A high-organic high-ammonia wastewater full-process treatment device and treatment method

Abstract

The present application relates to wastewater treatment technical field, especially to a kind of high organic matter high ammonia wastewater's whole process processing device and processing method.The present application provides a kind of high organic matter high ammonia wastewater's whole process processing device, including sequentially connected anaerobic tower, short-path denitrification-anaerobic ammonia oxidation pool, nitrosation-anaerobic ammonia oxidation pool, denitrification swing pool, intermediate sedimentation tank, denitrification tank, nitrification carbon removal pool and final sedimentation tank.The processing device is placed in front of short-path denitrification-anaerobic ammonia oxidation pool, effectively avoid the influence of organic matter on subsequent autotrophic denitrification microorganism denitrification.And the processing device treats high organic matter high ammonia wastewater with the characteristics of low cost, high efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wastewater treatment, and particularly relates to a full-process treatment device and treatment method for high-organic and high-ammonia wastewater. BACKGROUND

[0002] With the development of science and technology, the discharge amount of high-organic and high-ammonia wastewater is increasing year by year, for example, kitchen and fermentation, etc. For this kind of wastewater, the traditional process recovers energy by anaerobic methanation, and then carries out biological denitrification by nitrification / denitrification process. In this coupling process, a large amount of organic matter is needed for denitrification denitrification, which leads to that the organic matter in the front anaerobic methanation process cannot be fully recovered. Secondly, a large amount of aeration is needed for the nitrification process to convert ammonia nitrogen into nitrate. In order to fully utilize the organic carbon source in the raw water for denitrification, the nitrification liquid of the subsequent nitrification process needs to be returned to the front denitrification tank for denitrification. High aeration amount and high reflux ratio lead to high power consumption, and finally the cost of denitrification is extremely high.

[0003] As a new type of autotrophic biological denitrification technology, partial nitritation / anaerobic ammonia oxidation has the advantages of low carbon source dependence, high efficiency and low aeration power consumption, and has received extensive attention in the process of high-ammonia wastewater treatment. However, the growth conditions of anaerobic ammonia oxidation bacteria are extremely harsh, and the doubling time of functional microorganisms is as long as 7-13 days. The entry of organic matter promotes the rapid growth of heterotrophic microorganisms, and the proportion of autotrophic microorganisms will gradually decrease, which makes it difficult to realize the denitrification advantage of partial nitritation / anaerobic ammonia oxidation by controlling the sludge age. Although some studies have shown that the entry of a small amount of organic matter can promote the improvement of the denitrification efficiency of partial nitritation / anaerobic ammonia oxidation, but in the face of actual fluctuation of industrial wastewater, how to avoid the influence of high organic matter on the subsequent autotrophic denitrification is still an urgent problem to be solved. Secondly, the ammonia nitrogen concentration of industrial wastewater is prone to large-scale fluctuation due to changes in the production end, especially fermentation, kitchen waste (seasonal change of catering), food and other industries. It is well known that the fluctuation of influent ammonia nitrogen is easy to cause ammonia nitrogen accumulation in the system, not only forming free ammonia which has toxic effect on microorganisms, but also leading to the over-standard of effluent quality. Therefore, how to strengthen the system's tolerance to ammonia nitrogen shock through process construction is also an important problem in the engineering process. SUMMARY

[0004] Therefore, the purpose of the present application is to provide a full-process treatment device and treatment method for high-organic and high-ammonia wastewater. The short-cut denitrification-anaerobic ammonia oxidation tank is placed in front of the treatment device, which effectively avoids the influence of organic matter on the subsequent autotrophic denitrification.

[0005] In order to achieve the above-mentioned purpose of the application, the present application provides the following technical solutions:

[0006] The application provides a full-process treatment device for high-organic and high-ammonia wastewater, which comprises, sequentially connected, an anaerobic tower, a short-path denitrification-anaerobic ammonia oxidation pool, a nitrosation-anaerobic ammonia oxidation pool, a denitrogenation swing pool, an intermediate sedimentation pool, a denitrification pool, a nitrification carbon removal pool and a final sedimentation pool.

[0007] Preferably, the nitrosation-anaerobic ammonia oxidation pool is further connected with the short-path denitrification-anaerobic ammonia oxidation pool through a first reflux system.

[0008] The denitrogenation swing pool is further connected with the short-path denitrification-anaerobic ammonia oxidation pool through a second reflux system.

[0009] The nitrification carbon removal pool is further connected with the denitrification pool through a third reflux system.

[0010] The intermediate sedimentation pool is further connected with the short-path denitrification-anaerobic ammonia oxidation pool through a fourth reflux system.

[0011] The final sedimentation pool is further connected with the denitrification pool through a fifth reflux system.

[0012] Preferably, the anaerobic tower is an anaerobic internal circulation reactor, an anaerobic upflow sludge bed reactor or an anaerobic membrane reactor.

[0013] The COD load of the anaerobic tower is 5-15 kg / (m 3 ·d).

[0014] Preferably, the short-path denitrification-anaerobic ammonia oxidation pool, the nitrosation-anaerobic ammonia oxidation pool and the denitrogenation swing pool are all provided with biological fillers.

[0015] The biological fillers are mobile fillers or fixed fillers, when the biological fillers are the mobile fillers, the filling ratio of the biological fillers is 20-40%, and when the biological fillers are the fixed fillers, the filler spacing of the biological fillers is 150-300 mm.

[0016] Preferably, the short-path denitrification-anaerobic ammonia oxidation pool and the denitrification pool are both provided with stirring devices.

[0017] The bottom of the nitrosation-anaerobic ammonia oxidation pool, the denitrogenation swing pool and the nitrification carbon removal pool is provided with an aeration system, and the top of the nitrosation-anaerobic ammonia oxidation pool, the denitrogenation swing pool and the nitrification carbon removal pool is provided with a gas collection system.

[0018] The application further provides a method for treating high-organic and high-ammonia wastewater by using the treatment device.

[0019] The high-organic and high-ammonia wastewater is sequentially subjected to anaerobic treatment, short-cut denitrification-anaerobic ammonia oxidation denitrification, nitrosation-anaerobic ammonia oxidation denitrification, denitrification, sedimentation, denitrification, nitrification and decarburization, and final sedimentation in an anaerobic tower, a short-cut denitrification-anaerobic ammonia oxidation tank, a nitrosation-anaerobic ammonia oxidation tank, a denitrification swing tank, an intermediate sedimentation tank, a denitrification tank, a nitrification and decarburization tank, and a final sedimentation tank to obtain recovered water.

[0020] The COD concentration of the high-organic and high-ammonia wastewater is 5000-20000 mg / L, the ammonia nitrogen is 300-2000 mg / L, and the total nitrogen is 400-2000 mg / L.

[0021] Preferably, the dissolved oxygen concentration in the nitrosation-anaerobic ammonia oxidation tank is 0.5-1.5 mg / L, the dissolved oxygen concentration in the denitrification swing tank is 0-1.5 mg / L, and the dissolved oxygen concentration in the nitrification and decarburization tank is 2-3 mg / L.

[0022] The dissolved oxygen concentration in the anaerobic tower, the short-cut denitrification-anaerobic ammonia oxidation tank, the intermediate sedimentation tank, the denitrification tank, and the final sedimentation tank is all ≤0.1 mg / L.

[0023] Preferably, the suspended sludge concentration of the short-cut denitrification-anaerobic ammonia oxidation tank, the nitrosation-anaerobic ammonia oxidation tank, and the denitrification swing tank after stable operation is ≤1000 mg / L.

[0024] When the ratio of nitrite to ammonia nitrogen in the effluent of the nitrosation-anaerobic ammonia oxidation tank is 1-1.2, the dissolved oxygen in the denitrification swing tank is 0.1-0.2 mg / L.

[0025] When the ratio of nitrite to ammonia nitrogen in the effluent of the nitrosation-anaerobic ammonia oxidation tank is less than 1, the dissolved oxygen in the denitrification swing tank is 0.2-1.5 mg / L.

[0026] Preferably, when the BOD / TN of the high-organic and high-ammonia wastewater is >5, the high-organic and high-ammonia wastewater is additionally supplied into the denitrification-anaerobic ammonia oxidation tank and the denitrification tank as a supplemental source of organic carbon source in addition to being subjected to anaerobic treatment in the anaerobic tower.

[0027] When the BOD / TN of the high-organic and high-ammonia wastewater is <5, an additional carbon source is supplemented.

[0028] The application provides a high-organic-matter and high-ammonia wastewater full-process treatment device, which comprises an anaerobic tower, a short-path denitrification-anaerobic ammonia oxidation tank, a nitritation-anaerobic ammonia oxidation tank, a denitrogenation swing tank, an intermediate sedimentation tank, a denitrification tank, a nitrification carbon removal tank and a final sedimentation tank which are sequentially connected. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 For the high-organic-matter and high-ammonia wastewater full-process treatment device, 1 is the anaerobic tower, 2 is the short-path denitrification-anaerobic ammonia oxidation tank, 3 is the nitritation-anaerobic ammonia oxidation tank, 4 is the denitrogenation swing tank, 5 is the intermediate sedimentation tank, 6 is the denitrification tank, 7 is the nitrification carbon removal tank, 8 is the final sedimentation tank, 9 is the first reflux system, 10 is the second reflux system, 11 is the third reflux system, 12 is the fourth reflux system, 13 is the fifth reflux system, 14 is the high-efficiency denitrogenation system and 15 is the deep denitrogenation system. DETAILED DESCRIPTION

[0030] As shown in Figure 1 The application provides a high-organic-matter and high-ammonia wastewater full-process treatment device, which comprises an anaerobic tower, a short-path denitrification-anaerobic ammonia oxidation tank, a nitritation-anaerobic ammonia oxidation tank, a denitrogenation swing tank, an intermediate sedimentation tank, a denitrification tank, a nitrification carbon removal tank and a final sedimentation tank which are sequentially connected.

[0031] In the application, the short-path denitrification-anaerobic ammonia oxidation tank, the nitritation-anaerobic ammonia oxidation tank and the denitrogenation swing tank constitute a high-efficiency denitrogenation system; and the denitrification tank and the nitrification carbon removal tank constitute a deep denitrogenation system.

[0032] As an embodiment of the application, the anaerobic tower is preferably an anaerobic internal circulation reactor (IC), an anaerobic upflow sludge bed reactor (UASB) or an anaerobic membrane reactor; the COD load of the anaerobic tower is preferably 5-15 kg / (m 3 ·d). The material of the anaerobic internal circulation reactor (IC), the anaerobic upflow sludge bed reactor (UASB) and the anaerobic membrane reactor is preferably steel or concrete.

[0033] As an embodiment of the present application, the nitritation-anammox tank is further connected with the short-cut denitrification-anammox tank through a first reflux system; the denitrification swing tank is further connected with the short-cut denitrification-anammox tank through a second reflux system; the nitrification-decarbonization tank is further connected with the denitrification tank through a third reflux system; the intermediate sedimentation tank is further connected with the short-cut denitrification-anammox tank through a fourth reflux system; and the final sedimentation tank is further connected with the denitrification tank through a fifth reflux system. In the present application, the reflux modes of the first reflux system, the second reflux system, the third reflux system, the fourth reflux system and the fifth reflux system are independently preferably mechanical pump reflux or air-lift reflux. When the reflux mode of the first reflux system, the second reflux system, the third reflux system, the fourth reflux system or the fifth reflux system is air-lift reflux, the air-lift reflux preferably uses the gas collected by the aeration tank or the gas remaining after aeration by the air blower in the aeration system as power to reflux the sewage in the low-liquid-level tank to the high-liquid-level tank.

[0034] As an embodiment of the present application, the short-cut denitrification-anammox tank, the nitritation-anammox tank and the denitrification swing tank are each provided with biological fillers; the biological fillers are movable fillers or fixed fillers, when the biological fillers are movable fillers, the filling ratio of the biological fillers is 20-40%, and when the biological fillers are fixed fillers, the distance between the fillers is 150-300 mm.

[0035] As an embodiment of the present application, the biological fillers filled in the short-cut denitrification-anammox tank, the nitritation-anammox tank and the denitrification swing tank are biological fillers well known in the water treatment industry.

[0036] As an embodiment of the present application, the short-cut denitrification-anammox tank and the denitrification tank are each provided with a stirring device; in the present application, the stirring mode of the stirring device is preferably mechanical stirring or water and gas mixing stirring.

[0037] As an embodiment of the present application, the bottom of the nitritation-anammox tank, the denitrification swing tank and the nitrification-decarbonization tank is provided with an aeration system; and the top of the nitritation-anammox tank, the denitrification swing tank and the nitrification-decarbonization tank is provided with a gas collection system.

[0038] The present application further provides a method for treating high-organic-matter and high-ammonia wastewater by using the treatment device.

[0039] The high-organic high-ammonia wastewater is sequentially subjected to anaerobic methanation treatment of organic matter, short-cut denitrification-anaerobic ammonia oxidation denitrification, nitrosation-anaerobic ammonia oxidation denitrification, denitrification, sedimentation, denitrification, nitrification carbon removal and final sedimentation in an anaerobic tower, a short-cut denitrification-anaerobic ammonia oxidation tank, a nitrosation-anaerobic ammonia oxidation tank, a denitrification swing tank, an intermediate sedimentation tank, a denitrification tank, a nitrification carbon removal tank and a final sedimentation tank to obtain recovered water.

[0040] The COD concentration of the high-organic high-ammonia wastewater is 5000-20000 mg / L, the BOD concentration is 4000-8000 mg / L, the ammonia nitrogen is 300-2000 mg / L and the total nitrogen is 400-20000 mg / L.

[0041] In the present application, when the BOD / TN of the high-organic high-ammonia wastewater is greater than 5, the high-organic high-ammonia wastewater is used as a supplement of organic carbon source to enter the denitrification-anaerobic ammonia oxidation tank and the denitrification tank in addition to entering the anaerobic tower for anaerobic treatment. In the present application, when the high-organic high-ammonia wastewater is used as an organic carbon source to supplement short-cut denitrification-anaerobic ammonia oxidation, the amount of organic carbon source provided by the high-organic high-ammonia wastewater is the total amount of BOD in the raw water, and the total amount of BOD entering should ensure that all the nitrate in the reflux system is converted into nitrite; when the high-organic high-ammonia wastewater is used as an organic carbon source to supplement the denitrification tank, the amount of organic carbon source provided by the high-organic high-ammonia wastewater is preferably the difference between the mass of BOD in the high-organic high-ammonia wastewater and 5 times the mass of total nitrogen in the high-organic high-ammonia wastewater. The amount of high-organic high-ammonia wastewater entering the denitrification tank is preferably selected to ensure that the ratio of the organic carbon source provided by the high-organic high-ammonia wastewater to the mass concentration of nitrate in the denitrification tank is 2-3:1.

[0042] In the present application, when the BOD / TN of the high-organic high-ammonia wastewater is less than 5, the denitrification tank needs to be additionally supplemented with a carbon source.

[0043] In the present application, the COD load of the anaerobic tower is preferably 5-15 kg / (m 3 ·d), more preferably 10 kg / (m 3 ·d). In the present application, the concentration of dissolved oxygen in the anaerobic tower is preferably ≤0.1 mg / L. In the present application, the temperature in the anaerobic tower is preferably 30-35℃, and the pH is preferably 7-8. In the present application, the anaerobic tower is preferably inoculated with anaerobic methanation granular sludge, and the initial inoculation amount of the anaerobic methanation granular sludge is preferably 20-30% of the effective volume of the anaerobic tower.

[0044] When the BOD / TN in the effluent of the anaerobic tower is greater than 1, the second reflux system is opened, the nitrate in the denitrification swing tank is refluxed into the short-cut denitrification-anaerobic ammonia oxidation tank, the organic matter in the effluent of the anaerobic tower is consumed by using the nitrate, and the ratio of BOD / TN in the short-cut denitrification-anaerobic ammonia oxidation tank is controlled to be lower than 0.1, so as to further avoid the inhibition of the organic matter on the autotrophic microorganisms in the partial nitritation-anaerobic ammonia oxidation tank.

[0045] In the application, the dissolved oxygen concentration in the short-cut denitrification-anaerobic ammonia oxidation tank is preferably ≤0.1 mg / L. The short-cut denitrification-anaerobic ammonia oxidation tank is preferably inoculated with municipal sludge and anaerobic ammonia oxidation sludge, the initial inoculation amount of the municipal sludge is preferably 4000 mg MLSS / L, and the initial inoculation amount of the anaerobic ammonia oxidation sludge is preferably 4000 mg MLSS / L. The initial inoculation amount of the short-cut denitrification-anaerobic ammonia oxidation tank is preferably 4000 mg MLSS / L, and the suspended sludge concentration after stable operation is preferably ≤1000 mg / L, so as to increase the utilization rate of dissolved oxygen and the pollution load of microorganisms on the filler. In the application, the temperature in the short-cut denitrification-anaerobic ammonia oxidation tank is preferably 30-35℃, and the pH is preferably 7-8.

[0046] In the application, the short-cut denitrification-anaerobic ammonia oxidation denitrification in the short-cut denitrification-anaerobic ammonia oxidation tank uses the residual organic carbon source in the effluent of the anaerobic tower as the electron donor for denitrification, controls the nitrate denitrification in the nitrite stage, reduces the carbon source demand in the process of removing nitrate in the later stage through the coupling of short-cut denitrification-anaerobic ammonia oxidation, enhances the supply of nitrite in the process of anaerobic ammonia oxidation, and avoids the influence of organic matter on the subsequent autotrophic denitrification.

[0047] In the application, the dissolved oxygen concentration in the nitritation-anaerobic ammonia oxidation tank is preferably 0.5-1.5 mg. In the application, the suspended sludge concentration in the nitritation-anaerobic ammonia oxidation tank is preferably ≤1000 mg / L. In the application, the nitritation-anaerobic ammonia oxidation tank is preferably inoculated with common activated sludge and then domesticated, the common activated sludge is preferably residual sludge from an industry similar to the source of wastewater, and the initial inoculation amount is preferably 4000 mg MLSS / L; the domestication method is preferably gradually increasing the pollution load. In the application, the temperature in the nitritation-anaerobic ammonia oxidation tank is preferably 30-35℃, and the pH is preferably 7-8. In the application, the temperature for performing nitritation-anaerobic ammonia oxidation denitrification is preferably 35℃, and the pH is preferably 8.

[0048] In the present application, the nitritation-anaerobic ammonia oxidation denitrification in the nitritation-anaerobic ammonia oxidation tank is mainly controlled by low dissolved oxygen and free ammonia (FA) to control the stability of nitritation and the ammonia nitrogen concentration in the effluent within the range of 20-150 mg / L, which is beneficial to the system stability.

[0049] In the present application, the dissolved oxygen concentration in the denitrification swing tank is preferably 0-1.5 mg / L; more preferably, when the ratio of nitrite to ammonia nitrogen in the effluent of the nitritation-anaerobic ammonia oxidation tank is 1-1.2 (at this time, the anaerobic ammonia oxidation denitrification is dominant), the dissolved oxygen in the denitrification swing tank is 0.1-0.2 mg / L; when the ratio of nitrite to ammonia nitrogen in the effluent of the nitritation-anaerobic ammonia oxidation tank is less than 1, the dissolved oxygen in the denitrification swing tank is 0.2-1.5 mg / L (in this way, the dissolved oxygen concentration in the tank can be increased, at this time, the nitritation capacity is gradually increased and the anaerobic ammonia oxidation capacity is gradually decreased, which promotes the conversion of ammonia nitrogen as much as possible, strengthens the system resistance to ammonia nitrogen shock, provides pretreatment for the subsequent denitrification process for advanced denitrification, and reduces the power consumption of the traditional pre-denitrification process reflux nitrification liquid). In the present application, the suspended sludge concentration in the denitrification swing tank is preferably ≤1000 mg / L. In the present application, the sludge inoculated in the denitrification swing tank is preferably ordinary activated sludge, and the ordinary activated sludge is specifically municipal sludge or industry residual sludge similar to the source of wastewater, and more preferably the same as the sludge in the nitritation-anaerobic ammonia oxidation tank. In the present application, the initial inoculation amount of sludge in the denitrification swing tank is preferably 3000-5000 mg MLSS / L, and more preferably 4000 mg MLSS / L. In the present application, the temperature in the denitrification swing tank is preferably 30-35℃, and the pH is preferably 7-8.

[0050] In the present application, according to the ratio of nitrite to ammonia nitrogen in the effluent of the nitritation-anaerobic ammonia oxidation tank, the degree of nitritation is controlled, which is beneficial to the further stable removal of nitrogen, and at the same time, the ammonia nitrogen in the effluent is converted into nitrite nitrogen or nitrate nitrogen as much as possible.

[0051] In the present application, the dissolved oxygen concentration in the denitrification tank is preferably ≤0.1 mg / L. In the present application, the temperature for denitrification in the denitrification tank is preferably 35℃, and the pH value is preferably 8.

[0052] In the present application, the denitrification in the denitrification tank is directly using carbon source for advanced denitrification, which greatly reduces the burden of ammonia nitrogen conversion and reflux to the denitrification tank in the nitrification-decarbonization tank, and has the effect of energy saving and consumption reduction.

[0053] In the present application, the dissolved oxygen concentration in the nitrification-decarbonization tank is preferably 2-3 mg / L, and more preferably 3 mg / L.

[0054] In the present application, the nitrification and decarburization in the nitrification and decarburization tank is to convert the residual ammonia nitrogen into nitrite or nitrate.

[0055] In the present application, the slow-growing autotrophic microorganisms are fixed and grown by the above-mentioned microbial filler, the suspended growth of the heterotrophic bacteria is optimized by adjusting the parameters such as the suspended sludge, and then the heterotrophic bacteria flow out of the system with the water flow, which can further effectively avoid the influence of the organic matters on the denitrification of the autotrophic microbial system.

[0056] The technical solutions in the present application will be described clearly and completely in combination with the embodiments in the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0057] Embodiment 1

[0058] Treatment object: high-organic high-ammonia wastewater (COD concentration is 10000 mg / L, BOD concentration is 9000 mg / L, ammonia nitrogen concentration is 1000 mg / L, total nitrogen concentration is 1200 mg / L, BOD / TN 7.5);

[0059] Process: First, 85% of the wastewater is fed into the anaerobic IC reactor for methanation treatment. The effluent COD concentration is 800 mg / L, the BOD concentration is 700 mg / L, the ammonia nitrogen concentration is 1200 mg / L due to amination, and the total nitrogen concentration is 1200 mg / L. At this time, the IC effluent is fed into the short-cut denitrification-anaerobic ammonia oxidation tank together with the water from the first reflux system (reflux ratio 200%) of the intermediate sedimentation tank. The IC effluent converts the nitrate in the reflux liquid into nitrite, but there is still some COD left. Therefore, the effluent from the denitrification swing tank is also fed into the short-cut denitrification-anaerobic ammonia oxidation tank through the second reflux system (reflux ratio 200%) for the same reaction. The COD concentration of the effluent from the short-cut denitrification-anaerobic ammonia oxidation tank is 150 mg / L, the BOD concentration is 50 mg / L, the ammonia nitrogen concentration is 150 mg / L, and the total nitrogen concentration is 260 mg / L. The nitrite nitrogen concentration is 90 mg / L, and the nitrate nitrogen concentration is 10 mg / L. The effluent is fed into the short-cut denitrification-anaerobic ammonia oxidation tank, the dissolved oxygen is 0.5 mg / L, and the temperature is 35°C. The aerobic ammonia oxidizing bacteria convert part of the ammonia nitrogen into nitrite using the dissolved oxygen. At the same time, the anaerobic ammonia oxidizing bacteria use ammonia nitrogen and nitrite to produce nitrogen gas and a small amount of nitrate. The COD concentration of the effluent is 138 mg / L, the BOD concentration is 20 mg / L, the ammonia nitrogen concentration is 60 mg / L, the nitrite concentration is 80 mg / L, the nitrate concentration is 34 mg / L, and the total nitrogen concentration is 180 mg / L. Then, the effluent is fed into the denitrification swing tank. The nitrite / ammonia nitrogen concentration ratio is 1.38 at this time. The dissolved oxygen in the tank is 0.2 mg / L, and the temperature is 35°C. At this time, the air is mainly used for mixing. The anaerobic ammonia oxidizing bacteria continuously convert nitrite and ammonia into nitrogen gas. The COD concentration of the effluent is 120 mg / L, the BOD concentration is 15 mg / L, the ammonia nitrogen concentration is 10 mg / L, the nitrite concentration is 40 mg / L, the nitrate concentration is 87 mg / L, and the total nitrogen concentration is 139 mg / L. The next stage is the separation of sludge and water in the intermediate sedimentation tank. The sludge is fed back into the short-cut denitrification-anaerobic ammonia oxidation tank through the reflux system 3 (reflux ratio 40%). In the DN tank, 15% of the raw water is supplemented. The BOD in the raw water converts all the nitrate / nitrite in the effluent from the denitrification swing tank into nitrogen gas. The ammonia nitrogen carried by the raw water and the ammonia nitrogen from the denitrification swing tank are all fed into the nitrification carbon removal tank. At this time, the nitrification carbon removal tank converts all the ammonia nitrogen into nitrate through the nitrification process. All the effluent is fed into the denitrification tank through the reflux system 3 (reflux ratio 200%) for denitrification removal. The effluent is fed into the final sedimentation tank for sedimentation. The sludge is fed back into the denitrification tank through the reflux system 3 (reflux ratio 80%) to ensure that the COD concentration of the effluent is 100 mg / L, the BOD concentration is 15 mg / L, the ammonia nitrogen concentration is 8 mg / L, the nitrite concentration is 0 mg / L, the nitrate concentration is 23 mg / L, and the total nitrogen concentration is 35 mg / L.

[0060] Example 2

[0061] Treatment object: high-organic high-ammonia wastewater (COD concentration of 5000 mg / L, BOD concentration of 4800 mg / L, ammonia nitrogen concentration of 900 mg / L, total nitrogen concentration of 1000 mg / L, BOD / TN = 4.8);

[0062] Process: First, 95% of the wastewater is fed into the anaerobic IC reactor for methanation treatment. The effluent COD concentration is 250 mg / L, BOD concentration is 200 mg / L, ammonia nitrogen concentration is 1000 mg / L due to amination, and total nitrogen concentration is 1000 mg / L. At this time, the IC effluent is fed into the short-cut denitrification-anaerobic ammonia oxidation tank together with the water from the first reflux system (reflux ratio 200%) of the intermediate sedimentation tank. The COD of the IC effluent converts nitrate in the reflux liquid into nitrite. Since the COD of the IC effluent is insufficient, 5% of the raw water is fed into the PD to supplement the carbon source for short-cut denitrification. The effluent from the denitrification swing tank is also fed into the short-cut nitrification-anaerobic ammonia oxidation tank through the second reflux system (reflux ratio 200%) for the same reaction. The COD concentration of the effluent from the short-cut denitrification-anaerobic ammonia oxidation tank is 100 mg / L, BOD concentration is 60 mg / L, ammonia nitrogen concentration is 100 mg / L, total nitrogen concentration is 150 mg / L, nitrite nitrogen is 40 mg / L, and nitrate nitrogen is 8 mg / L. The effluent is fed into the short-cut nitrification-anaerobic ammonia oxidation tank, with dissolved oxygen of 0.5 mg / L and temperature of 35°C. The aerobic ammonia oxidation bacteria utilize dissolved oxygen to convert part of the ammonia nitrogen into nitrite, while the anaerobic ammonia oxidation bacteria utilize ammonia nitrogen and nitrite to produce nitrogen gas and a small amount of nitrate. The effluent COD concentration is 98 mg / L, BOD concentration is 21 mg / L, ammonia nitrogen concentration is 45 mg / L, nitrite concentration is 30 mg / L, nitrate concentration is 30 mg / L, and total nitrogen concentration is 120 mg / L. Then, the effluent is fed into the denitrification swing tank. The nitrite / ammonia nitrogen concentration ratio is 0.67. At this time, the dissolved oxygen in the tank is 0.8 mg / L and the temperature is 35°C. On one hand, the nitritation bacteria and anaerobic ammonia oxidation bacteria continue to reduce the ammonia nitrogen and nitrite in the influent. On the other hand, the nitrification process is fully utilized to reduce ammonia nitrogen. The effluent COD concentration is 90 mg / L, BOD concentration is 18 mg / L, ammonia nitrogen concentration is 20 mg / L, nitrite concentration is 15 mg / L, nitrate concentration is 39 mg / L, and total nitrogen concentration is 78 mg / L.The next stage enters the intermediate sedimentation tank sludge water separation, the sludge is backflowed to the short-range denitrification-anaerobic ammonia oxidation tank through the backflow system 3 (backflow ratio 40%); because the BOD / TN in the raw water is 3.8, additional organic carbon source is supplemented in the DN tank, and all the nitrate / nitrite in the effluent of the denitrification swing tank is converted into nitrogen gas, the COD concentration of the effluent is 110 mg / L, the BOD concentration is 20 mg / L, the ammonia nitrogen concentration is 20 mg / L, the nitrite concentration is 2 mg / L, the nitrate concentration is 3 mg / L, and the total nitrogen concentration is 30 mg / L; the remaining ammonia nitrogen in the denitrification swing tank is all fed into the nitrification carbon removal tank; at this time, the nitrification carbon removal tank uses the nitrification process to convert all the ammonia nitrogen into nitrate, which is all fed into the denitrification tank for denitrification removal through the backflow system 3 (backflow ratio 200%), and the effluent is fed into the final sedimentation tank for sedimentation, and the sludge is backflowed to the denitrification tank through the backflow system 3 (backflow ratio 80%), so as to ensure that the COD concentration of the effluent is 80 mg / L, the BOD concentration is 10 mg / L, the ammonia nitrogen concentration is 5 mg / L, the nitrite concentration is 0 mg / L, the nitrate concentration is 13 mg / L, and the total nitrogen concentration is 23 mg / L.

[0063] The above only describes the preferred embodiments of the present application, and does not limit the present application in any form. It should be noted that, for ordinary skilled persons in the art, some improvements and refinements can be made without departing from the principles of the present application, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A complete process treatment device for wastewater with high organic matter and high ammonia content, characterized in that, The system consists of a series of interconnected components: an anaerobic tower, a short-cut denitrification-anaerobic ammonium oxidation tank, a nitrification-anaerobic ammonium oxidation tank, a denitrification swing tank, an intermediate sedimentation tank, a denitrification tank, a nitrification and carbon removal tank, and a final sedimentation tank. The dissolved oxygen concentration in the denitrification swing tank is 0~1.5 mg / L; When the nitrite to ammonia nitrogen ratio in the effluent of the nitrification-anaerobic ammonia oxidation tank is 1~1.2, the dissolved oxygen in the denitrification swing tank is 0.1~0.2 mg / L; When the nitrite to ammonia nitrogen ratio in the effluent of the nitrification-anaerobic ammonia oxidation tank is less than 1, the dissolved oxygen in the denitrification swing tank is 0.2~1.5 mg / L; The nitrification-anaerobic ammonium oxidation tank is also connected to the short-cut denitrification-anaerobic ammonium oxidation tank through a first reflux system. The denitrification swing tank is also connected to the short-cut denitrification-anaerobic ammonium oxidation tank via a second reflux system; The nitrification and decarbonization tank is also connected to the denitrification tank via a third reflux system; The intermediate sedimentation tank is also connected to the short-cut denitrification-anaerobic ammonium oxidation tank via a fourth reflux system; The final settling tank is also connected to the denitrification tank via a fifth reflux system.

2. The apparatus for treating high organic and high ammonia wastewater according to claim 1, wherein The anaerobic tower is an anaerobic internal circulation reactor, an anaerobic upflow sludge bed reactor, or an anaerobic membrane reactor. The COD load of the anaerobic tower is 5-15 kg / (m 3 ·d).

3. The apparatus for treating high organic and high ammonia wastewater according to claim 1, wherein Biological packing materials are provided in the short-cut denitrification-anaerobic ammonium oxidation tank, the nitrite-anaerobic ammonium oxidation tank, and the denitrification swing tank. The biological packing material can be a moving packing material or a fixed packing material. When the biological packing material is a moving packing material, the filling ratio of the biological packing material is 20-40%. When the biological packing material is a fixed packing material, the packing spacing of the biological packing material is 150-300 mm.

4. The apparatus for treating high organic and high ammonia wastewater according to claim 1, wherein Both the short-cut denitrification-anaerobic ammonium oxidation tank and the denitrification tank are equipped with stirring devices; The bottom of the nitrification-anaerobic ammonia oxidation tank, the denitrification swing tank, and the nitrification carbon removal tank are all equipped with an aeration system; the top of the nitrification-anaerobic ammonia oxidation tank, the denitrification swing tank, and the nitrification carbon removal tank are all equipped with a gas collection system.

5. A method for treating high-organic and high-ammonia wastewater by using the full-process treatment device according to any one of claims 1-4, characterized in that, Includes the following steps: High-organic-and-ammonia-rich wastewater is sequentially passed through an anaerobic tower, a short-cut denitrification-anaerobic ammonia oxidation tank, a nitrification-anaerobic ammonia oxidation tank, a denitrification swing tank, an intermediate sedimentation tank, a denitrification tank, a nitrification and carbon removal tank, and a final sedimentation tank to undergo anaerobic methanation treatment of organic matter, short-cut denitrification-anaerobic ammonia oxidation denitrification, nitrification-anaerobic ammonia oxidation denitrification, denitrification, sedimentation, denitrification, nitrification and carbon removal, and final sedimentation to obtain recycled water; The COD concentration in the high organic and high ammonia wastewater is 5000~20000 mg / L, the BOD concentration is 4000~8000 mg / L, the ammonia nitrogen is 300~2000 mg / L, and the total nitrogen is 400~2000 mg / L.

6. The method as described in claim 5, characterized in that, The dissolved oxygen concentration in the nitrification-anaerobic ammonia oxidation tank is 0.5~1.5 mg / L, and the dissolved oxygen concentration in the nitrification carbon removal tank is 2~3 mg / L; The dissolved oxygen concentration in the anaerobic tower, short-cut denitrification-anaerobic ammonia oxidation tank, intermediate sedimentation tank, denitrification tank, and final sedimentation tank is ≤0.1mg / L.

7. The method as described in claim 6, characterized in that, The suspended sludge concentration after the short-cut denitrification-anaerobic ammonium oxidation tank, nitrite-anaerobic ammonium oxidation tank, and denitrification swing tank have been stably operated is ≤1000mg / L.

8. The method as described in claim 5, characterized in that, When the BOD / TN in the high organic and high ammonia wastewater is greater than 5, the high organic and high ammonia wastewater, in addition to entering the anaerobic tower for anaerobic treatment, also enters the denitrification-anaerobic ammonia oxidation tank and the denitrification tank as a supplementary source of organic carbon. When the BOB / TN ratio in the high-organic-ammonia wastewater is less than 5, an additional carbon source should be added.

Images