A water collecting tank for a process wastewater supernatant detection system and a detection system

Abstract

The utility model provides a kind of water collecting tank for process wastewater supernatant detection system, comprising: water collecting tank water inlet, water collecting tank water outlet;The distance of water collecting tank water inlet and the bottom surface of water collecting tank is equal to 1 / 3 of water collecting tank height, the distance of water collecting tank water outlet and the top surface of water collecting tank is equal to 1 / 3 of water collecting tank height;First baffle and second baffle are arranged inside water collecting tank, second baffle top is higher than first baffle top, and water collecting tank is divided into first chamber, second chamber and third chamber;First baffle and the top surface of water collecting tank form first passage that is connected first chamber and second chamber;Second baffle and the bottom surface of water collecting tank form second passage that is connected second chamber and third chamber;Third chamber is supernatant detection area.The utility model optimizes the structure of water collecting tank, effectively precipitates large particle precipitate carried by supernatant, effectively filters and removes floating matter, and improves the accuracy of supernatant detection data.

Description

Technical Field

[0001] This utility model relates to the field of process wastewater detection technology, and in particular to a water collection tank and detection system for a process wastewater supernatant detection system. Background Technology

[0002] The discharge of supernatant from process wastewater (mainly including sludge discharge from sedimentation tanks and backwash water from sand filters) within the plant area must meet discharge standards. In existing technologies, a process wastewater supernatant detection system is used to monitor key indicators such as pollutant concentrations in the discharged supernatant.

[0003] like Figure 1 and Figure 2 As shown, in the existing process wastewater supernatant detection system, process wastewater is discharged to sludge thickening tank 100 through process wastewater pipe 102. Through the thickening effect of sludge thickening tank 100, large particles in the process wastewater are precipitated and concentrated to form supernatant. Supernatant flows out through thickening tank overflow port 101, and then flows naturally into underground sampling well 200 through supernatant drainage pipe 103, and then naturally into rainwater pumping station.

[0004] In the prior art, after the supernatant in the underground sampling well 200 is pumped to the collection tank 400 by the sampling pump 300, the water quality of the supernatant in the collection tank 400 is detected by the online detection instrument 500.

[0005] like Figure 2 As shown, the sampling pump outlet pipe 303 of the sampling pump 300 in the water collection tank 400 is connected to the water collection tank inlet 402, and the water collection tank outlet 403 is connected to the water collection tank outlet pipe 401. The supernatant in the water collection tank 400 is discharged through the outlet 403 to maintain the flowability of the supernatant and ensure the timeliness of the water quality test. The water collection tank 400 is equipped with a vent 404, which has a vent valve. When it is necessary to clean the water collection tank 400, it is cleaned through the vent 404.

[0006] In the prior art, during the process of the sampling pump 300 pumping the supernatant from the underground sampling well 200 to the collection tank 400 (during the process of collecting the supernatant in the collection tank 400), the water flow rate at the inlet 402 of the collection tank is relatively fast, causing the supernatant to tumble. Large particles of sediment carried by the supernatant cannot be effectively settled, and floating matter cannot be filtered out, which seriously affects the detection data of the online detection instrument 500, resulting in a large error value in the detection data.

[0007] like Figure 1As shown, the sampling pump inlet pipe 301 of the sampling pump 300 is connected to a basket-head check valve 302, which extends below the surface of the supernatant in the underground sampling well 200. When the sampling pump 300 is extracting the supernatant in the underground sampling well 200, the start and stop of the sampling pump 300 are controlled by a liquid level sensor in the underground sampling well 200 (not shown in the figure).

[0008] When the supernatant level in the underground sampling well 200 is lower than the level sensor control level, the sampling pump 300 stops working; when the supernatant level in the underground sampling well 200 is higher than the level sensor control level, the sampling pump 300 restarts.

[0009] However, due to the accumulation of silt, garbage, and large suspended particles in the underground sampling well 200, the basket head check valve 302 is often blocked, causing the basket head check valve 302 to fail to stop the water. When the sampling pump 300 stops working, the difference in liquid level between the sampling pump 300 and the supernatant in the underground sampling well 200 is large and the pipeline is long. The supernatant in the sampling pump inlet pipe 301 flows back into the underground sampling well 200, resulting in air in the sampling pump inlet pipe 301.

[0010] When the sampling pump 300 is restarted, because there is air in the sampling pump inlet pipe 301, the sampling pump 300 cannot form a negative pressure. The supernatant in the underground sampling well 200 cannot be pressurized by the sampling pump 300 and pumped to the collection tank 400. Moreover, the sampling pump 300 is prone to overheating and damage due to prolonged empty pumping. Utility Model Content

[0011] This utility model proposes a water collection tank and detection system for a process wastewater supernatant detection system to solve the technical problems of supernatant turbulence in the existing water collection tank, which affects the detection data of online detection instruments; blockage of the basket head check valve of the sampling pump, which prevents the basket head check valve from stopping water, causing the sampling pump to be unable to pump the supernatant in the underground sampling well to the water collection tank; and dry running of the sampling pump causing overheating and damage to the sampling pump.

[0012] One aspect of this utility model is to provide a water collection tank for a process wastewater supernatant detection system, including a water collection tank inlet and a water collection tank outlet.

[0013] The distance between the water inlet of the water collection tank and the bottom surface of the water collection tank is equal to 1 / 3 of the height of the water collection tank, and the distance between the water outlet of the water collection tank and the top surface of the water collection tank is equal to 1 / 3 of the height of the water collection tank.

[0014] The water collection tank is provided with a first partition and a second partition, with the top of the second partition being higher than the top of the first partition, thus dividing the interior of the water collection tank into a first chamber, a second chamber, and a third chamber.

[0015] The first partition and the top surface of the water collection tank form a first channel connecting the first chamber and the second chamber; the second partition and the bottom surface of the water collection tank form a second channel connecting the second chamber and the third chamber.

[0016] The third chamber is the supernatant detection area.

[0017] In a preferred embodiment, the water collection tank further includes a left side wall and a right side wall; the first partition is disposed at the middle position between the left side wall and the right side wall;

[0018] The second partition is located at the midpoint between the first partition and the right side wall.

[0019] In a preferred embodiment, the water collection tank further includes a front sidewall and a rear sidewall;

[0020] The first partition is sealed and welded to the front side wall, rear side wall and bottom surface of the water collection tank; the second partition is sealed and welded to the front side wall and rear side wall of the water collection tank.

[0021] In a preferred embodiment, the top of the second partition is 10 cm higher than the top of the first partition;

[0022] The height of the first channel formed by the first partition and the top surface of the water collection tank is 10cm, and the height of the second channel formed by the second partition and the bottom surface of the water collection tank is 8cm.

[0023] In a preferred embodiment, an vent is provided on the bottom surface of the water collection tank, in the region of the first chamber, and in the regions of the second and third chambers.

[0024] In a preferred embodiment, the water outlet of the water collection tank is connected to the water outlet pipe of the water collection tank for discharging the supernatant in the water collection tank.

[0025] Another aspect of this utility model is to provide a process wastewater supernatant detection system, the detection system including at least: an underground sampling well through which the supernatant of the process wastewater flows;

[0026] A sampling pump, comprising a sampling pump inlet pipe and a sampling pump outlet pipe, wherein the sampling pump inlet pipe extends below the surface of the supernatant in the underground sampling well;

[0027] A water collection tank, the water inlet of which is connected to the water outlet pipe of the sampling pump; the end of the water inlet pipe of the sampling pump is connected to a basket-head check valve;

[0028] A one-way valve is installed between the sampling pump inlet pipe and the basket head check valve to prevent the supernatant in the sampling pump inlet pipe from flowing back into the underground sampling well.

[0029] In a preferred embodiment, the one-way valve includes: a connecting section, a hemispherical check valve, a support sealing ring, a sealing ring, a nut, and a base;

[0030] The base is fixedly connected to the nut, the sealing ring is installed inside the nut, the supporting sealing ring is sleeved inside the sealing ring, the supporting sealing ring is movably connected to the hemispherical check valve, and the connecting section is threadedly connected to the nut.

[0031] The connecting section is connected to the inlet pipe of the sampling pump, and the base is connected to the basket head check valve;

[0032] When the sampling pump draws the supernatant, the supernatant pushes up the hemispherical check valve inside the one-way valve, and the one-way valve is opened.

[0033] When the sampling pump stops extracting the supernatant, the supernatant in the sampling pump inlet pipe presses the hemispherical check valve in the one-way valve onto the support sealing ring, and the one-way valve closes.

[0034] In a preferred embodiment, the detection system further includes a sludge thickening tank for thickening process wastewater to form a supernatant;

[0035] The sludge thickening tank includes a thickening tank overflow outlet; the thickening tank overflow outlet is connected to the underground sampling well through a supernatant drainage pipe, and is connected to the rainwater pumping station through the underground sampling well.

[0036] In a preferred embodiment, the detection system further includes an online detection instrument;

[0037] The online detection instrument is used to perform online detection of the supernatant in the third chamber.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] This utility model proposes a collection tank and detection system for a process wastewater supernatant detection system. Inside the collection tank, a first partition and a second partition are installed, with the top of the second partition higher than the top of the first partition, dividing the tank into a first chamber, a second chamber, and a third chamber. The first partition and the top surface of the collection tank form a first channel connecting the first and second chambers; the second partition and the bottom surface of the collection tank form a second channel connecting the second and third chambers. The third chamber is the supernatant detection area. When the sampling pump draws the supernatant from the underground sampling well into the collection tank, the supernatant first enters the first chamber through the tank inlet, where large particles of sediment carried by the supernatant are effectively settled. Then, the supernatant enters the second chamber through the first channel, where floating matter is blocked by the second partition, effectively filtering and removing floating matter. Finally, the supernatant enters the third chamber through the second channel, and an online detection instrument performs online detection of the supernatant in the third chamber. This invention optimizes the structure of the water collection tank, enabling the effective settling of large particles carried by the supernatant and the effective filtration and removal of floating matter, thereby reducing the error value of the detection data of the online detection instrument and improving the accuracy of the supernatant detection data.

[0040] This utility model proposes a water collection tank and detection system for a process wastewater supernatant detection system. A one-way valve is installed between the sampling pump inlet pipe and the basket head check valve. When the basket head check valve is blocked and cannot stop the water flow, the one-way valve can effectively prevent the supernatant in the sampling pump inlet pipe from flowing back into the underground sampling well, thus avoiding empty pipe in the sampling pump inlet pipe and preventing the sampling pump from running dry without medium, which would prevent the supernatant from being pumped into the water collection tank and damage the sampling pump. This provides a dual protection function. Attached Figure Description

[0041] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0042] Figure 1 This is a schematic diagram of a process wastewater supernatant detection system in the prior art.

[0043] Figure 2 This is a schematic diagram of the structure of a water collection tank in the prior art.

[0044] Figure 3 This is a schematic diagram of the structure of a process wastewater supernatant detection system according to the present invention.

[0045] Figure 4 This is an exploded view of the one-way valve of this utility model.

[0046] Figure 5 This is a structural schematic diagram of the water collection tank of this utility model. Detailed Implementation

[0047] To make the above and other features and advantages of this utility model clearer, the utility model will be further described below with reference to the accompanying drawings. It should be understood that the specific embodiments given herein are for the purpose of explanation to those skilled in the art, and are exemplary only, not restrictive.

[0048] Combination Figures 3 to 5 According to an embodiment of this utility model, a process wastewater supernatant detection system is provided. For example... Figure 3 As shown, the detection system includes a sludge thickening tank 100, an underground sampling well 200, a sampling pump 300, a water collection tank 400, and an online detection instrument 500.

[0049] The sludge thickening tank 100 is used to thicken process wastewater to form a supernatant. Specifically, the sludge thickening tank 100 includes a thickening tank overflow outlet 101, a process wastewater pipe 102, and a supernatant drainage pipe 103. The process wastewater pipe 102 is used to discharge process wastewater into the sludge thickening tank 100. The thickening tank overflow outlet 101 is connected to an underground sampling well 200 via the supernatant drainage pipe 103, and then connected to a rainwater pumping station via the underground sampling well 200.

[0050] like Figure 3 As shown, according to an embodiment of the present invention, the sampling pump 300 includes a sampling pump inlet pipe 301 and a sampling pump outlet pipe 303, and the sampling pump inlet pipe 301 extends into the underground sampling well 200 below the surface of the supernatant.

[0051] Specifically, the sampling pump inlet pipe 301 of the sampling pump 300 is connected to a basket head check valve 302, which extends into the underground sampling well 200 below the surface of the supernatant.

[0052] like Figure 3 As shown, according to an embodiment of the present invention, a one-way valve 304 is provided between the sampling pump inlet pipe 301 and the basket head check valve 302 to prevent the supernatant in the sampling pump inlet pipe 301 from flowing back into the underground sampling well 200.

[0053] like Figure 4 As shown, according to an embodiment of the present invention, the one-way valve 304 includes: a connecting section 3041, a hemispherical check valve 3042, a support sealing ring 3043, a sealing ring 3044, a nut 3045, and a base 3046.

[0054] The base 3046 is fixedly connected to the nut 3045. The sealing ring 3044 is installed inside the nut 3045. The supporting sealing ring 3043 is sleeved inside the sealing ring 3044. The supporting sealing ring 3043 is movably connected to the hemispherical check valve 3042. The connecting section 3041 is threadedly connected to the nut 3045.

[0055] The connecting section 3041 is connected to the sampling pump inlet pipe 301, and the base 3046 is connected to the basket head check valve 302, thereby setting a one-way valve 304 between the sampling pump inlet pipe 301 and the basket head check valve 302.

[0056] In one embodiment, the sampling pump inlet pipe 301 is first removed from the sampling pump 300, and the sampling pump inlet pipe 301 above the basket head check valve 302 is disconnected. At the disconnection point, the connecting section 3041 of the one-way valve 304 is connected to the sampling pump inlet pipe 301, and then the base 3046 of the one-way valve 304 is connected to the basket head check valve 302, thereby setting a one-way valve 304 between the sampling pump inlet pipe 301 and the basket head check valve 302. After that, the sampling pump inlet pipe 301 is installed back onto the sampling pump 300.

[0057] When the sampling pump 300 draws the supernatant, the supernatant pushes up the hemispherical check valve 3042 inside the one-way valve 304, and the one-way valve 304 is opened.

[0058] When the sampling pump 300 stops extracting the supernatant, the supernatant in the sampling pump inlet pipe 301 presses the hemispherical check valve 3042 in the one-way valve 304 onto the support sealing ring 3043, and the one-way valve 304 closes.

[0059] This utility model provides a one-way valve 304 between the sampling pump inlet pipe 301 and the basket head check valve 302. When the basket head check valve 302 is blocked and cannot stop the water flow (the valve core of the basket head check valve 302 is stuck and cannot be reset, resulting in the inability to stop the water flow), the one-way valve 304 can effectively prevent the supernatant in the sampling pump inlet pipe 301 from flowing back into the underground sampling well 200, thus avoiding empty pipes in the sampling pump inlet pipe 301 and preventing the sampling pump 300 from running dry without medium, which would prevent the supernatant from being pumped to the collection tank 400 and damage to the sampling pump 300. This provides a dual protection function.

[0060] Combination Figure 3 and Figure 5 According to an embodiment of this utility model, the water collection tank 400 includes a left side wall 407, a right side wall 408, a top surface 405, a bottom surface 406, a front side wall, and a rear side wall (the front and rear side walls are...). Figure 5 (Two side walls perpendicular to the paper surface), water inlet 402, water outlet 403 of the water collection tank.

[0061] Preferably, the left side wall 407, right side wall 408, bottom surface 406, front side wall, and rear side wall of the water collection tank 400 are made of 2mm stainless steel plate, and the top surface 405 is open. The left side wall 407, right side wall 408, bottom surface 406, front side wall, and rear side wall of the water collection tank 400 are welded to form a cuboid structure, and the joints must be properly sealed to ensure no leakage during use.

[0062] The inlet 402 of the water collection tank is connected to the outlet pipe 303 of the sampling pump. The outlet 403 of the water collection tank is connected to the outlet pipe 401 of the water collection tank, which is used to discharge the supernatant in the water collection tank 400. For example, the outlet 403 of the water collection tank is connected to the outlet pipe 401 of the water collection tank to discharge the supernatant in the water collection tank 400 to the rainwater pumping station.

[0063] like Figure 5 As shown, according to an embodiment of the present invention, the distance between the water inlet 402 of the water collection tank and the bottom surface 406 of the water collection tank 400 is equal to 1 / 3 of the height of the water collection tank 400, and the distance between the water outlet 403 of the water collection tank and the top surface 405 of the water collection tank 400 is equal to 1 / 3 of the height of the water collection tank 400.

[0064] A first partition 409 and a second partition 410 are provided inside the water collection tank 400, with the top of the second partition 410 being higher than the top of the first partition 409, dividing the interior of the water collection tank 400 into a first chamber A, a second chamber B, and a third chamber C. Preferably, the first partition 409 and the second partition 410 are made of 2mm stainless steel plate.

[0065] Furthermore, the first partition 409 is located at the midpoint between the left side wall 407 and the right side wall 408; the second partition 410 is located at the midpoint between the first partition 409 and the right side wall 408.

[0066] The first partition 409 is sealed and welded to the front side wall, rear side wall, and bottom surface 406 of the water collection tank 400. Specifically, the first partition 409 is fully welded to the three sides of the front side wall, rear side wall, and bottom surface 406 of the water collection tank 400 to prevent the supernatant from flowing from the first chamber A to the second chamber B through the missing weld.

[0067] The second partition 410 is sealed and welded to the front and rear side walls of the water collection tank 400. Specifically, the second partition 410 is fully welded to the two sides of the front and rear side walls of the water collection tank 400 to prevent the supernatant from flowing from the second chamber B to the third chamber C through the missing weld.

[0068] The first partition 409 and the top surface 405 of the water collection tank 400 form a first channel T1 connecting the first chamber A and the second chamber B. The second partition 410 and the bottom surface 406 of the water collection tank 400 form a second channel T2 connecting the second chamber B and the third chamber C. The third chamber C is the supernatant detection area.

[0069] In a preferred embodiment, the top of the second partition 410 is 10cm higher than the top of the first partition 409. The first channel T1 formed by the first partition 409 and the top surface 405 of the water collection tank 400 has a height of 10cm, and the second channel T2 formed by the second partition 410 and the bottom surface 406 of the water collection tank 400 has a height of 8cm.

[0070] like Figure 5 As shown, according to an embodiment of the present invention, an vent 404 is provided on the bottom surface 406 of the water collection tank 400, in the area of ​​the first chamber A, and in the areas of the second chamber B and the third chamber C, and an vent valve is provided on the vent 404.

[0071] Combination Figure 3 and Figure 5 According to an embodiment of the present invention, an online detection instrument 500 is used for online detection of the supernatant in the third chamber C.

[0072] Combination Figures 3 to 5 The working process of this utility model is as follows:

[0073] The process wastewater in the plant area is discharged to the sludge thickening tank 100 through the process wastewater pipe 102. Through the thickening effect of the sludge thickening tank 100, the large particles in the process wastewater are precipitated and concentrated to form the supernatant.

[0074] The supernatant flows out through the overflow port 101 of the concentration tank, and then flows naturally into the underground sampling well 200 through the supernatant drainage pipe 103, and then naturally into the rainwater pumping station.

[0075] The supernatant of the process wastewater flows through the underground sampling well 200. The sampling pump 300 pumps the supernatant in the underground sampling well 200 through the sampling pump inlet pipe 301 and then through the sampling pump outlet pipe 303 to the collection tank 400.

[0076] like Figure 5 As shown, during the process of sampling pump 300 pumping the supernatant from underground sampling well 200 to collection tank 400, the supernatant first enters the first chamber A through collection tank inlet 402, causing large particles carried by the supernatant to settle in the first chamber A. Then, the supernatant passes over the top of the first partition 409 and enters the second chamber B through the first channel T1. Floating debris on the upper layer of the supernatant is blocked by the second partition 410 in the second chamber B, filtering out the floating debris. Afterwards, the supernatant enters the third chamber C through the second channel T2, and online monitoring instrument 500 performs online monitoring of the supernatant in the third chamber C.

[0077] The supernatant in the collection tank 400 is discharged through the collection tank outlet pipe 401 connected to the collection tank outlet 403, for example, to a rainwater pumping station. The supernatant enters through the collection tank inlet 402 and flows out through the collection tank outlet 403, maintaining the flowability of the supernatant and ensuring the timeliness of supernatant water quality testing. When the collection tank 400 needs to be cleaned, it is cleaned through the vent 404.

[0078] In this invention, during the process of the sampling pump 300 pumping the supernatant from the underground sampling well 200 to the collection tank 400, large particles carried by the supernatant are effectively precipitated in the first chamber A, and floating matter is blocked by the second partition 410 in the second chamber B, effectively filtering and removing floating matter. The online monitoring instrument 500 performs online monitoring of the supernatant in the third chamber C. This invention optimizes the structure of the collection tank 400, dividing its interior into three chambers, enabling effective precipitation of large particles carried by the supernatant and effective filtration and removal of floating matter, reducing the error value of the detection data from the online monitoring instrument 500, and improving the accuracy of the supernatant detection data.

[0079] This utility model provides a one-way valve 304 between the sampling pump inlet pipe 301 and the basket head check valve 302. When the basket head check valve 302 is blocked and cannot stop the water flow, the one-way valve 304 can effectively prevent the supernatant in the sampling pump inlet pipe 301 from flowing back into the underground sampling well 200, thus avoiding empty pipes in the sampling pump inlet pipe 301 and preventing the sampling pump 300 from running dry without medium, which would prevent the supernatant from being pumped to the collection tank 400 and damage to the sampling pump 300. This provides a dual protection.

[0080] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A collection tank for a process wastewater supernatant detection system, characterized in that, The water collection tank includes a water collection tank inlet and a water collection tank outlet; The distance between the water inlet of the water collection tank and the bottom surface of the water collection tank is equal to 1 / 3 of the height of the water collection tank, and the distance between the water outlet of the water collection tank and the top surface of the water collection tank is equal to 1 / 3 of the height of the water collection tank. The water collection tank is provided with a first partition and a second partition, with the top of the second partition being higher than the top of the first partition, thus dividing the interior of the water collection tank into a first chamber, a second chamber, and a third chamber. The first partition and the top surface of the water collection tank form a first channel connecting the first chamber and the second chamber; the second partition and the bottom surface of the water collection tank form a second channel connecting the second chamber and the third chamber. The third chamber is the supernatant detection area.

2. The water collection tank according to claim 1, characterized in that, The water collection tank also includes a left side wall and a right side wall; the first partition is located at the middle position between the left side wall and the right side wall; The second partition is located at the midpoint between the first partition and the right side wall.

3. The water collection tank according to claim 1, characterized in that, The water collection tank also includes a front side wall and a rear side wall; The first partition is sealed and welded to the front side wall, rear side wall and bottom surface of the water collection tank; the second partition is sealed and welded to the front side wall and rear side wall of the water collection tank.

4. The water collection tank according to claim 1, characterized in that, The top of the second partition is 10cm higher than the top of the first partition; The height of the first channel formed by the first partition and the top surface of the water collection tank is 10cm, and the height of the second channel formed by the second partition and the bottom surface of the water collection tank is 8cm.

5. The water collection tank according to claim 1, characterized in that, An vent is provided on the bottom surface of the water collection tank, in the area of ​​the first chamber, and in the areas of the second and third chambers.

6. The water collection tank according to claim 1, characterized in that, The outlet of the water collection tank is connected to the water collection tank outlet pipe, which is used to discharge the supernatant in the water collection tank.

7. A system for detecting supernatant from process wastewater, characterized in that, The detection system includes at least: an underground sampling well through which the supernatant of the process wastewater flows; A sampling pump, comprising a sampling pump inlet pipe and a sampling pump outlet pipe, wherein the sampling pump inlet pipe extends below the surface of the supernatant in the underground sampling well; And the water collection tank according to any one of claims 1 to 6, wherein the water inlet of the water collection tank is connected to the water outlet pipe of the sampling pump; The sampling pump is connected to a basket head check valve at the end of its inlet pipe. A one-way valve is installed between the sampling pump inlet pipe and the basket head check valve to prevent the supernatant in the sampling pump inlet pipe from flowing back into the underground sampling well.

8. The detection system according to claim 7, characterized in that, The one-way valve includes: a connecting section, a hemispherical check valve, a support sealing ring, a sealing ring, a nut, and a base; The base is fixedly connected to the nut, the sealing ring is installed inside the nut, the supporting sealing ring is sleeved inside the sealing ring, the supporting sealing ring is movably connected to the hemispherical check valve, and the connecting section is threadedly connected to the nut. The connecting section is connected to the inlet pipe of the sampling pump, and the base is connected to the basket head check valve; When the sampling pump draws the supernatant, the supernatant pushes up the hemispherical check valve inside the one-way valve, and the one-way valve is opened. When the sampling pump stops extracting the supernatant, the supernatant in the sampling pump inlet pipe presses the hemispherical check valve in the one-way valve onto the support sealing ring, and the one-way valve closes.

9. The detection system according to claim 7, characterized in that, The detection system also includes a sludge thickening tank, used to thicken the process wastewater to form a supernatant; The sludge thickening tank includes a thickening tank overflow outlet; the thickening tank overflow outlet is connected to the underground sampling well through a supernatant drainage pipe, and is connected to the rainwater pumping station through the underground sampling well.

10. The detection system according to claim 7, characterized in that, The detection system also includes online detection instruments; The online detection instrument is used to perform online detection of the supernatant in the third chamber.

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