Ammonia-nitrogen wastewater circulating treatment device

Abstract

The utility model provides an ammonia-nitrogen wastewater circulating treatment device. The ammonia-nitrogen wastewater circulating treatment device comprises an ammonia-nitrogen wastewater tank, a plurality of groups of degassing membrane modules, a liquid caustic soda dosing module, a bactericide dosing module, a sulfuric acid dosing module, an ammonium sulfate tank, a retreatment pipeline and a water producing tank, each group of degassing membrane modules is provided with a circulating tank with a circulating pipeline, the degassing membrane modules are arranged between the ammonia-nitrogen wastewater tank and the water producing tank, and the multiple groups of degassing membrane modules are sequentially arranged in series from front to back; the degassing membrane module is used for introducing ammonia-nitrogen wastewater, the circulating tank is used for storing a sulfuric acid solution, and the sulfuric acid solution in the circulating tank and the ammonia-nitrogen wastewater introduced into the degassing membrane module circularly flow through the circulating pipeline. The high-concentration ammonia-nitrogen wastewater in the degassing membrane group is matched with a low-concentration sulfuric acid solution, and the low-concentration ammonia-nitrogen wastewater is matched with a high-concentration sulfuric acid solution; meanwhile, a bactericide is added into the raw ammonia-nitrogen wastewater, so that the risk of organic sewage blockage of a degassing membrane is reduced, the treatment efficiency is improved, the treatment capacity is increased, and the treatment cost is reduced.

Description

Technical Field

[0001] The utility model relates to a wastewater circulation treatment device, in particular to an ammonia nitrogen wastewater circulation treatment device which combines multiple groups of degassing membrane modules and sulfuric acid solution training flow between circulation tanks to make high-concentration ammonia nitrogen wastewater react with low-concentration sulfuric acid solution, and low-concentration ammonia nitrogen wastewater react with high-concentration sulfuric acid solution, and adds bactericide into the wastewater to avoid organic fouling of degassing membrane filaments, thereby improving wastewater treatment efficiency and reducing the amount of medicines used. Background Art

[0002] Ammonia nitrogen is one of the main causes of poor water quality. Most of the ammonia nitrogen in industrial wastewater comes from organic matter or nitrogen-containing chemicals. Excessive nitrogen compounds entering the water body may cause algae to multiply in large numbers, causing eutrophication of rivers and lakes, and may also cause environmental problems such as dominance of specific species, acidification of rainwater, and groundwater pollution. Therefore, ammonia nitrogen in wastewater is a relatively important water quality item in the sewage treatment process.

[0003] Generally, the treatment method for high-concentration ammonia nitrogen wastewater is to first blow it through a stripping tower, and the ammonia nitrogen-containing gas blown out enters the scrubbing tower and is absorbed by spraying sulfuric acid reagents, and then enters the biological treatment process, and is converted into nitrite nitrogen and nitrate nitrogen through aerobic nitrification reaction of nitrifying bacteria. After further anaerobic denitrification by denitrifying bacteria, nitrogen is released into the atmosphere. The technologies currently developed by the industry to remove ammonia nitrogen from water include chemical neutralization, chemical precipitation, ammonia stripping, steam stripping, selective ion exchange, breakpoint gasification and biochemical methods, all of which have problems such as large footprint and complex operation.

[0004] In view of this, after a long period of research, the shortcomings of the old system were improved and the present utility model was designed. Utility Model Content

[0005] The purpose of the utility model is to overcome at least one shortcoming of the above-mentioned prior art and to provide an ammonia nitrogen wastewater circulation treatment device, which can save the space occupied by the treatment system, improve the treatment efficiency of ammonia nitrogen wastewater, increase the ammonia nitrogen wastewater treatment volume, and save the amount of reagents used.

[0006] In order to solve the above technical problems, the utility model of the ammonia nitrogen wastewater circulation treatment device has the following main features: it includes an ammonia nitrogen wastewater tank, multiple groups of degassing membrane modules, liquid alkali dosing modules, bactericide dosing modules, sulfuric acid dosing modules, an ammonium sulfate tank, a reprocessing pipeline and a water production tank; each group of degassing membrane modules is equipped with a circulation tank with a circulation pipeline, the degassing membrane module is arranged between the ammonia nitrogen wastewater tank and the water production tank, and the multiple groups of degassing membrane modules are arranged in series from front to back; the degassing membrane module is used to introduce ammonia nitrogen wastewater, the circulation tank is used to store sulfuric acid solution, and the sulfuric acid solution in the circulation tank and the ammonia nitrogen wastewater introduced into the degassing membrane module are circulated through the circulation pipeline; The liquid alkali dosing module and the bactericide dosing module are arranged between the ammonia nitrogen wastewater tank and the multiple groups of degassing membrane modules. The sulfuric acid dosing module is respectively connected to the circulation tank of each group of degassing membrane modules. The liquid alkali dosing module is used to control the pH value of the wastewater entering the degassing membrane module. The bactericide dosing module is used to add bactericide. The sulfuric acid dosing module is used to add sulfuric acid to the circulation tank. The ammonium sulfate tank is used to store ammonium sulfate solution. The water production tank is used to store qualified water produced by the final treatment. One end of the recycling pipeline is connected to the ammonia nitrogen wastewater tank, and the other end of the recycling pipeline is located between the last group of degassing membrane modules and the water production tank.

[0007] Preferably, the last group of degassing membrane modules is connected to the water production tank through a switching pipeline, the switching pipeline is provided with an ammonia nitrogen meter and a first switching valve, the ammonia nitrogen meter is used to detect the ammonia nitrogen concentration of the final water production, the recycling pipeline is located between the ammonia nitrogen meter and the first switching valve, and the recycling pipeline is provided with a second switching valve.

[0008] Preferably, the circulation pipeline of the first group of degassing membrane modules is provided with an ammonium sulfate concentration meter for detecting the concentration of ammonium sulfate flowing back into the circulation tank, each of the circulation tanks is provided with a first pH meter, and each of the circulation pipelines is provided with a circulation pump.

[0009] Preferably, the circulation tank of the first group of degassing membrane modules is connected to the ammonium sulfate storage tank.

[0010] Preferably, each of the circulation tanks is provided with a tap water replenishment control valve for replenishing water and a sulfuric acid dosing control valve for controlling the amount of sulfuric acid solution added.

[0011] Preferably, a water inlet pump and a second pH meter are arranged between the ammonia nitrogen wastewater tank and the first group of degassing membrane modules, the water inlet pump is located between the ammonia nitrogen wastewater tank and the second pH meter, and the liquid alkali dosing module and the bactericide dosing module are located in parallel between the water inlet pump and the second pH meter. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic block diagram of a standard embodiment of the ammonia nitrogen wastewater circulation treatment device of the present utility model.

[0013] Figure 2 It is a detailed block diagram of a standard embodiment of the ammonia nitrogen wastewater circulation treatment device of the utility model.

[0014] Reference numerals:

[0015] 100 Ammonia nitrogen wastewater tank

[0016] 21, 22, 23 Degassing membrane module

[0017] 31, 32, 33 circulation slots

[0018] 400 Ammonium sulfate storage tank

[0019] 500 water tank

[0020] 600 Liquid caustic soda dosing module

[0021] 700 Biocide Dosing Module

[0022] 800 Sulfuric Acid Dosing Module

[0023] 41 Inlet pump

[0024] 42, 43, 44 Sulfuric acid circulation pump

[0025] 45 Ammonium sulfate delivery pump

[0026] 51 pH meter

[0027] 61, 62, 63, 64, 65 Dosing control valve

[0028] 66, 67, 68 tap water replenishment valve

[0029] 69, 70 Water production switching valve

[0030] 71, 72, 73 Sulfuric acid circulation pipeline

[0031] 74 Water production switching pipeline

[0032] 81 Ammonium sulfate concentration meter

[0033] 82, 83, 84 pH meter

[0034] 85 Ammonia Nitrogen Meter

[0035] 91 Overflow pipe DETAILED DESCRIPTION

[0036] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific embodiments.

[0037] The ammonia nitrogen wastewater circulation treatment device of the utility model is composed of an ammonia nitrogen wastewater tank, multiple groups of degassing membrane modules, multiple groups of circulation tanks, 3 groups of dosing modules, an ammonium sulfate tank, a reprocessing pipeline and a water production tank. The high-concentration ammonia nitrogen wastewater discharged by the industry can quickly meet the discharge standard after a series of treatments by the above system. This is one of the purposes of the new device. A large amount of ammonia nitrogen wastewater is treated in a continuous circulation mode, so that the water quality of the treated ammonia nitrogen wastewater can meet the standard and achieve a stable water treatment volume; a detection device is provided to control the dosage of the dosing so that the dosage of the liquid medicine can be optimally controlled; an integrated degassing membrane element is used to save floor space; bactericides are added to the raw water to inhibit the growth of bacteria in the water body and reduce the risk of fouling and clogging of the degassing membrane element.

[0038] The ammonia nitrogen wastewater circulation treatment device of the utility model has a standard implementation example Figure 1 As shown, it mainly includes: an ammonia nitrogen wastewater tank 100, an array of degassing membrane modules 21, 22, 23, an array of circulation tanks 31, 32, 33, an ammonium sulfate storage tank 400 and a water production tank 500; wherein, the degassing membrane modules 21, 22, 23 and the circulation tanks 31, 32, 33 are respectively connected with a circulation pipeline to form an array of degassing circulation units; at the same time, a liquid alkali dosing module 600 for controlling the pH value of the wastewater entering the degassing membrane module unit, a bactericide dosing module 700 for adding bactericide to the wastewater, and a sulfuric acid dosing module 800 for introducing sulfuric acid into the circulation tank are provided. Among them, the degassing membrane modules 21, 22, and 23 are arranged between the ammonia nitrogen wastewater tank 100 and the water production tank 500, and are arranged in series from front to back; the ammonium sulfate storage tank 400 is used to store high-concentration ammonium sulfate solution, and the water production tank 500 stores qualified processed water. The system water can be further recycled and reused or discharged to the factory's discharge port for qualified discharge.

[0039] The ammonia nitrogen wastewater circulation treatment device of this utility model, its detailed composition please refer to Figure 2As shown, a pipeline 1a is provided between the ammonia nitrogen wastewater tank 100 and the degassing membrane module 21, and a water inlet pump 41 and a pH meter 51 are provided on the pipeline 1a. The pipeline between the water inlet pump 41 and the acid-base analyzer 51 is connected to the pipeline 1b to the liquid alkali dosing module 600, and a dosing control valve 61 is provided on the pipeline 1b; the water inlet pump 41 is mainly used to pump the ammonia nitrogen wastewater stored in the ammonia nitrogen wastewater tank 100 into the pipeline 1a; the acid-base analyzer 51 is mainly used to detect the pH value (pH) of the ammonia nitrogen wastewater in the pipeline 1a. If the pH value (pH) of the ammonia nitrogen wastewater introduced from the ammonia nitrogen wastewater tank 100 is not within the range of 10.5 to 11, the liquid alkali dosing module 600 is started, liquid alkali is added for adjustment, and the dosing control valve 61 is driven to control the dosing amount to keep the pH value of the ammonia nitrogen wastewater entering the degassing membrane module 21 within the range of 10.5 to 11.

[0040] as Figure 2 As shown, the pipeline 1c is connected to the bactericide dosing module 700 on the pipeline between the water inlet pump 41 and the acid-base analyzer 51, and a dosing control valve 62 is provided on the pipeline 1c; the dosing control valve 62 is opened at a fixed time according to the running time of the water inlet pump 41 to add bactericide to sterilize the degassing membrane to prevent bacteria from growing and causing the degassing membrane to be contaminated.

[0041] like Figure 2 As shown, a group of circulating pipelines 71 for circulating flow are provided between the first group of degassing membrane modules 21 and the circulating tank 31. A circulating pump 42 is provided on the circulating pipeline 71 to pump the sulfuric acid solution stored in the circulating tank 31 into the degassing membrane module 21. The sulfuric acid solution absorbs ammonia volatilized from the ammonia nitrogen wastewater in the first group of degassing membrane modules 21, and forms ammonium sulfate after a reaction, and then flows back to the circulating tank 31 from the circulating pipeline 71b, thereby repeatedly circulating to reduce the ammonia nitrogen content in the degassing membrane module 21, and the ammonia nitrogen wastewater passing through the degassing membrane module 21 enters the degassing membrane module 22;

[0042] The above-mentioned circulation pipeline 71 is provided with an ammonium sulfate concentration meter 81 on the pipeline flowing back to the circulation tank 31. The ammonium sulfate concentration meter 81 can be used to detect the ammonium sulfate concentration in the first group of circulation tanks 31. When the measured ammonium sulfate concentration reaches the set upper limit value, the ammonium sulfate transfer pump 45 is turned on to transfer the ammonium sulfate with excessively high concentration in the circulation tank 31 to the ammonium sulfate storage tank 400 until the ammonium sulfate concentration in the circulation tank 31 returns to the set normal value, and the ammonium sulfate transfer pump 45 stops working.

[0043] like Figure 2As shown, a pH meter 82, a sulfuric acid dosing control valve 65, and a tap water replenishment valve 68 are provided on the circulation tank 31. The pH meter 82 is mainly used to detect whether the pH value in the circulation tank 31 is between 0.8 and 2. If the pH value is not between 0.8 and 2, the dosing control valve 65 controls the sulfuric acid dosing module 800 to add the drug in time, or controls the tap water replenishment valve 68 to dilute, and adjusts the pH value inside the circulation tank 31 to between 0.8 and 2.

[0044] As shown in FIG. 2 , the first group of degassing membrane modules 21 is followed by the second and third groups of degassing membrane modules 22 and 23 for receiving the ammonia nitrogen wastewater treated by the previous group of degassing membrane modules; circulation pipelines 72 and 73 for circulating sulfuric acid solution are also provided between the degassing membrane module 22 and the circulation tank 32, and between the degassing membrane module 23 and the circulation tank 33, so that the ammonia content in the ammonia nitrogen wastewater is gradually reduced through multiple circulation treatments; a switching pipeline 74 is provided at the outlet of the degassing membrane group 23, and an ammonia nitrogen meter 85 and a group of switching valves 69 and 70 are provided on the switching pipeline 74. The ammonia nitrogen meter 85 is mainly used to detect the ammonia nitrogen concentration of the final produced water. When the concentration is higher than the set value, the switching valve 70 is opened, and the switching valve 69 is closed, so that the produced water returns to the ammonia nitrogen wastewater tank for further treatment. When the concentration is lower than the set value, the switching valve 69 is opened, and the switching valve 70 is closed, so that the final treated produced water flowing to the water production tank 500 can be recycled or discharged to the discharge port of the factory.

[0045] As mentioned above, no ammonium sulfate concentration meter is set on the circulation pipelines 72 and 73 of the second and third groups of degassing membrane modules 22 and 23, and pH meters 83 and 84 are respectively set on the second and third groups of circulation tanks 32 and 33 to detect whether the pH value of the sulfuric acid concentration in the second and third groups of circulation tanks 32 and 33 is between 0.8 and 2. If the pH value is not between 0.8 and 2, the sulfuric acid dosing module 800 is controlled to introduce sulfuric acid solution through a dosing control valve 63 and 64, or tap water is added through a tap water replenishment valve 66 and 67 until the pH value of the sulfuric acid concentration in the second and third groups of circulation tanks 32 and 33 reaches between 0.8 and 2.

[0046] Therefore, the treatment process of the new type of ammonia nitrogen wastewater circulation treatment device during implementation is: the ammonia nitrogen wastewater is treated by the first group of degassing membrane modules 21, then enters the second group of degassing membrane modules 22 for treatment, and then enters the third group of degassing membrane modules 23 for treatment, and finally the treated water enters the water production tank 500. The water in the water production tank 500 can be recycled and reused or discharged to the factory discharge port.

[0047] The ammonia nitrogen wastewater concentration in the first group of degassing membrane modules 21 is the highest, followed by the second group of degassing membrane modules 22, and finally the third group of degassing membrane modules 23;

[0048] Before the ammonia nitrogen wastewater enters each degassing membrane module 21, 22, 23, each group of circulation tanks 31, 32, 33 first adjusts the concentration of the sulfuric acid solution; when adjusting, first open the tap water replenishment control valves 66, 67, 68, and calculate the replenishment amount according to the size of the circulation tanks 31, 32, 33. After replenishing the tap water, close the tap water replenishment valves 66, 67, 68, and then open the sulfuric acid dosing control valves 63, 64, 65 to add sulfuric acid solution from the sulfuric acid dosing module 800;

[0049] When the liquid level of each group of circulation tanks 31, 32, 33 reaches the circulation condition, the circulation starts;

[0050] The circulation of the third group of circulation tanks 33 is as follows: the circulation pump 44 is started, and the sulfuric acid solution enters the degassing membrane module 23 through the circulation pipeline 73, and then flows back to the third group of circulation tanks 33 to form an internal circulation. At the same time, the pH meter 84 detects the pH value of the sulfuric acid solution in the third group of circulation tanks 33, and controls the pH value to be between about 0.8 and 2. When the control condition is reached, the sulfuric acid dosing module 800 and the dosing control valve 63 automatically stop the action;

[0051] The circulation of the second group of circulation tanks 32 is as follows: the circulation pump 43 is started, the sulfuric acid solution enters the degassing membrane module 22 through the circulation pipeline 72, and then flows back to the second group of circulation tanks 32 to form an internal circulation. At the same time, the pH meter 83 detects the pH value of the sulfuric acid solution in the second group of circulation tanks 32, and controls the pH value to be between about 0.8 and 2. When the control condition is reached, the sulfuric acid dosing module 800 and the sulfuric acid dosing control valve 64 automatically stop the action;

[0052] The sulfuric acid solution in the first group of circulation tanks 31 first overflows from the overflow pipe 91 of the third group of circulation tanks 33 to the second group of circulation tanks 32, and then overflows from the overflow pipe 91 of the second group of circulation tanks 32 to the first group of circulation tanks 31. After the liquid level of the first group of circulation tanks 31 reaches the circulation condition, the circulation begins.

[0053] The first group of degassing membrane modules 21 starts the circulation pump 42, and the sulfuric acid solution is introduced into the first group of degassing membrane modules 21 through the circulation pipeline 71, and then flows back to the first group of circulation tanks 31 to form an internal cycle. The ammonium sulfate concentration meter 81 is used to control the ammonium sulfate concentration in the circulation tank 31; when the ammonium sulfate concentration meter 81 detects that the ammonium sulfate concentration is the set upper limit of the concentration, the ammonium sulfate transfer pump 45 is turned on to pump the ammonium sulfate from the pipeline to the ammonium sulfate storage tank 400. When the ammonium sulfate concentration meter 81 detects that the set ammonium sulfate concentration is normal, the ammonium sulfate transfer pump 41 stops pumping into the ammonium sulfate storage tank 400;

[0054] Therefore, the concentration of sulfuric acid contained in the first, second and third groups of circulation tanks 31, 32 and 33 is the highest in the third group of circulation tanks 33, followed by the second group of circulation tanks 32, and finally the first group of circulation tanks 31; and the concentration of sulfuric acid contained in the three groups of circulation tanks 31, 32 and 33 is opposite to the concentration of ammonia nitrogen wastewater of the degassing membrane modules 21, 22 and 23;

[0055] The high-concentration sulfuric acid solution in the third group of circulation tanks 33 corresponds to the low-concentration ammonia nitrogen wastewater in the third group of degassing membrane modules 23, the medium-concentration sulfuric acid solution in the second group of circulation tanks 32 corresponds to the medium-concentration ammonia nitrogen wastewater in the second group of degassing membrane modules 22, and finally the low-concentration sulfuric acid solution in the first group of circulation tanks 31 corresponds to the high-concentration ammonia nitrogen wastewater in the first group of degassing membrane modules 21. This can fully utilize the sulfuric acid agent, reduce the amount of agent used, and achieve better effluent water quality.

[0056] The novel ammonia nitrogen wastewater circulation treatment device uses the fact that high-concentration ammonia nitrogen wastewater easily reacts with sulfuric acid solution to form ammonium sulfate solution, and low-concentration ammonia nitrogen wastewater easily reacts with high-concentration sulfuric acid solution to form ammonium sulfate solution, thereby accelerating the overall circulation treatment speed. Therefore, when the first group of degassing membrane modules 21 is high-concentration ammonia nitrogen wastewater, the low-concentration sulfuric acid solution in the circulation tank 31 is used for treatment; conversely, when the third group of degassing membrane modules 23 is low-concentration ammonia nitrogen wastewater, it reacts with high-concentration sulfuric acid solution to form ammonium sulfate solution.

[0057] Before the system starts circulating, the sulfuric acid concentrations in the three circulation tanks 31, 32, and 33 should be the same. After the ammonia nitrogen wastewater passes through the degassing membrane modules 21, 22, and 23 one by one, the sulfuric acid concentrations in the circulation tanks 31, 32, and 33 will gradually form the above-mentioned concentration state due to the different amounts of ammonia nitrogen absorbed.

[0058] It can be seen from the above implementation description that the utility model has the following advantages:

[0059] By connecting multiple groups of degassing membrane modules in series, the water quality can be better ensured. When the ammonia nitrogen wastewater reaches the third group of degassing membrane modules, the ammonia nitrogen content in the wastewater has been greatly reduced to meet the discharge standards.

[0060] Because it can effectively control the addition of medicine, it will not only reduce the amount of liquid medicine used, but also have a more stable water quality, meeting the discharge standards and the amount of recycled water.

[0061] The anti-fouling and anti-clogging function of the degassing membrane is taken into consideration, thereby greatly reducing the time and cost of cleaning the degassing membrane.

[0062] It can greatly improve the removal efficiency of ammonia nitrogen wastewater.

[0063] In summary, the ammonia nitrogen wastewater recycling treatment device of the present utility model has been described with reference to its specific embodiments, and can achieve the expected use effect, but it is obvious that various modifications and changes can still be made without departing from the spirit and scope of the utility model. Therefore, the description and covering should be regarded as illustrative rather than restrictive.

Claims

1. An ammonia nitrogen wastewater circulation treatment device, characterized in that: The invention comprises an ammonia nitrogen wastewater tank, multiple groups of degassing membrane modules, liquid alkali dosing modules, bactericide dosing modules, sulfuric acid dosing modules, an ammonium sulfate tank, a recycling pipeline and a water production tank; each group of degassing membrane modules is equipped with a circulation tank with a recycling pipeline, the degassing membrane module is arranged between the ammonia nitrogen wastewater tank and the water production tank, and the multiple groups of degassing membrane modules are arranged in series from front to back; the degassing membrane module is used to introduce ammonia nitrogen wastewater, the circulation tank is used to store sulfuric acid solution, and the circulation pipeline allows the sulfuric acid solution in the circulation tank and the ammonia nitrogen wastewater introduced into the degassing membrane module to circulate; the liquid alkali dosing module and the bactericide dosing module The group is arranged between the ammonia nitrogen wastewater tank and the multiple groups of degassing membrane modules, the sulfuric acid dosing module is respectively connected to the circulation tank of each group of degassing membrane modules, the liquid alkali dosing module is used to control the pH value of the wastewater entering the degassing membrane module, the bactericide dosing module is used to add bactericide, the sulfuric acid dosing module is used to add sulfuric acid to the circulation tank, the ammonium sulfate tank is used to store ammonium sulfate solution, the water production tank is used to store qualified water produced by the final treatment, one end of the recycling pipeline is connected to the ammonia nitrogen wastewater tank, and the other end of the recycling pipeline is located between the last group of degassing membrane modules and the water production tank.

2. The ammonia nitrogen wastewater circulation treatment device according to claim 1 is characterized in that: The last group of degassing membrane modules is connected to the water production tank through a switching pipeline. The switching pipeline is provided with an ammonia nitrogen meter and a first switching valve. The ammonia nitrogen meter is used to detect the ammonia nitrogen concentration of the final produced water. The recycling pipeline is located between the ammonia nitrogen meter and the first switching valve. The recycling pipeline is provided with a second switching valve.

3. The ammonia nitrogen wastewater circulation treatment device according to claim 1 is characterized in that: The circulation pipeline of the first group of degassing membrane modules is provided with an ammonium sulfate concentration meter for detecting the concentration of ammonium sulfate flowing back to the circulation tank, each of the circulation tanks is provided with a first pH meter, and each of the circulation pipelines is provided with a circulation pump.

4. The ammonia nitrogen wastewater circulation treatment device according to claim 3 is characterized in that: The circulation tank of the first group of degassing membrane modules is connected to the ammonium sulfate storage tank.

5. The ammonia nitrogen wastewater circulation treatment device according to claim 1 is characterized in that: Each of the circulation tanks is provided with a tap water replenishment control valve for replenishing water and a sulfuric acid dosing control valve for controlling the amount of sulfuric acid solution added.

6. The ammonia nitrogen wastewater circulation treatment device according to claim 1 is characterized in that: A water inlet pump and a second pH meter are arranged between the ammonia nitrogen wastewater tank and the first group of degassing membrane modules. The water inlet pump is located between the ammonia nitrogen wastewater tank and the second pH meter. The liquid alkali dosing module and the bactericide dosing module are located in parallel between the water inlet pump and the second pH meter.

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