JP2004283651A - Suspension water quality measurement device - Google Patents

Abstract

An object of the present invention is to provide a highly accurate and highly reliable water quality measuring device for separating a clarified liquid from a mixed liquid containing a suspension.
A water quality measuring device for a suspension forms a first chamber (50a) and a second chamber (50b) with a mesh material (53), and introduces the suspension into the first chamber and discharges the suspension from the second chamber. A separation facility 50 and a membrane separation facility 60 for passing water through the roughly separated suspension in the second chamber 50b are provided. Further, a suction pump 62 connected to the membrane separation equipment 60 for solid-liquid separation of the coarse separation suspension, a separation liquid storage equipment 80 for temporarily storing the separation liquid 63, and a water quality for measuring the water quality of the stored separation liquid The measuring equipment 90 is provided.
[Selection diagram] Fig. 1

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a water quality measuring device for a plant that treats municipal sewage and industrial wastewater, and more particularly to a measuring device that stably measures the water quality of a mixed solution containing suspended matter.
[0002]
[Prior art]
In the sewage treatment plant, advanced treatment that can remove nitrogen and phosphorus in addition to organic matter in sewage is introduced to protect the environment. In the advanced treatment, if a microbial reaction tank in which an anaerobic tank and an aerobic tank are appropriately arranged can be treated according to the quality of the incoming sewage. However, the metabolic function of activated sludge is continually changing, being sensitive to disturbances such as the flow rate of incoming sewage, water quality, and water temperature. In order to maintain a predetermined quality of treated water in an advanced treatment plant, proper operation management corresponding to the current metabolic function is required.
[0003]
On the other hand, operation management in consideration of the reaction state of activated sludge includes biological oxygen demand (BOD), chemical oxygen demand (COD), total organic carbon (TOC), and ultraviolet chemical oxygen demand (UV). -COD) or the like is required as an index. Further, nitrogen concentrations such as total nitrogen (TN), ammonia nitrogen (NH4-N), nitrate nitrogen (NO3-N) and nitrite nitrogen (NO2-N), total phosphorus (TP) and orthophosphate phosphorus The phosphorus concentration and alkalinity of (PO4-P) are required. In addition, from the viewpoint of environmental protection of the effluent area, environmental hormones, trihalomethane precursors, chromaticity, etc. are also important monitoring items.
[0004]
In order to accurately measure the above-mentioned substance concentration and realize proper operation management, it is necessary to supply a clear sample from which activated sludge and suspended substances have been separated and removed to a measuring instrument. A method has been proposed in which a suspended matter such as activated sludge is separated into solid and liquid by using a membrane, and the separated liquid is used as a sample of a water quality measuring instrument, and a method of using the measurement information for control.
[0005]
For example, in Patent Document 1, inflow water or treated water is directly introduced into an ultrafiltration membrane device, and the nitrogen concentration and pH of the separated liquid are measured. Patent Document 2 discloses that a suspension from which impurities are removed in advance by a strainer provided with a screen capable of being washed with compressed air in a biological reaction tank is solidified by a membrane filtration unit comprising a reverse osmosis membrane, an ultrafiltration membrane and a precision membrane. The liquid is separated and the nitrogen concentration of the separated liquid is measured. Patent Literature 3 proposes a water quality measuring device clarifier for directly introducing inflow water into a water tank containing a hollow fiber membrane module and performing suction filtration from the inside of the hollow fiber membrane in an external pressure state. In this proposal, when the suction pressure becomes equal to or higher than a set value, air is injected into the hollow fiber membrane, and the filtrate is caused to flow backward to remove the turbid matter attached to the membrane surface.
[0006]
[Patent Document 1]
JP-A-11-57780 (paragraph 0022-0027, FIG. 1)
[Patent Document 2]
JP-A-10-38876 (paragraphs 0015-0017, FIG. 1)
[Patent Document 3]
JP 2001-281240 A (Paragraph 0011-0014, FIG. 1)
[Patent Document 4]
JP-A-7-204473 (paragraphs 0019-0021, FIG. 3)
[0007]
[Problems to be solved by the invention]
For measurement control of sewage treatment plants, etc., a cross-flow method that can provide a measured value with little time delay to the liquid tank to be treated is effective because the separated sample water for measurement does not change the water quality during the membrane separation operation. is there.
[0008]
Patent Literature 1 and Patent Literature 2 propose a cross-flow type membrane filtration / separation apparatus for sewage treatment plants, but do not take any measures against clogging or breakage of the membrane surface. However, activated sludge in a sewage treatment plant is sticky, and its concentration is as high as 1000 to 3500 mg / L in a biological reaction tank. When such an activated sludge mixture is separated by filtration, the sludge adheres significantly to the membrane surface, does not easily separate even in the flow of the liquid to be treated, and the filtration capacity is reduced in a short period of time. Can not supply.
[0009]
Patent Literature 2 proposes a measure for installing a strainer with a screen in a biological reaction tank, but the strainer is washed with compressed air. Therefore, it is difficult to apply the method to an anaerobic tank to which air cannot be supplied or a sedimentation tank for allowing sludge to stand still. Further, the activated sludge mixture in the biological reaction tank is very turbid, and it is impossible to see the strainer installed below the liquid level, and it is not possible to directly grasp the clogging and the cleaning state. Therefore, at the time of abnormality or maintenance and inspection, a great deal of labor is required, such as taking up the entire strainer including the suspension sampling pipe and taking measures.
[0010]
In Patent Document 3, the membrane is cleaned by flowing the filtrate back from the filtrate (permeate) to the liquid to be treated (supplied), but the suspension adhering to the membrane on the liquid to be treated is removed. It is difficult to wash evenly. In particular, the backflow medium passes through the suspended mass, i.e. the less clogged portion, and reduces the washing efficiency. Further, in these systems, the suspension is directly supplied to the separation device, and clogging with foreign substances is also overlapped, so that it is necessary to carry out backwashing at high frequency. As a matter of course, at the time of this backwashing operation, the filtrate cannot be secured, and at the same time, the influence of the medium used for the backwash disappears, and the filtrate is used as a measurement sample until a fresh filtrate is obtained. Not available.
[0011]
On the other hand, in Patent Document 4, the film surface on the liquid to be treated side is intermittently mechanically cleaned. Although this method has the effect of cleaning the entire surface of the film, it is an intermittent type that periodically cleans the film to be cleaned. Progresses. The intermittent mechanical cleaning system repeats the adhesion and removal of sludge, in other words, clogging and regeneration. Incidentally, activated sludge has adhesiveness, and it is not easy to remove sludge layered on the entire surface of the membrane. In particular, in this method in which the flat membrane is rotated in the filtration tank containing the liquid to be treated, and the cleaning tool is intermittently fixed, the layered sludge on the entire surface of the membrane is only swept around the cleaning tool, and is separated. As a result, there is a problem that the cleaning effect is impaired.
[0012]
An object of the present invention has been made in view of the above-mentioned problems of the related art, and provides a water quality measuring device that supplies a clear sample to a measuring instrument and measures even a mixed solution containing a suspended matter such as activated sludge. Is to do. This makes it possible to provide appropriate plant management information.
[0013]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, a water quality measuring device of the present invention comprises two chambers made of a mesh material, a coarse separation facility for introducing and discharging a suspension into a first chamber, and a second separation facility for the coarse separation facility. A membrane separation facility for sucking the roughly separated suspension in the room to perform solid-liquid separation, a suction means thereof (a suction pump 62 in the embodiment), and a separated liquid storage facility for temporarily storing the separated liquid from the membrane separation facility; It is characterized by having a water quality measuring device for measuring the water quality of the stored separated liquid.
[0014]
By introducing the suspension into the first chamber of the coarse separation facility partitioned by the mesh material, the second chamber is filled with the coarsely separated suspension in which impurities mixed in the suspension are removed by the mesh material. It is. By introducing the crude separation suspension to the membrane separation equipment, the clogging of the flow path and the damage to the membrane surface are reduced in the membrane separation equipment, and the solid-liquid separation operation can be performed in a long-term stable manner. The sample can be supplied continuously.
[0015]
The coarse separation equipment is installed on land, and the first chamber is set to the overflow discharge method, so that the clogging state of the mesh material can be immediately grasped by comparing the water levels of the first chamber and the second chamber. If the water level in the second chamber is lower than the first chamber, it is determined that clogging has occurred, and the mesh material can be washed or replaced. It is also possible to install a plurality of mesh members having a small width in the direction of the second chamber, thereby improving the ability to remove impurities and preventing the inflow of the impurities into the second chamber at the time of washing and replacing the mesh members.
[0016]
By flowing the liquids in the first and second chambers with the agitation equipment, some of the contaminants captured by the mesh material can be separated into the first chamber, and clogging of the mesh material can be suppressed. In addition, sedimentation of suspended solids and generation of scum-like substances (suspended substances floating on the water surface) can be prevented in the coarse separation facility, and the effect of suppressing water quality changes and clogging of the mesh-like material in the coarse separation facility can be prevented. There is.
[0017]
The membrane separation equipment according to the present invention employs a cross-flow method using a flat membrane, and has means for mechanically and continuously cleaning the membrane surface on the coarse separation suspension side (in the embodiment, a cleaning tool 68). Is returned to the second chamber of the coarse separation facility. The continuous mechanical washing is to remove suspended substances in the coarsely separated suspension subjected to solid-liquid separation at the same time as adhering to the membrane surface and peeling off the suspended substances to form a cake layer (stratification). To prevent.
[0018]
The flow accompanying the cross-flow method has the synergistic effect of removing suspended substances removed by mechanical cleaning and applying vibration to the membrane surface to enhance the peeling ability by mechanical cleaning, in addition to the removal of substances adhered to the membrane surface. To prevent film clogging. Refluxing the coarse separation suspension after the separation operation to the second chamber of the coarse separation equipment reduces the flow amount from the first chamber to the second chamber of the coarse separation equipment and reduces the amount of mesh material due to impurities. It has a function to suppress clogging and to wash the mesh material by removing impurities trapped in the mesh material into the first chamber. These have an effect attributed to the cross-flow method.
[0019]
In the membrane separation equipment, one set or a plurality of sets of filtration vessels and suspension vessels are alternately arranged via a flat membrane, and interlocked with driving means (motor 66 in the embodiment) provided outside these vessels. The rotating washing tool is loosely inserted into the suspension container. Then, while the respective membrane surfaces are directly washed, the roughly separated suspension is distributed and passed through each suspension container, and solid-liquid separation is performed by suction means connected to all the filtration containers. With such a configuration, all of the laminated membrane surfaces can always be uniformly washed, and the flow rate in the suspension vessel is increased by the distribution and flow of the coarsely separated suspension, thereby further enhancing the membrane surface cleaning effect. .
[0020]
Among the membrane separation equipment, the filtration vessel and the suspension vessel, and the flat membrane and the cleaning tool are integrated into a module to be handled as a cartridge. The coarse separation suspension introduced into the membrane separation equipment does not flow out of the module, and the module can be easily attached and detached.
[0021]
The following adjustment mechanism and control device are provided in the membrane separation equipment. The driving means is provided with a rotation speed adjusting mechanism capable of adjusting the rotation speed, and the suction means is provided with a suction amount adjusting mechanism capable of adjusting the suction amount (or operation / stop time). A water flow rate adjusting mechanism capable of adjusting a water flow rate (or an operation / stop time) of the coarsely separated suspension to the suspension container; a water level measuring means for measuring a separated liquid level of the separated liquid storage facility; And a controller that determines the separation state of the membrane separation equipment based on a predetermined value set in advance. When the control device determines that the filtration flux is abnormal, the controller controls the rotation speed adjustment mechanism, the suction amount adjustment mechanism, and the water flow rate adjustment mechanism in a predetermined order so as to maintain a predetermined filtration flux.
[0022]
For example, when the filtration flux decreases, the number of rotations of the cleaning jig is first increased to eliminate the material clogging the membrane surface, and the filtration flux is increased. If the specified filtration flux is not obtained even when the rotation speed is increased to the maximum, then increase the filtration pressure by increasing the water flow rate of the coarsely separated suspension to the suspension vessel, and increase the filtration flux. Increase. In addition, there is also an effect of removing suspended substances adhering to the membrane surface and the cleaning jig by increasing the flow rate of water. If the predetermined filtration flux cannot be obtained even when the flow rate is increased to the maximum, the filtration pressure is increased by increasing the pump suction amount, and the filtration flux is increased. If a predetermined filtration flux cannot be obtained even when the suction amount is increased to the maximum, an alarm is generated. Since these operations can be performed without impairing the solid-liquid separation operation, the filtration flux can be continuously maintained. Further, when the filtration flux is obtained more than necessary, a predetermined filtration flux is maintained by performing an operation reverse to the above operation.
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described. FIG. 1 is a block diagram showing the configuration of a water quality meter according to one embodiment. The water quality measuring device 100 includes a coarse separation facility 50, a membrane separation facility 60, a separated liquid storage facility 80, a water quality measurement facility 90, a suspension supply pump 51, a coarse separation suspension supply pump 54, and a suction pump 62. . The coarse separation equipment 50 is divided into a first chamber 50a and a second chamber 50b by a mesh material 53, has a stirrer 52 for flowing the liquid in both chambers, and the first chamber 50a side has an overflow structure. The plant facility 1 is, for example, an activated sludge reaction tank.
[0024]
The mesh material 53 can be made of metal, plastic, cloth or the like. The mesh is set in consideration of the flow path diameter of the membrane separation equipment. According to an experiment performed by the present inventors on a suspension in a sewage treatment plant, a mesh width of 2 mm or more was preferable.
[0025]
The suspension supply pump 51 guides a part of the suspension 1 a in the reaction tank 1 as a supply liquid 55 to the first chamber 50 a of the coarse separation facility 50, and returns the overflow liquid 56 to the reaction tank 1. The coarse separation suspension 57 from which the food debris, seeds, hair, wood chips, and foreign substances such as plastic and rubber in the supply liquid 55 are removed by the mesh material 53 flows into the second chamber 50b. The coarse separation suspension 57 in the second chamber 50 b is passed through the membrane separation equipment 60 by the coarse separation suspension supply pump 54.
[0026]
The membrane separation equipment 60 is of a cross-flow type (details will be described later). Send water to 80. Most of the coarse separation suspension after passing through the membrane surface is returned to the second chamber 50b of the coarse separation equipment 50 as the discharge suspension 61. Although the discharged suspension 61 may be returned directly to the reaction tank 1, the self-cleaning effect of separating and removing impurities trapped on the first chamber 50 a side of the mesh material 53 by refluxing to the second chamber 50 b is achieved. is there.
[0027]
The stirrer 52 prevents the activated sludge from settling in the first chamber 50a and the second chamber 50b, and further exchanges the liquid in both chambers to make the water quality in the coarse separation equipment 50 uniform and to form a mesh. It has a cleaning function to peel off contaminants captured by the material 53 toward the first chamber 50a.
[0028]
In this way, by introducing the coarsely separated suspension 57 to the membrane separation facility 60, blockage of the flow path and damage to the membrane surface are reduced in the membrane separation facility, and a stable solid-liquid separation operation can be performed over a long period of time. A clear sample can be continuously supplied to the measuring equipment 100.
[0029]
The separated liquid 82 temporarily stored in the separated liquid storage equipment 80 is periodically sampled by a sampling pump incorporated in the water quality measurement equipment 90, and the water quality measurement equipment 90 measures the concentration in water based on a predetermined measurement method. I do. The separated liquid storage facility 80 has a storage volume that secures at least the amount that the water quality measurement facility 90 collects at one time, and causes the surplus liquid 84 to overflow and discharge.
[0030]
The water quality measurement equipment 90 is a measurement error when the activated sludge contains a predetermined concentration or more, an organic substance concentration such as BOD, COD, TOC and UV-COD, a nitrogen concentration such as TN, NH4-N, NO3-N and NO2-N, and a TP. And PO4-P phosphorus concentration and alkalinity. In addition, environmental hormones, trihalomethane precursors, chromaticity, etc. are also targeted.
[0031]
The residence time of the crude separation equipment 50 and the membrane separation equipment 60 is desirably 30 minutes or less so as not to change the concentration of the substance to be measured in water in the equipment. The suspension supply pump 51 is installed on land, but may be an underwater installation type in which it is directly immersed in the plant facility 1.
[0032]
FIG. 2 shows a configuration example of the membrane separation equipment. In the membrane separation equipment 60, a filtration vessel 64 and a suspension vessel 65 are installed laterally with a flat membrane 69 interposed therebetween, and these are sealed and fixed via a sealing material 71 such as an O-ring or packing. A cleaning tool 68 that is loosely inserted into and interlocked with a rotating shaft 67 of a motor 66 with a speed reducer is arranged so as to contact the flat membrane 69 on the suspension container 65 side. The motor 66 is continuously operated, and the flat film 69 is continuously cleaned by the cleaning tool 68. The coarse separation suspension 57 flows in from the lower part of the suspension vessel 65, and the discharge suspension 61 is guided to the second chamber 50b of the coarse separation equipment 50 from the upper part. As a result, the carry-in bubbles of the coarse separation suspension 57 can be discharged without collecting in the container.
[0033]
The filtration container 64 is provided with a perforated plate 70 built in for the purpose of reinforcing the flat membrane 69 and collecting the filtrate, and a water collecting port 72 communicating with the perforated plate 70. The suction pump 62 connected to the water collecting port 72 is operated, and the roughly separated suspension 57 is subjected to membrane filtration by a cross-flow method, and the separated liquid 63 is sent to the separated liquid storage facility 80. Suspended matter trapped on the membrane surface of the suspension vessel 65 in the course of this filtration is continuously washed with the flow of the cleaning tool 68 and the coarsely separated suspension 57 simultaneously with the capture, and is discharged from the suspension vessel 65. . In addition, the filtration container 64 and the suspension container 65 and the flat membrane 69 and the cleaning tool 69 can be integrated into a module to be handled as a cartridge.
[0034]
FIG. 3 shows another embodiment of the membrane separation equipment, in which a flat membrane is laminated. In the membrane separation equipment 60, three filtration vessels 64a, 64b, 64c and two suspension vessels 65a, 65b are alternately arranged, and four flat membranes 69a-69d are provided therebetween. The filtering containers 64a and 64c at both ends are configured to filter from one surface, and the intermediate filtering container 64b is configured to filter from both surfaces. The water collecting ports 72 provided on the upper portions of the respective filtration containers communicate with each other and are connected to the suction pump 62. 79 is a drain pipe of a filtration container.
[0035]
The suspension containers 65a and 65b have a hollow structure, and a cleaning tool 68 capable of directly cleaning the flat membranes 69 disposed on both surfaces in conjunction with the rotating shaft 67 is loosely inserted into each container. The roughly separated suspension 57 branches off, flows in from the lower part of each of the suspension vessels 65a and 65b, and discharges from the upper part. The discharged liquids are combined to form a discharged suspension 61.
[0036]
FIG. 4 shows a configuration example of the cleaning tool. In the cleaning tool 68 in the example of FIG. 3, the fine hairs 68b are arranged in layers on both sides of a frame 68a having an opening 68c in the center where the rotating shaft 67 is inserted. The fine bristles 68b have such a length that they contact at least both film surfaces when laminated and fixed. The opening 68c is slightly larger than the rotation shaft 67 to provide play. Thereby, the whole of the cleaning tool 68 rotates continuously in conjunction with the rotating shaft 67, and the fine hairs 68b can evenly contact the flat films 69 on both sides at any rotational position. This is called loose insertion, and is effective for uniform cleaning of both film surfaces and prevention of damage. If the cross-sectional shape of the rotating shaft 67 and the opening 68c is rectangular, the cleaning tool 68 is not fixed and interlocks with the rotating shaft 67.
[0037]
In the example of FIG. 3, three filtration vessels 64 and two suspension vessels 65 are used, but the present invention is not limited to this, and n filtration vessels and n−1 suspension vessels are used. It is also possible to form a set, and to stack these containers in the vertical direction.
[0038]
With such a configuration, all of the laminated membrane surfaces can always be uniformly washed, and the flow rate in the suspension vessel is increased by the distribution and flow of the coarsely separated suspension, thereby further enhancing the membrane surface cleaning effect. .
[0039]
FIG. 5 shows a configuration diagram for controlling the water quality measuring device. This example is a method of maintaining the filtration flux on the flat membrane 69 surface. The controller 54a indicates the number of rotations or the time of operation and stop of the coarse separation suspension supply pump 54, the controller 62a indicates the number of rotations or time of operation and stop of the suction pump 62, and the controller 66a indicates the number of rotations of the motor 66. It is a device that can instruct adjustment.
[0040]
A water level gauge 85 is installed in the separated liquid storage facility 80, and the measured value L is input to the control device 88. When the water level measurement value L of the storage facility 80 is equal to or less than the set value Lmin, the control device 88 determines that the sample amount is insufficient, and operates the controller 62a and the like in a direction to increase the filtration flux. If the measured water level L is equal to or greater than the set value Lmax, it is determined that the sample amount is excessive, and the controller 62a and the like are operated in a direction to reduce the filtration flux. The water level set value Lmin is set so as to have a volume equal to or larger than at least the amount used by the water quality measurement equipment 90 for one measurement.
[0041]
FIG. 6 shows a control flow of the control device. The control device 88 first determines whether the water level measurement value L of the water level gauge 85 is equal to or less than the set value Lmin in step S1. If it is equal to or less than Lmin, the flow proceeds to step S2 to increase the filtration flux, and if not, the flow proceeds to step S9.
[0042]
In step S2, it is determined whether the motor operation amount A of the motor 66 of the membrane separation equipment 60 is the maximum value Amax. If it is Amax, the process proceeds to step S3; otherwise, the process proceeds to S4, where the motor operation amount A is increased by a fixed amount (ΔA), and the processing ends. In step S3, it is determined whether the coarse separation suspension supply pump operation amount B of the coarse separation suspension supply pump 54 is the maximum value Bmax. In the case of Bmax, the process proceeds to step S5; otherwise, the process proceeds to S6, and the coarse separation suspension supply pump operation amount B is increased by a certain amount (ΔB), and the processing is ended. In step S5, it is determined whether the suction pump operation amount C of the suction pump 62 is the maximum value Cmax. If it is Cmax, the process proceeds to step S7; otherwise, the process proceeds to S8, where the suction pump operation amount C is increased by a certain amount (ΔC), and the processing ends. In step S7, an alarm is generated and the process ends.
[0043]
On the other hand, in step S9, it is determined whether or not the water level measurement value of the water level gauge 85 is equal to or more than the upper limit Lmax. In the above case, the process proceeds to step S10 to reduce the filtration flux, and otherwise, the process ends. In step S10, it is determined whether the suction pump operation amount C of the suction pump 62 is the minimum value Cmin. If it is Cmin, the process proceeds to step S11; otherwise, the process proceeds to S12, where the suction pump operation amount C is reduced by a certain amount (ΔC), and the processing ends. In step S11, it is determined whether the operation amount B of the roughly separated suspension supply pump of the pump 54 is the minimum value Bmin. In the case of Bmin, the process proceeds to step S13, otherwise to S14, the operation amount B of the coarse separation suspension supply pump is reduced by a fixed amount (ΔB), and the processing is ended. In step S13, it is determined whether the motor operation amount A of the motor 66 is the minimum value Amin. In the case of Amin, the process is terminated. Otherwise, the process proceeds to S15, in which the motor operation amount A is reduced by a fixed amount (ΔA), and the process is terminated. This control flow is performed at regular intervals.
[0044]
As the operation amount B of the coarse separation suspension supply pump, the flow rate of the coarse separation suspension into the suspension vessel and / or the operation / stop time is adjusted. Further, the suction amount and / or the operation / stop time are adjusted as the suction pump operation amount C.
[0045]
According to this, when the filtration flux decreases, the number of rotations of the cleaning tool 68 is first increased to eliminate the membrane surface clogging substance, and the filtration flux is increased. If the predetermined filtration flux cannot be obtained even when the rotation speed is increased to the maximum, then the filtration pressure is increased by increasing the flow rate of the roughly separated suspension into the suspension vessel 65, and the filtration flow is increased. Increase bunch. If the predetermined filtration flux cannot be obtained even when the flow rate is increased to the maximum, the filtration pressure is increased by increasing the pump suction amount, and the filtration flux is increased. If a predetermined filtration flux cannot be obtained even when the suction amount is increased to the maximum, an alarm is generated.
[0046]
Since these operations can be performed without impairing the solid-liquid separation operation, the filtration flux can be continuously maintained. In addition, when the filtration flux is obtained more than necessary, the predetermined filtration flux can be maintained by performing the operation reverse to the above operation as described above.
[0047]
【The invention's effect】
Since the water quality measuring device according to the present invention can continuously perform a solid-liquid separation operation even with a mixed solution containing suspended matter such as activated sludge, it can supply only a clear sample stably, and has high accuracy and high reliability. Can be provided.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing an embodiment of a water quality measuring device according to the present invention.
FIG. 2 is a configuration diagram showing a membrane separation facility according to one embodiment.
FIG. 3 is a configuration diagram showing a membrane separation facility according to another embodiment.
FIG. 4 is a configuration diagram showing a cleaning tool of the membrane separation facility.
FIG. 5 is a configuration diagram for controlling the water quality measurement device.
FIG. 6 is a flowchart showing a control process of the control device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Biological reaction tank, 50 ... Coarse separation equipment, 51 ... Suspension supply pump, 52 ... Stirrer, 53 ... Network material, 54 ... Coarse separation suspension supply pump, 60 ... Membrane separation equipment, 62 ... Suction Pump, 64: Filtration container, 65: Suspension container, 66: Motor with reduction gear, 68: Cleaning tool, 69: Flat membrane, 80: Separation liquid storage equipment, 85: Water level gauge, 88: Control device, 90: Water quality Measuring equipment, 100: Water quality measuring device.

Claims (4)

A coarse separation facility for forming a first chamber and a second chamber with a mesh material, introducing a suspension into the first chamber and discharging the suspension from the second chamber, and a coarse separation suspension in the second chamber of the coarse separation facility A membrane separation facility through which a liquid is passed, suction means connected to the membrane separation facility for solid-liquid separation of the coarse separation suspension, and a separation fluid storage facility for temporarily storing a separated liquid from the membrane separation facility A water quality measuring device for measuring the water quality of the stored separated liquid. In claim 1,
The membrane separation equipment is of a cross flow type using a flat membrane, and has means for mechanically and continuously cleaning the membrane surface on the side of the coarse separation suspension. An apparatus for measuring water quality of a suspension, wherein the apparatus is refluxed to a second chamber of the facility. In claim 1 or 2,
In the membrane separation equipment, one set or a plurality of sets of filtration vessels and suspension vessels are alternately arranged via a flat membrane, and a cleaning tool that rotates in conjunction with a driving means provided outside these vessels is provided inside the suspension vessel. The coarse separation suspension is distributed and passed through each suspension vessel while washing each membrane surface directly, and solid-liquid separation is performed by the suction means connected to all the filtration vessels. Water quality measurement device for suspended liquids. A coarse separation facility for forming a first chamber and a second chamber with a mesh material, introducing a suspension into the first chamber and discharging the suspension from the second chamber, and a coarse separation suspension in the second chamber of the coarse separation facility A membrane separation facility through which a liquid is passed, suction means connected to the membrane separation facility for solid-liquid separation of the coarse separation suspension, and a separation fluid storage facility for temporarily storing a separated liquid from the membrane separation facility And, equipped with water quality measurement equipment to measure the water quality of the stored separated liquid,
A rotation speed adjustment mechanism that can adjust the rotation speed of the cleaning tool as a driving means of the membrane separation equipment; a suction amount adjustment mechanism that can adjust the suction amount of the separation liquid as the suction means; A water flow control mechanism capable of adjusting the water flow of the coarsely separated suspension, a water level meter for measuring the liquid level of the separated liquid in the separated liquid storage equipment, and A control device including a determination of a separation state is provided, and when the control device determines that the filtration flux is abnormal, the rotation speed adjusting mechanism, the suction amount adjusting mechanism, and the communication device maintain the predetermined filtration flux. An apparatus for measuring water quality of a suspension, wherein a water amount adjusting mechanism is controlled in a predetermined order.

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