The present invention relates to a water purification device, a coagulating sedimentation apparatus and more specifically.
BACKGROUND
[0002]
　The coagulating sedimentation basin open to the atmosphere which has been used in conventional water purification facilities, when the treated water flowing there is water pressure, after temporarily stabilize the water flow in the reservoir well, chemicals mixing, flocculation , and a series of coagulating sedimentation processing such precipitation.
[0003]
　Further, in such aggregation sedimentation basin, precipitation sedimentation apparatus having an inclined plate or inclined tube was immersed in Ikeuchi, constitute a kind of multi-hierarchical sedimentation basin, a method of increasing the removal rate is known (e.g. Patent Document 1, non-Patent Document 1). As shown in FIG. 8, the inclination angle theta, by installing a device provided with a tilt member height H in sedimentation tank, sedimentation is to act as a h hierarchy min, resulting precipitate efficiency H / h times to increase. Such sedimentation device, by its shape, which is used in the horizontal flow, those used in the upward flow, but those used in either direction of the water flow exists, anyway, for the inclined member because that there is water flow is a condition of precipitation efficiency, means for producing such water was provided.
[0004]
　Further, in the latter stage of the settler, filtration device is provided, that the means for water to the filtration device is provided at present. Note that as such a water unit, the pump and difference in height is used.
CITATION
Patent Document
[0005]
Patent Document 1: JP 2007-21460 JP
Non-patent literature
[0006]
Non-Patent Document 1: Wet facility design guideline revision committee al., "Water supply facility design guideline", Japan Water Works Association issued Japan, March 31, 2000, pp. 194-199
Summary of the Invention
Problems that the Invention is to Solve
[0007]
　In view of the above situation, and simplify the configuration of the water treatment facilities, and to provide a means for improving the efficiency of the water purification system.
Means for Solving the Problems
[0008]
　To achieve the above object, the present invention employs the following configuration. I.e., having a possible pressure vessel maintaining the internal sealed the flowing liquid to be treated to a coagulating sedimentation processing apparatus to a predetermined pressure, is provided in the interior of the pressure vessel, and a precipitate separation portion comprising an inclined plate it is a coagulation-sedimentation equipment. By adopting such a configuration, coagulating sedimentation apparatus pressure of the treated water flowing can be obtained water flow towards the use and inclined plate, a pump, such as a height difference, the mechanism causing water flow omitted can do.
[0009]
　Thus, simplifying the coagulating sedimentation equipment, it is possible to save space, it is possible to streamline the entire water treatment system.
[0010]
　Further, the and the liquid to be treated is added flocculant, the said pressure vessel, a stirring portion for stirring the liquid to be treated, the floc forming unit to form flocs in the liquid to be treated said was stirred , it may have.
[0011]
　For coagulating sedimentation treatment, as a pre-step of the precipitation process, adding a flocculant to the treatment water, stirred and mixed water to be treated aggregating agent is added, agglomeration removal target substance in the water to be treated ( floc formation) needs to be. With such device configurations described above, treatment with such a stirring step and flocculation step also, it is possible to perform by utilizing water pressure water to be treated flows into the apparatus.
[0012]
　Further, the stirring unit, the pressure vessel may be a flow path arranged in a vertical direction in the center, the flocculation section, surround the stirring section, a wide flow path than the agitating portion it may be. With such a configuration, by utilizing the space in the pressure vessel efficiently, stirring unit, can be arranged floc portion, it is possible to secure the wide passage.
[0013]
　Further, the inclined plate may be arranged a plurality at equal intervals between the flocculation part and the inner wall of the pressure vessel. With such a structure, the precipitation process using an inclined plate can be performed without bias in the apparatus.
[0014]
　The plurality of the inclined plate, the radially disposed within the pressure vessel, and the side in contact with the inner wall of the pressure vessel of the inclined plate of the, the angle between the horizontal plane, may be 60 degrees or more.
[0015]
　As the inclination angle of the inclined plate with respect to the horizontal plane is small, it is possible to form many hierarchies within a predetermined height, while the precipitation efficiency increases, a possibility that sediment will be deposited on the upper surface of the inclined plate It occurs. In this respect, increasing the angle of inclination up to about 60 degrees, the precipitates settled is as slides down securely without depositing on the inclined plate. Therefore, the inclined plate of the apparatus in the configuration described above, while preventing the sediment deposited on the inclined plate, it is possible to improve the flocculation sedimentation efficiency of the device.
[0016]
　Further, the present invention can be grasped as the following water treatment system. That is, the a water treatment system comprising a flocculator apparatus and the filtration device, wherein the coagulating sedimentation apparatus pressure vessel, the pressure vessel, a stirring portion for stirring the liquid to be treated, the was stirred has a flocculation unit to form flocks in the process liquid, an inclined plate, wherein the filtering device comprises a pressure vessel, the pressure vessel has a filter medium, wherein the coagulating sedimentation apparatus and the filtration device are connected in series in a closed state, the coagulating sedimentation apparatus the treatment water which has flowed from the inlet is coagulating sedimentation processing and filtration process without being opened to the atmosphere, water toward the water purification pond or distribution reservoir from the filtration device is the fact characterized, water treatment system, it is.
The invention's effect
[0017]
　The present invention simplifies the construction of water purification facilities, it is possible to provide a means for improving the efficiency of the water purification system.
BRIEF DESCRIPTION OF THE DRAWINGS
[0018]
[1] Figure 1 is a side view illustrating an appearance of a coagulating sedimentation apparatus according to the first embodiment.
FIG. 2 is a diagram illustrating an internal configuration outline of coagulating sedimentation apparatus according to the first embodiment.
FIG. 3 is a schematic diagram illustrating the flow of water in the flocculator apparatus according to the first embodiment.
[4] Figure 4A is a plan view showing a tilt wing coagulating sedimentation apparatus according to the first embodiment, FIG. 4B is a perspective view showing a tilting wing coagulating sedimentation apparatus according to the first embodiment.
FIG. 5 is a diagram showing the internal configuration outline of coagulating sedimentation apparatus according to a modification of the first embodiment.
FIG. 6 is a schematic diagram showing a general water treatment system.
[7] FIG. 7 is a schematic view showing a water treatment system according to the second embodiment.
[8] FIG. 8 is an explanatory view showing the inclined plate, height, tilt angle, spacing, the relationship between the hierarchy level.
DESCRIPTION OF THE INVENTION
[0019]
　With reference to the drawings, the embodiments of the present invention will be exemplified in detail with reference to Examples. However, the dimensions of the components described in this embodiment, the material, shape, and relative arrangement, unless otherwise specified, are not intended to limit the scope of the invention.
[0020]
　
　(Overall Configuration of device)
　FIG. 1 is an appearance of a coagulating sedimentation apparatus 1 according to this embodiment, FIG. 2 shows the internal configuration of a coagulating sedimentation apparatus 1. Coagulating sedimentation apparatus 1 according to the present embodiment captures the treatment water to be processed in the apparatus, and coagulating sedimentation processing inside, water after treatment (hereinafter, also referred to as treated water) is discharged to outside the apparatus is a pressure vessel capable of maintaining internal to a predetermined pressure is sealed. Coagulating sedimentation apparatus 1, the lower portion of the cylindrical shape as shown in FIG. 1 has a housing 2 which has a conical shape, the treated water inlet 21 and the waste sludge outlet 23 at the bottom of the device, device top and a process water outlet 22. Although not shown, valves for each inflow outlet has a valve or the like of the air抜用. Also, coagulating sedimentation apparatus 1, as shown in FIG. 2, inside the stirring section 3, flocculation unit 4, precipitation separation unit 5, and a treated water outlet unit 6.
[0021]
　Figure 3 is a schematic diagram showing the flow of water in the coagulating sedimentation apparatus 1 according to the first embodiment. As shown in FIG. 3, is previously added coagulant, the water to be treated is taken into the device from the treated water inlet 21, the stirring section 3, flocculation unit 4, precipitation separation unit 5, the treated water outlet section 6 flow in order to flow out from the processing water outlet 22. Since coagulating sedimentation apparatus 1 is sealed pressure vessel, by using the water pressure of the treated water flowing into the apparatus, without using a water supply means such as a pump, the water after treatment device out ( for example, it is possible to water to the rear such process filtration device).
[0022]
　Stirring portion 3 has a cylindrical shape located in the heart of the coagulating sedimentation apparatus 1, the inner cylinder, screw blade around a cylinder is formed in a helical shape (hereinafter, referred to as in-line mixer 31) and fixedly installed along an axial direction. The in-line mixer 31, the water to be treated itself water flow passing through the stirring section 3 (i.e., without using other power), stirring of the water to be treated is performed aggregating agent is added. Here, in order to mix the flocculant with water to be treated is done properly, it is desirable that the flow rate of the water to be treated to pass through the stirring section 3 is somewhat higher rate (e.g., about every second 1 m). As shown in FIG. 3, so that the treated water flows over the stirring portion 3 from below, flows from the upper end of the stirring portion 3 in the flocculation unit 4.
[0023]
　Flocculation section 4 is a portion of a cylindrical shape disposed around the stirring portion 3, between the stirring portion 3 outer and flocculation unit 4 inside wall of the inner cylinder, periphrastic flow plate 41 in the axial direction along which a plurality of installation. Periphrastic flow plate 41, for example, shaped like cut away end of the outer periphery of the donut-shaped circular plate having a central circular space having the same diameter as the outer diameter of the stirring portion 3, a plurality of periphrastic Nagareban 41, the cutout portion, are arranged to be oppositely across the stirring portion 3. Treatment water flowing out from the agitation unit 3, the flocculation section flows down downward through the cutout portion of the 4, baffle wall 42 provided on the fourth lower flocculation unit while down along the upper surface of periphrastic flux plate 41, the water flow direction is adapted to flow out the precipitation separation unit 5 is adjusted. Thus the flow is blocked by the baffled channel plate 41, a slow rate (e.g., per second about 20 cm) that flows down while being stirred, the flocs are formed.
[0024]
　The precipitate separating unit 5, coagulating sedimentation apparatus 1 lower conical portion (Atsumaridoroshitsu 52) and the space between the outer wall of the flocculation part 4 and the housing 2 the inner wall of the flocculator device 1 (inclined blade portion 51) made, the inclined blade portion 51 is inclined blades 511 are installed to be described later. Before treatment water creates a flow directed from bottom to top the inclined blade portion 51, but of the flock in the for-treatment water which is formed by flocculation section 4, the relatively large ones, carried to the inclined blade portion 51 , we continue to settle towards the bottom of Atsumaridoroshitsu 52. Furthermore, while the water to be treated passes through the inclined blade portion 51, it continues to settle into fine flocs also to Atsumaridoroshitsu 52 bottom. Incidentally, mud deposited on Atsumaridoroshitsu 52 bottom (sludge) is discharged from the discharge mud outlet 23 to the outside of the apparatus through the waste sludge nozzle 521.
[0025]
　Then, the water to be treated passes through the sedimentation separation unit 5 is directed to the treated water outlet unit 6 is a space partitioned by the sparse flux plate 61, from the processing water outlet 22, and flows out to the outside of the apparatus. Sparse flow plate 61 is a circular plate-like member having a slightly smaller diameter than the diameter of the housing 2 flocculator apparatus 1, the center is to match the center of the coagulating sedimentation apparatus 1 is disposed horizontally ing. Therefore, a gap between the outer periphery and the inner wall of the housing 2 of the sparse flux plate 61, through the gap, the water to be treated passes through the sedimentation separation unit 5 flows into the treated water outlet unit 6.
[0026]
　Incidentally, coagulating sedimentation apparatus 1 according to this embodiment is an apparatus about the process water is per day 100 m3, the dimension of the main part of the above can be something like the following example. That is, the stirring portion 3 is diameter of about 50mm about in the center, flocculation unit 4 of about 400mm approximately located outside, more precipitate separation unit 5 located on the outside in order diameter 1200 mm, precipitation separation unit the height of the settler in 5 is about 890 mm.
[0027]
　(Inclination blades)
　will now be described in detail the structure of the inclined blade portion 51 and inclined blades 511. Inclined blade portion 51 cylindrically as a whole, in plan view has a toroidal shape, has become bore portion of the center, the configuration stirring portion 3 and the flocculation unit 4 is arranged. Then, the inclined wings 511 of a plurality (e.g., 40 sheets), are arranged at equal intervals radially about the center of the donut-shaped (i.e., the central axis of the coagulating sedimentation apparatus 1). The inclination blade 511 in this embodiment corresponds to the inclined plate.
[0028]
　4, 40 sheets of the inclined blades 511 (hereinafter, referred to as tilting blade group) is a diagram illustrating a. Figure 4A shows a state in a plan view of the tilting blade group, FIG. 4B shows a state viewed inclined blade group side from an oblique upper side. As shown in FIGS. 4A and 4B, the inclined wings are spread inner peripheral portion in a plan view from (i.e. the outer wall portion that contacts the flocculation part 4) radially on the outer periphery from the inner periphery side of the upper end and it extends horizontally straight toward. Accordingly, the at the inner circumferential portion outer peripheral portion (i.e. a portion in contact with the inner wall of the housing 2), the distance D of the inclined blades 511 and adjacent are different, for example, in the outer peripheral portion of about 94 mm, the inner peripheral portion it is about 31mm.
[0029]
　Further, as shown in FIG. 4B, the inclined wing the same height (e.g., about 815 mm) has, but with each inclination angle with respect to the circumferential direction, the angles outer peripheral portion and inner peripheral portion It is different between. In this embodiment, the angle of inclination wing 511 whereas the outer peripheral portion is 60 degrees, and 79 degrees in the inner circumferential portion. That is, the inclined blades 511 is not intended to be a flat plate of a mere rectangular diagonally, different lengths of the sides in contact with the side and the outer peripheral portion in contact with the inner periphery has a curve in the inner peripheral portion side and outer peripheral side at the time of deployment It is formed by a plate-like member (e.g., stainless steel plate).
[0030]
　The inclination angle of the inclined blade 511 is preferably set to 60 degrees or more. In this way, the precipitates settled on the upper surface of the inclined blades 511, slides down securely without deposition.
[0031]
　The configuration of the inclined blade group as described above, can be formed without gaps effective precipitation space the entire device. That is, even a space for performing a coagulation-sedimentation treatment a cylindrical shape, it can be arranged without waste inclined blades 511, effectively coagulating sedimentation process can be performed. This effect is not limited to the coagulating sedimentation apparatus 1 according to this embodiment is exerted similarly even when installing a tilt blade group to open sedimentation tank for example, cylindrical.
[0032]
　Each inclined blade may be being placed one by one on the inclined blade portion 51 but may be disposed one configured as an inclined blade groups module integrated. With such a modular like structure, for example, replacement of parts can be easily performed, burden of managing member is reduced, all of which are advantageous.
[0033]
　Next, the improvement of precipitation efficiency by inclined blades 511 will be described with reference to FIG. Figure 8 is an explanatory view showing the inclined plate, height, tilt angle, spacing, the relationship between the hierarchy level. As described above, in this embodiment, the inclination angle θ is 60 degrees of the outer peripheral portion of the inclined blade 511, since the interval D of the blade each other is about 94 mm, hierarchical height h is approximately 163 mm. Since the height H of the inclined blade 511 is about 815 mm, Dividing this value by 163 about 5, and the precipitate efficiency is about 5 times the case of not using the inclined blades 511.
[0034]
　In the present embodiment, a tilt angle θ is 79 degrees within the inclined blade 511 circumferential portion is larger than the outer peripheral portion, narrower than the distance D of about 31mm and the outer peripheral portion of the blade between the inner It improves substantially the same manner as precipitation efficiency and the outer peripheral portion even in the periphery. Specifically, the hierarchical height h is approximately 159mm, and the Dividing 815 by the value of about 5, and the precipitate efficiency is about 5 times the case of not using the inclined blades 511. Thus, the inclined blades 511 to be used for coagulating sedimentation apparatus 1 according to this embodiment, the inclination angle theta, inclined blades 511 spacing D between the relationship of height H, be expressed as D × tanθ × 5 ≦ H it can. That is, since it increases the inclination angle θ toward the inner periphery from the outer periphery of the inclined blades 511, the distance D between the inclined blades 511 is reduced in inverse proportion, the height H of the inclined blades 511 is constant, precipitation efficiency over the entire area of ​​the inclined blade 511 is approximately constant (about 5-fold, in this case).
[0035]
　In the present embodiment, the inclination angle of the inner peripheral portion inclined blades 511 theta is set to 79 degrees, this angle is one determined according to the diameter of the flocculation section 4 in the apparatus. The diameter of the flocs forming unit 4, because it is determined from the required capacity of the stirring portion 3 and the flocculation unit 4, the inclination angle of the inner peripheral portion inclined blades 511 may vary for each device according to a difference in the required capacity .
[0036]
　The construction of the coagulating sedimentation apparatus 1 as described so far, even in a narrow space, without requiring a power source, it is possible to provide a coagulating sedimentation means to exhibit excellent precipitation efficiency.
[0037]
　(Modification)
　Note that it is of course also possible to structure different from the first embodiment the configuration of the coagulating sedimentation apparatus 1. 5A, 5B and 5C is a diagram illustrating a modification of the coagulating sedimentation apparatus 1. Coagulating sedimentation apparatus 1 according to the present modification, since it has many common configurations and coagulating sedimentation apparatus 1 of the first embodiment, for such places, the same reference numerals, the detailed description is omitted to.
[0038]
　5A is a diagram showing an outline of the internal configuration of the coagulating sedimentation apparatus 1 according to this modified example, FIG. 5B is a plan view of a water collection plate 71 of the coagulating sedimentation apparatus 1 according to this modification. Figure 5A, as shown in FIG. 5B, coagulating sedimentation apparatus 1 according to this modification, in place of the sparse flux plate 61, water collecting plate 71 having the same diameter as the outer diameter of the inclined blade portion 51 is disposed . The Atsumarimizuban 71, water collecting hole 72 penetrating in the thickness direction, a plurality of equally spaced in the circumferential direction, and it is further provided in an arrangement such as to line up a plurality of rows in a radial direction, these collector treated water is adapted to flow into the treated water outlet unit 6 through the water holes 72.
[0039]
　With such a configuration, the treatment water is evenly distributed route passing through the precipitate separation unit 5, it is possible to enter quickly into without the treated water outlet portion 6 be bypassed, the overall device performance it is possible to prevent a decrease in.
[0040]
　Also, coagulating sedimentation apparatus 1 according to this modification, the lower portion of the inclined blade portion 51, and a five rectifying plate 73. 5C is a perspective view of five of the current plate 73. 5A and, as shown in FIG. 5C, the rectifying plate 73 is made by forming a plate member annularly, so that each different five rectifying plate 73 diameter, the coagulating sedimentation apparatus 1 coaxially It is located. Moreover, five of the current plate 73 is also different from each height, toward the outer periphery from the inner periphery of the device, are arranged in order from the lower.
[0041]
　By the action of such current plate 73, the treatment water flowing out from the flocculation unit 4 can be made to flow toward the smoother the inclined blade portion 51 upward.
[0042]
　
　Next, with reference to FIGS. 6 and 7, illustrating a second embodiment of the present invention. The second embodiment relates to a water treatment system, FIG. 6 is a diagram showing a conventional water purification system, FIG. 7 is a diagram showing a water treatment system according to this embodiment.
[0043]
　As shown in FIG. 6, in the conventional water purification system, a raw water intake by intake facility 81, which was pumped by such pump 90 to the reservoir well 82 in water treatment plants and temporarily stabilize the water flow in receiving well 82 above, the flocculant and the raw water rapidly agitated to mix with chemicals mixing basin 83, a raw water coagulant is mixed in flocculation basin 84 slow stirring to form a floc, with further sedimentation 85 the coagulation-sedimentation process has been performed. The treated water after coagulating sedimentation is water in the filtration basin 86 further by means such as a pump 90, where it is chlorinated in water purification basin 87 after being filtered, then each of distribution pipes 89 are stored in the distribution reservoir 88 is water distribution to users, it has become the trend of. Incidentally, it is also common practice to provide a height difference instead of the pump.
[0044]
　If it is more than such a system, different processing facilities for each process step (ponds) are required, also in sending to the subsequent step of water from each step, the pump, the water supply means such as a height difference because it requires the entire system becomes large, there is inefficiency surface.
[0045]
　The water treatment system 100 according to this embodiment shown in FIG. 7, a stirring unit in a pressure vessel, a flocculation section, a coagulating sedimentation apparatus 101 pressure type and a precipitate separation portion comprising an inclined plate, also pressure vessel by using the filtration device 102 for pressure type comprising a filter member within solves the above problems.
[0046]
　That is, in this embodiment, the raw water which is intake by intake facility 81, on the aggregating agent is added, is water in the coagulating sedimentation apparatus 101. Incidentally, coagulating sedimentation apparatus 101 is intended to have the same configuration as that described in Example 1, description thereof is omitted. Was treated with coagulation-sedimentation equipment 101 water is water to the filtration device 102 for pressure type without being directly opened to the atmosphere after being rapidly filtered through a filter media within the apparatus, water purification basin 87 (or directly distributing reservoir 88 ) is water supply to.
[0047]
　Flocculator device 101 and a pressure-type filtration device 102 is sealed, it leverages the primary pressure water to the flocculator 101 raw water from the water intake facility and water treatment water subsequent to each step since it is, it is possible to eliminate the need to separately take steps for the water supply. Further, since each device is sealed, it is not affected by the disturbance in each step in the apparatus. Furthermore, each device compact can be designed, it is possible to determine the installation place relatively freely.
[0048]
　Above, the water treatment system 100 as described, the water treatment facility can be designed in a space-saving, thereby improving the efficiency of the water treatment system.
[0049]
　
　In the above embodiments are only intended to illustrate the invention, the present invention is not limited to the specific embodiments described above. The present invention and various modifications are possible within the scope of its technical idea. For example, although the material of Example 1, the inclined blades were stainless steel plates, it may be used other metal plate, polypropylene, may be a resin such as polyvinyl chloride.
[0050]
　Further, in the above embodiment, the body shape of the coagulating sedimentation apparatus 1 is the lower portion of the cylindrical were those has a conical shape, not necessarily limited thereto, may be adopted other shapes. For example, it may be a conventional cylindrical shape and may be spherical or polygonal shape.
[0051]
　Further, in the above embodiment, the plurality of inclined blades were radially arranged with respect to the center of the circular cross-section. However, not limited to the above arrangement of the inclined blades. For example, if the body shape of the coagulating sedimentation apparatus 1 is polygonal shape, with respect to intersection of diagonal lines when viewed in plan the apparatus body, may be a plurality of inclined vanes are arranged radially. Further, a plurality of inclined vanes may be arranged radially with respect to the position other than the center of the cross section of the apparatus main body.
[0052]
　In the above second embodiment, may be used modules with integrated flocculator device (and the pressure-type filtration system) to multiple parallel. Thus, it is possible without being limited to processing capacity per single device, to construct a water treatment system having an arbitrary capacity.
DESCRIPTION OF SYMBOLS
[0053]
　1,101 ... flocculator device
　2 ... housing
　3 ... stirring part
　31 ... line mixer
　4 ... flocculation unit
　41 ... periphrastic flow plate
　42 ... rectifying wall
　5 ... - sedimentation separation unit
　511 ... inclined blades
　6 ... treated water outlet portion
　61 ... sparse flow plate
　71 ... Atsumarimizuban
　72 ... water collecting hole
　73 ... rectifying plate

WE claims

[Requested item 1]
　The inflowing liquid to be treated to a coagulating sedimentation processing apparatus
　and pressure vessel,
　provided inside the pressure vessel, a precipitation separation unit having an inclined plate
　flocculator apparatus having.
[Requested item 2]
　Wherein and the liquid to be treated is added flocculant,
　the said pressure vessel,
　a stirring portion for stirring the liquid to be treated,
　the floc forming unit to form flocs in the liquid to be treated said was stirred,
　the coagulating sedimentation apparatus according to claim 1 having.
[Requested item 3]
　The stirring unit, the a flow path arranged in a vertical direction into the pressure vessel center,
　said flocculation unit, a characterized in that the surround of the stirring portion, a wider flow path than the agitating portion to, coagulating sedimentation apparatus according to claim 2.
[Requested item 4]
　The inclined plate is characterized in that it is arranged a plurality at equal intervals between the flocculation part and the inner wall of the pressure vessel, coagulating sedimentation apparatus according to claim 2 or claim 3.
[Requested item 5]
　The plurality of the inclined plate, the radially disposed within the pressure vessel,
　and the side in contact with the inner wall of the pressure vessel of the inclined plate of the, the angle between the horizontal plane, characterized in that 60 degrees or more , coagulating sedimentation apparatus according to claim 4.
[Requested item 6]
　A water treatment system having a cohesive sedimentation device and the filtration device,
　wherein the coagulating sedimentation apparatus
　and the pressure vessel,
　the pressure vessel,
　　a stirring portion for stirring the liquid to be treated,
　　the liquid to be treated the was stirred a flocculation unit to form a floc,
　　comprising: a tilting plate, and
　the filtration device,
　a pressure vessel, the pressure vessel has a filter material,
　wherein in coagulating sedimentation apparatus and said filtering device is sealed continuously connected,
　the for-treatment water which has flowed from the inlet port of the coagulating sedimentation apparatus is coagulating sedimentation processing and filtration process without being opened to the atmosphere, are water toward the water purification pond or distribution reservoir from said filtration device characterized in that, water treatment system.