Modularized treatment device for ammonia-nitrogen wastewater

Abstract

The invention discloses a modular treatment device for ammonia-nitrogen wastewater, and relates to the field of ammonia-nitrogen wastewater treatment.The modular treatment device comprises a device body, an absorption tower, an aeration system and a dosing system.The device body is internally provided with a denitrification main machine, the side edge of the denitrification main machine is provided with an overflow weir, and the top of the absorption tower is provided with a circulating pipe; the outer wall of the circulating pipe is in flange connection with a circulating pump, the other end of the circulating pipe is provided with a dilute sulphuric acid storage box, the top of the denitrification host is provided with a gas-collecting hood, and the aeration system comprises a heating resistor, an aeration pipe, a temperature control probe and an inorganic ceramic microporous aeration pipe. The modular treatment device for the ammonia-nitrogen wastewater can be used for the field of high-concentration ammonia-nitrogen wastewater treatment, such as livestock and poultry breeding wastewater, rare earth smelting wastewater, coke smelting wastewater and chemical wastewater, low-cost and high-efficiency ammonia-nitrogen removal work can be performed, secondary pollution can be avoided, and resource utilization can be performed.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of ammonia-nitrogen wastewater treatment, and particularly relates to a modular treatment device for ammonia-nitrogen wastewater. BACKGROUND

[0002] At present, the harm of high-concentration ammonia-nitrogen wastewater such as livestock and poultry breeding wastewater, rare earth smelting wastewater, coke smelting wastewater, and chemical wastewater to water bodies has become an environmental problem of worldwide concern. Most of the ammonia-nitrogen-containing wastewater is directly discharged into water bodies without any treatment or substandard treatment, leading to water pollution and eutrophication, and further affecting the soil, air, and the like. Common nitrogen-containing compounds mainly include organic nitrogen, ammonia-nitrogen, nitrite-nitrogen, and nitrate-nitrogen.

[0003] Among them, ammonia-nitrogen is the main pollutant causing water eutrophication, and its emission control has become the focus and difficulty in the field of water treatment. For high-concentration ammonia-nitrogen wastewater, mainly: 1. Chemical precipitation method, also known as MAP precipitation method, is to add magnesium compounds and phosphoric acid or hydrogen phosphate to wastewater containing ammonia-nitrogen, so that NH4+ in wastewater reacts with Mg2+ and PO43- in the aqueous solution to generate magnesium ammonium phosphate precipitate, thereby achieving the purpose of removing ammonia-nitrogen. Phosphoric acid is commonly known as struvite, which can be used as a fertilizer additive for compost, soil, or a fire retardant for building structural products. Due to the limitation of the solubility product of iron magnesium phosphate, when the ammonia-nitrogen in wastewater reaches a certain concentration, the removal effect is not obvious after adding the dosage, and the cost is greatly increased. At the same time, a large amount of reagent is used, a large amount of sludge is generated, and the treatment cost is relatively high. The chlorine ions and residual phosphorus introduced during the addition of the reagent can easily cause secondary pollution.

[0004] 2. Ordinary stripping method, the ammonia-nitrogen removal by stripping is to adjust the pH value to alkaline, so that the ammonia ion in the wastewater is converted into ammonia, and the ammonia mainly exists in the form of free ammonia. Then, the free ammonia is carried out of the wastewater by the carrier gas, so as to achieve the purpose of removing ammonia-nitrogen. The factors affecting the stripping efficiency mainly include pH value, temperature, gas-liquid ratio, gas flow rate, initial concentration, and the like. At present, the stripping method is widely used in the treatment of high-concentration ammonia-nitrogen wastewater. The stripping method has good ammonia-nitrogen removal effect, simple operation, and easy control, but the ammonia-nitrogen removal efficiency is low at low temperature, and the gas formed by stripping causes secondary pollution.

[0005] 3. Breakpoint chlorination method, the mechanism of ammonia removal is that chlorine reacts with ammonia to generate harmless nitrogen. The liquid chlorine used in the breakpoint chlorination method has high safety requirements for use and storage, and the treatment cost is high. In addition, the by-products chloroamine and chlorinated organic matter can cause secondary pollution, and therefore the method is not suitable for the treatment of high-concentration ammonia-nitrogen wastewater.

[0006] 4. Catalytic oxidation method, through the action of catalyst, under certain temperature and pressure, organic matter and ammonia in wastewater can be oxidized and decomposed into CO2, N2 and H2O harmless substances respectively by air oxidation, to achieve the purpose of purification. The application difficulty lies in how to prevent the loss of catalyst and the corrosion protection of equipment.

[0007] 5. Electrochemical oxidation method, which uses a catalytically active electrode to oxidize and remove pollutants in water. Influencing factors include current density, water flow, water placement time and point solution time, etc. Its removal rate is high, but there are safety hazards, electrode scaling, complex operation and management problems.

[0008] 6. Traditional biological method, under the action of various microorganisms, through a series of reactions such as nitrification and denitrification, ammonia nitrogen in wastewater is converted into nitrogen, so as to achieve the purpose of wastewater treatment. Traditional biological method needs to go through two stages to remove ammonia nitrogen, the first stage is nitrification process, under aerobic conditions, nitrifying bacteria convert ammonia into nitrite and nitrate; the second stage is denitrification process, under anaerobic or low oxygen conditions, denitrifying bacteria convert nitrate and nitrite in wastewater into nitrogen. This method has the advantages of stable effect, simple operation, no secondary pollution, low cost and the like. This method also has some disadvantages, such as when the C / N ratio in wastewater is low, carbon source must be supplemented, the temperature requirement is relatively strict, the efficiency is low at low temperature, the occupied area is large, the oxygen demand is large, some harmful substances such as heavy metal ions have a suppressing effect on microorganisms, and the biological method needs to be removed before being carried out, in addition, the ammonia nitrogen concentration in wastewater is too high to have an inhibitory effect on the nitrification process, so the ammonia nitrogen concentration in wastewater should be less than 300 mg / L before treating high-concentration ammonia nitrogen wastewater. The traditional biological method is suitable for treating low-concentration ammonia nitrogen wastewater containing organic matter.

[0009] Therefore, it is necessary to provide a modular treatment device for ammonia nitrogen wastewater to solve the above problems. SUMMARY

[0010] The main purpose of the present application is to provide a modular treatment device for ammonia nitrogen wastewater, which can effectively solve the problems in the background art.

[0011] To achieve the above purpose, the technical scheme adopted by the present application is: A modular treatment device for ammonia nitrogen wastewater, comprising a device body, an absorption tower, an aeration system and a dosing system, a denitrification host is installed in the inner cavity of the device body, an aeration groove is formed in the inner cavity of the denitrification host, and an overflow weir is installed on the side of the denitrification host; A circulating pipe is installed on the top of the absorption tower, a circulating pump is connected to the flange of the outer wall of the circulating pipe, a dilute sulfuric acid storage tank is installed at the other end of the circulating pipe, and a gas collecting hood is arranged on the top of the denitrification host; The aeration system comprises a heating resistor, an aeration pipe, a temperature control probe and an inorganic ceramic microporous aeration pipe.

[0012] Preferably, the number of denitrification hosts is at least four, the denitrification hosts are connected in series in the inner cavity of the device body, the overflow weirs at the top and bottom of the denitrification hosts are in opposite positions, a water inlet is installed on the top of the outer wall of the device body, the water inlet is used for inputting ammonia-nitrogen wastewater into the inner cavity of the top denitrification host, and the ammonia-nitrogen wastewater of each denitrification host flows through the overflow weirs.

[0013] Preferably, a water distribution plate is installed on the top of the inner cavity of the aeration tank, a pH probe is installed on the water distribution plate, and the inorganic ceramic microporous aeration pipe is located at the bottom of the inner cavity of the aeration tank.

[0014] Preferably, an exhaust pipe is installed on the side of the absorption tower, the exhaust pipe is connected with a gas collecting hood, the gas collecting hood is installed in the inner cavity of the device body, a dilute sulfuric acid storage tank is connected with the absorption tower through a pipeline, and the number of the gas collecting hoods is consistent with that of the denitrification hosts.

[0015] Preferably, the aeration system is an aeration fan, the aeration system is connected with the heating resistor, the aeration pipe is connected with the heating resistor, the aeration pipe is connected with the inorganic ceramic microporous aeration pipe, the temperature control probe is installed on the aeration pipe, the temperature control probe is used for monitoring the temperature in the aeration pipe, and the number of the inorganic ceramic microporous aeration pipes is consistent with that of the denitrification hosts.

[0016] Preferably, the dosing system is a dosing pipeline, the dosing pipeline is connected with a medicine tank through a liquid delivery pump, the number of the dosing pipelines is consistent with that of the denitrification hosts, the other end of the dosing pipeline penetrates through the outer wall of the device body and extends into the inner cavity of the device body, and the dosing pipeline is used for injecting lye into the inner cavity of the denitrification host.

[0017] Preferably, a drain pipe is installed on the bottom of the side of the device body, the drain pipe is located on the side of the bottommost overflow weir, and the aeration amount of each inorganic ceramic microporous aeration pipe is adjusted through an adjusting valve installed on the aeration pipe.

[0018] Preferably, the gas collecting hood and the exhaust pipe are used for inputting ammonia-nitrogen waste gas in wastewater into the inner cavity of the absorption tower, and the absorption tower is a reverse spray type.

[0019] Preferably, the electric adjusting valve and the electromagnetic flowmeter are flange-connected to the water inlet and the dosing system.

[0020] Compared with the prior art, the present application provides a modular treatment device for ammonia-nitrogen wastewater, which has the following beneficial effects: The modular treatment device for ammonia-nitrogen wastewater adopts a vertical multi-stage series shallow micro-porous aeration process, converts ammonia ions in the wastewater into ammonia under an alkaline condition, makes the ammonia mainly exist in the form of free ammonia, carries the free ammonia out of the wastewater by a carrier gas, and thus the purpose of removing ammonia-nitrogen is achieved. Different from the traditional stripping method, under the condition of shallow aeration, the free ammonia can quickly escape from the water body, and meanwhile, a high gas-liquid ratio is not needed, thereby reducing the treatment cost; the aeration system of the device adopts hot air as the carrier gas, thereby ensuring high treatment efficiency under low temperature conditions; by adopting the multi-stage modular series connection of the denitrification main machine, different concentrations and requirements can be combined, and the application is flexible; by setting the medicine box and the water inlet, the medicine cost can be reduced, and the treatment efficiency is improved; the tail gas is used as a resource, and secondary pollution is also avoided.

[0021] The modular treatment device for ammonia-nitrogen wastewater can be used for the field of high-concentration ammonia-nitrogen wastewater treatment, such as livestock and poultry breeding wastewater, rare earth smelting wastewater, coke smelting wastewater, chemical wastewater and the like, can perform low-cost and high-efficiency ammonia-nitrogen removal work, and meanwhile, secondary pollution can be avoided, and resource utilization is performed.

[0022] The modular treatment device for ammonia-nitrogen wastewater has the following advantages: The shallow aeration reduces the gas-liquid ratio, improves the treatment efficiency; the modular design and manufacturing, multi-stage series connection, flexible application; the hot air as the carrier gas has good application and treatment effect under low temperature conditions; precise dosing, reduces the medicine consumption, and reduces the operation cost; the separate air duct adjusts according to the concentration and the standard requirement, and reduces the energy consumption; the tail gas is used as a resource, and there is no secondary pollution; the automation control has low labor intensity of manual operation; the vertical tower structure occupies less land area. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is the structural schematic diagram of the whole of the present application; Figure 2 is the sectional view of the device body of the present application; Figure 3 is the structural schematic diagram of the absorption tower of the present application; Figure 4 is the structural schematic diagram of the aeration system of the present application; Figure 5 is the structural schematic diagram of the denitrification main machine of the present application.

[0024] In the drawing: 1, device body; 2, water inlet; 3, dosing system; 4, medicine box; 5, absorption tower; 6, exhaust pipe; 7, gas collection cover; 8, dilute sulfuric acid storage box; 9, circulating pump; 10, circulating pipe; 11, aeration system; 12, heating resistor; 13, aeration pipe; 14, temperature control probe; 15, inorganic ceramic micro-porous aeration pipe; 16, denitrification main machine; 17, aeration tank; 18, overflow weir; 19, water distribution plate; 20, pH probe. Detailed Implementation

[0025] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0026] Example 1: like Figures 1-5 As shown, a modular treatment device for ammonia nitrogen wastewater includes a device body 1, an absorption tower 5, an aeration system 11, and a dosing system 3. A denitrification unit 16 is installed inside the cavity of the device body 1. An aeration tank 17 is formed inside the cavity of the denitrification unit 16. An overflow weir 18 is installed on the side of the denitrification unit 16. There are at least four denitrification units 16 connected in series inside the cavity of the device body 1. The overflow weirs 18 at the top and bottom denitrification units 16 are in opposite positions. An inlet 2 is installed at the top of the outer wall of the device body 1. The inlet 2 is used to input ammonia nitrogen wastewater into the cavity of the top denitrification unit 16. Each denitrification unit... The nitrogen generator 16 circulates ammonia nitrogen wastewater through the overflow weir 18. A water distribution plate 19 is installed at the top of the aeration tank 17, and a pH probe 20 is installed at the water distribution plate 19. The inorganic ceramic microporous aeration pipe 15 is located at the bottom of the aeration tank 17. The dosing system 3 is a dosing pipeline. The dosing pipeline is connected to the medicine tank 4 through the infusion pump. The number of dosing pipelines is the same as that of the nitrogen generator 16. The other end of the dosing pipeline passes through the outer wall of the device body 1 and extends into the inner cavity of the device body 1. The dosing pipeline is used to inject alkaline solution into the inner cavity of the nitrogen generator 16. Electric regulating valves and electromagnetic flow meters are flanged at the inlet 2 and the dosing system 3.

[0027] Example 2: like Figures 1-5 As shown, a modular treatment device for ammonia nitrogen wastewater is provided. A circulation pipe 10 is installed at the top of the absorption tower 5, and a circulation pump 9 is connected to the outer flange of the circulation pipe 10. A dilute sulfuric acid storage tank 8 is installed at the other end of the circulation pipe 10. A gas collection hood 7 is installed at the top of the denitrification main unit 16. An exhaust pipe 6 is installed on the side of the absorption tower 5 and is connected to the gas collection hood 7. The gas collection hood 7 is installed inside the device body 1. The dilute sulfuric acid storage tank 8 is connected to the absorption tower 5 via a pipe. The number of gas collection hoods 7 is the same as the number of denitrification main units 16. A drain pipe is installed at the bottom of the side of the device body 1, located on the side of the bottom overflow weir 18. Each inorganic ceramic microporous aeration pipe 15 has its aeration rate adjusted by a regulating valve installed at the aeration pipe 13. The gas collection hood 7 and the exhaust pipe 6 are used to input ammonia nitrogen waste gas from the wastewater into the inner cavity of the absorption tower 5. The absorption tower 5 is a counter-current spray type.

[0028] Example 3: like Figures 1-5As shown, a modular treatment device for ammonia-nitrogen wastewater, the aeration system 11 includes a heating resistor 12, an aeration pipe 13, a temperature control probe 14 and an inorganic ceramic microporous aeration pipe 15, the aeration system 11 is an aeration fan, the aeration system 11 is connected with the heating resistor 12, the aeration pipe 13 is connected with the heating resistor 12, the aeration pipe 13 is connected with the inorganic ceramic microporous aeration pipe 15, the temperature control probe 14 is installed at the aeration pipe 13, the temperature control probe 14 is used for monitoring the temperature in the aeration pipe 13, the number of the inorganic ceramic microporous aeration pipe 15 is consistent with the denitrification host 16.

[0029] The vertical multi-stage series shallow microporous aeration process is adopted, the ammonia ion in the wastewater is converted to ammonia under alkaline conditions, so that the ammonia mainly exists in the form of free ammonia, and then the free ammonia is carried out of the wastewater by the carrier gas, so that the purpose of removing ammonia-nitrogen is achieved. Different from the traditional stripping method, under the condition of shallow aeration, free ammonia can quickly escape from the water body, and at the same time, a high gas-liquid ratio is not required, thereby reducing the treatment cost; the aeration system 11 of the device adopts hot air as the carrier gas, which ensures high treatment efficiency under low temperature conditions; by adopting the multi-stage modular series connection of the denitrification host 16, different concentrations and requirements can be combined, and the application is flexible; by setting the medicine box 4 and the water inlet 2, the reagent cost can be reduced, and the treatment efficiency can be improved; the tail gas is resourceized, and secondary pollution is also avoided. It can be used for low-cost and high-efficiency ammonia-nitrogen removal in the field of high-concentration ammonia-nitrogen wastewater treatment, such as livestock and poultry breeding wastewater, rare earth smelting wastewater, coke smelting wastewater, chemical wastewater, etc., and can avoid secondary pollution and resource utilization.

[0030] The modular treatment device for ammonia-nitrogen wastewater has the following advantages: Shallow aeration, low gas-liquid ratio, high treatment efficiency; modular design and manufacturing, multi-stage series connection, flexible application; hot air as carrier gas, good application and treatment effect under low temperature conditions; precise dosing, reducing reagent consumption and reducing operating cost; separate airway, adjusting according to concentration and standard requirement, reducing energy consumption; tail gas resource utilization, no secondary pollution; automatic control, low labor intensity of manual operation; vertical tower structure, small land occupation.

[0031] Example four: A kind of modular treatment device for ammonia nitrogen wastewater, denitrification host 16 adopts vertical multistage shallow layer micro-porous aeration process in series;Using the principle that ammonium ion is converted into free ammonia under alkaline state, separate from water body after hot air stripping, achieve denitrification effect. Each level of denitrification host 16 is provided with inorganic ceramic micro-porous aeration pipe 15, inorganic ceramic micro-porous aeration pipe 15 is installed at the bottom of the inner cavity of denitrification host 16;The upper portion of inorganic ceramic micro-porous aeration pipe 15 is water distribution plate 19;The upper portion of water distribution plate 19 is gas collection hood 7;Each level of denitrification host 16 is connected by overflow weir 18;The gas of gas collection hood 7 is collected into absorption tower 5 through exhaust pipe 6, absorption tower 5 uses dilute sulfuric acid storage tank 8 and circulating pump 9 to carry out reverse spray circulation, and recycles ammonium sulfate. Each level of denitrification host 16 is provided with pH probe 20, and control combined dosing system 3 to add reagent, to ensure that the pH of each layer in denitrification host 16 meets the process requirements;Aeration system 11 controls heating resistance 12 heating through temperature control probe 14, to ensure the temperature of air entering denitrification host 16, to achieve maximum ammonia removal efficiency. The device body 1 is modular, standardized in design and manufacture, and can be assembled according to different concentrations and standard requirements. The denitrification host 16 in the device is vertical and in series, so the structure is compact, the land area is small, and the cost of construction is low. The modular design makes the device easy to assemble, flexible to use and suitable for different application scenarios. The inorganic ceramic micro-porous aeration pipe 15 has anti-pollution and anti-aging properties, greatly improving the service life. Precise dosing and temperature control are achieved by using pH and temperature control, reducing reagent consumption and subsequent pH adjustment, reducing power consumption and operating costs. Recycling and resource utilization of waste water meet the resource utilization and sustainable development concept.

[0032] Example four: The device is a modular device for high-concentration ammonia nitrogen wastewater treatment and resource utilization, including device body 1, denitrification host 16, aeration system 11, absorption tower 5, dosing system 3, circulating pipe 10, temperature control system, inlet and outlet water system, water distribution system, overflow weir 18, electrical control, etc. The device body 1 adopts multistage vertical denitrification host 16 in series. Each level is modular in design and manufacture. Each single denitrification host 16 is divided into an aeration zone, a water distribution zone and a gas collection chamber from bottom to top, which are inorganic ceramic micro-porous aeration pipe 15, water distribution plate 19 and gas collection hood 7 respectively. The aeration zone is an aeration tank 17, which is provided with an inorganic ceramic micro-porous aeration pipe 15 at the bottom of the inner cavity of the aeration tank 17 of the single denitrification host 16. Each level of denitrification host 16 is connected by overflow weir 18. Each level of denitrification host 16 is provided with pH probe 20 and dosing system 3 for precise dosing of reagents. Heating resistance 12 and temperature control probe 14 are provided at aeration pipe 13 for precise temperature control. Electromagnetic flow meter and electric regulating valve are arranged at the dosing system 3 and the water inlet 2 for automatically adjusting the flow The water inlet mode of the device body 1 is up inlet and down outlet. The dosing system 3 is a staged air inlet, and the aeration amount of each stage is distributed according to the ammonia nitrogen concentration. Each stage of the denitrification host 16 is provided with a dosing system 3 and an exhaust pipe 6. The ammonia nitrogen gas separated at the denitrification host 16 is collected by the exhaust pipe 6 and then enters the absorption tower 5. The absorption tower 5 is a reverse spray circulation absorption.

[0033] When the device body 1 works, the ammonia nitrogen wastewater enters from the water inlet 2, uniformly flows into the aeration tank 17 through the water distribution plate 19, and the lye in the inner cavity of the chemical tank 4 adjusts the wastewater to the set pH under the control of the pH probe 20. At this time, the ammonium ion in the wastewater is converted into free ammonia, the high-temperature air in the aeration tank 17 separates the free ammonia in the wastewater and enters the gas hood 7, the ammonia nitrogen gas in the gas hood 7 enters the absorption tower 5 through the exhaust pipe 6, and the dilute sulfuric acid in the inner cavity of the dilute sulfuric acid storage tank 8 is used for circulation absorption, so as to achieve the purpose of resource utilization. Each stage is a complete ammonia removal module, and multiple modules are connected in series to form an ammonia removal host. According to different concentrations and standard requirements, the number of modules is selected.

[0034] The device body 1 is a tower structure, and the modular design and production of the denitrification host 16 are adopted, and the socket type connection and sealing or flange type connection and sealing are adopted between different denitrification hosts 16.

[0035] The material of the device body 1 is carbon steel, stainless steel, PP, PVC, HDPE, etc.

[0036] After the treatment of the device, the ammonia nitrogen in the wastewater is finally formed into ammonium sulfate solution or crystal for recycling.

[0037] Shallow stripping is adopted, and the wastewater height in each denitrification host 16 does not exceed 0.8 m.

[0038] High-temperature air stripping is adopted, the temperature of the water inlet 2 exceeds 50℃, and the water temperature is adjusted. The gas-liquid ratio of each stage is 6:1~12:1, and the ammonia nitrogen concentration is adjusted. Layered dosing is adopted to control the pH, and the pH of each stage is controlled between 9-11, and the ammonia nitrogen concentration is adjusted.

[0039] It should be noted that the application is a kind of modular treatment device for ammonia nitrogen wastewater, when in use, wastewater enters the first stage denitrification host 16 inside the device body 1 through the water inlet 2, and flows into the aeration tank 17 uniformly through the water distribution plate 19. The wastewater in the aeration tank 17 stays for 10-30 min, completes the shallow stripping, ammonia nitrogen is separated from the wastewater, and enters the next stage through the overflow weir 18, and reaches the standard after multi-stage treatment to enter the subsequent treatment process or discharge.

[0040] The air outlet of the aeration system 11 is heated by the heating resistor 12, reaches the preset temperature, enters each stage of the denitrification host 16 through the inorganic ceramic microporous aeration pipe 15 of the aeration pipe 13, and adjusts the air volume according to the concentration. The hot air enters the aeration tank 17 through the inorganic ceramic microporous aeration pipe 15 at the bottom of each stage of the denitrification host 16, and forms small and uniformly dispersed bubbles as the carrier gas for ammonia nitrogen separation. After the bubbles contact with the wastewater, ammonia nitrogen enters the bubbles, the bubbles gradually expand, and finally separate from the wastewater into the gas hood 7. The ammonia nitrogen gas in the gas hood 7 enters the absorption tower 5 through the exhaust pipe 6, the dilute sulfuric acid spray in the absorption tower 5 contacts with the ammonia nitrogen-containing air, and reacts to form ammonium sulfate. The ammonium sulfate concentration is continuously increased to achieve the purpose of resource utilization, and the air is discharged into the atmosphere through the chimney.

[0041] The alkali solution is added to each stage of the denitrification host 16 through the medicine box 4 and the dosing system 3, the dosing amount of each stage is controlled according to the pH probe 20 arranged at each stage of the denitrification host 16, the pH of each stage of reaction is ensured to be a set value, and the purpose of saving reagents is achieved.

[0042] Since the shallow stripping is adopted, the ammonia nitrogen in the wastewater can be quickly separated, and the pressure of the aeration system 11 is also very low, thereby reducing the energy consumption.

[0043] The inorganic ceramic microporous aeration pipe 15 is adopted, which is corrosion-resistant and has a long service life.

[0044] The inorganic ceramic microporous aeration pipe 15 has a small pore size, can form a large number of micron-sized bubbles, greatly increases the gas-liquid contact area, and improves the separation efficiency.

[0045] The carrier gas of the aeration pipe 13 passes through the heating resistor 12, the temperature of the carrier gas is increased, the device has good treatment effect under low temperature conditions, and compared with directly heating the wastewater, the energy consumption is saved.

[0046] The ammonia nitrogen concentration of each stage of the denitrification host 16 gradually decreases from top to bottom, the reagent addition amount and air flow distribution can be allocated according to the actual concentration, the purpose of precise control is achieved, the treatment efficiency is improved, and the operation cost is reduced.

[0047] After the ammonia nitrogen-containing air is absorbed by the absorption tower 5, the purpose of resource utilization is achieved, and secondary pollution is prevented.

[0048] The above shows and describes the basic principles and main features of the present application and the advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A modular treatment device for ammonia nitrogen wastewater, comprising a device body (1), an absorption tower (5), an aeration system (11), and a dosing system (3), characterized in that: The device body (1) has a denitrification host (16) installed in its inner cavity. An aeration tank (17) is provided in the inner cavity of the denitrification host (16). An overflow weir (18) is installed on the side of the denitrification host (16). The top of the absorption tower (5) is equipped with a circulation pipe (10), the outer flange of the circulation pipe (10) is connected to a circulation pump (9), the other end of the circulation pipe (10) is equipped with a dilute sulfuric acid storage tank (8), and the top of the denitrification host (16) is equipped with a gas collection hood (7). The aeration system (11) includes a heating resistor (12), an aeration pipe (13), a temperature control probe (14), and an inorganic ceramic microporous aeration pipe (15).

2. The modular treatment device for ammonia nitrogen wastewater according to claim 1, characterized in that: The number of the denitrification host (16) is at least four. The denitrification host (16) is connected in series in the inner cavity of the device body (1). The overflow weir (18) at the top and bottom of the denitrification host (16) is in opposite positions. The top of the outer wall of the device body (1) is equipped with a water inlet (2). The water inlet (2) is used to input ammonia nitrogen wastewater into the inner cavity of the top denitrification host (16). Each denitrification host (16) allows ammonia nitrogen wastewater to circulate through the overflow weir (18).

3. A modular treatment device for ammonia nitrogen wastewater according to claim 1, characterized in that: A water distribution plate (19) is installed at the top of the inner cavity of the aeration tank (17), a pH probe (20) is installed at the water distribution plate (19), and the inorganic ceramic microporous aeration pipe (15) is located at the bottom of the inner cavity of the aeration tank (17).

4. A modular treatment device for ammonia nitrogen wastewater according to claim 1, characterized in that: The absorption tower (5) is equipped with an exhaust pipe (6) on its side. The exhaust pipe (6) is connected to the gas collection hood (7). The gas collection hood (7) is installed in the inner cavity of the device body (1). The dilute sulfuric acid storage tank (8) is connected to the absorption tower (5) through a pipe. The number of gas collection hoods (7) is the same as that of the denitrification host (16).

5. A modular treatment device for ammonia nitrogen wastewater according to claim 1, characterized in that: The aeration system (11) is an aeration blower. The aeration system (11) is connected to the heating resistor (12). The aeration pipe (13) is connected to the heating resistor (12). The aeration pipe (13) is connected to the inorganic ceramic microporous aeration pipe (15). The temperature control probe (14) is installed at the aeration pipe (13). The temperature control probe (14) is used to monitor the temperature inside the aeration pipe (13). The number of inorganic ceramic microporous aeration pipes (15) is the same as that of the denitrification host (16).

6. A modular treatment device for ammonia nitrogen wastewater according to claim 1, characterized in that: The dosing system (3) is a dosing pipeline. The dosing pipeline is connected to the medicine tank (4) through an infusion pump. The number of dosing pipelines is the same as that of the denitrification host (16). The other end of the dosing pipeline passes through the outer wall of the device body (1) and extends into the inner cavity of the device body (1). The dosing pipeline is used to inject alkaline solution into the inner cavity of the denitrification host (16).

7. A modular treatment device for ammonia nitrogen wastewater according to claim 1, characterized in that: A drain pipe is installed at the bottom of the side of the device body (1). The drain pipe is located on the side of the bottom overflow weir (18). The aeration volume of each inorganic ceramic microporous aeration pipe (15) is adjusted by a regulating valve installed at the aeration pipe (13).

8. A modular treatment device for ammonia nitrogen wastewater according to claim 1, characterized in that: The gas collection hood (7) and the exhaust pipe (6) are used to input the ammonia nitrogen waste gas in the wastewater into the inner cavity of the absorption tower (5), which is a reverse spray type.

9. A modular treatment device for ammonia nitrogen wastewater according to claim 1, characterized in that: Both the water inlet (2) and the dosing system (3) are flanged and equipped with electric regulating valves and electromagnetic flow meters.

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