step S1). Accordingly, primary treated water W1 is generated.
[0031]
　Next, primary treatment water W1 is through the primary treated water line L1, is sent to the subsequent membrane separation apparatus 2. In the membrane separation apparatus 2, the reverse osmosis membrane, primary treatment water W1 is separated into permeated water and concentrated water (separation step S2). Concentrate, permeate are all other devices, it is sent to the equipment (not shown).
[0032]
　Here, and if continued for a long time operation as described above, if the variation in the quality of the water to be treated has occurred, the membrane separation apparatus 2, there is a case where the above-mentioned bio-fouling or scale deposits may occur. When biofouling and scale occurs, causing a reverse osmosis membrane clogging in the membrane separating device 2, the processing performance (the amount of permeated water) may be reduced. Therefore, the water treatment system 100 according to this embodiment, and detects the presence or absence of biofouling occurs in the primary treatment water W1 by the first sensor unit 3 described above, the presence or absence of scale deposition in the concentrated water by a second sensor device 4 detects the (first acquisition step S3, the second acquisition step S4). It is to be noted that the first acquisition step S3 may be performed prior to the separation step S2.
[0033]
　In the control unit 5, based on the presence or absence of existence and scale deposition of these biofouling occurs, before operating parameters of the processing apparatus 1 and the membrane separation device 2 is determined (parameter decision step S5). The operation of the control device 5 will be described with reference to FIG.
　First, the control unit 5, the presence or absence of biofouling occurs in the above-described MFS (first sensor unit 3) is inputted as an electric signal to the controller 5. If biofouling occurs on the first sensor unit 3 (i.e., if biofouling amount becomes greater than 0), primary treatment water W1 may be seen to be easily state biofouling occurs. Accordingly, the control unit 5, in response to the presence or absence of biofouling occurs first, before each drug in the processing apparatus 1 (oxidizing agent, silica treatment agents, flocculants, and fungicides) adjusted to microorganisms and organics supply amount of to reduce the amount of. Thus, to reduce the occurrence ease of biofouling in the primary treated water W1.
[0034]
　Further, the control unit 5 adjusts a discharge amount of the pump 22 in the membrane separation unit 2, by changing the opening degree of the pressure regulating valve 23, the water recovery rate in the membrane separation apparatus 2. Specifically, when the biofouling is determined likely to occur in the direction of lowering the water recovery rate controls the pump 22 and the pressure regulating valve 23.
[0035]
　Further, the control unit 5, the presence or absence of scale deposition in the second sensor unit 4 described above is input to the control device 5. When deposited scale in the second sensor unit 4 (i.e., when the scale deposition amount becomes greater than 0), it can be seen that the concentrated water is in a state easy to deposit scale. Accordingly, the control unit 5, in response to the presence or absence of scale deposits, each agent in the pretreatment device 1 (oxidizing agent, silica treatment agents, flocculants) by adjusting the supply amount of the amount of inorganic in the primary treated water W1 reduction to.
[0036]
　Further, the control unit 5 adjusts a discharge amount of the pump 22 in the membrane separation unit 2, by changing the opening degree of the pressure regulating valve 23, the water recovery rate in the membrane separation apparatus 2. Specifically, when the scale is determined to easily precipitated, for lowering the water recovery rate controls the pump 22 and the pressure regulating valve 23.
[0037]
　As described above, the control unit 5, the characteristic values ​​of the primary treated water W1 and (the presence or absence of biofouling occurs), based on the characteristic value of the concentrated water (presence or absence of scale deposition), the primary treatment water W1 supply pressure, and determines the supply flow rate. Thus, for example, can be compared with the case of determining the parameters, more precisely adjust the processing capabilities of the membrane separation device 2 on the basis of only the characteristic values ​​of the primary treated water W1.
[0038]
　Further, according to the above configuration, based on the presence or absence of the presence and scale deposits of biofouling occurs, only by changing the discharge amount of the opening and the pump 22 of the pressure regulating valve 23, the membrane separation apparatus 2 it is possible to easily adjust the processing capabilities.
[0039]
　In addition, according to the above configuration, presence or absence of scale deposition in the reverse osmosis membrane is used as input to the control unit 5. That is, the supply pressure of the primary treated water W1 based on the deposition of scale, and since the operating parameters comprising the supply flow rate is determined, to operate the membrane separation device 2 under a capacity enough to scale does not precipitate can.
[0040]
　Have been described embodiments of the present invention. The structure of the is merely an example, without departing from the gist of the present invention, it is possible to add various changes.
　For example, in the above embodiment, as the first sensor unit 3 has been described example using the MFS. However, the first sensor unit 3 is not limited to the MFS. That is, the first sensor unit 3, as long as capable of detecting the occurrence ease of biofouling, it is possible to use various devices. Similarly, the second sensor unit 4, as long as capable of detecting the scale deposits ease, it is possible to use various devices.
[0041]
　Furthermore, it is also possible to provide the presence or absence of biofouling occurs which is detected by the first sensor unit 3, and the priority to the existence of scale deposit which is detected by the second sensor device. For example, if you want to focus suppress the precipitation of scale than occurs in biofouling is possible to control the membrane separation device 2 on the basis of only the scale deposition is detected by the second sensor device 4 . Conversely, if you want to focus suppress the occurrence of biofouling than deposition of scale it is possible to control the membrane separation apparatus 2 based on only biofouling occurs which is detected by the first sensor device 3 possible it is.
DESCRIPTION OF SYMBOLS
[0042]
100 ... water treatment system
1 ... pretreatment device
2 ... membrane separator
3 ... first sensor unit
4 ... second sensor device
5 ... controller
11 ... oxidation processing unit
12 ... Silica processing unit
13 ... flocculation unit
14 ... filtering unit
15 ... sterilizer
21 ... vessel
22 ... pump
23 ... pressure control valve
51 ... input-output unit
52 ... controller body
S1 ... preprocessing step
S2 ... separation step
S3 ... first acquisition step
S4 ... second acquisition step
S5 ... parameter determination step
L1 ... primary treatment water line
L2 ... concentrated water line
L3 ... permeate line
W1 ... primary treated water

WE CLAIM

A pretreatment apparatus for generating a primary treatment water by applying a preprocessing with respect to the for-treatment water,
　by the primary treated water is passed through a membrane having a reverse osmosis membrane to separate the concentrated water and permeated water a separation device,
　provided between the pretreatment device and the membrane separation device, a first sensor device for detecting the presence or absence of biofouling generated by the primary treated water,
　located downstream of the membrane separation device is, a second sensor device for detecting the presence or absence of scale deposition by the concentrated water,
　the bio whether fouling occurs, and based on the presence of the scale deposits, the supply pressure of the primary treated water to said membrane separator, and a control device, which determines the operating parameters including the supply flow rate
water treatment system comprising a.
[Requested item 2]
　A pressure regulating valve to vary the supply pressure of the primary treated water into the membrane separation device,
　a pump for varying the flow rate of the primary treated water,
comprising a
　said control device, the presence or absence of the biofouling occurs, and on the basis of the presence or absence of scale deposition, the opening degree of the pressure regulating valve, and by changing the discharge amount of the pump, the water treatment system of claim 1 for adjusting the operating parameters.
[Requested item 3]
　A pretreatment step of generating a primary treatment water by applying a preprocessing with respect to the for-treatment water,
　by transmitting the primary treated water with respect to the reverse osmosis membrane, the separation step of separating the the concentrated water and permeated water When,
　a first obtaining step for detecting the presence or absence of biofouling generated by the primary treated water,
　and a second acquisition step for detecting the presence or absence of scale deposition by the concentrated water,
　the presence or absence of the biofouling occurs, and the scale based on the presence or absence of precipitation, a parameter determining step of determining the operating parameters in the preprocessing step, and the separation step
the water treatment method comprising.