JP6411623B1 - Water sampling equipment - Google Patents

Abstract

A water sampling apparatus having a function of preventing clogging of a water sampling pipe is provided. In the water sampling devices 80, 80a, the discharge port (nozzle 34b) of the water sampling pipe 34 is positioned above the liquid level of the membrane separation tank 30 and the biological treatment tank 20. Further, the water sampling pump means 34a is intermittently operated. Thereby, when the water sampling pump means 34a is stopped, the residual water in the water sampling pipe 34 flows back to the treatment tank (biological treatment tank 20 in this example) side of the water treatment facility 100 by its own weight, thereby backwashing the water sampling pipe 34 Is done. Then, impurities and the like attached in the water sampling pipe 34 are detached by this regular backwashing, and the water sampling pipe 34 can be prevented from being clogged. Further, the water sampling devices 80 and 80a close the on-off valve 38 and stop the backflow of the residual water before all the backflow of the residual water is completed. Thereby, the water supply load at the time of a restart can be reduced. [Selection] Figure 1

Description

  The present invention relates to a water sampling apparatus for supplying test water to a measuring device that automatically measures the water quality of a water treatment facility.

  Currently, the national sewage treatment population penetration rate by sewers, agricultural settlement drainage facilities and septic tanks is over 90%, and in the social situation where the population is decreasing in the future, more efficient operation of water treatment facilities is possible. It has been demanded. Regarding this problem, for example, in the following [Patent Document 1], a part of the concentrated sludge is returned to the biological treatment tank or the adjustment tank located in the preceding stage of the biological treatment tank, and surplus sludge is obtained using Bacillus bacteria in the concentrated sludge. An invention for reducing the volume and reducing bad odor is described.

  In addition, the treatment of domestic wastewater requires nitrogen treatment by oxidation of ammonia and denitrification of nitric acid in addition to decomposition of organic matter, and as described in [Patent Document 1], aerobic by aeration. Biological treatment under conditions is widely performed. However, the power consumption of the blower for aeration occupies about one-quarter to one-half of the whole, and power saving through proper operation of the blower is an important issue for efficient operation of water treatment facilities. It has become. In response to this problem, water treatment facilities that automatically measure the water quality of biological treatment tanks (aeration tanks) and appropriately operate the blowers based on the measurement results tend to increase power consumption.

  As one of such automatic water quality measurement methods, for example, as described in [Patent Document 2] below, a water quality sensor is installed on the path of a water treatment facility, and a blower or the like is determined by the measured value of the water quality sensor. A method of controlling the operation of each part of the above is conceivable. However, this method requires a water quality sensor for each measurement location, complicating the system configuration, and may increase the equipment cost.

  In response to this problem, for example, the treated water in the biological treatment tank is filtered (membrane separated) using a separation membrane or the like, and the filtrate is sent as a test water to a measuring device to set the concentration of dissolved substances in the treated water to a predetermined level. A measuring apparatus that automatically measures at a time interval of is in practical use. In the configuration using this separation membrane, it is possible to automatically measure water quality with a relatively simple device configuration. However, since a certain amount of suction force is required to perform membrane separation, the test pipe for feeding the test water cannot be made long, and it is difficult to install the separation membrane and the measuring device apart from each other. For this reason, when installing a separation membrane directly in a processing tank, it is necessary to arrange | position a measuring instrument also near a processing tank, and the freedom degree of an apparatus structure is restrict | limited. In response to this problem, a membrane separation tank is provided separately from the tank of the water treatment facility, and the separation membrane is installed in the membrane separation tank and the water in the treatment tank (biological treatment tank) is supplied together with the activated sludge. A configuration in which membrane separation is performed in a separation tank is conceivable. In this configuration, since the test water is obtained from the membrane separation tank independent from the path of the water treatment facility, the degree of freedom of the installation location of the measuring device is high, and it can be relatively easily installed in the existing water treatment facility.

JP 2005-296852 A JP2013-202511A

  However, since the membrane separation tank is a tank provided for collecting water for water quality measurement, the capacity is generally small, and the diameter of the water collection pipe for supplying treated water to this is also small. In addition, since activated sludge containing contaminants such as hair is mixed in the treatment water of the biological treatment tank, there is a problem that it is easy to clog with a small-diameter sampling tube and it is difficult to stably supply water for a long period of time. .

  This invention is made | formed in view of the said situation, and aims at provision of the water sampling apparatus provided with the clogging prevention function of a water sampling pipe | tube.

The present invention
(1) A separation membrane 32 for performing solid-liquid separation, a membrane separation tank 30 in which the separation membrane 32 is installed, and treated water in a predetermined treatment tank (biological treatment tank 20) of the water treatment facility 100 are supplied to the membrane separation tank. A water sampling pipe 34 to be supplied to 30, a water sampling pump means 34 a for supplying treated water to the water sampling pipe 34, and a water sampling pipe 36 for supplying the water sample passing through the separation membrane 32 to the measuring instrument 10. In the water device,
The discharge port (nozzle 34b) of the water sampling pipe 34 is located above the liquid level of the membrane separation tank 30 and the processing tank and has an opening / closing valve 38 on the water intake side of the water sampling pipe 34,
The water sampling pump means 34a operates intermittently, and the on- off valve 38 is closed after the water sampling pump means 34a is stopped and before the backflow of the treated water remaining in the water sampling pipe 34 to the treatment tank is completed. The above problems are solved by providing the water sampling devices 80 and 80a which are characterized by operation.
( 2 ) a second water sampling pipe 44 that sends treated water from other treatment tanks of the water treatment facility 100 to the test pipe 36;
Flow path switching means 48 for switching the flow path of the test water to the measuring device 10 between the second water collection pipe 44 side and the separation membrane 32 side;
The flow path switching means 48 switches the sample flow path to the separation membrane 32 side when the water sampling pump means 34a is operated, and switches to the second water sampling pipe 44 side when the water sampling pump means 34a is stopped. The above problem is solved by providing the water sampling device 80a described in (1), which is characterized.

  In the water sampling apparatus according to the present invention, the discharge port of the water sampling pipe is positioned above the liquid level of the membrane separation tank and the tank for taking water, and the water sampling pump means is intermittently operated. Thereby, when the water sampling pump means is stopped, the residual water in the water sampling pipe flows back to the tank side where water is taken up by its own weight, thereby backwashing the water sampling pipe. And this regular backwashing can prevent clogging of the water sampling pipe. Moreover, the water sampling apparatus which concerns on this invention closes an on-off valve, and stops the backflow of residual water before all the backflow of residual water is completed. Thereby, the water supply load at the time of a restart can be reduced.

It is a figure explaining the water sampling apparatus which concerns on this invention. It is a figure explaining the 2nd water sampling apparatus which concerns on this invention.

  A water sampling apparatus according to the present invention will be described with reference to the drawings. First, the water treatment facility 100 to which the present invention is applied will be described. In addition, although it demonstrates using the water treatment facility 100 which purifies domestic wastewater and discharges it to a river etc. here, the water treatment facility 100 to which this invention is applied is not limited to this, For example, water supply It can be applied to any water treatment facility that requires solid-liquid separation from impurities, such as water treatment facilities for industrial wastewater, water purification facilities such as pools, hot springs, and warm bath facilities. In addition, the water collecting tank can be appropriately selected depending on the purpose and measurement item. Especially when the purpose is to operate the blower 14 appropriately, the treatment of the biological treatment tank 20 (aeration tank) is performed as shown in this example. It is preferable to collect water.

  Here, the water treatment facility 100 suitable for the present invention includes, for example, an adjustment tank 22 that temporarily stores drainage or the like and adjusts the amount and quality of water, and stores the raw water supplied from the adjustment tank 22 and aerated by the blower 14. A biological treatment tank 20 that performs biological treatment such as organic matter decomposition by aerobic bacteria, nitrification of ammonia, and denitrification under anaerobic conditions, and solids such as activated sludge by leaving the treated water in this biological treatment tank 20 A sedimentation tank 26 for precipitating and solid-liquid separation, a disinfection tank 28 for administering a disinfectant such as sodium hypochlorite to the supernatant of the precipitation tank 26, and a blower control unit 12 for controlling the operation of the blower 14. , At least.

  And the water sampling apparatus 80 which concerns on this invention solid-liquid-separates the water of the predetermined processing tank of the water treatment facility 100, and supplies it to the measuring apparatus 10, and the separation membrane 32 which performs solid-liquid separation of treated water, The membrane separation tank 30 in which the separation membrane 32 is installed, the water collection pipe 34 that supplies the treated water in a predetermined treatment tank of the water treatment facility 100 to the membrane separation tank 30, and the treated water is sent to the water collection pipe 34. A water sampling pump means 34 a, a water sampling pipe 36 that supplies the test water that has passed through the separation membrane 32 to the measuring device 10, a suction pump means 36 a that supplies water to this water sampling pipe 36, and a water intake side of the water sampling pipe 34 ( An on-off valve 38 provided on the treatment tank side of the water treatment facility 100, an overflow pipe 40 for returning surplus treated water from the membrane separation tank 30 to a predetermined tank of the water treatment facility 100, and a water sampling pump means 34a. Intermittent operation and open / close valve 38 It has a water sampling control unit (not shown) Gosuru, the.

  Next, the structure of each part of the water sampling apparatus 80 which concerns on this invention is demonstrated. First, as the water sampling pump means 34a, a well-known pump means capable of pumping the treated water in the treatment tank together with the impurities can be used. In particular, when the treatment tank is the biological treatment tank 20, it is preferable to feed the treated water together with the activated sludge using a sewage submersible pump. Further, the water sampling pipe 34 feeds treated water taken by the water sampling pump means 34a together with impurities such as activated sludge to the membrane separation tank 30, and a well-known pipe or hose made of synthetic resin or metal is used. it can. Among these, it is particularly preferable that the hose and pipe made of synthetic resin having a diameter of about 10A to 50A are appropriately combined. Moreover, it is preferable to provide the nozzle 34b in the discharge port of the water sampling pipe 34, and to fix the flow volume of the water sampling pipe 34 to an appropriate value by optimizing the diameter of this nozzle 34b. The flow rate of the water sampling pipe 34 is basically set by the diameter of the nozzle 34b as described above, and no flow rate adjusting mechanism such as a variable valve is provided. Here, when the flow rate adjusting mechanism is provided in the water sampling pipe 34, the narrow portion of the flow rate adjusting mechanism is likely to be clogged with impurities in the treated water, and stable water supply is difficult. For this reason, in the water sampling apparatus 80 which concerns on this invention, a flow volume is determined by the aperture of the nozzle 34b, and it is set as the structure which does not provide the conspicuous narrow part on the path | route of the water sampling pipe 34. If there is no conspicuous narrow portion, a nozzle 34b having a variable diameter may be used. The discharge port (nozzle 34b) is positioned above the liquid level of the membrane separation tank 30 and the treatment tank (biological treatment tank 20). Thereby, when the water collection pump means 34a is stopped, the treated water remaining in the water collection pipe 34 flows back to the treatment tank (biological treatment tank 20) by its own weight.

  An on-off valve 38 is provided on the water intake side (treatment tank side) of the water sampling pipe 34. The on-off valve 38 may be a known on-off valve that can be opened and closed by the water sampling control unit. The on-off valve 38 preferably uses a structure having no conspicuous narrow portion inside.

  In addition, the membrane separation tank 30 is disposed in the vicinity of the measuring device 10, has a separation membrane 32 in the tank, and is supplied with treated water from the water treatment facility 100 via a water sampling pipe 34. In addition, when supplying the treated water of the biological treatment tank 20 to the membrane separation tank 30, it is preferable to provide an aeration mechanism also in the membrane separation tank 30. Further, the membrane separation tank 30 has an overflow pipe 40 for returning surplus treated water (hereinafter referred to as surplus water) to a predetermined tank of the water treatment facility 100. In addition, when supplying the treated water of the biological treatment tank 20 to the membrane separation tank 30, the surplus water is returned together with the activated sludge to the biological treatment tank 20 or the adjustment tank 22 shown in FIG. It is preferable to do. Among these, especially in the structure which returns to the adjustment tank 22, since the aerobic microbe activated in the biological treatment tank 20 is returned to the adjustment tank 22 located upstream, the biological treatment in the latter biological treatment tank 20 is more effectively performed. It can be carried out. Thereby, favorable effects, such as prevention of malodor, volume reduction of sludge, and improvement of the quality of treated water, can be obtained. The amount of surplus water returned to the adjustment tank 22 is preferably 5% to 15% of the flow rate of the water treatment facility 100, and particularly preferably 8% to 12%. When the flow rate is less than 5%, the return amount of surplus water is small and the effect of improving biological treatment is small. On the other hand, if it exceeds 15%, the return amount becomes excessive and the treatment capacity of the water treatment facility 100 as a whole deteriorates. In addition, since the amount of test water sent from the membrane separation tank 30 to the measuring device 10 is as small as about 1% to 2% of the amount of treated water supplied to the membrane separation tank 30, the amount of treated water supplied and the overflow pipe The amount returned by 40 is almost the same.

  When the capacity of the sampling pump means 34a is excessive with respect to the supply amount of treated water, a return pipe 34c is provided between the on-off valve 38 and the sampling pump means 34a to biologically treat excess treated water. You may make it return to the tank 20. FIG. In this configuration, the supply amount of the treated water can be adjusted by both the diameter of the nozzle 34b and the diameter of the return pipe 34c, so that the supply amount can be easily adjusted and the load on the water sampling pump means 34a can be reduced.

  Further, any separation membrane 32 installed in the membrane separation tank 30 may be used as long as the solid-liquid separation sufficient for the measurement of the measuring device 10 can be performed. When the separation membrane 32 is used for separating activated sludge, it is preferable to use an MF membrane (microfiltration membrane). In particular, it is possible to use a flat plate filtration unit in which MF membranes are fixed to both planes of a frame having a suction port, and to connect a test tube 36 to the suction port of the flat plate filtration unit. To most preferred.

  The suction pump means 36a may be a known liquid feed pump having a predetermined suction capability. Further, the pipe length of the test water pipe 36 is set to a length that can sufficiently perform the water supply and membrane separation of the test water by the suction force of the suction pump means 36a.

Moreover, the measurement apparatus 10 connected with the water sampling apparatus 80 can use the known measurement apparatus which can measure the target measurement item automatically. Here, the measuring device 10 is used to measure NH ₄ —N (ammonia nitrogen) concentration and NO x —N (nitric acid / nitrite nitrogen) concentration in water.

  Next, the operation of the water sampling apparatus 80 according to the present invention will be described. First, domestic wastewater (raw water) flows into the adjustment tank 22. Then, the flow rate, concentration, pH, etc. of the raw water are adjusted in the adjustment tank 22. Next, the raw water flows into the biological treatment tank 20. In the biological treatment tank 20, the blower 14 is intermittently operated by the blower control unit 12 at predetermined time intervals. When the blower 14 is operated, aeration is performed and the inside of the tank is in an aerobic state. Thereby, the aerobic bacteria and microorganisms in the biological treatment tank 20 decompose organic substances in the treated water and nitrify ammonia. Further, when the blower 14 is stopped, the inside of the tank becomes anaerobic, and the denitrifying bacteria in the tank denitrify nitric acid. And by performing these alternately, the biological treatment with respect to treated water is performed. Although the time interval of intermittent operation of the blower 14 varies depending on the capacity of the water treatment facility 100 and inflowing wastewater, it is generally 30 minutes to 2 hours, and is generally 45 minutes to 1 hour. Then, the treated water biologically treated in the biological treatment tank 20 flows into the sedimentation tank 26 and is left still. Thereby, solid substances, such as activated sludge, settle down and solid-liquid separation is performed. Next, the supernatant of the sedimentation tank 26 flows into the disinfection tank 28. In the sterilization tank 28, a predetermined amount of sterilizing agent is added by, for example, the sterilizing agent adding device 28a, and sterilization processing of the treated water is performed. Then, the sterilized treated water is discharged into a river or the like.

  In parallel with this, the water collection pump means 34 a takes the treated water in the biological treatment tank 20 together with the activated sludge and pumps it through the water collection pipe 34. Then, the treated water is discharged from the nozzle 34 b to the membrane separation tank 30 through the water collection pipe 34. The surplus water in the membrane separation tank 30 is returned to, for example, the adjustment tank 22 via the overflow pipe 40. Further, the suction pump means 36a is operated to suck the sample water in the frame from the suction port of the flat plate filtration unit, for example. Due to the suction of the test water, new treated water flows from the separation membrane 32 of the flat plate filtration unit into the frame. At this time, solids such as activated sludge cannot pass through the separation membrane 32, and thus membrane separation (filtration) is performed.

Further, the sample water sucked by the suction pump means 36a is supplied to the measuring device 10 through the sample tube 36, and predetermined water quality measurement such as NH ₄ -N concentration and NOx-N concentration is performed in the measuring device 10. The measuring device 10 outputs the measurement result to the blower control unit 12 and records it on a predetermined recording medium. Incidentally, the measured water after the measurement is drained into the overflow pipe 40, for example.

  The blower control unit 12 changes the air volume (aeration volume) of the blower 14 based on the measurement result from the measuring device 10. For example, when the measurement value of the measuring device 10 is a value indicating deterioration of water quality, the blower control unit 12 increases the air volume of the blower 14 and promotes biological treatment. Moreover, when the measured value of the measuring device 10 is excellent, the blower control unit 12 reduces the air volume of the blower 14 to reduce power consumption. Thereby, the blower 14 operates with an appropriate power consumption capable of maintaining the biological treatment in a good state. Thereby, power consumption can be suppressed and reduction in power cost can be achieved.

  Next, the characteristic operation of the water sampling apparatus 80 according to the present invention will be described. First, the water sampling control unit performs intermittent operation by controlling on / off of the water sampling pump means 34a. The interval of the intermittent operation of the water sampling pump means 34a may be substantially equal to the interval of the intermittent operation of the blower 14, or may be a different independent time interval. The water sampling control unit may turn on / off the suction pump unit 36a simultaneously with turning on / off the water sampling pump unit 34a. In this configuration, the supply of the sample water to the measuring device 10 is stopped simultaneously with the stop of the water sampling pump means 34a.

  And if a water sampling control part turns off the water sampling pump means 34a, supply of the treated water to the membrane separation tank 30 will stop. At this time, since the discharge port (nozzle 34b) of the water sampling pipe 34 is located above the liquid level of the membrane separation tank 30 and the biological treatment tank 20, the treated water remaining in the water sampling pipe 34 (hereinafter referred to as residual water). ) Flows backward to the biological treatment tank 20 by its own weight. As a result, the water collection pipe 34 is back-washed, and even if sludge or impurities are caught in the water collection pipe 34, it can be removed. However, if all of the backflow is completed and the residual water in the water sampling pipe 34 is discharged to the liquid level of the treatment tank, the water supply load is large when the water sampling pump means 34a is restarted, and the pipe length of the water sampling pipe 34 is particularly large. There is a possibility that problems such as water supply and increased power consumption may occur when the length is long. Therefore, the water sampling control unit closes the on-off valve 38 after a predetermined time interval after the water sampling pump unit 34a is stopped. Thereby, the backflow of residual water stops. The predetermined time interval at this time is a time until the backflow of the residual water is completed, for example, a time for discharging 10% to 50% of the residual water. It is preferable to obtain and set the time interval at which the on-off valve 38 operates by measuring in advance, for example, when the water sampling device 80 is installed. And in this structure, since all the residual water in the water sampling pipe 34 cannot escape, the water supply load at the time of re-operation of the water sampling pump means 34a can be reduced, and the malfunction of water supply etc. can be prevented.

  Next, when the predetermined stop period ends, the water sampling control unit opens the on-off valve 38 and turns on the water sampling pump means 34a and the suction pump means 36a. Thereby, the water sampling pump means 34 a pumps the treated water of the biological treatment tank 20 to the water sampling pipe 34 and supplies it to the membrane separation tank 30. The suction pump means 36 a sucks the sample water and supplies it to the measuring device 10. Then, the membrane separation by the separation membrane 32 and the measurement of the test water by the measuring device 10 are resumed.

  Next, the 2nd water sampling apparatus 80a which concerns on this invention is demonstrated using FIG. The second water sampling apparatus 80a according to the present invention includes a second water sampling pipe 44 that sends the treated water in another processing tank of the water treatment facility 100, for example, the disinfection tank 28 to the water sampling pipe 36 as the test water, and the measuring device 10 It further has a flow path switching means 48 for switching the flow path of the sample water between the second water sampling tube 44 side and the separation membrane 30 side. As the flow path switching means 48, a well-known three-way valve, a switching valve or the like that can be switched by the water sampling control unit can be used. And the water sampling control part switches the flow path of the flow path switching means 48 to the separation membrane 32 side at the time of operation | movement of the water sampling pump means 34a. Thereby, the test water supplied to the measuring instrument 10 becomes the drainage of the biological treatment tank 20 that has passed through the separation membrane 32. When the water sampling pump means 34a is stopped, the flow path of the flow path switching means 48 is switched to the second water sampling pipe 44 side. Thereby, the test water supplied to the measuring device 10 becomes the treated water in the disinfection tank 28, that is, treated water discharged by the water treatment facility 100. Then, the measuring device 10 measures and records the treated water in the sterilization tank 28, and takes appropriate measures such as issuing a warning to the administrator if an abnormality exists. In the second water sampling apparatus 80a, the suction pump means 36a always operates regardless of whether the blower 14 is on or off.

  And in this 2nd water sampling apparatus 80a, the water quality measurement of the disinfection tank 28 is performed while the water sampling pump means 34a is stopped. For this reason, the water quality measurement of the two tanks of the water treatment facility 100 can be performed alternately.

  As described above, the water sampling devices 80 and 80 a according to the present invention position the discharge port (nozzle 34 b) of the water sampling pipe 34 above the liquid level of the membrane separation tank 30 and the biological treatment tank 20. Further, the water sampling pump means 34a is intermittently operated. Thereby, when the water sampling pump means 34a is stopped, the residual water in the water sampling pipe 34 flows back to the treatment tank (biological treatment tank 20 in this example) side of the water treatment facility 100 by its own weight, thereby backwashing the water sampling pipe 34 Is done. Then, impurities and the like attached in the water sampling pipe 34 are detached by this regular backwashing, and the water sampling pipe 34 can be prevented from being clogged. Furthermore, the water sampling devices 80 and 80a according to the present invention close the on-off valve 38 and stop the backflow of the residual water before all the backflow of the residual water is completed. Thereby, the water supply load at the time of re-operation is reduced, and the malfunction of water supply etc. can be prevented.

  In addition, the water sampling devices 80 and 80 a according to the present invention are provided with a membrane separation tank 30 independent from the path of the water treatment facility 100, and feed water from the membrane separation tank 30 to the measuring device 10. Thereby, continuous and stable water supply of test water can be performed. In addition, it is possible to perform highly reliable water quality measurement using the measuring device 10. Furthermore, maintenance of the separation membrane 32 and the measuring device 10 can be easily performed.

  Furthermore, in the water sampling devices 80 and 80a according to the present invention, the water sampling pipe 34, the membrane separation tank 30, and the overflow pipe 40 constitute a reflux path for the water treatment facility 100. For this reason, when the water treatment facility 100 has the biological treatment tank 20, the return amount (the amount of treated water supplied to the membrane separation tank 30) is optimized, and the taken activated sludge is upstream of the biological treatment tank 20. The processing efficiency in the biological treatment tank 20 can be improved by returning it to the tank.

  In addition, since the structure, mechanism, operation | movement, piping path | route, etc. of each part of the water sampling apparatus 80, 80a shown in this example and the water treatment facility 100 are examples, it is not necessarily limited to this example, and this invention is Modifications can be made without departing from the scope of the present invention. Moreover, the water sampling devices 80 and 80a according to the present invention can be applied not only to the water treatment facility 100 having the biological treatment tank 20, but also to any water treatment facility 100 that requires solid-liquid separation of test water.

10 Measuring equipment
20 Biological treatment tank (treatment tank)
30 Membrane separation tank
32 Separation membrane
34 Water sampling pipe
34a Water sampling pump means
34b Nozzle (discharge port)
36 Test tube
38 On-off valve
44 Second sampling pipe
48 Channel switching means
80, 80a Water sampling device
100 Water treatment facility

Claims (2)

A separation membrane that performs solid-liquid separation, a membrane separation tank in which the separation membrane is installed, a water collection pipe that supplies treated water from a predetermined treatment tank of a water treatment facility to the membrane separation tank, and treated water in the water collection pipe In a water sampling apparatus having a water sampling pump means for supplying water, and a water sampling pipe for supplying water to the measuring instrument through the separation membrane,
The discharge port of the water sampling pipe is located above the liquid level of the membrane separation tank and the processing tank and has an open / close valve on the water intake side of the water sampling pipe,
The water sampling pump means is operated intermittently, and after the water sampling pump means is stopped , the on- off valve is closed before the backflow of the treated water remaining in the water sampling pipe to the treatment tank is completed. Characteristic water sampling device. A second water collection pipe that sends treated water from other treatment tanks of the water treatment facility to the test pipe;
A flow path switching means for switching the flow path of the test water to the measurement device between the second water collection pipe side and the separation membrane side,
With switching on the separation membrane side during operation of the passage switching means water sampling pump means the flow path of the test water, claims wherein the time of stopping the water sampling pump unit and switches to the second water sampling pipe side The water sampling apparatus according to 1 .

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