Ammonia-containing waste gas treatment system

Abstract

The utility model discloses an ammonia-containing waste gas treatment system which is characterized in that an air entraining fan is connected with a deodorization box body, and an exhaust port is formed in the deodorization box body, so that ammonia-containing waste gas enters and exits from the deodorization box body; circulating water containing activated sludge is placed in the circulating water tank, the circulating water tank is connected with the spraying assembly of the deodorization box body through a circulating water pump, and the circulating water tank is connected with the lower part of the deodorization box body through a water outlet pipeline so as to realize reciprocating circulation of the circulating water between the circulating water tank and the deodorization box body; a filler is arranged in the deodorization box body, and the waste gas and the circulating water are subjected to multi-stage reverse contact reaction in the filler; an aeration assembly is arranged at the bottom of the deodorization box body so as to realize circulating water oxygenation and conversion of ammonia nitrogen into nitrite nitrogen, the circulating water tank is connected with the anaerobic ammonia oxidation system, and circulating water enters the anaerobic ammonia oxidation system for biochemical denitrification after being filtered and then enters the circulating water tank after denitrification is completed. The ammonia-containing waste gas treatment device has the characteristics of compact structure, high stability, good purification effect and the like, and the treatment efficiency of ammonia-containing waste gas is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sludge and waste gas, and in particular to a system for treating ammonia-containing waste gas generated in a sludge treatment process. Background Art

[0002] With the gradual acceleration of urban sewage treatment construction and the increasing rate of centralized sewage treatment, the amount of sludge generated by sewage treatment plants has gradually increased. The high-dryness dehydration and drying of sludge has become an important part of resource utilization, including garbage blending, cement kiln blending, brick making, etc. In the process of high-dryness dehydration of sludge, some alkaline auxiliary materials such as lime are generally added to enhance the dehydration effect, causing the nitrogen in the sludge to volatilize in the form of free ammonia. Moreover, modern industrial plants basically have negative pressure ventilation conditions, so the treatment of centralized, large-volume waste gas containing high-concentration ammonia to meet standards has become a problem.

[0003] There are many existing waste gas treatment methods, including physical, chemical and biochemical methods, etc. The process selection is mainly based on the waste gas composition, content, gas volume and comprehensive cost. According to the detection of the waste gas composition, it is shown that the main pollutant is ammonia, with a concentration of more than 100ppm, and the remaining components of hydrogen sulfide, sulfur-containing and nitrogen-containing components are extremely low, and the concentration is below the detection limit.

[0004] The existing technical methods for treating high-concentration and atmospheric ammonia-containing waste gas have the following defects:

[0005] 1) The main component of the exhaust gas is ammonia, which is easily soluble in water. The spraying and adsorption method will cause the continuous accumulation of nitrogen in the circulating water. There will be problems of large water consumption and pollutant transfer through continuous circulating water replacement. At the same time, ammonia dissolves in water to form alkalinity. As the pH of the circulating water rises, the solubility of ammonia in water gradually decreases. By adding inorganic acid to adjust the pH, chloride ions and sulfate ions will corrode the steel structure of the box. At the same time, the acid consumption is large, which is not environmentally friendly and energy-saving.

[0006] 2) The price of adding denitrification biological agents is relatively high. Due to the harsh environment inside the box, the effect of the agents is difficult to maintain and it is difficult for them to adhere to the filler. The strains need to be continuously replenished, resulting in high operating costs.

[0007] 3) Other waste gas treatment technologies such as high temperature oxidation, UV photolysis, catalytic oxidation, etc. do not meet the on-site atmospheric volume conditions and have high investment and operating costs. Utility Model Content

[0008] The technical problem to be solved by the utility model is: in view of the problem of treating waste gas with high ammonia concentration and large gas volume generated in the process of high-dryness sludge treatment in the prior art, an ammonia-containing waste gas treatment system is provided which has a compact structure, convenient operation, high stability and good purification effect.

[0009] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0010] A system for treating ammonia-containing waste gas, comprising: an induced air fan, a deodorizing box, a circulating water tank and an anaerobic ammonia oxidation system; the induced air fan is connected to the air inlet of the deodorizing box through an air inlet pipe, and the deodorizing box is provided with an exhaust port to enable the ammonia-containing waste gas to enter and exit the deodorizing box; circulating water containing activated sludge is placed in the circulating water tank, the circulating water tank is connected to the spray assembly in the deodorizing box through a circulating water pump, and the circulating water tank is connected to the lower part of the deodorizing box through an outlet pipe to enable the circulating water to circulate back and forth between the circulating water tank and the deodorizing box; a filler is provided in the deodorizing box, and the waste gas and the circulating water undergo a multi-stage reverse contact reaction in the filler to enable the ammonia in the waste gas to dissolve in the circulating water; an aeration assembly is provided at the bottom of the deodorizing box to oxygenate the circulating water, convert the ammonia nitrogen in the circulating water into nitrite nitrogen through the biochemical action of ammonia nitrogen oxidation, and reduce the pH value of the circulating water;

[0011] The circulating water tank is connected to the anaerobic ammonium oxidation system through an outlet pipe with a drainage pump, and a filtering device is provided between the drainage pump and the anaerobic ammonium oxidation system. The circulating water tank is connected to the anaerobic ammonium oxidation system through an inlet pipe with an inlet pump; the circulating water in the circulating water tank enters the filtering device through the drainage pump for sludge filtration, and the generated filtered clear liquid enters the anaerobic ammonium oxidation system for biochemical denitrification. After denitrification is completed, it enters the circulating water tank through the inlet pump, and this cycle is repeated to achieve recycling.

[0012] As a further improvement of the utility model, a temperature detector, a DO detector and a pH detector are installed in the circulating water tank to monitor the physical and chemical parameters of the circulating water in real time.

[0013] As a further improvement of the utility model, a heater is also installed in the circulating water tank, and the temperature detector is linked to the heater.

[0014] As a further improvement of the utility model, an ammonia detector is arranged on the exhaust port to detect the ammonia content in the exhaust gas in real time.

[0015] As a further improvement of the utility model, the aeration assembly includes an oxygen supply fan and an aeration head, a plurality of the aeration heads are evenly distributed at the bottom of the deodorizing box, and the oxygen supply fan is linked to a DO detector.

[0016] As a further improvement of the utility model, the spray assembly includes a spray pipe and an atomizing nozzle, the spray pipe is connected to a circulating water pump, and a plurality of atomizing nozzles are arranged in sequence on the spray pipe to achieve uniform spraying of the circulating water in the deodorizing box.

[0017] As a further improvement of the utility model, the filtering device adopts a UF membrane device.

[0018] The innovation of the utility model is that: by studying various waste gas treatment methods from the aspects of treatment effect, applicability, economy and environmental protection, the waste gas generated in the process of sludge high dryness dehydration and drying has a high ammonia concentration (NH 3 >100ppm), large gas volume (80,000-100,000m 3 / h), a combined process of enhanced biochemical adsorption + anaerobic ammonium oxidation denitrification was developed to introduce wastewater biochemical treatment technology into waste gas treatment, and the advantages of ammonia being easily soluble in water and anaerobic ammonium oxidation being highly efficient in denitrification were utilized to achieve a comprehensive effect of good treatment effect, simple process, stable operation, low investment and operation cost, low energy consumption, and no secondary pollution. The principle of the treatment system is:

[0019] 1) Theoretically, the volume ratio of ammonia dissolved in water is 700:1, and ammonia dissolved in water forms OH - Alkalinity: As the pH of the circulating water increases, the solubility of ammonia gradually decreases until it reaches NH 4 + Absorption and NH 3 The equilibrium of volatilization, the chemical formula is as follows:

[0020]

[0021] 2) Ammonia nitrogen is converted into NO by biochemical oxidation and can form nitrogen oxidation 2 - (short-cut nitrification process) or NO 3 - (Full nitrification process), and has the effect of acid production. At the same time, this type of bacteria is chemically autotrophic and does not require organic matter consumption. The chemical formula is as follows:

[0022] NH 4 + +1.5O 2 →NO 2 - +H 2 O+2H + (1 mol NH 4 + Produces 2 mol hydrogen ion acidity)

[0023] 3) Under anaerobic conditions, with ammonia as the electron donor and nitrite as the electron acceptor, nitrite nitrogen and ammonia nitrogen are converted into nitrogen gas at a theoretical ratio of 1.32, and a certain alkalinity is generated at the same time. The reaction formula is as follows:

[0024] 1NH 4 + +1.32NO 2 - +0.066HCO3 - +0.13H + →1.02N 2 +0.26NO 3 - +0.066CH 2 O 0.5 N 0.15 +2.03H 2 O.

[0025] The utility model establishes a technical system for efficiently and environmentally friendly treatment of such waste gas by adopting a combined system of enhanced biochemical absorption + anaerobic ammonia oxidation denitrification. Compared with the existing technology, it has the advantages of good treatment effect, low cost, energy saving and environmental protection.

[0026] Compared with the prior art, the advantages of the utility model are:

[0027] The ammonia-containing waste gas treatment system of the utility model is characterized in that circulating water containing activated sludge is placed in a circulating water tank, and the circulating water tank is connected to a spray assembly in a deodorizing box through a circulating water pump, and the circulating water tank is connected to the lower part of the deodorizing box through a water outlet pipe, so that the circulating water can circulate back and forth between the circulating water tank and the deodorizing box; by arranging a filler in the deodorizing box, the waste gas and the circulating water can undergo a multi-stage reverse contact reaction in the filler, so that the ammonia in the waste gas can be dissolved in the circulating water, thereby achieving the purpose of purifying and absorbing the ammonia; by arranging an aeration assembly at the bottom of the deodorizing box, oxygenation in the circulating water can be achieved, and the ammonia nitrogen in the circulating water can be converted into nitrite nitrogen by utilizing the biochemical oxidation of ammonia nitrogen, and the pH value of the circulating water can be reduced at the same time; further, the circulating water tank is connected to the deodorizing box through a water outlet pipe with a drainage pump. The anaerobic ammonium oxidation system is connected, and a filtering device is provided between the drainage pump and the anaerobic ammonium oxidation system, and the circulating water tank is connected to the anaerobic ammonium oxidation system through an inlet pipe with an inlet pump; the circulating water in the circulating water tank enters the filtering device through the drainage pump for sludge filtration, and the generated filtered clear liquid enters the anaerobic ammonium oxidation system for biochemical denitrification, and after denitrification is completed, it enters the circulating water tank through the inlet pump, and such repeated cycles realize recycling; in the utility model, by adopting a combined system of enhanced biochemical adsorption + anaerobic ammonium oxidation denitrification, the wastewater biochemical treatment technology is introduced into the waste gas treatment, and the property of ammonia being easily soluble in water and the advantage of anaerobic ammonium oxidation high-efficiency denitrification are utilized to achieve the comprehensive effects of good treatment effect, simple process, stable operation, low investment and operation cost, low energy consumption and no secondary pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the structural principle of the ammonia-containing waste gas treatment system in a specific embodiment of the utility model;

[0029] Figure 2 This is a schematic diagram of the process of treating ammonia-containing waste gas in a specific embodiment of the utility model;

[0030] Legend: 1. Air intake fan; 2. Deodorization box; 3. Exhaust port; 4. Circulating water tank; 5. Circulating water pump; 6. Spray pipe; 7. Atomizing nozzle; 8. Filler; 9. Oxygen supply fan; 10. Aeration head; 11. Drain pump; 12. UF membrane device; 13. Anaerobic ammonia oxidation system; 14. Water inlet pump; 15. Temperature detector; 16. DO detector; 17. pH detector; 18. Ammonia detector; 19. Heater. DETAILED DESCRIPTION

[0031] The present invention is further described below in conjunction with the accompanying drawings and specific preferred embodiments, but the protection scope of the present invention is not limited thereby.

[0032] In the description of the present invention, it should be understood that the terms "side", "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0034] Example 1

[0035] like Figure 1As shown, the ammonia-containing waste gas treatment system of the utility model comprises: an induced air fan 1, a deodorizing box 2, a circulating water tank 4 and an anaerobic ammonia oxidation system 13. The induced air fan 1 is connected to the air inlet of the deodorizing box 2 through an air inlet pipe, and the deodorizing box 2 is provided with an exhaust port 3 to enable the ammonia-containing waste gas to enter and exit the deodorizing box 2. Circulating water containing activated sludge is placed in the circulating water tank 4, and the circulating water tank 4 is connected to the spray assembly in the deodorizing box 2 through a circulating water pump 5. The circulating water tank 4 is connected to the lower part of the deodorizing box 2 through an outlet pipe to achieve reciprocating circulation of the circulating water between the circulating water tank 4 and the deodorizing box 2. A packing 8 is provided in the deodorizing box 2, and the waste gas and the circulating water undergo a multi-stage reverse contact reaction in the packing 8 to achieve the dissolution of ammonia in the waste gas into the circulating water. An aeration component is provided at the bottom of the deodorizing box 2 to achieve oxygenation of the circulating water, convert ammonia nitrogen in the circulating water into nitrite nitrogen through the biochemical action of ammonia nitrogen oxidation, and reduce the pH value of the circulating water. In this embodiment, the function of the filler 8 is mainly to prolong the contact time between the exhaust gas and the circulating water and to increase the absorption rate of ammonia as much as possible. The filler 8 can adopt a conventional setting.

[0036] The circulating water tank 4 is connected to the anaerobic ammonium oxidation system 13 through an outlet pipe with a drainage pump 11, and a UF membrane device 12 is provided between the drainage pump 11 and the anaerobic ammonium oxidation system 13. The circulating water in the circulating water tank 4 enters the UF membrane device 12 through the drainage pump 11 for sludge filtration, and the resulting membrane clear liquid enters the anaerobic ammonium oxidation system 13 for biochemical denitrification. After denitrification, it enters the circulating water tank 4 through the inlet pump 14, and the cycle is repeated to achieve recycling. By utilizing the weak acidity of the circulating water and the weak base of the anaerobic ammonium oxidation to achieve water neutralization, while achieving nitrogen removal, the amount of acid added for pH adjustment of the anaerobic ammonium oxidation is reduced.

[0037] like Figure 1 As shown, the circulating water tank 4 is equipped with a temperature detector 15, a DO detector 16, a pH detector 17 and a heater 19. The temperature detector 15 is linked with the heater 19 to automatically adjust the water temperature to ensure that the activated sludge is in a better active state. Since the activated sludge in the circulating water tank 4 is in a state of continuous reproduction and the reproduction speed is relatively fast, the content of activated sludge in the circulating water is also sufficient to meet the needs of waste gas treatment, so there is no need to frequently inoculate new activated sludge in the circulating water tank 4. At the same time, a stirring device is also provided in the circulating water tank 4, so that the activated sludge and water are in a state of circulating stirring for uniform distribution.

[0038] like Figure 1 As shown, an ammonia detector 18 is provided on the exhaust port 3 to detect the ammonia content in the exhaust gas in real time and timely grasp the effect of the exhaust gas treatment.

[0039] like Figure 1As shown, the aeration assembly includes an oxygen supply fan 9 and an aeration head 10, and a plurality of aeration heads 10 are evenly distributed at the bottom of the deodorizing box 2. The oxygen supply fan 9 is linked with the DO detector 16 to automatically adjust the air volume, continuously oxygenate the circulating water, and use the biochemical principle that the alkalinity produced by ammonia dissolution is less than the acidity produced by ammonia nitrogen oxidation to reduce the pH of the circulating water through biochemical action, thereby achieving the effect of continuous absorption of ammonia.

[0040] like Figure 1 As shown, the spray assembly includes a spray pipe 6 and an atomizing nozzle 7, the spray pipe 6 is connected to the circulating water pump 5, and a plurality of atomizing nozzles 7 are sequentially arranged on the spray pipe 6 to achieve uniform spraying of the circulating water in the deodorizing box 2. Moreover, the waste gas and the circulating water are in countercurrent contact in the deodorizing box 2, which increases the contact area and contact time between the waste gas and the circulating water, and is conducive to more fully absorbing the ammonia in the waste gas.

[0041] In this embodiment, by placing circulating water containing activated sludge in the circulating water tank 4, and the circulating water tank 4 is connected to the spray assembly in the deodorizing box 2 through the circulating water pump 5, the circulating water tank 4 is connected to the lower part of the deodorizing box 2 through the outlet pipe, so that the circulating water is circulated back and forth between the circulating water tank 4 and the deodorizing box 2. By providing a filler 8 in the deodorizing box 2, the waste gas and the circulating water are subjected to a multi-stage reverse contact reaction in the filler 8, that is, the ammonia in the waste gas is dissolved in the circulating water, and the purpose of ammonia purification and absorption is achieved. By providing an aeration component at the bottom of the deodorizing box 2, oxygenation of the circulating water is achieved, and the ammonia nitrogen in the circulating water is converted into nitrite nitrogen by the biochemical oxidation of ammonia nitrogen, and the pH value of the circulating water is reduced. Further, the circulating water tank 4 is connected to the anaerobic ammonia oxidation system 13 through the outlet pipe with the drainage pump 11, and a UF membrane device 12 is provided between the drainage pump 11 and the anaerobic ammonia oxidation system 13, and the circulating water tank 4 is connected to the anaerobic ammonia oxidation system 13 through the inlet pipe with the inlet pump 14. The circulating water in the circulating water tank 4 enters the UF membrane device 12 through the drainage pump 11 for sludge filtration, and the resulting membrane clear liquid enters the anaerobic ammonia oxidation system 13 for biochemical denitrification. After denitrification, it enters the circulating water tank through the water inlet pump 14, and the recycling is realized by repeated cycles. In this embodiment, by adopting a combined process of enhanced biochemical adsorption + anaerobic ammonia oxidation denitrification, the wastewater biochemical treatment technology is introduced into the waste gas treatment, and the property of ammonia being easily soluble in water and the advantage of anaerobic ammonia oxidation for efficient denitrification are utilized to achieve a comprehensive effect of good treatment effect, simple process, stable operation, low investment and operation cost, low energy consumption, and no secondary pollution.

[0042] like Figure 2 As shown, the ammonia-containing waste gas treatment system of the present invention comprises the following steps when treating ammonia-containing waste gas:

[0043] Step S1, inoculate the short-range nitrification sludge into the circulating water tank 4, maintain the MLSS in the water at 5-10 g / L, and the exhaust fan 1 draws the ammonia-containing waste gas with a concentration greater than 100 ppm into the deodorizing box 2, and realizes multi-stage reverse contact between the circulating water and the ammonia-containing waste gas in the filler 8 of the deodorizing box 2 through the circulating water pump 5 and the spray assembly, so that the ammonia in the waste gas is dissolved in the water.

[0044] Step S2, oxygenating the circulating water containing activated sludge in the deodorizing box 2 by the oxygen supply fan 9, controlling DO at 1-2 mg / L, and controlling the temperature of the circulating water entering the deodorizing box 2 at 30-35°C by the heater 19.

[0045] Step S3: The circulating water in the circulating water tank 4 is filtered through the UF device 12 to filter the sludge, and NO in the membrane clear liquid is 2 - :NH 4 + The concentration ratio is 1 to 1.5:1, and the membrane clear liquid enters the anaerobic ammonia oxidation system 13 for denitrification treatment. The circulating water after denitrification is returned to the circulating water tank 4 for recycling.

[0046] Step S4: the waste gas after purification is discharged through the exhaust port 3 to meet the limit value of the "Emission Standard of Odor Pollutants" (GB14554-93).

[0047] In step S1 of this embodiment, the residence time of the waste gas in the deodorizing box 2 is 40s to 60s, and the gas-water ratio is 300 to 500:1 (m 3 / m 3 ).

[0048] In step S2 of the present embodiment, ammonia nitrogen in the circulating water is converted into nitrite nitrogen and acidity is generated at the same time, and the alkalinity produced by the dissolution of ammonia is less than the acidity produced by the oxidation of ammonia nitrogen, thereby reducing the pH of the circulating water to 5.5-6.5. The weakly acidic circulating water is then repeatedly circulated to contact with the exhaust gas to reduce the ammonia concentration in the exhaust gas; the range of the activated sludge load in the circulating water is 0.05-0.1 kgN / (kgMLSS·d).

[0049] In step S4 of this embodiment, the ratio of the daily continuous inflow and outflow of circulating water in the deodorizing box 2 to the total water volume is 0.5-1.0:1, that is, a portion of circulating water is always retained in the lower part of the deodorizing box 2 to ensure that the waste gas is absorbed by the circulating water when passing through the lower part of the deodorizing box 2, thereby improving the ammonia purification quality. The anaerobic ammonia oxidation system 13 adopts a continuous flow operation mode, and the operating pH in the system is 7.5±0.5. A strain interception device is provided inside the system, and the reclaimed water after denitrification is returned to the circulating water tank 4 for recycling, forming a water circulation and continuous absorption and removal of nitrogen.

[0050] In this embodiment, circulating spray water containing activated sludge is continuously brought into contact with the waste gas, and at the same time, the microorganisms in the activated sludge convert the ammonia nitrogen dissolved in water into nitrite nitrogen and reduce the pH value of the spray water, thereby achieving the effect of continuous absorption of ammonia. The spray wastewater is subjected to membrane separation and then anaerobic ammonia oxidation treatment to achieve the removal of nitrogen before being recycled as spray water. Through the recycling of reclaimed water, the wastewater discharge and treatment costs are not increased. It has the advantages of good treatment effect, low cost, energy saving and environmental protection, thereby promoting the development of sludge treatment technology.

[0051] Example 2

[0052] The ammonia concentration in the waste gas generated by a sludge treatment project is 120ppm, and the waste gas volume is 80000m 3 / h, using this technical solution, the short-range nitrification sludge concentration is inoculated in the deodorization box to 7g / L, and the high-concentration ammonia-containing waste gas enters the deodorization box and is in multi-stage reverse contact with the circulating water containing activated sludge in the box filler. The waste gas stays in the box for 40s, and the gas-water ratio is 400:1 (m 3 / m 3 ).

[0053] A fan is used to oxygenate the circulating water containing activated sludge inside the box to increase the DO to 1-2 mg / L, and a heater is used to maintain the circulating water temperature at 30-35°C. At this time, the pH of the circulating water is in the range of 6.0-6.5, and the activated sludge load in the circulating water is 0.05 kgN / (kgMLSS·d).

[0054] After the circulating water passes through the UF device to filter the sludge, the water quality of the membrane clear liquid is as follows: c(NO 2 - ) is 500 mg / L, c(NH 4 + ) is 410mg / L, c(NO 3 - ) is 25 mg / L, NO 2 - :NH 4 + The concentration ratio is 1.2, and the ratio of the daily continuous inflow and outflow of circulating water in the deodorization box 2 to the total water volume is 0.5. The clear liquid enters the anaerobic ammonium oxidation system for denitrification. The anaerobic ammonium oxidation adopts a continuous flow operation mode, and a bacterial species interception device is set inside. The water quality of the reclaimed water after denitrification is: c(NO 2 - ) is 5 mg / L, c(NH 4 + ) is 35mg / L, c(NO 3 - ) is 65mg / L and then returned to the circulating water tank for recycling.

[0055] According to the ammonia detector, the ammonia concentration at the gas outlet was 20ppm on the 10th day after the system was started, and the removal rate was 83%; on the 20th day, the ammonia concentration at the gas outlet was 21ppm, and the removal rate was 83%; after 3 months, the ammonia concentration at the gas outlet was 18ppm, and the removal rate was 85%. It meets the limit value of the "Emission Standard of Odor Pollutants" (GB14554-93).

[0056] Example 3

[0057] The ammonia concentration in the waste gas generated by a sludge treatment project is 100ppm, and the waste gas volume is 70000m 3 / h, using this technical solution, the concentration of short-range nitrification sludge inoculated in the deodorization box is 5g / L, the waste gas stays in the box for 35s, and the gas-water ratio is 350:1 (m 3 / m 3 ).

[0058] A fan is used to oxygenate the circulating water containing activated sludge inside the box to increase the DO to 1-2 mg / L, and a heater is used to maintain the circulating water temperature at 30-35°C. At this time, the pH of the circulating water is in the range of 6.0-6.5, and the activated sludge load in the circulating water is 0.05 kgN / (kgMLSS·d).

[0059] After the circulating water passes through the UF device to filter the sludge, the water quality of the membrane clear liquid is as follows: c(NO 2 - ) is 450 mg / L, c(NH 4 + ) is 390mg / L, c(NO 3 - ) is 30mg / L, NO 2 - :NH 4 + The concentration ratio is 1.15, and the ratio of the daily continuous inflow and outflow of circulating water in the deodorization box 2 to the total water volume is 1. The clear liquid enters the anaerobic ammonium oxidation system for denitrification. The anaerobic ammonium oxidation adopts a continuous flow operation mode, and a bacterial species interception device is set inside. The water quality of the reclaimed water after denitrification is: c(NO 2 - ) is 0mg / L, c(NH 4 + ) is 50mg / L, c(NO 3 - ) is 86mg / L, and then returned to the circulating water tank for recycling. Detected by an ammonia detector, the ammonia concentration at the gas outlet is 10ppm, and the removal rate is 90%.

[0060] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. An ammonia-containing waste gas treatment system, characterized in that: include: An induced air fan (1), a deodorizing box (2), a circulating water tank (4) and an anaerobic ammonia oxidation system (13); the induced air fan (1) is connected to the air inlet of the deodorizing box (2) through an air inlet pipe, and the deodorizing box (2) is provided with an exhaust port (3) to enable ammonia-containing waste gas to enter and exit the deodorizing box (2); circulating water containing activated sludge is placed in the circulating water tank (4), and the circulating water tank (4) is connected to the spraying assembly in the deodorizing box (2) through a circulating water pump (5). The water pipe is connected to the lower part of the deodorizing box (2) to realize the reciprocating circulation of the circulating water between the circulating water tank (4) and the deodorizing box (2); the deodorizing box (2) is provided with a filler (8), and the waste gas and the circulating water are subjected to a multi-stage reverse contact reaction in the filler (8) to realize the dissolution of ammonia in the waste gas into the circulating water; the bottom of the deodorizing box (2) is provided with an aeration component to realize the oxygenation of the circulating water, convert the ammonia nitrogen in the circulating water into nitrite nitrogen through the biochemical oxidation of ammonia nitrogen, and reduce the pH value of the circulating water; The circulating water tank (4) is connected to the anaerobic ammonium oxidation system (13) via a water outlet pipe with a drainage pump (11), and a filtering device is provided between the drainage pump (11) and the anaerobic ammonium oxidation system (13). The circulating water tank (4) is connected to the anaerobic ammonium oxidation system (13) via a water inlet pipe with a water inlet pump (14); the circulating water in the circulating water tank (4) enters the filtering device through the drainage pump (11) for sludge filtration, and the generated filtered clear liquid enters the anaerobic ammonium oxidation system (13) for biochemical denitrification. After denitrification is completed, the filtered clear liquid enters the circulating water tank (4) through the water inlet pump (14), and the circulation is repeated to achieve recycling.

2. The ammonia-containing waste gas treatment system according to claim 1, characterized in that: The circulating water tank (4) is equipped with a temperature detector (15), a DO detector (16) and a pH detector (17) to monitor the physical and chemical parameters of the circulating water in real time.

3. The ammonia-containing waste gas treatment system according to claim 2, characterized in that: A heater (19) is also installed in the circulating water tank (4), and the temperature detector (15) is linked to the heater (19).

4. The ammonia-containing waste gas treatment system according to claim 1, characterized in that: An ammonia detector (18) is arranged on the exhaust port (3) to detect the ammonia content in the exhaust gas in real time.

5. The ammonia-containing waste gas treatment system according to claim 3, characterized in that: The aeration component comprises an oxygen supply fan (9) and an aeration head (10); a plurality of the aeration heads (10) are evenly distributed at the bottom of the deodorizing box (2); and the oxygen supply fan (9) is linked to a DO detector (16).

6. The ammonia-containing waste gas treatment system according to any one of claims 1 to 5, characterized in that: The spray assembly comprises a spray pipe (6) and an atomizing nozzle (7); the spray pipe (6) is connected to a circulating water pump (5); a plurality of atomizing nozzles (7) are arranged in sequence on the spray pipe (6) to achieve uniform spraying of circulating water in the deodorizing box (2).

7. The ammonia-containing waste gas treatment system according to any one of claims 1 to 5, characterized in that: The filtering device adopts a UF membrane device (12).

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