Waste liquid treatment system

Abstract

The utility model provides a waste liquid treatment system. The waste liquid treatment system comprises a waste liquid collection tank, a pipeline reaction device, a centralized reaction device, a precipitation separation device and an automatic control device, the waste liquid collecting pool is used for collecting waste liquid; the pipeline reaction device is communicated with the waste liquid collecting tank, so that waste liquid enters the pipeline reaction device for primary reaction; the centralized reaction device is communicated with the pipeline reaction device, so that the waste liquid enters the centralized reaction device for deep reaction; the precipitation separation device is communicated with the centralized reaction device, so that the reacted waste liquid is subjected to precipitation separation, and intermediate water and sludge are obtained; the automatic control device is electrically connected with the waste liquid collecting tank and the pipeline reaction device respectively to control liquid feeding and liquid discharging of the waste liquid collecting tank and the pipeline reaction device. According to the waste liquid treatment system, the pipeline reaction device and the centralized reaction device are combined, so that the mixing between the waste liquid and the medicament can be enhanced, the treatment effect of the waste liquid can be improved, the effluent quality is good, and the occupied area is greatly saved.

Description

Technical Field

[0001] The utility model belongs to the technical field of comprehensive treatment and reuse of waste liquid, and particularly relates to a waste liquid treatment system. Background Art

[0002] In the pre-treatment process of automobile painting, the phosphating section needs to frequently empty the tank to clean phosphating slag, and the phosphating slag filtration system also uses clean water for flushing. Therefore, a certain amount of high-concentration phosphating waste liquid will be generated. The chemical composition of the phosphating waste liquid is quite complex, characterized by high phosphorus, high salt, and containing heavy metal pollutant nickel of category I. Once it enters the water body, it will cause serious pollution to the water environment, seriously threatening the production and life of human beings and the ecological balance of nature.

[0003] At present, the treatment systems for high-concentration phosphating waste liquid generally have defects such as poor treatment effect, large floor area, and low automation degree. Therefore, further research on the treatment of phosphating waste liquid is needed in this field. Summary of the Utility Model

[0004] The main purpose of the utility model is to provide a waste liquid treatment system to overcome the defects such as poor treatment effect of the waste liquid treatment system in the prior art.

[0005] To achieve the above purpose, the utility model provides a waste liquid treatment system, including:

[0006] A waste liquid collection tank for collecting waste liquid;

[0007] A pipeline reaction device communicated with the waste liquid collection tank to enable the waste liquid to enter the pipeline reaction device for preliminary reaction;

[0008] A centralized reaction device communicated with the pipeline reaction device to enable the waste liquid to enter the centralized reaction device for deep reaction;

[0009] A precipitation separation device communicated with the centralized reaction device to enable the reacted waste liquid to be precipitated and separated to obtain intermediate water and sludge;

[0010] An automatic control device electrically connected to the waste liquid collection tank and the pipeline reaction device respectively to control its liquid inlet and outlet.

[0011] In one embodiment, the waste liquid treatment system of the utility model further includes:

[0012] A filtering device communicated with the precipitation separation device, and a filtering medium is arranged in the filtering device to enable the intermediate water to enter the filtering device and be filtered under the action of the filtering medium;

[0013] The reclaimed water storage device is communicated with the filtration device to convey the filtered intermediate water to the reclaimed water storage device for storage.

[0014] In one embodiment, the waste liquid treatment system of the present utility model further includes:

[0015] A sludge thickening tank, which is communicated with the precipitation separation device, so that the sludge flows into the sludge thickening tank for further precipitation;

[0016] A sludge dewatering device, which is communicated with the sludge thickening tank to convey the further precipitated sludge to the sludge dewatering device for dewatering.

[0017] In one embodiment of the waste liquid treatment system of the present utility model, the sludge dewatering device is communicated with the waste liquid collection tank, the dewatered sludge is discharged from the system, and the removed liquid is recycled back to the waste liquid collection tank.

[0018] In one embodiment of the waste liquid treatment system of the present utility model, the pipeline reaction device is an "S"-shaped pipeline; the pipeline reaction device is communicated with the dosing device; and a mixing plate is arranged in the pipeline reaction device.

[0019] In one embodiment of the waste liquid treatment system of the present utility model, the pipeline diameter at the place where the mixing plate is arranged in the pipeline reaction device is larger than the pipeline diameter at the place where the mixing plate is not arranged.

[0020] The waste liquid treatment system of the present utility model is characterized in that a pH monitor is arranged at the liquid inlet of the pipeline reaction device, an ORP monitor is arranged at the liquid outlet of the pipeline reaction device, and the automatic control device is electrically connected to the pH monitor, the ORP monitor and the dosing device respectively, so as to transmit the monitoring values of the pH monitor and the ORP monitor to the automatic control device, and the automatic control device adjusts the dosing amount of the dosing device according to the monitoring values.

[0021] In one embodiment, the waste liquid treatment system of the present utility model further includes an intermediate water tank;

[0022] The precipitation separation device is communicated with the lower part of the centralized reaction device, so that the reacted waste liquid flows into the precipitation separation device by gravity;

[0023] The precipitation separation device is communicated with the intermediate water tank, so that the intermediate water enters the intermediate water tank by overflow;

[0024] The intermediate water tank is communicated with the filtration device, so that the intermediate water enters the filtration device for filtration.

[0025] In the waste liquid treatment system of the present utility model, in one embodiment, liquid level monitors are respectively arranged in the waste liquid collection tank and the reclaimed water storage device, and each liquid level monitor is electrically connected to the automatic control device to transmit the monitored liquid level to the automatic control device. The automatic control device controls the liquid inlet and outlet of the waste liquid collection tank and the reclaimed water storage device respectively according to the liquid level.

[0026] In the waste liquid treatment system of the present utility model, in one embodiment, the bottom of the precipitation and separation device is conical; a liquid level monitor is arranged in the sludge thickening tank, and a pressure monitor is arranged in the sludge dewatering device. The liquid level monitor and the pressure monitor are respectively electrically connected to the automatic control device to transmit the monitored liquid level or pressure to the automatic control device. The automatic control device controls the feeding and discharging of the sludge thickening tank according to the liquid level and controls the dewatering conditions of the sludge dewatering device according to the pressure.

[0027] The beneficial effects of the present utility model:

[0028] The present utility model combines the pipeline reaction device and the centralized reaction device, which can not only strengthen the mixing between the waste liquid and the reagent, but also improve the treatment effect of the waste liquid, and greatly save the floor area.

[0029] Through the setting of the automatic control device, the present utility model can improve the automation degree of the system and make the system more stable. Description of the Drawings

[0030] Figure 1 It is a schematic diagram of the waste liquid treatment system according to the first embodiment of the present utility model;

[0031] Figure 2 It is a schematic diagram of the waste liquid treatment system according to the second embodiment of the present utility model;

[0032] Figure 3 It is a schematic diagram of the waste liquid treatment system according to the third embodiment of the present utility model.

[0033] Among them, reference numerals:

[0034] 1 Waste liquid collection tank

[0035] 2 Pipeline reaction device

[0036] 3 Centralized reaction device

[0037] 4 Precipitation and separation device

[0038] 5 Filter device

[0039] 6 Reclaimed water storage device

[0040] 7 Sludge thickening tank

[0041] 8 Sludge dewatering device

[0042] 9, 18, 19 Lift pumps

[0043] 10, 13, 14, 15 Liquid level monitors

[0044] 11 pH monitor

[0045] 12 ORP monitor

[0046] 16 Pressure monitor

[0047] 17 Automatic control device

[0048] 20 Intermediate water tank

[0049] 21 Chemical dosing joint

[0050] 22 Mixing flow plate

[0051] 23, 24, 25 Maintenance union

[0052] 26 Flow control valve

[0053] 27 Flow meter Detailed implementation manners

[0054] In order to make the objectives, technical solutions and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model. On the contrary, the present utility model covers any alternatives, modifications, equivalent methods and solutions made within the spirit and scope of the present utility model as defined by the claims. Further, in order to enable the public to have a better understanding of the present utility model, in the following detailed description of the present utility model, some specific details are described in detail. Those skilled in the art can fully understand the present utility model without the description of these details.

[0055] The present utility model provides a waste liquid treatment system, which is mainly used for treating phosphorus-containing waste liquid. More specifically, it can be used for treating phosphorus-containing waste liquid obtained in the phosphating section of the pre-treatment process for automobile painting. As Figure 1 shown, the waste liquid treatment system according to the first embodiment of the present utility model includes a waste liquid collection tank 1, a pipeline reaction device 2, a centralized reaction device 3, a precipitation separation device 4 and an automatic control device 17.

[0056] Among them, the waste liquid collection pool 1 is used to collect waste liquid. Different concentrations of phosphorus-containing waste liquid can be mixed in the waste liquid collection pool 1. The waste liquid collection pool 1 is electrically connected to the automatic control device 17. In this way, the automatic control device 17 can control the liquid inlet and outlet of the waste liquid collection pool 1. The present utility model does not particularly limit the waste liquid collection pool 1. In an embodiment, a liquid level monitor 10 is arranged in the waste liquid collection pool 1, and the liquid level monitor 10 is electrically connected to the automatic control device 17. Thus, the liquid level of the waste liquid collection pool 1 monitored by the liquid level monitor 10 can be transmitted to the automatic control device 17 in real time, and the automatic control device 17 controls the liquid inlet and outlet conditions of the waste liquid collection pool 1 according to the monitored liquid level.

[0057] Among them, the pipeline reaction device 2 is communicated with the waste liquid collection pool 1 so that the waste liquid enters the pipeline reaction device 2 for preliminary reaction. The pipeline reaction device 2 is electrically connected to the automatic control device 17. In this way, the automatic control device 17 can control the liquid inlet and outlet of the pipeline reaction device 2. In an embodiment, the waste liquid in the waste liquid collection pool 1 is transported to the pipeline reaction device 2 by a lift pump 9.

[0058] In an embodiment, the pipeline reaction device 2 is communicated with a dosing device (not shown in the figure). Specifically, it can be communicated with the dosing device through a dosing joint 21. In another embodiment, the dosing device is electrically connected to the automatic control device 17. In this way, the automatic control device 17 can control the dosing amount of the dosing device.

[0059] In an embodiment, a pH monitor 11 is arranged at the liquid inlet of the pipeline reaction device 2, and an ORP monitor 12 is arranged at the liquid outlet of the pipeline reaction device 2. The automatic control device 17 is electrically connected to the pH monitor 11, the ORP monitor 12 and the dosing device respectively to transmit the monitoring values of the pH monitor 11 and the ORP monitor 12 to the automatic control device 17. The automatic control device 17 adjusts the dosing amount of the dosing device according to the monitoring values. The present utility model does not particularly limit the types of agents added to the pipeline reaction device 2, and corresponding agents can be added according to the reaction type and requirements. Among them, the ORP monitor 12 monitors, for example, the concentration changes of metal cations such as ionic zinc, nickel, and manganese in the waste liquid entering the pipeline reaction device 2 to guide the dosing amount of the agent.

[0060] Through the settings of the pH monitor 11 and the ORP monitor 12, under the condition of constant pH, the ORP value of the waste liquid in the pipeline reaction device 2 is interlocked with the dosing device. The analog signals of pH, ORP, and the dosing device are all sent to the automatic control device, which will automatically control the start and stop of the dosing device according to the level of ORP. The response times of pH, ORP, the automatic control device, and the industrial control computer are short, and the reaction speed is fast. It not only improves the dosing accuracy but also the production efficiency, and greatly reduces the production cost and the labor intensity of workers. It is a very ideal control system. Due to the strong scalability of the automatic control device, when adding control tasks in the future, there is no need to add the entire PLC system. Only by expanding the corresponding expansion modules can the performance-price ratio of the system be greatly enhanced.

[0061] In one embodiment, the pipeline reaction device 2 is an "S"-shaped pipeline, which can make the waste liquid and the reagent fully mixed and reacted, and can also save the floor area. In another embodiment, a mixing plate 22 is arranged in the pipeline reaction device 2, which can further improve the mixing degree of the waste liquid and the reagent. The present utility model does not particularly limit the setting mode of the mixing plate, and any setting mode in the art can be used. In yet another embodiment, the pipeline diameter at the location where the mixing plate 22 is arranged in the pipeline reaction device 2 is larger than the pipeline diameter at the location where the mixing plate is not arranged. The diameter change of the pipeline reaction device can further promote the mixing state of the waste liquid and the reagent.

[0062] In one embodiment, the pipeline reaction device 2 can also be provided with maintenance unions 23, 24, 25, a flow regulating valve 26, a flowmeter 27, etc., but the present utility model is not limited thereto.

[0063] The pipeline reaction device is a high-efficiency mixing device and reaction device without electric stirring components. Through the mixing plate fixed in the pipe, two or more fluid streams are caused to generate fluid stratification shearing, folding, cutting, and re-mixing, so that the fluid continuously changes the mixing flow direction, not only pushing the surrounding fluid towards the center but also pushing the central fluid flow towards the periphery, achieving the purpose of good dispersion, full mixing, and reaction between the added reagent and the waste liquid to be treated in a three-dimensional space. The working principle of the pipeline reaction device is to make the fluid flow in the pipeline and impact various types of plate elements to generate variable-direction mixing flow, increasing the turbulence phenomenon between fluids. In the laminar flow state, it is "division - position movement - re-convergence". In the turbulent flow state, in addition to the above three situations, the fluid will also generate intense eddies in the cross-sectional direction, with a strong shearing force acting on the fluid, further dividing and mixing the fluid to achieve the purpose of full mixing and reaction. In addition, it can also save the floor area.

[0064] Among them, the centralized reaction device 3 is connected to the pipeline reaction device 2 so that the waste liquid enters the centralized reaction device 3 for further reaction. The utility model combines the pipeline reaction device and the centralized reaction device, which can not only strengthen the mixing between the waste liquid and the reagent, but also improve the treatment effect of the waste liquid, and greatly save the floor area.

[0065] In one embodiment, the liquid outlet of the pipeline reaction device 2 is higher than the liquid inlet of the centralized reaction device 3. In this way, the waste liquid of the pipeline reaction device 2 can flow into the centralized reaction device 3 under the action of gravity.

[0066] The utility model does not particularly limit the centralized reaction device 3. In one embodiment, air is blown into the centralized reaction device 3 for stirring.

[0067] Among them, the precipitation separation device 4 is connected to the centralized reaction device 3 so that the reacted waste liquid is subjected to precipitation separation to obtain intermediate water and sludge.

[0068] In one embodiment, the precipitation separation device 4 is connected to the lower part of the centralized reaction device 3 so that the reacted waste liquid in the centralized reaction device 3 flows into the precipitation separation device 4 under the action of gravity. In another embodiment, the bottom of the precipitation separation device 4 is conical, so that the reacted waste liquid can more easily deposit sludge at the bottom of the precipitation separation device 4. The cone can be, for example, a cone, a triangular pyramid, a quadrangular pyramid, etc., and the utility model does not make a particular limitation.

[0069] The waste liquid treatment system of the second embodiment of the utility model is as Figure 2 shown, and further includes a filtering device 5 and a reused water storage device 6. The rest is similar to the first embodiment, and the similarities will not be elaborated here.

[0070] Among them, the filtering device 5 is connected to the precipitation separation device 4, and a filtering medium is arranged in the filtering device 5 so that the intermediate water enters the filtering device 5 and is filtered under the action of the filtering medium. The utility model does not particularly limit the filtering medium, which can be selected according to needs.

[0071] The reused water storage device 6 is connected to the filtering device 5 to transport the filtered intermediate water to the reused water storage device 6 for storage. The reused water in the reused water storage device 6 can be recycled to save water resources. In one embodiment, a liquid level monitor 14 is arranged in the reused water storage device 6. The liquid level monitor 14 is electrically connected to the automatic control device 17, and the reused water storage device 6 is electrically connected to the automatic control device 17 to transmit the monitored liquid level of the liquid level monitor 14 to the automatic control device 17 in real time, and the automatic control device 17 controls the liquid inlet and outlet of the reused water storage device 6 according to the monitored liquid level.

[0072] In one embodiment, the waste liquid treatment system of the present utility model further includes an intermediate water tank 20, which is respectively connected to the precipitation separation device 4 and the filtration device 5. In another embodiment, the intermediate water separated by the precipitation separation device 4 enters the intermediate water tank 20 through overflow. Specifically, the heights of two opposite side walls of the intermediate water tank 20 are different, and the intermediate water enters the intermediate water tank through the relatively lower side wall. The intermediate water in the intermediate water tank 20 can be transported to the filtration device 5 by a lift pump 18.

[0073] In yet another embodiment, a liquid level monitor 13 is provided in the intermediate water tank 20. The liquid level monitor 13 is electrically connected to the automatic control device 17, and the intermediate water tank 20 is electrically connected to the automatic control device 17 to transmit the monitored liquid level of the liquid level monitor 13 to the automatic control device 17 in real time. The automatic control device 17 controls the liquid inlet and outlet of the intermediate water tank 20 according to the monitored liquid level.

[0074] The waste liquid treatment system of the third embodiment of the present utility model is as Figure 3 shown, and further includes a sludge thickening tank 7 and a sludge dewatering device 8. The rest is similar to the first embodiment, and the similarities will not be elaborated here.

[0075] Among them, the sludge thickening tank 7 is connected to the precipitation separation device 4 so that the sludge flows into the sludge thickening tank 7 for further precipitation. The sludge dewatering device 8 is connected to the sludge thickening tank 7 to transport the further precipitated sludge to the sludge dewatering device 8 for dewatering treatment. In one embodiment, a lift pump 19 is provided between the sludge thickening tank 7 and the sludge dewatering device 8 to transport the sludge in the sludge thickening tank 7 to the sludge dewatering device 8.

[0076] In one embodiment, the sludge dewatering device 8 is connected to the waste liquid collection tank 1, the dehydrated sludge is discharged from the system, and the removed liquid can be recycled back to the waste liquid collection tank 1.

[0077] In one embodiment, a liquid level monitor 15 is provided in the sludge thickening tank 7. The liquid level monitor 15 is electrically connected to the automatic control device 17, and the sludge thickening tank 7 is electrically connected to the automatic control device 17 to transmit the monitored liquid level of the liquid level monitor 15 to the automatic control device 17 in real time. The automatic control device 17 controls the feeding and discharging of the sludge thickening tank 7 according to the monitored liquid level.

[0078] In one embodiment, a pressure monitor 16 is provided in the sludge dewatering device 8. The pressure monitor 16 is electrically connected to the automatic control device 17 to transmit the monitored pressure to the automatic control device 17, and the automatic control device 17 controls the dewatering conditions of the sludge dewatering device 8 according to the pressure.

[0079] Of course, in this embodiment, an intermediate water tank 20, a filtering device 5, a reclaimed water storage device 6, etc. in the second embodiment may also be provided, and the present utility model does not make special limitations.

[0080] In the present utility model, when the monitoring values of each liquid level monitor, pH monitor, ORP monitor, and pressure monitor reach the set upper and lower limits, an alarm program can be triggered, such as performing an audible and visual alarm.

[0081] The operation of the waste liquid treatment system of the present utility model can achieve real-time monitoring and automatic control. The automatic control system realizes automatic acquisition and control of the liquid level, flow rate, pressure, and pH in the entire process. The automatic control device can achieve dynamic display and real-time alarm, minimizing the number of on-duty personnel. It is composed of a programmable logic controller PLC, an industrial control computer, a touch screen, and on-site instrument equipment, integrating identification acquisition, communication calculation, and control display technologies, realizing centralized monitoring management and decentralized control. Each point of the PLC and the on-site control cabinet can work independently and stably, fundamentally improving the reliability of the system. The PLC collects all on-site analog signals and switch signals and can directly control on-site equipment. The industrial control computer establishes communication with the PLC through a communication cable and in accordance with corresponding standard protocols. Audible and visual alarms can be realized for abnormal process parameters and equipment states on the industrial control computer, the instrument, the flashing alarm, and the large-scale analog flow chart, timely reminding the operator to pay attention. When dangerous and abnormal states occur, the entire system will automatically control the equipment and perform interlock protection. For example: (1) There are audible and visual alarms for both the upper and lower limits of the liquid level in the waste liquid collection tank and it is interlocked with the corresponding pump; (2) There are audible and visual alarms for both the upper and lower limits of pH / ORP and it is interlocked with the corresponding valves and pumps; (3) There are audible and visual alarms for both the upper and lower limits of the pressure of the sludge dewatering device and it is interlocked with the corresponding valves and pumps; (4) When the pump or motor fails, there are audible and visual alarms and automatic switching occurs. The industrial control computer provides various data statistics on the operation status of the device (such as the cumulative operation time of the pump, the operator, the start time, the instantaneous flow rate, the cumulative flow rate, etc.) and classification reports. The reports can be printed according to various required time periods such as shifts, days, months, etc. It can clearly display the schematic diagram of the operation process of the wastewater treatment system and dynamically display the operation status of the wastewater treatment station. It includes the animation display of the operation of all pumps and mixers and the liquid flow in the pipeline, the real-time display of the measured values and set values of all detection instruments, the dynamic display of the liquid level in the water storage tank, the dynamic display of the liquid medicine in the medicine tank, the time operation display, etc.

[0082] In this utility model, the waste liquid is transported from the waste liquid collection tank 1 to the pipeline reaction device 2 by the lift pump 9. After mixing and reacting in the pipeline reaction device 2, it flows into the centralized reaction device 3 for further reaction. The water discharged from the centralized reaction device 3 flows into the precipitation separation device 4 for precipitation separation. The obtained intermediate water enters the intermediate water tank 20, and the sludge enters the sludge thickening tank 7. The intermediate water in the intermediate water tank 20 is transported to the filtration device 5 by the lift pump, and the water discharged from the filtration device 5 is transported to the reclaimed water storage device 6 for reuse. The sludge separated by the precipitation separation device 4 flows into the sludge thickening tank 7 for further precipitation separation, and the separated sludge is transported to the sludge dewatering device 8 by the lift pump 19 for drying treatment. During the implementation process, a certain elevation difference is adopted in the equipment layout, and the lifting of the wastewater only occurs in the three links where the lift pumps 9, 18, and 19 are located, and the other positions are gravity flows.

[0083] The wastewater treatment system of this utility model is mainly used for the purification treatment of water bodies contaminated by phosphating solution waste liquid, especially for the comprehensive treatment and reuse of phosphating solution waste liquid, and is particularly suitable for the purification and reuse of production wastewater / waste liquid containing phosphating waste liquid pollution in the surface treatment industry.

[0084] Certainly, this utility model can also have many other embodiments. Without departing from the spirit and essence of this utility model, those skilled in the art can make various corresponding changes and deformations according to this utility model, but these corresponding changes and deformations should all fall within the protection scope of the claims of this utility model.

Claims

1. A waste liquid treatment system, characterized in that, Comprising: A waste liquid collection tank for collecting waste liquid; A pipeline reaction device connected to the waste liquid collection tank so that the waste liquid enters the pipeline reaction device for preliminary reaction; A centralized reaction device connected to the pipeline reaction device so that the waste liquid enters the centralized reaction device for deepening reaction; A precipitation separation device connected to the centralized reaction device so that the reacted waste liquid is subjected to precipitation separation to obtain intermediate water and sludge; An automatic control device electrically connected to the waste liquid collection tank and the pipeline reaction device respectively to control its liquid inlet and outlet.

2. The waste liquid treatment system according to claim 1, characterized in that, Further comprising: A filtration device connected to the precipitation separation device, and a filter medium is provided in the filtration device so that the intermediate water enters the filtration device and is filtered under the action of the filter medium; A backwater storage device connected to the filtration device to convey the filtered intermediate water to the backwater storage device for storage.

3. The waste liquid treatment system according to claim 1, wherein Further comprising: A sludge thickening tank connected to the precipitation separation device so that the sludge flows into the sludge thickening tank for further precipitation; A sludge dewatering device connected to the sludge thickening tank to convey the further precipitated sludge to the sludge dewatering device for dewatering.

4. The waste liquid treatment system according to claim 3, wherein The sludge dewatering device is connected to the waste liquid collection tank, the dehydrated sludge is discharged from the system, and the removed liquid is circulated back to the waste liquid collection tank.

5. The waste liquid treatment system according to claim 1, characterized in that The pipeline reaction device is an "S"-shaped pipeline; the pipeline reaction device is connected to a dosing device; a mixing plate is provided in the pipeline reaction device.

6. The waste liquid treatment system according to claim 5, characterized in that, The pipeline diameter at the place where the mixing plate is provided in the pipeline reaction device is larger than the pipeline diameter at the place where the mixing plate is not provided.

7. The waste liquid treatment system according to claim 5, wherein A pH monitor is provided at the liquid inlet of the pipeline reaction device, an ORP monitor is provided at the liquid outlet of the pipeline reaction device, and the automatic control device is electrically connected to the pH monitor, the ORP monitor and the dosing device respectively to transmit the monitoring values of the pH monitor and the ORP monitor to the automatic control device, and the automatic control device adjusts the dosing amount of the dosing device according to the monitoring values.

8. The waste liquid treatment system according to claim 2, characterized in that Further comprising an intermediate water tank; The precipitation separation device is connected to the lower part of the centralized reaction device so that the reacted waste liquid flows into the precipitation separation device by gravity; The precipitation separation device is connected to the intermediate water tank so that the intermediate water enters the intermediate water tank by overflow; The intermediate water tank is connected to the filtration device so that the intermediate water enters the filtration device for filtration.

9. The waste liquid treatment system according to claim 2, wherein Liquid level monitors are respectively provided in the waste liquid collection tank and the backwater storage device, and each liquid level monitor is electrically connected to the automatic control device to transmit the monitored liquid level to the automatic control device, and the automatic control device respectively controls the liquid inlet and outlet of the waste liquid collection tank and the backwater storage device according to the liquid level.

10. The waste liquid treatment system according to claim 3, characterized in that, The bottom of the precipitation separation device is conical; a liquid level monitor is arranged in the sludge thickening tank, and a pressure monitor is arranged in the sludge dewatering device. The liquid level monitor and the pressure monitor are respectively electrically connected to the automatic control device to transmit the monitored liquid level or pressure to the automatic control device. The automatic control device controls the feeding and discharging of the sludge thickening tank according to the liquid level and controls the dewatering conditions of the sludge dewatering device according to the pressure.

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