Sewage plant inlet water quality monitoring and early warning automation device

Abstract

The present invention discloses an automatic device for monitoring and warning the influent water quality of a sewage treatment plant, and relates to the technical field of sewage treatment. The device is arranged at the upstream pipe network of the sewage treatment plant, and can automatically sample sewage from the pipe network at regular intervals, and monitor the water quality parameters of the influent pipe network. Through parameters such as the ammonia nitrogen removal rate before and after sludge nitrification aeration, the strength of biological toxic substances in the influent water quality is quantified, and the warning threshold is set. The warning data is transmitted in real time through the PLC control system and the wireless transmission system. After computer-side data diagnosis, the influent water quality of the sewage treatment plant can be monitored and warned throughout the day. This device can not only warn of high-concentration COD and ammonia nitrogen, but also warn of sewage with high biological toxicity. Compared with the sludge respiration rate method and the luminous bacteria method on the market, it has stronger applicability, intuitive effect, stable operation, quick and easy operation, and good repeatability and stability.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment devices, and in particular to an automated device for monitoring and warning the influent quality of a sewage treatment plant. Background Art

[0002] In recent years, with the continuous progress of society and the rapid development of the industrial economy, pollution accidents in chemical, smelting, papermaking and other enterprises have been increasing year by year. The incomplete treatment and accidental drainage produced by these industrial enterprises during the production process contain toxic substances that cannot be discharged into the natural environment, but choose to be discharged into the sewage pipe network, and finally converge to the downstream urban sewage treatment plant, causing abnormal fluctuations in the water quality of the sewage plant inlet, and frequent high COD and high ammonia nitrogen wastewater impacts. More importantly, various untreated heavy metals and organic poisons reach the downstream sewage treatment plant through industrial wastewater and other channels, which will impact the activated sludge system, affect the normal sewage treatment process, and even cause the biochemical treatment system to collapse, and then need to re-carry out time-consuming and labor-intensive bacterial cultivation work, which has a huge impact on the normal operation of the sewage treatment plant. In view of the above problems, considering the need to conduct toxicity early warning monitoring of sewage, so as to warn of toxic substances in the incoming water in advance and give operators sufficient emergency response time, this has important practical significance for the normal operation of the sewage treatment plant.

[0003] At present, there are few integrated early warning equipment for sewage treatment plant influent quality monitoring on the market, and they are usually based on the luminescent bacteria inhibition rate method and the sludge respiration rate method. The luminescent bacteria method has a high inhibition rate for high-concentration influent, and has certain limitations for influents with a high proportion of industrial wastewater, and there are certain biological differences between luminescent bacteria and nitrifying bacteria; the sludge respiration rate method has large fluctuations in oxygen consumption in a short period of time, poor stability, and insufficient direct effect, which has certain limitations. The traditional method of using activated sludge for biochemical toxicity detection and evaluation usually remains in the laboratory stage, and cannot quickly, effectively and comprehensively respond to various complex rapid detection wastewater pollution conditions, and cannot evaluate the comprehensive toxicity of biochemical toxicity and conduct biological early warning. How to establish a stable and efficient automated early warning device through the activated sludge method is a difficult problem in the early warning technology of sewage treatment plants today. Summary of the invention

[0004] The technical problem to be solved by the present invention is how to provide a sewage plant inlet water quality monitoring and early warning automation device with strong adaptability, high accuracy, simple operation and low cost.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: an automated device for monitoring and warning the water quality of sewage treatment plant inlet water, characterized in that: it includes a raw water sampling pump, the water inlet end of the raw water sampling pump is connected with a filtering device, the raw water sampling pump is used to collect sewage from the pipe network, the water outlet end of the raw water sampling pump is connected to the water inlet of the sampling mixing tank, the water outlet of the sampling mixing tank is connected to the water inlet end of the first lifting metering pump, the output end of the first lifting metering pump is divided into three paths, the first path is connected to the water inlet end of the COD monitor through a solenoid valve and a filtering device, the second path is connected to the water inlet end of the excessive sample retention instrument, and the third path is connected to the water inlet end of a reactor through a solenoid valve, and the sampling end of the reactor is connected to the liquid inlet end of the ammonia nitrogen monitor through the filtering device. The mud outlet end of the sludge temporary storage tank is connected to the mud inlet end of the second lifting and metering pump, the mud outlet end of the second lifting and metering pump is connected to the mud inlet end of the reactor through a solenoid valve, the liquid outlet end of the reactor is connected to the liquid inlet end of the third lifting and metering pump through a solenoid valve, the liquid outlet end of the third lifting and metering pump is connected to the ammonium chloride standard liquid container, the air outlet end of the fan is connected to the aeration device in the sampling mixing tank, the aeration device in the reactor and the air inlet end of the aeration device in the sludge temporary storage tank through pipelines, the lifting pump and the solenoid valve are controlled by the PLC control cabinet, the data collected by the COD monitor, the ammonia nitrogen monitor, the excessive sample retention instrument and the sludge concentration meter are transmitted to the PLC control cabinet for data processing, and the device is controlled according to the processed data.

[0006] A further technical solution is that: a water inlet distributor is provided on the wall of the sampling mixing tank; the bottom of the sampling mixing tank is square or circular, a stirring device is provided on the bottom of the tank, the stirring device is a blade-type stirrer for mechanical stirring or aeration stirring through a fan aeration device; a drain valve is provided at the bottom of the sampling mixing tank, and a filtering device or a primary sedimentation tank is added at the front end.

[0007] A further technical solution is that the data port of the COD online monitor is connected to a PLC control cabinet for data recording and processing, and the concentration detected each time is the A value.

[0008] A further technical solution is that: a sample retaining device for exceeding the standard is arranged at the front end of the reactor, and a solenoid valve is arranged at the water inlet end of the sample retaining device for exceeding the standard; after the sample retaining device determines the threshold value of COD and ammonia nitrogen value according to the PLC control cabinet, it retains samples of the wastewater exceeding the standard, and the wastewater that does not exceed the standard is automatically discharged.

[0009] A further technical solution is to set a filtering device at the front end of the ammonia nitrogen monitor, and measure the ammonia nitrogen value twice before and after the reactor reaction each time, and transmit the data to the PLC control cabinet for data recording and processing.

[0010] A further technical solution is that the ammonium chloride concentration in the ammonium chloride standard solution container is 20 mg / L, a stirrer is arranged at the bottom of the container, a lifting metering pump is arranged at the bottom of the container, and the pump is connected to the reactor through a pipeline.

[0011] A further technical solution is that the sampling and mixing tank collects and mixes the sewage from the pipe network every i minutes through a raw water sampling pump, where i≥5.

[0012] A further technical solution is that: the number of the reactors can be N≥1, the inner wall of the reactor needs to be treated for corrosion resistance, and the outside of the reactor needs to be insulated; when each reactor has an early warning reaction, the ratio of sludge and sewage pumped in by the lifting metering pump is 3:7; when each reactor has an ammonium chloride standard reaction, the ratio of ammonium chloride and sludge pumped in by the lifting metering pump is 3:7.

[0013] A further technical solution is that the ammonia nitrogen online monitor detects twice each time, the first time is after the sewage and sludge are mixed for the first time, the detection concentration is B value, the second time is after the sewage and sludge are mixed and aerated, the detection concentration is C value, and the concentration difference D value = B value-C value; when the ammonium chloride standard solution is detected, the first time is after the ammonium chloride solution and sludge are mixed for the first time, the detection concentration is E value, and the second time is after the ammonium chloride solution and sludge are mixed and aerated, the detection concentration is F value, and the concentration difference G value = E value-F value.

[0014] A further technical solution is: when the detected concentration A value is ≥150mg / L or the detected concentration B value is ≥30mg / L, it is judged as a high-concentration sewage warning; when the D value is greater than 1.5mg / L and less than 2mg / L, the biological toxicity hazard level is judged to be Level I; when the D value is greater than 1mg / L and less than 1.5mg / L, the biological toxicity hazard level is judged to be Level II; when the D value is greater than 0.5mg / L and less than 1mg / L, the biological toxicity hazard level is judged to be Level III; when the D value is greater than 0mg / L and less than 0.5mg / L, the biological toxicity hazard level is judged to be Level IV; when the D value is 0mg / L, the biological toxicity hazard level is judged to be Level V; if the measured G value is less than or equal to the set value or the sludge storage time is greater than 7 days, the sludge needs to be replaced; finally, a corresponding influent water quality warning is issued according to the high-concentration impact type or the biological toxicity hazard level.

[0015] The beneficial effect of adopting the above technical scheme is that the nitrifying bacteria sludge of the sewage plant itself selected by the device has strong adaptability and high discrimination accuracy. The sludge activity in the sludge tank is effectively guaranteed by the sludge self-circulation system and the micro-aeration system. The sludge activity is quantified by the difference between the ammonium chloride standard solution and the ammonia nitrogen before and after the nitrification aeration of the sludge, laying the foundation for the operation stability and accuracy of the device. The parameters of the pipe network sewage are monitored regularly and quantitatively throughout the whole time period, and the difference before and after is compared with the warning threshold by the online ammonia nitrogen monitoring instrument. High-frequency warning of the influent water quality is achieved. The structure is simple and reliable, the method is direct, the accuracy is high, and the certainty is strong. In addition, the device requires a short time, and generally the warning evaluation results of the high-concentration water quality parameters of the pipe network influent or the comprehensive toxicity effect of biochemical toxicity can be obtained in 1 hour. It is easy to operate, low cost, simple instruments and equipment are required, and the environmental risk is small. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0017] Figure 1 It is a principle block diagram of the device described in the embodiment of the present invention. DETAILED DESCRIPTION

[0018] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0020] Overall, such as Figure 1As shown, an embodiment of the present invention discloses an automated device for monitoring and warning the influent water quality of a sewage treatment plant, comprising a raw water sampling pump, wherein the water inlet end of the raw water sampling pump is connected to a filtering device, the raw water sampling pump is used to collect sewage from a pipe network, the water outlet end of the raw water sampling pump is connected to the water inlet of a sampling mixing tank, the water outlet of the sampling mixing tank is connected to the water inlet end of a first lifting and metering pump, the output end of the first lifting and metering pump is divided into three paths, the first path is connected to the water inlet end of a COD monitor via an electromagnetic valve and a filtering device, the second path is connected to the water inlet end of an over-standard sample retention instrument, the third path is connected to the water inlet end of a reactor via a electromagnetic valve, the sampling end of the reactor is connected to the liquid inlet end of an ammonia nitrogen monitor via a filtering device, and the sludge outlet end of a sludge temporary storage tank is connected to the sludge outlet end of a sludge temporary storage tank. It is connected to the mud inlet end of the second lifting and metering pump, and the mud outlet end of the second lifting and metering pump is connected to the mud inlet end of the reactor through a solenoid valve. The liquid outlet end of the reactor is connected to the liquid inlet end of the third lifting and metering pump through a solenoid valve. The liquid outlet end of the third lifting and metering pump is connected to the ammonium chloride standard liquid container. The air outlet end of the fan is connected to the aeration device in the sampling mixing tank, the aeration device in the reactor and the air inlet end of the aeration device in the sludge temporary storage tank through pipelines. The lifting pump and the solenoid valve are controlled by the PLC control cabinet, and the data collected by the COD monitor, the ammonia nitrogen monitor, the excessive sample retention instrument and the sludge concentration meter are transmitted to the PLC control cabinet for data processing, and the device is controlled according to the processed data.

[0021] In addition, if Figure 1 As shown, the bottom of the sampling mixing tank, the bottom of the reactor and the bottom of the sludge temporary storage tank in the device are connected to the sewage pipe network through solenoid valves and pipelines respectively.

[0022] In the device described in the present application, a filter device is provided at the front end of the raw water sampling pump, and a valve should be provided at the rear end. A water inlet distributor is arranged on the wall of the sampling mixing tank; the bottom of the sampling mixing tank can be square or circular, and a stirring device is provided at the bottom of the tank, and the stirring device can be a mechanical stirring of a blade-type stirrer, or aeration stirring through a fan aeration device; a vent valve is provided at the bottom of the sampling mixing tank, and a filter device or a primary sedimentation tank needs to be added at the front end. The data port of the COD online monitor is connected to the PLC control cabinet for data recording and processing, and the concentration detected each time is the A value. The sample retention instrument for exceeding the standard should be set at the front end of the reactor, and a valve should be provided at the water inlet end of the sample retention instrument for exceeding the standard; the sample retention instrument for exceeding the standard retains samples of the sewage exceeding the standard after the computer determines the threshold value of the COD and ammonia nitrogen values, and the sewage that does not exceed the standard is automatically emptied.

[0023] The reactor is a reaction device for sludge and sewage. A ring-shaped water distributor should be set at the water inlet end of the reactor to flush the reactor pool wall. An aeration device is set at the bottom of the reactor. The aeration device can be an aeration pipe, an aeration plate or other forms. A filter device is set at the front end of the ammonia nitrogen monitor. The ammonia nitrogen value needs to be measured twice before and after the reactor reaction each time. The data is transmitted to the PLC control cabinet for data recording and processing. The ammonium chloride standard liquid container carries an ammonium chloride concentration of 20 mg / L. An agitator is set at the bottom of the container. A lifting metering pump is set at the bottom of the container and connected to the reactor through a pipeline. A micro-aeration device is required to store sludge in the sludge storage tank. A sludge concentration meter is set on the wall of the sludge storage tank. The tank wall and the tank bottom are connected to the lifting metering pump. The sludge can be pumped into the reactor through the lifting pump, and the sludge can also be self-circulated through the lifting pump. The sampling mixing tank collects and mixes the pipe network sewage every i minutes through the raw water sampling pump, i≥5, preferably 15.

[0024] The number of reactors can be N≥1, the inner wall of the reactor needs to be treated for corrosion resistance, and the outside of the reactor needs to be insulated. When each reactor is in early warning reaction, the ratio of sludge and sewage pumped in by the lifting metering pump is 3:7; when each reactor is in ammonium chloride standard reaction, the ratio of ammonium chloride and sludge pumped in by the lifting metering pump is 3:7.

[0025] Each test of the ammonia nitrogen monitor is divided into two times. The first time is after the sewage and sludge are mixed for the first time, and the detection concentration is B value. The second time is after the sewage and sludge are mixed and aerated, and the detection concentration is C value. The concentration difference D value = B value-C value. When testing with ammonium chloride standard solution, the first time is after the ammonium chloride solution and sludge are mixed for the first time, and the detection concentration is E value. The second time is after the ammonium chloride solution and sludge are mixed and aerated, and the detection concentration is F value. The concentration difference G value = E value-F value.

[0026] When the detection concentration A value is ≥150mg / L or the detection concentration B value is ≥30mg / L, it is judged as a high-concentration sewage warning; when the D value is greater than 1.5mg / L and less than 2mg / L, the biological toxicity hazard level is judged to be level I; when the D value is greater than 1mg / L and less than 1.5mg / L, the biological toxicity hazard level is judged to be level II; when the D value is greater than 0.5mg / L and less than 1mg / L, the biological toxicity hazard level is judged to be level III; when the D value is greater than 0mg / L and less than 0.5mg / L, the biological toxicity hazard level is judged to be level IV; when the D value is 0mg / L, the biological toxicity hazard level is judged to be level V. If the measured G value is less than or equal to the set value or the sludge storage time is greater than 7 days, the sludge needs to be replaced. Finally, the corresponding influent water quality warning is carried out according to the high-concentration impact type or biological toxicity hazard level.

[0027] In the present application, the sludge in the sludge temporary storage tank is the activated sludge in the biochemical pool of the sewage treatment plant; 20 mg / L ammonium chloride solution is prepared by diluting 1000 mg / L ammonium chloride with pure water.

[0028] Working principle: Figure 1 As shown, the sewage from the pipe network is lifted to the sampling mixing pool through the filter device and the raw water sampling pump, and the pool wall is first flushed and emptied. Sampling is carried out once every 15 minutes, four times an hour. After the four water inflows are mixed, the aerator at the bottom of the sampling mixing pool is turned on, and the aeration is stirred for one minute. The lifting metering pump sends the mixed and stirred sewage to the COD online monitor and the excessive sample retention instrument for monitoring and retention. Then the solenoid valve of the reactor is opened, and the sewage enters the water distributor inside the reactor to rinse the reactor briefly. After the flushing is completed, the sewage enters the reactor, the solenoid valve of the sludge storage tank is opened, and the sludge enters the reactor at the same time through the lifting metering pump, and the amount ratio of sewage to sludge entering the reactor is 7 to 3. Subsequently, the sampling mixing pool is completely emptied, and the sewage collection work for the second hour is started. After the sewage and sludge in the reactor are mixed, the aerator at the bottom of the reactor is started and stirred for one minute, and the ammonia nitrogen detector determines the ammonia nitrogen value of the supernatant after the reactor is filtered, and the aerator is turned on at the same time. After the aerator is aerated for 1 hour, the ammonia nitrogen detector performs a second determination on the supernatant in the reactor. Then the drain valve at the lower end of the reactor is opened, the mud-water mixture in the reactor is drained, and then the reactor enters the next cycle of work, and the cycle repeats. When multiple reactors are set, the reactors work in rotation to achieve multiple-frequency early warning measurements in a period of time. The computer side uses the values ​​of the COD online monitor and the ammonia nitrogen online monitor to make early warning judgments, and displays them at the sewage plant side through wireless transmission. The over-standard sample retention instrument works according to the set early warning threshold. When the early warning threshold is exceeded, the sewage sample is retained, and when it is not exceeded, the sample is emptied. The sewage plant can judge the type and degree of water quality impact at the water inlet end according to the actual data at the pipe network end and the water flow rate, and take targeted emergency management measures. The automation system can start the mixed aeration of ammonium chloride solution and sludge in the reactor every few hours. The ammonia nitrogen online detector measures once every one minute and one hour of aeration. The first measured ammonia nitrogen value is subtracted from the second measured ammonia nitrogen value. If the difference is greater than the set value, the sludge activity is good, otherwise the sludge is replaced.

[0029] Embodiment 1

[0030] At a certain moment, the sewage from the pipe network is lifted to the sampling mixing pool through the filtering device and the raw water sampling pump. 10L of sewage is sampled every 15 minutes, four times an hour. After the four water inflows are mixed, the aerator at the bottom of the sampling mixing pool is turned on and aerated and stirred for one minute. The lifting metering pump sends the mixed and stirred sewage to the COD online monitor and the excessive sample retention instrument for monitoring and retention. Then the solenoid valve of the reactor is opened, and the sewage enters the water distributor inside the reactor to flush the reactor for 1 minute. After the flushing is completed, the sewage enters the reactor, the solenoid valve of the sludge storage tank is opened, and the sludge enters the reactor at the same time through the lifting metering pump. The amount of sewage and sludge entering the reactor is 3.5L and 0.5L. After the sewage and sludge in the reactor are mixed, the aerator at the bottom of the reactor is started and stirred for one minute. The ammonia nitrogen detector determines the ammonia nitrogen value of the supernatant after the reactor is filtered, and the aerator is turned on at the same time. After the aerator is aerated for 1 hour, the ammonia nitrogen detector performs a second determination on the supernatant in the reactor. After measurement, the COD value was 100mg / L, and the ammonia nitrogen values ​​were 25mg / L and 20mg / L twice; the measurement results showed that the incoming water was normal, the wastewater retained by the sample retention instrument that exceeded the standard was discharged for treatment, and the early warning display result was normal.

[0031] Example 2

[0032] At a certain moment, the sewage from the pipe network is lifted to the sampling mixing pool through the filtering device and the raw water sampling pump. 10L of sewage is sampled every 15 minutes, four times an hour. After the four water inflows are mixed, the aerator at the bottom of the sampling mixing pool is turned on and aerated and stirred for one minute. The lifting metering pump sends the mixed and stirred sewage to the COD online monitor and the excessive sample retention instrument for monitoring and retention. Then the solenoid valve of the reactor is opened, and the sewage enters the water distributor inside the reactor to flush the reactor for 1 minute. After the flushing is completed, the sewage enters the reactor, the solenoid valve of the sludge storage tank is opened, and the sludge enters the reactor at the same time through the lifting metering pump. The amount of sewage and sludge entering the reactor is 3.5L and 0.5L. After the sewage and sludge in the reactor are mixed, the aerator at the bottom of the reactor is started and stirred for one minute. The ammonia nitrogen detector determines the ammonia nitrogen value of the supernatant after the reactor is filtered, and the aerator is turned on at the same time. After the aerator is aerated for 1 hour, the ammonia nitrogen detector performs a second determination on the supernatant in the reactor. After measurement, the COD value was 100mg / L, and the ammonia nitrogen values ​​were 35mg / L and 30mg / L respectively; the measurement results showed high-concentration impact sewage, and the excessive sample retention instrument was used for sample treatment. The early warning showed that the ammonia nitrogen concentration was abnormally high.

[0033] Example 3

[0034] At a certain moment, the sewage from the pipe network is lifted to the sampling mixing pool through the filtering device and the raw water sampling pump. 10L of sewage is sampled every 15 minutes, four times an hour. After the four water inflows are mixed, the aerator at the bottom of the sampling mixing pool is turned on and aerated and stirred for one minute. The lifting metering pump sends the mixed and stirred sewage to the COD online monitor and the excessive sample retention instrument for monitoring and retention. Then the solenoid valve of the reactor is opened, and the sewage enters the water distributor inside the reactor to flush the reactor for 1 minute. After the flushing is completed, the sewage enters the reactor, the solenoid valve of the sludge storage tank is opened, and the sludge enters the reactor at the same time through the lifting metering pump. The amount of sewage and sludge entering the reactor is 3.5L and 0.5L. After the sewage and sludge in the reactor are mixed, the aerator at the bottom of the reactor is started and stirred for one minute. The ammonia nitrogen detector determines the ammonia nitrogen value of the supernatant after the reactor is filtered, and the aerator is turned on at the same time. After the aerator is aerated for 1 hour, the ammonia nitrogen detector performs a second determination on the supernatant in the reactor. After measurement, the COD value was 100mg / L, and the ammonia nitrogen values ​​were 15mg / L and 14.5mg / L twice; the measurement result was biological toxicity impact sewage, and the excessive sample retention instrument was used for sample treatment. At this time, the biological toxicity hazard level was Level III, and a biological toxicity Level III warning could be issued.

[0035] Example 4

[0036] At a certain moment, the sewage from the pipe network is lifted to the sampling mixing pool through the filtering device and the raw water sampling pump. 10L of sewage is sampled every 15 minutes, four times an hour. After the four water inflows are mixed, the aerator at the bottom of the sampling mixing pool is turned on and aerated and stirred for one minute. The lifting metering pump sends the mixed and stirred sewage to the COD online monitor and the excessive sample retention instrument for monitoring and retention. Then the solenoid valve of the reactor is opened, and the sewage enters the water distributor inside the reactor to flush the reactor for 1 minute. After the flushing is completed, the sewage enters the reactor, the solenoid valve of the sludge storage tank is opened, and the sludge enters the reactor at the same time through the lifting metering pump. The amount of sewage and sludge entering the reactor is 3.5L and 0.5L. After the sewage and sludge in the reactor are mixed, the aerator at the bottom of the reactor is started and stirred for one minute. The ammonia nitrogen detector determines the ammonia nitrogen value of the supernatant after the reactor is filtered, and the aerator is turned on at the same time. After the aerator is aerated for 1 hour, the ammonia nitrogen detector performs a second determination on the supernatant in the reactor. After measurement, the COD value was 100mg / L, and the ammonia nitrogen values ​​were 15mg / L and 17mg / L twice; the measurement result was biological toxicity impact sewage, and the excessive sample retention instrument was used for sample retention treatment. At this time, the biological toxicity hazard level was Level V, and a biological toxicity Level V warning could be issued.

Claims

1. A sewage treatment plant inlet water quality monitoring and early warning automation device, characterized by: The invention comprises a raw water sampling pump, the water inlet end of the raw water sampling pump is connected with a filtering device, the raw water sampling pump is used to collect sewage from the pipe network, the water outlet end of the raw water sampling pump is connected with the water inlet of the sampling mixing tank, the water outlet of the sampling mixing tank is connected with the water inlet end of the first lifting metering pump, the output end of the first lifting metering pump is divided into three paths, the first path is connected with the water inlet end of the COD monitor through an electromagnetic valve and a filtering device, the second path is connected with the water inlet end of the excessive sample retention instrument, the third path is connected with the water inlet end of a reactor through an electromagnetic valve, the sampling end of the reactor is connected with the liquid inlet end of the ammonia nitrogen monitor through the filtering device, a sludge concentration meter is arranged on the wall of the sludge temporary storage tank, and the mud outlet end of the sludge temporary storage tank is connected with the second lifting metering pump. The mud inlet end of the metering pump is connected, the mud outlet end of the second lifting metering pump is connected to the mud inlet end of the reactor through an electromagnetic valve, the liquid inlet end of the reactor is connected to the liquid outlet end of the third lifting metering pump through an electromagnetic valve, the liquid inlet end of the third lifting metering pump is connected to the ammonium chloride standard liquid container, the air outlet end of the fan is respectively connected to the aeration device in the sampling mixing tank, the aeration device in the reactor and the air inlet end of the aeration device in the sludge temporary storage tank through pipelines, the lifting metering pump and the electromagnetic valve are controlled by a PLC control cabinet, and the data collected by the COD monitor, ammonia nitrogen monitor, excessive sample retention instrument and sludge concentration meter are transmitted to the PLC control cabinet for data processing, and control is performed according to the processed data; The bottom of the sampling mixing pool, the bottom of the reactor and the bottom of the sludge storage tank are connected to the sewage network through solenoid valves and pipelines respectively; the ammonia nitrogen monitor needs to measure the ammonia nitrogen value twice before and after the reactor reaction each time, and compare the difference between the two ammonia nitrogen values ​​and the COD monitor value with the warning threshold, make a warning judgment and display it at the sewage treatment plant end through wireless transmission.

2. The sewage treatment plant inlet water quality monitoring and early warning automation device as claimed in claim 1, characterized in that: The pool wall of the sampling mixing pool is provided with a water inlet distributor; the pool bottom of the sampling mixing pool is square or circular, and a stirring device is provided at the pool bottom, and the stirring device is a blade-type stirrer for mechanical stirring or aeration stirring through a fan aeration device; a vent valve is provided at the bottom of the sampling mixing pool, and a filtering device or a primary sedimentation tank is added at the front end.

3. The sewage treatment plant inlet water quality monitoring and early warning automation device as claimed in claim 1, characterized in that: The data port of the COD monitor is connected to the PLC control cabinet for data recording and processing, and the concentration detected each time is the A value.

4. The sewage treatment plant inlet water quality monitoring and early warning automation device as claimed in claim 1, characterized in that: The sample retaining device for exceeding the standard is arranged at the front end of the reactor, and a solenoid valve is arranged at the water inlet end of the sample retaining device for exceeding the standard. After the sample retaining device determines the COD and ammonia nitrogen difference threshold value according to the PLC control cabinet, it retains samples of the wastewater exceeding the standard and automatically discharges the wastewater that does not exceed the standard.

5. The sewage treatment plant inlet water quality monitoring and early warning automation device as claimed in claim 1, characterized in that: The ammonium chloride concentration of the ammonium chloride standard solution container is 20 mg / L. A stirrer is arranged at the bottom of the container, and a lifting metering pump is arranged at the bottom of the container, which is connected to the reactor through a pipeline.

6. The sewage treatment plant inlet water quality monitoring and early warning automation device as claimed in claim 1, characterized in that: The sampling and mixing tank collects and mixes the sewage from the pipe network every i minutes through the raw water sampling pump, i≥5.

7. The sewage treatment plant inlet water quality monitoring and early warning automation device as claimed in claim 1, characterized in that: The number of the reactors can be N≥1, the inner wall of the reactor needs to be treated for corrosion resistance, and the outside of the reactor needs to be insulated; when each reactor has an early warning reaction, the ratio of sludge and sewage pumped in by the lifting metering pump is 3:7; when each reactor has an ammonium chloride standard reaction, the ratio of ammonium chloride and sludge pumped in by the lifting metering pump is 3:

7.

8. The sewage treatment plant inlet water quality monitoring and early warning automation device as claimed in claim 3, characterized in that: The ammonia nitrogen online monitor is divided into two detections each time. The first detection is after the sewage and sludge are mixed for the first time, and the detection concentration is B value. The second detection is after the sewage and sludge are mixed and aerated, and the detection concentration is C value. The concentration difference D value = B value-C value. When detecting the ammonium chloride standard solution, the first detection is after the ammonium chloride solution and sludge are mixed for the first time, and the detection concentration is E value. The second detection is after the ammonium chloride solution and sludge are mixed and aerated, and the concentration difference G value = E value-F value.

9. The sewage treatment plant inlet water quality monitoring and early warning automatic device as claimed in claim 8, characterized in that: When the detection concentration A value is ≥150mg / L or the detection concentration B value is ≥30mg / L, it is judged as a high-concentration sewage warning; When the D value is greater than 1.5mg / L and less than 2mg / L, the biological toxicity hazard level is judged to be Level I; when the D value is greater than 1mg / L and less than 1.5mg / L, the biological toxicity hazard level is judged to be Level II; when the D value is greater than 0.5mg / L and less than 1mg / L, the biological toxicity hazard level is judged to be Level III; when the D value is greater than 0mg / L and less than 0.5mg / L, the biological toxicity hazard level is judged to be Level IV; when the D value is 0mg / L, the biological toxicity hazard level is judged to be Level V; if the measured G value is less than or equal to the set value or the sludge storage time is greater than 7 days, the sludge needs to be replaced; finally, the corresponding influent water quality warning is issued according to the high concentration shock type or the biological toxicity hazard level.

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