Agricultural non-point source sewage quality improving system

Abstract

The utility model discloses a water quality improving system for agricultural non-point source sewage. The water quality improving system comprises a water inlet lifting pump, an ammonia nitrogen removal tank, a magnetic coagulation reaction tank, an inclined plate sedimentation tank, a magnetic separation system, a dosing system, a sludge dewatering system and a PLC (Programmable Logic Controller) control system, in the dry season, the water inlet lifting pump lifts sewage collected in the ecological paddy field to the water conservancy irrigation system for farmland irrigation. According to the utility model, a physicochemical water treatment process is adopted, the whole set of equipment is small in occupied area and high in treatment capacity, does not need microbial acclimation, can be quickly started and stopped, and combines the functions of farmland tail water treatment and sewage recycling; the method is suitable for agricultural non-point source pollution treatment in areas with shortage of land resources, serious agricultural non-point source pollution and shortage of irrigation water resources, and can be used for treating inferior five-class water to reach the surface water standard IV.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a system for improving the water quality of agricultural non-point source sewage. Background Art

[0002] Existing water treatment processes mostly use microbial processes or biochemical treatment technologies of artificial wetlands. Biochemical processes have the advantages of high treatment efficiency and low operating costs. They are widely used as mainstream processes in municipal sewage treatment, sewage plant upgrading and watershed ecological restoration. However, agricultural non-point source pollution has obvious volatility and randomness in time and space. At the same time, the amount of sewage is large, the concentration of pollutants is low, the traditional process has high treatment costs, large land area, and high operation and maintenance difficulties. Point source pollution control methods are not suitable for agricultural non-point source pollution control.

[0003] Agriculture around cities in southern my country is mainly vegetable planting, and the local area is equipped with a relatively complete irrigation water supply network and irrigation tailwater discharge ditches. The irrigation method of vegetable farmland is different from that of traditional grain crops, and it is necessary to "soak the fields" from time to time. The special farming method leads to higher water consumption and drainage of farmland than traditional agriculture. As a result, local agricultural non-point source pollution shows seasonal characteristics of lack of irrigation water resources in the dry season and large tailwater discharge in the rainy season. It is difficult to control non-point source pollution, and there is currently a lack of effective water pollution control and water resource reuse measures.

[0004] To this end, it is necessary to develop a process equipment that targets the characteristics of agricultural non-point source pollution and the current shortcomings in its management, while taking into account the recycling of water resources, so as to achieve effective terminal treatment of agricultural non-point source wastewater and reduce the discharge of pollutants into natural water bodies. Utility Model Content

[0005] In view of the shortcomings of existing agricultural non-point source pollution control technologies, the utility model provides a water quality improvement system for agricultural non-point source sewage, which adopts a physicochemical treatment process and can achieve rapid start-up and operation of the system. By optimizing the process parameters of each reaction section, it ensures that the effluent meets the surface water quality standard IV (river channel) and can also achieve functional switching between rainy season and dry season.

[0006] To this end, the utility model adopts the following technical solutions:

[0007] A water quality improvement system for agricultural non-point source sewage, comprising a water inlet lift pump, an ammonia nitrogen removal tank, a magnetic coagulation reaction tank, an inclined plate sedimentation tank, a magnetic separation system and a sludge dewatering system; wherein:

[0008] The water inlet lift pump is used to transport agricultural non-point source sewage to the ammonia nitrogen removal tank in the rainy season, and to transport agricultural non-point source sewage in the ecological paddy field to the farmland for irrigation in the dry season;

[0009] The two sides of the top of the magnetic coagulation reaction tank are respectively connected to the ammonia nitrogen removal tank and the inclined plate sedimentation tank, and are used to carry out magnetic coagulation reaction on the agricultural non-point source sewage from which ammonia nitrogen has been removed in the ammonia nitrogen removal tank and then transport it to the inclined plate sedimentation tank for sedimentation;

[0010] The magnetic separation system comprises a magnetic recovery pump, a magnetic separator, a high shear machine and a sludge tank, wherein the high shear machine is used to break up the magnetic coagulation sludge obtained at the sludge outlet of the inclined plate sedimentation tank; the magnetic separator is used to separate the broken magnetic coagulation sludge into magnetic powder and sludge; the magnetic recovery pump is used to transport the magnetic powder to the magnetic coagulation reaction tank, and the sludge is transported to the sludge tank;

[0011] The sludge dewatering system is used to dewater the sludge in the sludge pool, and the water removed from the sludge is discharged into the ecological paddy field.

[0012] Preferably, the ammonia nitrogen removal tank comprises an ammonia nitrogen removal agent dosing device and a No. 1 stirring tank, and the ammonia nitrogen removal agent dosing device is used to add the ammonia nitrogen removal agent into the No. 1 stirring tank.

[0013] Preferably, the magnetic coagulation reaction tank includes stirring tank No. 2, stirring tank No. 3, stirring tank No. 4, a PAC dosing device and a PAM dosing device; the PAC dosing device is used to add PAC into stirring tank No. 2, and the PAM dosing device is used to add PAM into stirring tank No. 4; the top sides of stirring tank No. 3 are respectively connected to the tops of stirring tank No. 2 and stirring tank No. 4.

[0014] Preferably, a single-shaft stirrer is provided in each of the stirring tank No. 1, the stirring tank No. 2, the stirring tank No. 3 and the stirring tank No. 4.

[0015] Preferably, the inner walls of the No. 1 stirring tank, the No. 2 stirring tank, the No. 3 stirring tank and the No. 4 stirring tank are all provided with baffle plates.

[0016] Preferably, the slope of the bottom of the inclined plate sedimentation tank is 5° to 15°, and the center of the bottom of the tank is a mud hopper; a scraper is provided in the inclined plate sedimentation tank; an inclined plate filler is provided above the scraper of the scraper, the length of the inclined plate filler is 1 meter, and the installation angle of the inclined plate filler is 60°.

[0017] Preferably, the magnetic separation system further comprises a sludge return pump, and the sludge return pump is used to transport the magnetic coagulation sludge that has not been processed by the magnetic separator and the high shear machine to the magnetic coagulation reaction tank.

[0018] Preferably, the sludge dewatering system comprises a sludge pump, a screw press sludge dewatering machine and a sludge dewatering dosing device, and the sludge pump is used to transport the sludge in the sludge pool to the screw press sludge dewatering machine.

[0019] Preferably, an inlet flow meter and an inlet ammonia nitrogen detector are also installed at the outlet end of the inlet lift pump; the sludge dewatering system also includes a sludge dewatering pipeline flow meter.

[0020] Preferably, it also includes a PLC control system, which obtains data from the water inlet flow meter, the water inlet ammonia nitrogen detector and the sludge dewatering pipeline flow meter and sends them to a remote terminal, and the remote terminal is used to remotely control the ammonia nitrogen removal tank, the magnetic coagulation reaction tank and the sludge dewatering system.

[0021] Compared with the prior art, the utility model has the following beneficial effects:

[0022] 1. The utility model can treat farmland drainage mixed with part of domestic sewage to the surface water IV standard;

[0023] 2. The advantages of this device are that it uses ammonia nitrogen removers to remove ammonia nitrogen and part of dissolved COD in water, can start quickly and has high reaction efficiency; it uses magnetic coagulation technology to remove TP, SS and non-dissolved COD, with high treatment capacity and low reagent consumption;

[0024] 3. The PLC control cabinet interlocks and controls the equipment to run automatically, and the signal can be transmitted to the intelligent terminal for remote operation, reducing the labor cost of equipment operation and maintenance;

[0025] 4. The water inlet lifting pump is equipped with double outlets. During the dry season, the water discharged from the farmland can be lifted to the water conservancy irrigation system for sewage irrigation and reuse, realizing the resource utilization of sewage. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the equipment of the present utility model.

[0027] Among them: 100, water inlet lifting pump; 200, ammonia nitrogen removal tank; 201, ammonia nitrogen remover dosing device; 202, No. 1 stirring tank; 300, magnetic coagulation reaction tank; 301, No. 2 stirring tank; 302, No. 3 stirring tank; 303, No. 4 stirring tank; 304, PAC dosing device; 305, PAM dosing device; 400, inclined plate sedimentation tank; 500, magnetic separation system; 501, magnetic recovery pump; 502, sludge return pump; 503, magnetic separator; 504, high shear machine; 505; sludge tank; 600, sludge dewatering system; 601, sludge pump; 602, spiral sludge dewatering machine; 603, sludge dewatering dosing device. DETAILED DESCRIPTION

[0028] A system for improving the water quality of agricultural non-point source sewage: comprising a water inlet booster pump 100, an ammonia nitrogen removal tank 200, a magnetic coagulation reaction tank 300, an inclined plate sedimentation tank 400, a magnetic separation system 500 and a sludge dewatering system 600;

[0029] The inlet lift pump can switch its function according to the final destination of the sewage. In the rainy season, the agricultural non-point source sewage mixed with farmland drainage and initial rainwater collected in the ecological paddy field is lifted to the water quality lifting equipment for water purification before being discharged into the river. In the dry season, the outlet of the inlet lift pump is bypassed and lifted to the farmland irrigation system for irrigation reuse.

[0030] The ammonia nitrogen removal tank 200 includes an ammonia nitrogen removal agent dosing device 201 and a No. 1 stirring tank 202; the ammonia nitrogen removal agent dosing device 201 is used to add the ammonia nitrogen removal agent; a single-shaft mixer is arranged in the No. 1 stirring tank, and a baffle is arranged on the inner wall of the No. 1 stirring tank. The baffle is used to increase the reaction time of the sewage in the stirring tank.

[0031] In the rainy season, the sewage is treated with ammonia nitrogen removal tank: ammonia nitrogen removal agent is added to remove ammonia nitrogen through oxidation and adsorption. The ammonia nitrogen removal agent (conventional, hypochlorite) / ammonia nitrogen mass ratio is set to 3.5-4.5 / 1. In order to extend the ammonia nitrogen removal reaction time, the ammonia nitrogen removal agent is added to the 1# stirring tank at the front end of the system, and the total hydraulic retention time is 35 minutes. (2000T / d, chemical reaction, the reaction is faster than the biochemical reaction).

[0032] The magnetic coagulation reaction tank 300 includes a stirring tank No. 2 301, a stirring tank No. 3 302, a stirring tank No. 4 303, a PAC dosing device 304 and a PAM dosing device 305; a single-shaft stirrer is provided in each of the stirring tanks No. 2, 3 and 4, and a baffle plate is provided on the inner wall of each of the tanks; the magnetic coagulation reaction is to flocculate pollutants, water treatment agents and magnetic powder in water to form large and dense flocs;

[0033] PAC is added into the No. 2 mixing tank through the PAC dosing device, the return sludge and return magnetic powder are returned to the No. 3 mixing tank, and PAM is added into the No. 4 mixing tank through the PAM dosing device; PAM is polyacrylamide and PAC is polyaluminium chloride.

[0034] Coagulation reaction: The coagulation reaction includes three stages, namely, adding PAC to the No. 2 mixing tank, adding return magnetic powder and return sludge to the No. 3 mixing tank, and adding PAM to the No. 4 mixing tank; the PAC dosage is 20 mg / L, the magnetic powder concentration is 10-20 mg / L, the return sludge concentration is 150-200 mg / L, the PAM dosage is 0.5-1 mg / L, and the total coagulation reaction time is 9 minutes.

[0035] The bottom of the inclined plate sedimentation tank 400 is a conical structure, specifically, a slope of 5° to 15° towards the mud bucket located in the center; a mud scraper is arranged in the inclined plate sedimentation tank; an inclined plate filler is arranged above the scraper, the filler is 1 meter long and the installation angle is 60°; a triangular weir plate water collection weir is arranged at the upper part, and the supernatant after sedimentation is collected and discharged into the nearest river; the mud scraper is used to remove the sludge settled at the bottom of the tank;

[0036] The sewage stays in the inclined plate sedimentation tank for 15 minutes and the surface load is 5.5m 3 / (m 2 h), the scraper speed is 1rpm.

[0037] The magnetic separation system 500 includes a magnetic recovery pump 501, a sludge return pump 502, a magnetic separator 503, a high shear machine 504 and a sludge tank 505; the high shear machine is used to break up the magnetic coagulation sludge obtained from the sludge outlet of the inclined plate sedimentation tank; the magnetic separator is used to separate the broken magnetic coagulation sludge into magnetic powder and sludge; the magnetic powder enters the No. 3 stirring tank of the magnetic coagulation reaction tank, and the sludge is discharged into the sludge tank for temporary storage, and the excess magnetic coagulation sludge is directly returned to the No. 3 stirring tank through the sludge return pump;

[0038] The magnetic recovery pump sends the magnetic coagulation sludge from the mud hopper of the sedimentation tank to the high shear machine for separation of magnetic powder and sludge, and then enters the magnetic separator for magnetic powder recovery and reflux. After separation, the sludge enters the sludge tank for temporary storage; the sludge return pump puts part of the sludge back into the No. 3 mixing tank. The designed processing capacity of the magnetic recovery and separation system is 2m 3 / h, the operation / interval time is 10min / 20min. Both the magnetic recovery pump and the sludge return pump are equipped with a main unit and a standby unit, and the standby unit is used when the main unit fails. When the influent SS is greater than 200mg / L, the sludge return pump will not start.

[0039] The sludge dewatering system 600 includes a sludge pump 601, a screw press sludge dewatering machine 602 and a sludge dewatering dosing device 603. The dewatered sludge is bagged and transported out, and the wastewater generated during the dewatering process is discharged into the ecological paddy field for temporary storage;

[0040] A radar level gauge is installed in the sludge pool. When the sludge level reaches the set value, the system alarms and the sludge pump needs to be manually turned on the spot. The sludge pump flow rate is 5m 3 / h, set up a bypass return system, set up a flow meter and an electric regulating valve on the sludge conveying pipeline, and adjust the flow rate by setting the valve opening and closing degree. The mud dehydration dosing device is interlocked with the mud conveying pipeline flow meter to adjust the dosage according to the amount of mud input. The dosage of cationic PAM is 0.2% (based on absolute dry sludge).

[0041] In one embodiment of a system for improving the quality of agricultural non-point source sewage, a PLC control system is also included. Figure 1 Not shown, the PLC control system can interlock and adjust the ammonia nitrogen remover dosing device according to the parameters of the water inlet flow meter of the water inlet lift pump and the water inlet ammonia nitrogen detector, and can realize the operation of the equipment on-site control cabinet and remote terminal.

[0042] Except for the sludge dewatering system and chemical configuration, the operation of other equipment is basically fully automated, and can be operated locally and remotely; the interlocking operation relationships include: the radar level meter of the ecological paddy field is interlocked with the water inlet lift pump, the water inlet pipeline flow meter / water inlet ammonia nitrogen detector is interlocked with the ammonia nitrogen remover dosing device, the water inlet flow meter is interlocked with the PAC dosing device and the PAM dosing device, the sludge dewatering pipeline flow meter in the sludge dewatering system is interlocked with the sludge dewatering dosing device, and the radar level meter of the sludge pool is interlocked with the sludge pump / alarm.

[0043] like Figure 1 As shown, the following is the operation process of the utility model:

[0044] The utility model is designed to meet the requirements of farmland drainage and discharge into natural water bodies. The agricultural non-point source sewage water quality improvement system includes a water treatment system and a sludge treatment system. The water inlet lifting pump lifts the farmland drainage to the equipment for treatment in the rainy season, and lifts the farmland drainage to the farmland water conservancy system for irrigation and reuse in the dry season. The mixing tank includes 4 separate mixing tanks with mechanical stirring, which operate in series.

[0045] In the rainy season, agricultural sewage reaches the mixing tank through the water inlet lifting pump, and the ammonia nitrogen remover dosing device adds the ammonia nitrogen remover to the No. 1 mixing tank, the PAC dosing device adds PAC to the No. 2 mixing tank, and the PAM dosing device adds PAM to the No. 4 mixing tank; agricultural non-point source sewage enters the inclined plate sedimentation tank after mixing, dosing and coagulation in the mixing tank. A triangular weir is set on the upper part of the inclined plate sedimentation tank. The supernatant after sedimentation is collected and discharged into the nearest river; the bottom of the inclined plate sedimentation tank The magnetic coagulation sludge is obtained. After the magnetic powder and sludge are separated by the high shear machine and the magnetic separator, the magnetic powder enters the No. 3 stirring tank of the magnetic coagulation reaction tank, and the sludge is discharged into the sludge tank for temporary storage. The excess magnetic coagulation sludge is directly returned to the No. 3 stirring tank through the sludge return pump; the sludge in the sludge tank is sent to the screw press sludge dewatering machine through the sludge pump, and at the same time, the sludge dewatering agent dosing device synchronously adds the sludge dewatering agent, and the mud cake after sludge dehydration is bagged and transported out, and the filter press wastewater is discharged into the ecological paddy field;

[0046] The PLC controller interlocks and adjusts the ammonia nitrogen remover, PAC, PAM dosing frequency conversion pump according to the parameters of the inlet flow meter and the inlet ammonia nitrogen detector. The sludge dewatering system is manually started in response to the high liquid level alarm in the sludge pool. Local operations can be performed on the digital display screen of the control cabinet and transmitted to the smart terminal through a signal generator - remote operation can be performed through the equipment control system APP on a mobile phone or computer.

[0047] Example

[0048] The equipment of the utility model is used to treat farmland drainage. The specific water quality of farmland drainage is: SS: 105±12mg / L; pH: 7.2±0.4, COD: 65±15mg / L; ammonia nitrogen: 8.4±2.1mg / L; TP: 1.6±0.3mg / L; the specific implementation cases are as follows:

[0049] The water inlet pump lifts the farmland drainage water collected in the ecological paddy field to the equipment, with a water inlet flow of 100m 3 / h, the equipment operates at room temperature. This embodiment is located in Yuxi City, Yunnan Province, with a water temperature of 15-22°C in summer and 7-12°C in winter.

[0050] Add 10% ammonia nitrogen remover emulsion into the No. 1 stirring tank, the dosage is 25-35 mg / L, adjusted according to the ammonia nitrogen concentration of the influent, the agent has both oxidation and adsorption effects, can directly oxidize ammonia nitrogen in the wastewater into nitrogen, and absorb part of ammonia nitrogen and dissolved COD at the same time, the mechanical stirring speed is 65 rpm, the stirring intensity is 15 W / m 3 .

[0051] Add 10% PAC solution into stirring tank No. 2, the dosage is 20 mg / L, the mechanical stirring speed is 65 rpm, and the stirring intensity is 15 W / m 3 ; Add return magnetic powder and return sludge in the 3# stirring tank, maintain the concentration of magnetic powder in the 3# stirring tank at 10-20mg / L, the concentration of suspended sludge at 150-200mg / L, the mechanical stirring speed at 65rpm, and the stirring intensity at 15W / m 3 ; Add 0.2% PAM solution into stirring tank No. 4, the dosage is 0.5-1mg / L, the mechanical stirring speed is 30rpm, and the stirring intensity is 7W / m 3 ; The surface load of the inclined plate sedimentation tank is 5.5m 3 / (m 2 h), the scraper speed is 1 rpm; the ammonia nitrogen oxidation reaction time is 35 min, the coagulation reaction time is 9 min, and the hydraulic retention time of the sedimentation tank is 15 min.

[0052] After separation by the magnetic separator, the sludge is sent to the sludge pool. A radar level gauge is installed in the sludge pool. When the sludge level reaches the set value, an alarm is triggered and the sludge dewatering system is started manually. The sludge dewatering agent uses cationic PAM, the prepared solution concentration is 0.2%, and the dosage is 0.2% (PAM / absolutely dry sludge). The sludge dewatering machine uses a DL251 screw-type sludge dewatering machine. The dewatered cake is bagged and transported out, and the waste liquid generated by sludge dehydration is discharged into the ecological paddy field.

[0053] The experimental results show that COD in farmland drainage is mostly in suspended and colloidal state, and the removal rate through coagulation and sedimentation can reach 67.7%, the ammonia nitrogen oxidation removal rate can reach 85.7%, and the TP coagulation removal rate can reach 95%; farmland drainage stays in ecological paddy fields for a long time, and the silt and other abandoned crop residues carried in the drainage water are deposited at the bottom of the pool. However, due to the high concentration of nutrients in the water, algae are rampant, causing the SS concentration of the equipment inlet water to increase. The sludge after dehydration treatment is dark green, and the main component is algae. The moisture content of the dehydrated water cake is 65-73%.

[0054] Table 1 Concentration of each component in effluent (mg / L)

[0055] COD Ammonia nitrogen TP SS pH Water Intake 65±15 8.4±2.1 1.6±0.3 105±12 7.2±0.4 Water 21±3.5 1.2±0.15 0.08±0.02 8±1.5 8.3±0.3 Average removal rate 67.7％ 85.7％ 95％ 94.8％ /

Claims

1. A system for improving the quality of agricultural non-point source sewage, characterized by: It comprises an inlet lift pump (100), an ammonia nitrogen removal tank (200), a magnetic coagulation reaction tank (300), an inclined plate sedimentation tank (400), a magnetic separation system (500) and a sludge dewatering system (600); wherein: The water inlet lift pump (100) is used to transport agricultural non-point source sewage to the ammonia nitrogen removal tank (200) in the rainy season, and to transport agricultural non-point source sewage in the ecological paddy field to the farmland for irrigation in the dry season; The two sides of the top of the magnetic coagulation reaction tank (300) are respectively connected to the ammonia nitrogen removal tank (200) and the inclined plate sedimentation tank (400), and are used to carry out magnetic coagulation reaction on the agricultural non-point source sewage from which ammonia nitrogen has been removed in the ammonia nitrogen removal tank (200), and then transport the sewage to the inclined plate sedimentation tank (400) for sedimentation; The magnetic separation system (500) comprises a magnetic recovery pump (501), a magnetic separator (503), a high shear machine (504) and a sludge tank (505); the high shear machine (504) is used to break up the magnetic coagulation sludge obtained at the sludge outlet of the inclined plate sedimentation tank (400); the magnetic separator (503) is used to separate the broken magnetic coagulation sludge into magnetic powder and sludge; the magnetic recovery pump (501) is used to transport the magnetic powder to the magnetic coagulation reaction tank (300), and the sludge is transported to the sludge tank (505); The sludge dewatering system (600) is used to dewater the sludge in the sludge pool (505), and the water removed from the sludge is discharged into the ecological paddy field.

2. The agricultural non-point source sewage water quality improvement system according to claim 1 is characterized by: The ammonia nitrogen removal tank (200) comprises an ammonia nitrogen removal agent dosing device (201) and a No. 1 stirring tank (202), wherein the ammonia nitrogen removal agent dosing device (201) is used to add the ammonia nitrogen removal agent into the No. 1 stirring tank (202).

3. The agricultural non-point source sewage water quality improvement system according to claim 2 is characterized by: The magnetic coagulation reaction pool (300) comprises a stirring pool No. 2 (301), a stirring pool No. 3 (302), a stirring pool No. 4 (303), a PAC dosing device (304) and a PAM dosing device (305); the PAC dosing device is used to add PAC into the stirring pool No. 2, and the PAM dosing device is used to add PAM into the stirring pool No. 4; the top sides of the stirring pool No. 3 (302) are respectively connected to the tops of the stirring pool No. 2 (301) and the tops of the stirring pool No. 4 (303).

4. The agricultural non-point source sewage water quality improvement system according to claim 3 is characterized by: Single-shaft stirrers are arranged in the No. 1 stirring tank (202), the No. 2 stirring tank (301), the No. 3 stirring tank (302) and the No. 4 stirring tank (303).

5. The agricultural non-point source sewage water quality improvement system according to claim 3 is characterized by: The inner walls of the No. 1 stirring tank (202), the No. 2 stirring tank (301), the No. 3 stirring tank (302) and the No. 4 stirring tank (303) are all provided with baffle plates.

6. The agricultural non-point source sewage water quality improvement system according to claim 1 is characterized by: The slope of the bottom of the inclined plate sedimentation tank (400) is 5° to 15°, and the center of the bottom of the tank is a mud bucket; a mud scraper is arranged in the inclined plate sedimentation tank; an inclined plate filler is arranged above the scraper of the mud scraper, the inclined plate filler is 1 meter long, and the installation angle of the inclined plate filler is 60°.

7. The agricultural non-point source sewage water quality improvement system according to claim 1 is characterized by: The magnetic separation system (500) further comprises a sludge return pump (502), wherein the sludge return pump (502) is used to transport the magnetic coagulation sludge that has not been processed by the magnetic separator (503) and the high shear machine (504) to the magnetic coagulation reaction tank (300).

8. The agricultural non-point source sewage water quality improvement system according to claim 1 is characterized by: The sludge dewatering system (600) comprises a sludge pump (601), a screw press sludge dewatering machine (602) and a sludge dewatering dosing device (603). The sludge pump (601) is used to transport the sludge in the sludge pool (505) to the screw press sludge dewatering machine (602).

9. The agricultural non-point source sewage water quality improvement system according to claim 1, characterized in that: The outlet end of the water inlet lift pump is also equipped with a water inlet flow meter and a water inlet ammonia nitrogen detector; the sludge dewatering system (600) also includes a sludge dewatering pipeline flow meter.

10. The agricultural non-point source sewage water quality improvement system according to claim 9, characterized in that: It also includes a PLC control system, which obtains data from the water inlet flow meter, the water inlet ammonia nitrogen detector and the sludge dewatering pipeline flow meter and sends them to a remote terminal, and the remote terminal is used to remotely control the ammonia nitrogen removal tank (200), the magnetic coagulation reaction tank (300) and the sludge dewatering system (600).

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