JP3984145B2 - Cleaning method for solid-liquid separator - Google Patents

Cleaning method for solid-liquid separator Download PDF

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Publication number
JP3984145B2
JP3984145B2 JP2002307217A JP2002307217A JP3984145B2 JP 3984145 B2 JP3984145 B2 JP 3984145B2 JP 2002307217 A JP2002307217 A JP 2002307217A JP 2002307217 A JP2002307217 A JP 2002307217A JP 3984145 B2 JP3984145 B2 JP 3984145B2
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Japan
Prior art keywords
water
raw water
membrane
membrane unit
tank
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Expired - Fee Related
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JP2002307217A
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Japanese (ja)
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JP2004141724A (en
Inventor
正章 吉野
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前澤工業株式会社
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Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for cleaning solid-liquid separation equipment, particularly, flat membrane type, hollow fiber type, a spiral type, and other membrane module, a solid-liquid in a state in which the raw water is immersed in the filtration tank to be supplied separation to a method of cleaning definitive membrane module for solid-liquid separation equipment to perform.
[0002]
[Prior art]
In recent years, confluence improvement technology has attracted attention. In particular, there is an urgent need to improve water quality during rainy weather, such as the oil ball problem in Tokyo Bay. In the future, it will be necessary to remove BOD and SS during rainy weather. On the other hand, with the advanced treatment of sewage, it is necessary to increase MLSS depending on the treatment method, and there is a concern that the quality of secondary treated water may deteriorate due to a decrease in solid-liquid separation ability in the final sedimentation basin of the sewage treatment plant. Under such circumstances, a system that uses a solid-liquid separation membrane for solid-liquid separation processing has attracted attention.
[0003]
When using a solid-liquid separation membrane, how to efficiently perform washing and regeneration is an important issue in constructing a separation membrane utilization system. In particular, when the raw water for treatment is severely contaminated, the solid-liquid separation membrane is likely to be clogged, and the above problem becomes more conspicuous from the viewpoint of maintenance.
[0004]
Conventionally, as a method for cleaning and regenerating a solid-liquid separation membrane, methods such as reverse flow of water or air from the suction side of the separation membrane or physical membrane cleaning by air scrubbing are widely used. Furthermore, it has also been proposed to wash and regenerate the solid-liquid separation membrane by ejecting washing water toward the membrane surface (filtration surface) of the separation membrane (see, for example, Patent Document 1).
[0005]
[Patent Document 1]
JP 2000-62833 A (page 2-3, Fig. 1-3)
[0006]
[Problems to be solved by the invention]
However, the conventional cleaning and regeneration methods require pumps, blowers, dedicated piping, etc., and incidental facilities tend to be excessive, and there is room for improvement in terms of simplification and efficiency of the system. Moreover, since a part of filtration process water is used for washing | cleaning, a water recovery rate will also fall.
[0007]
The present invention, minimizing the additional equipment, and has an object to provide an effective film solid-liquid separation equipment cleaning method capable of cleaning without reducing the filtration capacity.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the method for cleaning a solid-liquid separator of the present invention is a raw water inflow portion in a filtration tank in which a membrane unit that performs solid-liquid separation by a plurality of membrane modules arranged with a membrane surface in a vertical direction is immersed. Of the solid-liquid separator that flows in the raw water from the flow path, causes the filtered water that has permeated the membrane unit to flow out from the filtered water outflow portion, and discharges the sludge in the filtration tank separated by the membrane unit from the sludge discharge portion. In the cleaning method, a raw water storage tank for storing raw water is installed at a position above the membrane unit in the previous stage of the filtration tank, and the raw water inlet valve and the raw water storage tank are connected to the raw water inflow valve. connect the water inlet pipe with said detecting a water level of the raw water storage tank, when the detected water level has reached the washing water level previously set, the water inlet and close the water inlet valve of the water inlet pipe After stopping the inflow of raw water into the filtration tank, the sludge in the filtration tank is discharged from the sludge discharge section together with the water in the filtration tank, and the raw water is exposed in the state where the membrane unit is exposed on the water surface. The raw water is introduced from the inflow part to the whole membrane unit through the raw water guide part for guiding the raw water, and the surface of the membrane module is washed. Thereby, cleaning operation can be effectively performed according to the clogged state of the membrane unit .
[0010]
Further, in the above-described cleaning method, a filtered water storage tank that stores filtered water is installed at a position above the membrane unit at a subsequent stage of the filtration tank, and the filtered water stored in the filtered water storage tank is filtered. It is formed so as to be able to flow backward from the water outflow part toward the membrane unit, and the sludge in the filtration tank is discharged from the sludge discharge part together with the water in the filtration tank, and the filtered water stored in the filtrate storage tank is The membrane unit is back-flushed from the filtered water outflow portion and back-washed, and then the membrane unit is exposed on the water surface. Thus, when the filtrate storage tank is installed in the latter stage of the filtration tank, after stopping the inflow of the raw water from the raw water inflow portion to the filtration tank, the sludge in the filtration tank is combined with the water in the filtration tank. The drainage of the membrane unit can be performed without power by discharging the filtrated water from the discharger and backflowing the filtrated water stored in the filtrated water storage tank from the filtrated water outlet to the membrane unit. In addition, when installing the said raw | natural water storage tank of a filtration tank front stage and the said filtration water storage tank of a filtration tank back | latter stage simultaneously, this filtrate water storage tank is arrange | positioned in the downward position from the said raw water storage tank.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a system diagram showing an embodiment in which a solid-liquid separator for carrying out the cleaning method of the present invention is applied to a water treatment facility using an activated sludge method. The solid-liquid separator 11 includes a filtration tank 13 in which the membrane unit 12 is housed, a raw water storage tank 14 provided in the front stage of the filtration tank 13, and a filtered water storage tank 15 provided in the subsequent stage of the filtration tank 13. The raw water inflow part of the filtration tank 13 and the bottom of the raw water storage tank 14 are connected by a raw water inflow pipe 16 provided with a raw water inflow valve 16a, and the filtered water outflow part of the filtration tank 13 and the filtered water storage tank 15 are connected. The backwash water reservoir 15a is connected by a filtered water outflow pipe 17 having a siphon function. Further, at the bottom of the filtration tank 13, a sludge pipe 18 having a sludge valve 18 a as a sludge discharge part for discharging sludge from the filter tank 13 is provided. Is provided.
[0015]
The height difference between the membrane unit 12, the raw water storage tank 14 and the filtered water storage tank 15 in the filtration tank 13 is set according to the pressure loss in the membrane unit 12, and the water level in the raw water storage tank 14 during the filtration process. And the water level in the air pipe 19 is a position where a water head difference for performing the filtration process in the membrane unit 12 is obtained.
[0016]
In addition, an aeration tank 22 having an aeration device 21 and a settling tank 24 having an inner cylinder 23 are provided in the previous stage of the solid-liquid separation device 11, and flowed into the aeration tank 22 from the raw water inflow path 25. After the raw water is aerated, it is sent to a sedimentation tank 24 by a pump 26, and solids having a relatively good sedimentation property are precipitated and separated in this sedimentation tank 24 in advance. The solid matter (sludge) precipitated and separated in the settling tank 24 is returned to the aeration tank 22 via a pump 27 or the like so as to maintain the amount of microorganisms.
[0017]
As shown in the side view of FIG. 2, the membrane unit 12 has a plurality of flat membrane type membrane modules 32 arranged so that the membrane surfaces (filtration surfaces) 31 are in the vertical direction and the membrane surfaces are parallel to each other. It is formed by. What is necessary is just to select what has the mesh width according to the magnitude | size of the separation / removal object for this membrane module 32, and also selects a flat membrane type, a hollow fiber type, a spiral type, and other membrane modules suitably as a model. However, the flat membrane type is optimal in consideration of cleaning properties and strength. In addition, a branch pipe 33 connected to the filtered water outflow portion is provided above each membrane module 32, and is connected to the filtered water outflow pipe 17 through a main pipe 34.
[0018]
Although the space | interval t between the membrane surfaces in each adjacent membrane module 32 can be arbitrarily set according to the state of raw | natural water and the washing | cleaning frequency, it is desirable to set it as a fixed space | interval in the range of 1-15 mm, Preferably it is 1-8 mm. If the distance between the membrane surfaces is less than 1 mm, the solid material peeled off from the membrane surface by the cleaning operation may be clogged between the membrane surfaces and hinder the cleaning operation or filtration operation. On the other hand, even if the interval is widened, there is no effect on the washing operation or the filtration operation, but the filtration area per unit volume is reduced, and the filtration tank 13 is increased in size.
[0019]
Specifically, when the cleaning frequency is once / day and the SS in the raw water is about 100 mg / L, the interval t can be set to about 1 mm, and the SS in the raw water is about 500 mg / L. In this case, it is preferable to set the interval t to about 6 mm. In addition, although the space | interval of membrane surfaces can be arbitrarily set according to the state of the membrane module 32, a space | interval may be non-uniform | heterogenous, but a uniform filtration effect | action can be anticipated as a whole by making a space | interval constant. At the same time, a uniform cleaning effect can be expected.
[0020]
The upper part of the membrane unit 12 is used as a membrane surface cleaning means for cleaning the surface of the membrane module 32 with raw water. The raw water is guided to the whole membrane unit 12 and flows down evenly onto the surface of each membrane module 32. Therefore, a raw water guide portion as shown in FIGS. 3 to 10 is provided. The structure of this raw water guide part can adopt various forms according to conditions such as the size of the filtration tank 13 and the amount of incoming raw water. 3 to 10 are schematic views showing various forms of the raw water guide section.
[0021]
First, the first embodiment of the raw water guide portion shown in FIG. 3 is provided with a raw water dispersion plate 51 provided with a porous plate or a large number of slits above the membrane unit 12, and includes a raw water inflow portion (raw water inflow pipe). 16), the raw water flowing into the filtration tank 13 is guided to the whole membrane unit 12 through the through-holes or slits 52 of the raw water dispersion plate 51 so that the raw water flows down the surface of each membrane module 32. In the second embodiment shown in FIG. 4, by providing a shower nozzle 53 above the membrane unit 12 as a raw water guide portion, the raw water flowing into the filtration tank 13 from the raw water inflow pipe 16 is dispersed throughout the membrane unit 12. I am doing so. A plurality of shower nozzles 53 can be provided according to the size of the membrane unit 12.
[0022]
In the third embodiment shown in FIGS. 5 and 6, the raw water inflow pipe 16 is branched into a plurality of branch pipes 54, and a guide plate 55 is provided at the end of each branch pipe 54 to guide the inflow direction of the raw water. The guide plate 55 guides the raw water flowing into the filtration tank 13 to the entire membrane unit 12.
[0023]
In the fourth embodiment shown in FIGS. 7 and 8, a plurality of spray pipes 56 are branched and connected to the tip of the raw water inflow pipe 16, and flow into the filtration tank 13 from a large number of spray holes 57 provided in each nozzle pipe 56. The raw water is guided to the whole membrane unit 12. In the fifth embodiment shown in FIGS. 9 and 10, a plurality of tubs 58 are installed in place of the spray pipe 56 in the fourth embodiment, and the filtration tank 13 is formed from a large number of overflow notches 59 provided on the side walls of each tub 58. The raw water flowing in is guided to the whole membrane unit 12.
[0024]
By providing such various raw water guide portions, raw water can be guided to the entire membrane unit 12, and the surface of each membrane module 32 can be cleaned with raw water during membrane cleaning. In addition, these raw | natural water guide parts can also combine several means suitably, and can select the optimal raw | natural water guide part according to SS density | concentration and inflow amount in raw | natural water. Furthermore, when the space | interval t between membrane surfaces is narrow enough and the upper part of the membrane unit 12 can anticipate the function as a raw | natural water guide part similar to the raw | natural water dispersion | distribution plate 51 etc. which were shown in the said FIG. The raw water can be made to flow uniformly over the surface of each membrane module 32 simply by feeding the raw water into the upper part.
[0025]
Filtration processing of overflow water (raw water in the solid-liquid separation device 11) subjected to precipitation separation processing in the precipitation tank 24 is performed according to the following procedure. First, in the filtration process, the mud valve 18a is closed and the raw water inflow valve 16a is open, and the raw water temporarily stored in the raw water storage tank 14 through the path 41 from the settling tank 24 passes through the raw water inflow pipe 16. Then, it flows into the filtration tank 13 and is filtered (solid-liquid separation) by the membrane unit 12.
[0026]
The filtered water filtered by the membrane unit 12 flows into the filtered water storage tank 15 through the filtered water outflow pipe 17, and is sterilized, for example, sodium hypochlorite solution or ozone water from the path 42 as necessary. Is added to the river or the like through the path 43. The sterilizing agent can also be formed so as to be added from the path 44 connected to the filtered water outflow pipe 17 as indicated by an imaginary line.
[0027]
In the membrane unit 12, in the initial stage of the filtration process, as shown in FIG. 11, the solid matter 37 larger than the pores 36 is captured, and the small solid matter 38 passes through the pores 36 together with the filtered water 39. As the process proceeds, as shown in FIG. 12, the solid matter 37 captured by the pores 36 captures the small solid matter 38 and removes it from the water.
[0028]
At the start of the filtration process, the pressure loss in the membrane unit 12 is small, so the water level in the raw water storage tank 14 is low as shown in FIG. As the material accumulates, the pressure loss gradually increases. When the pressure loss of the membrane unit 12 increases in this way, the water level in the raw water storage tank 14 rises according to the increase.
[0029]
And as shown in FIG. 13, when the water level in the raw | natural water storage tank 14 rose to the preset washing start water level, a filtration process is interrupted and the drainage process which is the first process of the washing | cleaning operation of the membrane unit 12 is carried out. Start. In the draining process, first, the raw water inflow valve 16a is closed to stop the inflow of raw water from the raw water storage tank 14 to the filtration tank 13, and then the sludge deposited on the bottom of the filtration tank 13 is opened by opening the drainage valve 18a. It discharges from the mud pipe 18 together with water. At this time, when air flows into the filtration tank 13 from the air pipe 19, the sludge can be discharged smoothly, and the flow rate of the water flowing down along the membrane surface is increased so as to have a solid peeling effect. Can do. The sludge discharged from the filtration tank 13 in this drainage process is returned to the first settling basin together with the sludge extracted from the settling tank 24, or treated as excess sludge. Further, by discharging the water in the filtration tank 13 and exposing the membrane unit 12 to the air, the solid matter layer (sludge layer) deposited on the membrane surface is easily peeled off.
[0030]
Furthermore, if the water level in the filtration tank 13 falls, as shown in FIG. 14, the filtered water in the said backwash water storage part 15a will be filtered by the water head difference which arises by the height difference of the membrane unit 12 and the filtrate water storage tank 15. As shown in FIG. As shown in FIG. 15, the filtered water 39 is ejected from the pores 36 of the membrane unit 12 to perform a back washing process, and the solids 37 and 38 deposited on the membrane surface are removed. It will be in the state where it peeled off and floated. In addition, the precipitation separation process in the settling tank 24 is continued during the steps so far, and the overflow water flows into the raw water storage tank 14 through the path 41.
[0031]
Finally, as shown in FIG. 16, the raw water inflow valve 16a is opened to resume the flow of raw water from the raw water storage tank 14 to the filtration tank 13, and the membrane unit 12 is cleaned. The raw water flowing into the filtration tank 13 from the raw water inflow pipe 16 is guided from the raw water guide portion to the membrane surface 31 of each membrane module 32 as described above, and the solid matter deposited on the membrane surface is removed. It will be separated and washed away with the flow of raw water. The washed solid matter is discharged from the mud pipe 18 together with the washed water. This washing process is performed until the raw water in the raw water storage tank 14 runs out or until a preset low water level is reached. After completion of the cleaning process, the drainage valve 18a is closed to enter the state of the filtration process. When the raw water is filled in the filtration tank 13 and the water level in the raw water storage tank 14 becomes the filtered water level, the raw water is filtered. . In addition, it is also possible to perform the said backwashing process and a washing | cleaning process simultaneously, and you may make it close the waste mud valve 18a during a washing | cleaning process.
[0032]
Further, depending on the quality of the raw water, microorganisms may propagate on the membrane surface and block the pores 36. In such a case, in the backwashing step, the backwashing water and By adding a chemical solution (sterilizing agent) such as sodium hypochlorite solution or ozone water to the filtered water, the microorganisms can be killed and removed, and the clogging of the membrane unit 12 by the microorganisms can be suppressed. .
[0033]
Furthermore, depending on the quality of the raw water, the membrane unit 12 can be sufficiently washed by the action of the water flow in the draining step and the washing step, so the back washing step can be omitted. In this case, the backwash water storage unit 15 a is not necessary, and the filtrate storage tank 15 can be positioned below the membrane unit 12.
[0034]
Such filtration process, draining process, back washing process, and washing process are continuously repeated, and the membrane surface of the membrane unit 12 is washed with raw water that performs filtration treatment (solid-liquid separation treatment). The water recovery rate can be improved compared to when a part of water is used as washing water. Furthermore, the membrane area per unit volume can be increased to reduce the size of the filtration tank 13 by setting the distance between the membrane surfaces narrower than when air scrubbing is performed.
[0035]
In addition, by setting the installation height of the membrane unit 12, the raw water storage tank 14 and the filtrate water storage tank 15 so that the raw water filtration process can be performed by the water head difference, the filtration pump can be omitted, and also the water head difference By setting so that the backwashing process with filtered water can be performed, the backwash pump can also be omitted. Further, by detecting the level of the raw water storage tank 14 and determining the clogged state of the membrane unit 12, automatic operation is possible using a simple water level meter or the like, and it is necessary to provide complicated equipment such as a pressure gauge. Disappear. Furthermore, equipment such as a pump and a blower is not required and only the raw water inflow valve 16a and the mud discharge valve 18a are opened and closed, so that the device configuration can be greatly simplified.
[0036]
And as shown in FIG. 1, the precipitation tank 24 is installed in the front | former stage of the solid-liquid-separation apparatus 11, and the load concerning the membrane unit 12 is removed by removing the solid substance with high sedimentation in this precipitation tank 24 beforehand. Can be reduced and the membrane cleaning cycle can be extended. Moreover, by combining the sedimentation separation process by the sedimentation tank 24 and the membrane filtration process by the membrane unit 12, it is possible to expand the possibility of adaptation to measures against overflowing water in the rain and advanced treatment measures for sewage. A solid-liquid separation system can be expected.
[0037]
【The invention's effect】
As described above, according to the present invention, since the membrane unit is washed by spraying raw water, the water recovery rate can be improved. Moreover, since the space | interval of membrane surfaces can be narrowed, the filtration processing capability can be improved and size reduction of an apparatus can be achieved. Further, by installing the raw water storage tank and the filtered water storage tank at a predetermined height before and after the filtration layer, the washing operation can be automatically performed only by opening and closing the valve. In addition, by installing a precipitation tank in the previous stage, the load on the membrane unit can be reduced, and an effective solid-liquid separation process can be performed.
[Brief description of the drawings]
FIG. 1 is a system diagram showing an embodiment in which a solid-liquid separator that performs a cleaning method of the present invention is applied to water treatment equipment using an activated sludge method.
FIG. 2 is a side view showing an arrangement state of the membrane module and the raw water guide portion in the membrane unit.
FIG. 3 is a schematic cross-sectional view showing a first embodiment of a raw water guide part.
FIG. 4 is a schematic sectional view showing a second embodiment of the raw water guide part.
FIG. 5 is a schematic cross-sectional view showing a third embodiment of the raw water guide portion.
FIG. 6 is a schematic plan view of the same.
FIG. 7 is a schematic sectional view showing a fourth embodiment of the raw water guide part.
FIG. 8 is a schematic plan view of the same.
FIG. 9 is a schematic cross-sectional view showing a fifth embodiment of the raw water guide portion.
FIG. 10 is a schematic plan view of the same.
FIG. 11 is an explanatory diagram showing a solid separation state in the initial stage of the filtration step.
FIG. 12 is an explanatory diagram showing a state of separation of solids during the progress of the filtration process.
FIG. 13 is an explanatory view showing a state at the end of the filtration step.
FIG. 14 is an explanatory view showing a state during a drainage process.
FIG. 15 is an explanatory diagram showing a state during a backwashing process.
FIG. 16 is an explanatory diagram showing a state during a cleaning process.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 ... Solid-liquid separator, 12 ... Membrane unit, 13 ... Filtration tank, 14 ... Raw water storage tank, 15 ... Filtrated water storage tank, 16 ... Raw water inflow pipe, 16a ... Raw water inflow valve, 17 ... Filtrated water outflow pipe, 18 DESCRIPTION OF SYMBOLS ... Mud pipe, 18a ... Mud valve, 19 ... Air pipe, 21 ... Air diffuser, 22 ... Aeration tank, 23 ... Inner cylinder, 24 ... Settling tank, 25 ... Raw water inflow path, 26 ... Pump, 31 ... Membrane 32, membrane module, 33 ... branch pipe, 34 ... main pipe, 51 ... raw water dispersion plate, 52 ... through hole or slit, 53 ... shower nozzle, 54 ... branch pipe, 55 ... guide plate, 56 ... spraying pipe, 57 … Spray hole, 58… 樋, 59… overflow notch

Claims (2)

  1. The raw water flows from the raw water inflow section into the filtration tank in which the membrane unit for solid-liquid separation is immersed by a plurality of membrane modules arranged with the membrane surface in the vertical direction, and the filtered water that permeates the membrane unit flows out to the filtered water. In the cleaning method of the solid-liquid separator for causing the sludge in the filtration tank separated by the membrane unit to be discharged from the sludge discharge section, the cleaning unit is disposed above the membrane unit in the previous stage of the filtration tank. While installing a raw water storage tank for storing raw water, connecting the raw water inflow portion of the filtration tank and the raw water storage tank with a raw water inflow pipe provided with a raw water inflow valve, detecting the water level of the raw water storage tank, upon detecting the water level has reached the washing water level previously set, from the water inlet pipe of the water inlet valve close the water inlet after stopping the flow of raw water to the filter container, in said filter tank The mud is discharged from the sludge discharge section together with the water in the filtration tank, and the membrane unit is exposed on the water surface, through the raw water guide section that guides the raw water from the raw water inflow section to the entire membrane unit. A method for cleaning a solid-liquid separator, wherein raw water is introduced to clean the surface of the membrane module.
  2. A filtrate storage tank for storing filtrate water is installed at a position above the membrane unit at the subsequent stage of the filtration tank , and the filtrate water stored in the filtrate storage tank is transferred from the filtrate water outlet to the membrane unit. The sludge in the filtration tank is discharged from the sludge discharge part together with the water in the filtration tank, and the filtrate stored in the filtrate storage tank is discharged from the filtrate water outflow part to the membrane unit. 2. The method for cleaning a solid-liquid separator according to claim 1 , wherein the membrane unit is back-flushed to perform backwashing, and then the membrane unit is exposed on the water surface .
JP2002307217A 2002-10-22 2002-10-22 Cleaning method for solid-liquid separator Expired - Fee Related JP3984145B2 (en)

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KR100572982B1 (en) * 2004-06-07 2006-04-24 주식회사 하나포스텍 Water Treating System Equipped with Drying Device and Incinerating Device
JP4492268B2 (en) * 2004-09-16 2010-06-30 栗田工業株式会社 Biological treatment equipment
JP4529670B2 (en) * 2004-12-14 2010-08-25 栗田工業株式会社 Biological treatment equipment
JP5138206B2 (en) * 2006-11-22 2013-02-06 ダイセン・メンブレン・システムズ株式会社 Oil-containing wastewater treatment method
JP4996516B2 (en) * 2008-03-24 2012-08-08 メタウォーター株式会社 Reclaimed water production method
JP6016405B2 (en) * 2012-03-28 2016-10-26 三菱レイヨン株式会社 Waste water treatment system and waste water treatment method
JP6191464B2 (en) * 2012-10-31 2017-09-06 東レ株式会社 Operation method of turbidity removal membrane module
JP2015199056A (en) * 2014-03-31 2015-11-12 国立大学法人 筑波大学 Suspension water treatment device and cleaning, classification and treatment system
US10576427B2 (en) 2014-08-29 2020-03-03 Mitsubishi Electric Corporation Method and apparatus for cleaning filter membrane, and water treatment system

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