Multi-point monitoring device and system for sewage treatment process

Abstract

The invention discloses a multi-point monitoring device and system for a sewage treatment process, and relates to the technical field of sewage monitoring. A multi-point monitoring device for a sewage treatment process comprises a disc rotationally connected with a turntable, and further comprises a plurality of suction pipes which are circumferentially mounted on the disc respectively; according to the device and the system, through dual-mode cleaning of a gas back-flushing pipe and water flushing, the residual quantity in the suction pipes and the intubation pipe can be further reduced, cross contamination is effectively avoided, the multiple suction pipes are separately arranged and are independently connected with the intubation pipe, cross mixing of residual liquid is further reduced, and the accuracy of a water sample during water sample collection is improved; according to water sample detection data of each time, a proper cleaning mode can be automatically matched, the detection efficiency can be improved, meanwhile, the cost can be reduced, chemical cleaning is replaced with a physical cleaning mode, use of chemical reagents can be reduced, and meanwhile whether the cleaning wire is broken or not can be judged according to data comparison.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage monitoring, and in particular relates to a multi-point monitoring device used in a sewage treatment process. Background Art

[0002] In the sewage treatment process, anaerobic tanks, aerobic tanks, anoxic tanks, sedimentation tanks and other water tanks constitute the core units of biological treatment. The real-time monitoring of their water quality parameters is directly related to the process control effect. Therefore, how to accurately obtain water quality parameters is a crucial task in the sewage treatment process. In the prior art, a water quality monitoring system for multiple treatment pools is implemented by placing a water pump in each of the multiple treatment pools. An electric valve is installed on each water pump to control the opening and closing of the water pump. The multiple water pumps are connected to the sampling tube, and a pump body is connected to the sampling tube. When it is necessary to pump water from a treatment pool, the electric valve on the water pump is opened and the pump body is started, and the water in the treatment pool can be pumped out and discharged into the online monitoring instrument for detection. The water sample after detection can be discharged (refer to the attached figure). Figure 4 ); However, the above technical solution has defects. Since multiple pumping pipes are connected to one sampling pipe, when water is pumped through a certain pumping pipe, the pumped water will mix with the residual water in other pumping pipes and the sampling pipe, resulting in inaccurate pumped water samples. For this reason, a multi-point monitoring device for sewage treatment process is proposed. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a multi-point monitoring device for a sewage treatment process that can overcome the above problems or at least partially solve the above problems.

[0004] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is: a multi-point monitoring device for sewage treatment process, including a disc rotatably connected to a turntable, and also including: a plurality of suction pipes respectively installed on the disc in a circular shape, each of the suction pipes is provided with an electric valve, and a filter is installed at the end of each suction pipe; a cannula installed on the turntable for lifting and lowering, one end of the cannula is vertically facing the disc; a pump body connected to the cannula, a solenoid valve is provided on the water outlet end of the pump body, and an empty drain pipe is provided on the solenoid valve of one passage; a detector, the other passage of the solenoid valve leads to the detector; a discharge pipe, used to discharge the water sample detected by the detector; an air pipe and a water pipe, both connected to the cannula, used to clean the suction pipe and the cannula before and after sampling in the suction pipe.

[0005] Preferably, an electric push rod is installed on the turntable, and the execution end of the electric push rod is connected to the cannula; a sensor 1 is installed on each suction tube on the disc, and a sensor 2 is installed on the turntable.

[0006] Furthermore, a cleaning wire is arranged in the suction pipe, which is used to cause disturbance in the suction pipe through gas or liquid or gas-liquid driving.

[0007] Preferably, the cleaning wire comprises a wire and a folded line portion arranged in the middle of the wire.

[0008] Preferably, the cleaning wire comprises a wire and double-sided arc portions arranged in the middle of the wire.

[0009] Preferably, the cleaning wire comprises a wire and a single-sided arc portion arranged in the middle of the wire.

[0010] Preferably, the cleaning wire comprises a wire and a spiral portion arranged in the middle of the wire.

[0011] A sewage treatment system, using the multi-point monitoring device for sewage treatment process, comprises: Acquisition module: obtains water quality test data from each pool to form a time series data set; Error verification module: Generate pollutant concentration threshold intervals for each sewage pool based on historical data ; Cleaning Strategy Generator: Executes the following control logic: (1) When When the air pipe cleaning mode is triggered, the cleaning time is seconds, of which is the current detection value, is the value of the previous period; (2) When When the air-water mixed cleaning mode is triggered, the cleaning time is Second, =1.5 ; (3) When , activate the fault diagnosis protocol and extend the cleaning time to , For cleaning time; Processing control module: converts cleaning instructions into control signals for air pipes, water pipes, solenoid valves and electric valves.

[0012] Preferably, the error checking module comprises: Encapsulate N consecutive detection data into Y1 data packets. ; Calculate the standard deviation of the Y1 packet ,when Generate equipment failure warning when Dynamically adjust the threshold interval of subsequent cycles according to the σ value: , ,in is the mean value of Y1 data packet.

[0013] Preferably, the fault diagnosis protocol includes: When the Y1 packet is repeated three times in a row When the cleaning wire in the target suction pipe is located, it is faulty; The degree of air pump efficiency attenuation is determined based on the ratio Pt / T of the air pipe pressure sensor data Pt and the actual cleaning time T. A maintenance instruction is triggered when the Pt / T ratio is less than 80% of the rated efficiency value of the air pump under standard working conditions.

[0014] Preferably, the air-water mixed cleaning mode performs the following steps: Stage 1: 0-0.3 During the period, the air pressure is 0.5 MPa in pulse mode; Phase 2: 0.3 ~0.7 During the period, switch to air-water alternating pulse; Phase 3: 0.7 ~ During this period, rinse with pure water.

[0015] Furthermore, it also includes: storing the standard spectrum curve of each pool in the detector, and detecting the correlation coefficient between the spectrum and the standard curve in real time When the calibration fails for three consecutive times, the current suction pipe is locked and switched to the backup pipe.

[0016] After adopting the above technical scheme, the present invention has the following beneficial effects compared with the prior art: the present device and system can further reduce the residual amount in the suction tube and the cannula through the dual-mode cleaning of gas recoil tube + water flushing, effectively avoiding cross contamination, and further reduce the cross-mixing of residual liquid by setting multiple suction tubes separately and connecting them to the cannula individually, thereby improving the accuracy of water samples during water sample collection; and can automatically match the appropriate cleaning method according to the water sample detection data each time, thereby reducing costs while improving detection efficiency, and using physical cleaning methods instead of chemical cleaning to reduce the use of chemical reagents, while also being able to determine whether the cleaning wire is broken based on data comparison. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In the attached picture: Figure 1This is a schematic diagram of the structure of a multi-point monitoring device for a sewage treatment process proposed by the present invention; Figure 2 This is a schematic structural diagram of a broken line portion, a double-sided circular arc portion, a single-sided circular arc portion, and a spiral portion of a multi-point monitoring device for a sewage treatment process proposed by the present invention; Figure 3 A block diagram of a sewage treatment system proposed by the present invention; Figure 4 It is a schematic diagram of the prior art.

[0018] In the figure: 1. disc; 11. motor; 12. suction pipe; 13. filter; 14. electric valve; 15. sensor 1; 2. turntable; 20. sensor 2; 21. electric push rod; 22. cannula; 23. air pipe; 24. water pipe; 25. pump body; 26. solenoid valve; 261. empty exhaust pipe; 27. detector; 271. discharge pipe; 4. cleaning wire; 40. silk thread; 41. fold line part; 42. double-sided arc part; 43. single-sided arc part; 44. spiral part; 45. connecting block. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0020] Example 1: Reference Figure 1 A multi-point monitoring device for a sewage treatment process comprises a disc 1 rotatably connected to a turntable 2, and further comprises: a plurality of suction pipes 12 circumferentially mounted on the disc 1, each suction pipe 12 being provided with an electric valve 14, and a filter 13 being installed at the end of each suction pipe 12; a cannula 22 which is lifted and lowered on the turntable 2, one end of the cannula 22 being vertically directed toward the disc 1; a pump body 25 connected to the cannula 22, wherein the pump body 25 can adopt a peristaltic pump. According to the working principle of the peristaltic pump, the water sample can be extracted more accurately, and the cannula 22 can be cleaned conveniently. It should be understood that the connecting section between the cannula 22 and the electric push rod 21 is made of hard material, and the other parts are made of soft material, so that the peristaltic pump can normally squeeze the cannula 22 to realize the water pumping operation. A solenoid valve 26 is provided on the water outlet end of the pump body 25, and an empty drain pipe 261 is provided on the solenoid valve 26 of one passage; a detector 27, and another passage of the solenoid valve 26 leads to the detector 27; a discharge pipe 271 is used to discharge the water sample detected by the detector 27; the air pipe 23 and the water pipe 24 are both connected to the cannula 22, and are used to clean the suction tube 12 and the cannula 22 before and after sampling in the suction tube 12.

[0021] An electric push rod 21 is installed on the turntable 2, and the execution end of the electric push rod 21 is connected to the insertion tube 22; a sensor 1 15 is installed at each suction tube 12 on the disc 1, and a sensor 2 20 is installed on the turntable 2.

[0022] When the device is in use, multiple suction tubes 12 are placed in different pools. When a water sample needs to be tested in a certain pool, the motor 11 installed at the bottom of the disc 1 drives the turntable 2 to rotate, and the sensor 2 20 on the turntable 2 senses the suction tube 12 corresponding to the pool (multiple sensors 15 are numbered for easy identification), and then the electric push rod 21 pushes the cannula 22 downward to insert one end of the cannula 22 into the corresponding suction tube 12 (a sealing pad is provided on the periphery of the cannula 22 to ensure sealing), and then the electric valve 14 of the suction tube 12 is opened, and the air pipe 23 or the water pipe 24 or the air pipe 23 and the water pipe 24 are activated at the same time to clean the suction tube 12 and the cannula 22, and then the suction tube 12 and the cannula 22 are pre-cleaned before sampling to discharge the water remaining in the suction tube 12 and the cannula 22; It should be understood that when performing preliminary cleaning, the solenoid valve 26 connects the insert tube 22 with the drain pipe 261 , and the water remaining in the insert tube 22 is discharged through the drain pipe 261 .

[0023] After the preliminary cleaning is completed, the pump body 25 is started to suck the water sample into the water sample storage box of the detector 27 for detection; The detector 27 adopts a spectrometer, and during detection, the electrodes in the spectrometer and the spectrum detection rod are placed in the water sample storage box for detection.

[0024] When the test is completed, the tested water sample is discharged through the discharge pipe 271 on the water sample storage box; In the early cleaning process, the gas or water or gas-liquid mixture introduced can not only clean the suction tube 12 and the cannula 22, but also backwash the filter 13. The main function of the filter 13 is to prevent foreign matter from entering the suction tube 12, so as to prevent the water sample from containing a large amount of solid foreign matter. At the same time, when the gas or water or gas-liquid mixture is backwashing the filter 13, it can also stir the liquid in the pool to avoid inaccurate water samples caused by sedimentation and standing of the liquid in the pool.

[0025] When the detection is completed, the air pipe 23 or the water pipe 24 or the air pipe 23 and the water pipe 24 are activated again, and gas or clean water or a gas-liquid mixture is discharged into the suction tube 12 and the cannula 22 again for post-cleaning. The purpose of post-cleaning is to empty the residual liquid in the cannula 22, reduce the residual liquid in the cannula 22, avoid the impurities in the liquid from being deposited or attached to the inner wall of the cannula 22, and at the same time, clean the suction tube 12 again to keep the inner wall of the suction tube 12 clean.

[0026] Furthermore, the electric valve 14 is installed at the lower end of the suction pipe 12. The electric valve 14 is capable of working underwater and has waterproof performance. Furthermore, in order to improve the safety and stability of the electric valve 14 working underwater, a sealing shell is installed on the outer periphery of the suction pipe 12. The sealing shell covers the electric valve 14 to isolate the electric valve 14 from contact with water. The electric valve 14 installed at this position can discharge the residual water in the suction pipe 12 into the pool when gas is filled into the suction pipe 12 during the later cleaning process, and then close the electric valve 14 to block the liquid in the pool from flowing into the suction pipe 12, thereby reducing the accuracy of the water sample affected by the residual water in the suction pipe 12 or the dirt attached to the inner wall.

[0027] Example 2: Reference Figure 1 , Figure 2 , a multi-point monitoring device for sewage treatment process, which is basically the same as embodiment 1, and further: a cleaning wire 4 is provided in the suction pipe 12, which is used to disturb in the suction pipe 12 by gas or liquid or gas-liquid drive; During the early cleaning, post-cleaning and sampling processes, gas, liquid, and gas-liquid mixture will come into contact with the cleaning wire 4, causing impact and disturbance to the cleaning wire 4. The cleaning wire 4 is installed in the suction tube 12 through the connecting blocks 45 set at both ends. The cleaning wire 4 can be made of stainless steel wire or nickel-titanium alloy wire, which has anti-corrosion effect and can be formed into a desired shape.

[0028] When the cleaning wire 4 is disturbed in the suction tube 12, a random path is generated to contact the inner wall of the suction tube 12, and dirt attached to the inner wall of the suction tube 12 is cleaned, thereby further improving the accuracy of water sampling and accurately analyzing the water sample data.

[0029] Preferably, the cleaning wire 4 includes a wire 40 and a fold line portion 41 arranged in the middle of the wire 40. The cleaning wire 4 is arranged by oblique pulling, and generates alternating Karman vortex streets under fluid impact, causing high-frequency micro-vibrations, forming local stress concentration at the folding point, generating point impact force, and thereby enhancing the cleaning of the inner wall of the suction tube 12.

[0030] Preferably, the cleaning wire 4 includes a wire 40 and a double-sided arc portion 42 arranged in the middle of the wire 40 . The double-sided arc portion 42 can swing when impacted, thereby enhancing the cleaning of the inner wall of the suction tube 12 .

[0031] Preferably, the cleaning wire 4 includes a wire 40 and a single-sided arc portion 43 arranged in the middle of the wire 40, which can be biased toward one side of the wire 40 through the force point, so that the turbulence generated by the swing is enhanced, thereby enhancing the cleaning of the inner wall of the suction tube 12 and reducing the interference of dirt on the accuracy of the water sample.

[0032] Preferably, the cleaning wire 4 includes a wire 40 and a spiral portion 44 arranged in the middle of the wire 40, inducing the fluid to produce an axial + tangential composite flow. The spiral portion 44 continuously scrapes the inner wall, thereby enhancing the cleaning of the inner wall of the suction tube 12 and reducing the interference of dirt on the accuracy of the water sample.

[0033] Therefore, the device further improves the accuracy of water samples during water sample collection by cooperating the cleaning wire 4 with gas or water or a mixture of gas and liquid, thereby ensuring the accuracy of water sample data.

[0034] Embodiment 3: A sewage treatment system, using the multi-point monitoring device for sewage treatment process, comprising: Acquisition module: obtains water quality test data from each pool to form a time series data set; Error verification module: Generate pollutant concentration threshold intervals for each sewage pool based on historical data , dynamic threshold calculation based on historical data can effectively eliminate environmental fluctuation interference, where It is set by those skilled in the art; During data collection, data set processing is also included. The specific steps are: S1. When N sets of data are collected continuously, the N sets of data should be smoothed and calibrated; S2. Perform error verification on the smoothed data, which is specifically as follows: define an error value , label N groups of data, X1, X2, X3...Xn; S3. Should meet Sequential reasoning, that is, the data meets the requirements; S4. Directly aspirate the water sample without cleaning.

[0035] Cleaning Strategy Generator: Executes the following control logic: (1) When When the air pipe cleaning mode is triggered, the cleaning time is seconds, of which is the current detection value, is the value of the previous cycle, and the current detection value and the value of the previous cycle are obtained by detecting water quality data through the detector 27; (2) When When the air-water mixed cleaning mode is triggered, the cleaning time is Second, =1.5 ; (3) When , activate the fault diagnosis protocol and extend the cleaning time to , For cleaning time; Processing control module: converts the cleaning instruction into control signals for the air pipe 23, the water pipe 24, the solenoid valve 26 and the electric valve 14; By comparing and analyzing the test data and selecting appropriate cleaning strategies, the efficiency of early cleaning and later cleaning can be effectively improved, the time spent on cleaning can be reduced, and cleaning costs can be saved.

[0036] The error verification module includes: Encapsulate N consecutive detection data into Y1 data packets. ; Calculate the standard deviation of the Y1 packet ,when Generate equipment failure warning when Dynamically adjust the threshold interval of subsequent cycles according to the σ value: , ,in is the mean value of Y1 data packet.

[0037] The troubleshooting protocol includes: When the Y1 packet is repeated three times in a row When the cleaning wire 4 in the target suction pipe 12 is located, it fails; According to the ratio Pt / T of the air pipe 23 pressure sensor data Pt and the actual cleaning time T, the degree of air pump efficiency attenuation is judged, and the maintenance instruction is triggered when the ratio Pt / T is less than 80% of the rated efficiency value of the air pump under standard working conditions; By comparing the data, it is possible to effectively determine whether the cleaning wire 4 is broken and whether the air pump is faulty, so that timely maintenance can be performed to avoid inaccuracy in the water sample due to residual mixing.

[0038] Furthermore, in order to more accurately determine whether the cleaning wire 4 is broken, a water quality detection sensor is installed near the filter 13 on the suction tube 12 to monitor the water quality data passing through the filter 13. When the measured water quality data is less than the historical data (a, b), it means that the water quality sensor is faulty. When the water quality data is within the interval of the historical data (a, b), it means that the filter 13 is normal. When the water quality data is greater than the historical data (a, b), it means that the filter 13 is faulty. Therefore, when the water quality data passing through the filter 13 is within the historical data (a, b), but the data measured by the detector 27 is greater than the pollutant concentration threshold interval , it means that the cleaning wire 4 is faulty.

[0039] The air-water cleaning mode performs the following steps: Stage 1: 0-0.3 During the period, the air pressure was 0.6MPa and the frequency was 2Hz. Phase 2: 0.3 ~0.7 During the period, switch to air-water alternating pulse, which can adopt the mode of air pressure 0.3MPa and water pressure 0.2MPa; Phase 3: 0.7 ~ During this period, pure water flushing, water pressure 0.4MPa; According to different needs, the inner diameters of the suction tube 12 and the cannula 22 may be changed, including but not limited to the specific selection of the above-mentioned air pressure and water pressure, which may be actually adjusted according to the inner diameters of the suction tube 12 and the cannula 22.

[0040] The invention also includes: storing the standard spectrum curve of each pool in the detector 27, and detecting the correlation coefficient between the spectrum and the standard curve in real time. When the calibration fails for three consecutive times, the current suction pipe 12 is locked and switched to the standby pipe. The correlation coefficient between the real-time detection spectrum and the standard spectrum is R²=0.89<0.95 threshold; Calibration steps: S1: Start enhanced cleaning (0.6MPa gas × 30 seconds + 0.4MPa clean water × 20 seconds); S2: resample and obtain new spectral data (R²new=0.97); S3: Update the standard spectrum library. If the calibration fails for three consecutive times, the current pipeline will be locked.

[0041] Therefore, the device and system can further reduce the residual amount in the suction tube 12 and the cannula 22 through the dual-mode cleaning of gas recoil tube + water flushing, effectively avoid cross contamination, and further reduce the cross mixing of residual liquid by setting multiple suction tubes 12 separately and connecting them to the cannula 22 individually, thereby improving the accuracy of water samples during water sample collection; and can automatically match the appropriate cleaning method according to the water sample detection data each time, thereby reducing costs while improving detection efficiency, and using physical cleaning methods instead of chemical cleaning to reduce the use of chemical reagents. At the same time, it can also determine whether the cleaning wire 4 is broken based on data comparison.

[0042] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with the present invention can make some changes or modify the technical contents suggested above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the solution of the present invention.

Claims

1. A multi-point monitoring device for a sewage treatment process, comprising a disc (1) rotatably connected to a turntable (2), characterized in that: Also includes: A plurality of suction pipes (12) are respectively installed on the disc (1) in a circular shape, each of the suction pipes (12) is provided with an electric valve (14), and a filter (13) is installed at the end of each of the suction pipes (12); A plug (22) is lifted and arranged on the rotating disk (2), one end of the plug (22) being vertically oriented toward the disk (1); A pump body (25) connected to the insert pipe (22), wherein a solenoid valve (26) is provided on the water outlet end of the pump body (25), wherein an empty drain pipe (261) is provided on the solenoid valve (26) of one passage; A detector (27), wherein another passage of the solenoid valve (26) leads to the detector (27); A discharge pipe (271) for discharging the water sample detected by the detector (27); The air pipe (23) and the water pipe (24) are both connected to the cannula (22) and are used to clean the inside of the suction tube (12) and the cannula (22) before and after sampling through the suction tube (12); A cleaning wire (4) is arranged in the suction pipe (12) for causing disturbance in the suction pipe (12) through gas or liquid or gas-liquid driving.

2. A multi-point monitoring device for sewage treatment process according to claim 1, characterized in that: An electric push rod (21) is mounted on the rotating disk (2), and an actuating end of the electric push rod (21) is connected to the insertion tube (22); a sensor 1 (15) is mounted on each suction tube (12) on the disk (1), and a sensor 2 (20) is mounted on the rotating disk (2).

3. A multi-point monitoring device for sewage treatment process according to claim 1, characterized in that: The cleaning wire (4) comprises a wire (40) and a folded line portion (41) arranged in the middle of the wire (40).

4. A multi-point monitoring device for sewage treatment process according to claim 1, characterized in that: The cleaning wire (4) comprises a wire (40) and double-sided arc portions (42) arranged in the middle of the wire (40).

5. A multi-point monitoring device for sewage treatment process according to claim 1, characterized in that: The cleaning wire (4) comprises a wire (40) and a single-sided arc portion (43) arranged in the middle of the wire (40).

6. A multi-point monitoring device for sewage treatment process according to claim 1, characterized in that: The cleaning wire (4) comprises a wire (40) and a spiral portion (44) arranged in the middle of the wire (40).

7. A sewage treatment system, using a multi-point monitoring device for sewage treatment process according to any one of claims 3 to 6, characterized in that: include: Acquisition module: obtains water quality test data from each pool to form a time series data set; Error verification module: Generate pollutant concentration threshold intervals for each sewage pool based on historical data ; Cleaning Strategy Generator: Executes the following control logic: (1) When When the air pipe cleaning mode is triggered, the cleaning time is seconds, of which is the current detection value, is the value of the previous period; (2) When When the air-water mixed cleaning mode is triggered, the cleaning time is Second, =1.5 ; (3) When , activate the fault diagnosis protocol and extend the cleaning time to , For cleaning time; Processing control module: converts the cleaning instruction into control signals for the air pipe (23), the water pipe (24), the solenoid valve (26) and the electric valve (14).

8. A sewage treatment system according to claim 7, characterized in that: The error checking module comprises: Encapsulate N consecutive detection data into Y1 data packets. ; Calculate the standard deviation of the Y1 packet ,when Generate equipment failure warning when according to The value dynamically adjusts the threshold interval of subsequent cycles: , ,in is the mean value of Y1 data packet.

9. A sewage treatment system according to claim 8, characterized in that: The fault diagnosis protocol includes: When the Y1 packet is repeated three times in a row When the cleaning wire (4) in the target suction pipe (12) is located, a fault occurs; The degree of air pump efficiency attenuation is determined based on the ratio Pt / T of the air pipe (23) pressure sensor data Pt to the actual cleaning time T. When the ratio Pt / T is less than 80% of the rated efficiency value of the air pump under standard working conditions, a maintenance instruction is triggered.

10. A sewage treatment system according to claim 9, characterized in that: The air-water mixed cleaning mode performs the following steps: Stage 1: 0-0.3 During the period, the air pressure is 0.5 MPa in pulse mode; Phase 2: 0.3 ~0.7 During the period, switch to air-water alternating pulse; Phase 3: 0.7 ~ During this period, rinse with pure water.

11. A sewage treatment system according to claim 9, characterized in that: Also includes: The standard spectrum curve of each pool is stored in the detector (27), and the correlation coefficient between the spectrum and the standard curve is detected in real time. When the calibration fails for three consecutive times, the current suction pipe (12) is locked and switched to the backup pipe.

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