Methylamine wastewater treatment device and method

Abstract

The invention provides a device and a method for treating methylamine wastewater. The method comprises the following steps: collecting wastewater by adopting a comprehensive regulating tank, carrying out homogenization, homogenization and pH regulation treatment, pumping the treated wastewater into a hydrolysis acidification tank, and degrading COD (Chemical Oxygen Demand) in the wastewater; the two-stage AO activated sludge tank is used for metabolism, nitrification and denitrification of microorganisms; the treated wastewater is subjected to mud-water separation through a secondary sedimentation tank, supernate enters a clear water tank for up-to-standard discharge when the indexes are normal, the supernate is sent to a Fenton reaction tank when the indexes are abnormal, and oxidation reaction is carried out through a Fenton reagent in the Fenton reaction tank; carrying out mud-water separation on the wastewater subjected to the oxidation reaction through a tertiary sedimentation tank, discharging supernate into a denitrification biological aerated filter, carrying out denitrification treatment, and carrying out organic matter degradation on the wastewater subjected to denitrification treatment by adopting a carbon removal biological aerated filter. According to the invention, indexes such as organic pollutants, ammonia nitrogen, total nitrogen and the like of final discharged water can stably reach the standard, continuous and efficient wastewater treatment is realized, and the cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to a device and method for treating methylamine wastewater. Background Art

[0002] Methylamine is a hydrocarbon derivative of ammonia and a fatty amine. It is a series of products with different structures (monomethylamine, dimethylamine and trimethylamine) produced by pressurized distillation under catalytic conditions using liquid nitrogen and methanol as raw materials. The main pollutants in methylamine wastewater are toxic pollutants such as ammonia nitrogen and methanol, as well as some organic substances such as mixed methylamine. Methylamine production wastewater has the characteristics of complex composition, high pollutant concentration, high toxicity, high ammonia nitrogen content, serious imbalance in carbon-nitrogen ratio, poor biodegradability, and generally difficult to carry out biological treatment.

[0003] At present, the main methods for treating high total ammonia and ammonia nitrogen methylamine wastewater are physical and chemical methods and biological methods. The physical and chemical methods mainly include air stripping, precipitation, ion exchange, breakpoint chlorination, electrodialysis, catalytic wet oxidation, etc., but the operating cost is high, so it is rarely used; the biological method uses microorganisms to convert organic nitrogen and ammonia nitrogen in wastewater into nitrogen gas through the nitrification-denitrification process. The operating cost is low, but the domestication process of microorganisms is difficult and easily affected by temperature and toxic substances. The commonly used processes are mainly anaerobic + anoxic + aerobic.

[0004] However, the existing physical and chemical methods and biological methods cannot be used for continuous and efficient treatment, and the cost and operating expenses are high, which cannot meet the actual needs. Therefore, there is an urgent need for a methylamine wastewater treatment method that can continuously and efficiently treat wastewater and save investment and operating costs. Summary of the invention

[0005] Based on this, it is necessary to provide a methylamine wastewater treatment device and method to address the above technical problems.

[0006] A methylamine wastewater treatment device comprises: a comprehensive regulating tank, a hydrolysis acidification tank, a two-stage AO activated sludge tank, a secondary sedimentation tank, a Fenton reaction tank, a tertiary sedimentation tank, a denitrification aerated biological filter, a carbon removal aerated biological filter and a clear water tank; the comprehensive regulating tank is used to collect wastewater, homogenize and equalize the amount, and adjust the pH value, and pump the treated wastewater into the hydrolysis acidification tank; the hydrolysis acidification tank is used to degrade COD in the wastewater and convert organic nitrogen and ammonia in the wastewater into ammonia nitrogen; the two-stage AO activated sludge tank is connected to the hydrolysis acidification tank, including a primary AO activated sludge tank and a secondary AO activated sludge tank, and is used to carry out microbial metabolism, nitrification and denitrification of the degraded wastewater, and remove total nitrogen substances and CO in the wastewater. D; the secondary sedimentation tank is connected with the two-stage AO activated sludge tank, and is used for separating the treated wastewater from mud and water. When the supernatant index is normal, it enters the clear water tank for discharge in compliance with the standard, and when the supernatant index is abnormal, it is sent to the Fenton reaction tank; the Fenton reaction tank is connected with the tertiary sedimentation tank, and is used for adding Fenton reagent to the supernatant with abnormal index, performing oxidation reaction, and removing part of COD; the tertiary sedimentation tank is used for separating the wastewater from mud and water after the oxidation reaction, and the supernatant is discharged to the denitrifying aerated biological filter; the denitrifying aerated biological filter is used for denitrifying the separated supernatant; the decarbonization aerated biological filter is connected with the denitrifying aerated biological filter, and is used for degrading organic matter in the wastewater after denitrification treatment.

[0007] In one embodiment, a buffer tank is provided between the denitrifying aerated biological filter and the three sedimentation tanks for buffering the precipitated supernatant; an intermediate water tank is provided between the denitrifying aerated biological filter and the carbon removal aerated biological filter, and the intermediate water tank is used to pump the supernatant after denitrification into the carbon removal aerated biological filter.

[0008] In one of the embodiments, the primary AO activated sludge tank and the secondary AO activated sludge tank are both provided with a nitrification liquid reflux pipe and a carbon source inlet.

[0009] In one of the embodiments, the denitrifying aerated biological filter and the carbon removal aerated biological filter are both provided with a backwash water pipe and a backwash wastewater pipe. The backwash water pipe is connected to the clean water tank to inject clean water into the denitrifying aerated biological filter and the carbon removal aerated biological filter; the backwash wastewater pipe is used to transport the wastewater generated after flushing to the comprehensive regulating tank for further treatment.

[0010] In one embodiment, it also includes a sludge thickening tank, which is connected to the hydrolysis acidification tank, the secondary sedimentation tank and the tertiary sedimentation tank, and is used to treat the generated sludge, concentrate the sludge, and transport it to the dehydration room for dehydration treatment.

[0011] In one of the embodiments, an accident pool is further included, which is connected to the comprehensive regulating pool and is used to store the clear water pool wastewater and methylamine wastewater under abnormal circumstances, and transport them to the comprehensive regulating pool for wastewater treatment.

[0012] A method for treating methylamine wastewater, using the above-mentioned methylamine wastewater treatment device, comprises the following steps: collecting wastewater through a comprehensive regulating tank, homogenizing and balancing the wastewater, adjusting the pH, and pumping the treated wastewater into a hydrolysis acidification tank; degrading COD in the wastewater through the hydrolysis acidification tank, and converting organic nitrogen and ammonia in the wastewater into ammonia nitrogen; using a two-stage AO activated sludge tank to perform microbial metabolism treatment and nitrification and denitrification on the wastewater, and removing total nitrogen substances and COD in the wastewater; and separating the treated wastewater into a secondary sedimentation tank. The wastewater is separated from the wastewater, and the supernatant is discharged in compliance with the standards when the indicators are normal, and is sent to the Fenton reaction tank when the indicators are abnormal; Fenton reagent is added to the supernatant with abnormal indicators through the Fenton reaction tank to carry out oxidation reaction and remove part of COD; the wastewater after the oxidation reaction is separated from the wastewater through three sedimentation tanks, and the supernatant is sent to the denitrification aerated biological filter; the separated supernatant is denitrified through the denitrification aerated biological filter, and the organic matter in the wastewater after denitrification treatment is degraded through the decarbonization aerated biological filter.

[0013] Compared with the prior art, the advantages and beneficial effects of the present invention are: high total nitrogen, ammonia nitrogen and methylamine wastewater is treated through a comprehensive regulating tank, hydrolysis acidification, two-stage AO activated sludge tank, secondary sedimentation tank, Fenton reaction tank, tertiary sedimentation tank, denitrification aerated biological filter, carbon removal aerated biological filter and clear water tank process; hydrolysis acidification replaces the conventional anaerobic system to reduce the consumption of front-end carbon source and the dosage of rear-end carbon source; the Fenton system is set at the rear end as deep treatment, which produces less sludge and less reagent consumption than the pretreatment set at the front end; deep treatment is set as a safeguard measure to ensure that indicators such as organic pollutants, ammonia nitrogen, total nitrogen and the like after wastewater treatment are stably up to standard. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The figure is a schematic diagram of the structure of a methylamine wastewater treatment device in one embodiment.

[0015] Figure 2 The figure is a schematic flow chart of a method for treating methylamine wastewater in one embodiment. DETAILED DESCRIPTION

[0016] Before describing the specific embodiments of the present invention, the overall concept of the present invention is described as follows:

[0017] The present invention is mainly developed for wastewater treatment process. At present, in the process of treating wastewater with high total nitrogen and ammonia nitrogen, methylamine, anaerobic system is often used, which leads to large consumption of carbon source at the front end and increased carbon source supplement at the back end. At the same time, Fenton system is used in the pretreatment stage, which leads to increased sludge amount and dosage of reagents.

[0018] Therefore, the present invention proposes a treatment device and method for methylamine wastewater, which adopts a new process route, through the treatment of a comprehensive regulating tank, hydrolysis acidification, a two-stage AO activated sludge tank, a secondary sedimentation tank, a Fenton reaction tank, a tertiary sedimentation tank, a denitrification aerated biological filter, a carbon removal aerated biological filter and a clear water tank, which can effectively reduce the addition of chemicals and sludge generation, and continuously and efficiently treat high total nitrogen and ammonia nitrogen methylamine wastewater.

[0019] After introducing the overall concept of the present invention, in order to make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail by specific implementation methods in combination with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0020] In one embodiment, Figure 1 As shown, a methylamine wastewater treatment device is provided, comprising: a comprehensive regulating tank 10, a hydrolysis acidification tank 20, a two-stage AO activated sludge tank 30, a secondary sedimentation tank 40, a Fenton reaction tank 50, a tertiary sedimentation tank 60, a denitrification aerated biological filter 70, a carbon removal aerated biological filter 80 and a clear water tank 90; the comprehensive regulating tank 10 is used to collect wastewater and homogenize and equalize the amount, perform pH adjustment, and pump the treated wastewater into the hydrolysis acidification tank 20; the hydrolysis acidification tank 20 is used to degrade COD in the wastewater and convert organic nitrogen and ammonia in the wastewater into ammonia nitrogen; the two-stage AO activated sludge tank 30 is connected to the hydrolysis acidification tank 20, including a primary AO activated sludge tank 31 and a secondary AO activated sludge tank 32, which are used for microbial metabolism, nitrification and denitrification of the degraded wastewater , remove total nitrogen substances and COD in the wastewater; the secondary sedimentation tank 40 is connected to the two-stage AO activated sludge tank 30, and is used to separate the treated wastewater from mud and water. When the supernatant index is normal, it enters the clear water tank 90 for discharge up to standard, and when the supernatant index is abnormal, it is sent to the Fenton reaction tank 50; the Fenton reaction tank 50 is connected to the tertiary sedimentation tank 60, and is used to add Fenton reagent to the supernatant with abnormal index, perform oxidation reaction, and remove part of COD; the tertiary sedimentation tank 60 is used to separate the wastewater from mud and water after the oxidation reaction, and the supernatant is discharged to the denitrification aerated biological filter 70; the denitrification aerated biological filter 70 is used to denitrify the separated supernatant; the carbon removal aerated biological filter 80 is connected to the denitrification aerated biological filter 70, and is used to degrade organic matter in the wastewater after denitrification treatment.

[0021] In this embodiment, a comprehensive regulating tank 10 is used to collect wastewater, and homogenization, equalization and pH adjustment treatment are performed. The treated wastewater is pumped into a hydrolysis acidification tank 20, and the COD in the wastewater is degraded by the hydrolysis acidification tank 20, and the organic nitrogen ammonia in the wastewater is converted into ammonia nitrogen, thereby improving the biodegradability of the wastewater; the two-stage AO activated sludge tank 30 includes a primary AO activated sludge tank 31 and a secondary activated sludge tank 32, which perform microbial metabolism, nitrification and denitrification to remove total nitrogen substances and COD in the wastewater; the treated wastewater is separated from mud and water by a secondary sedimentation tank 40, and when the supernatant index is normal, it is discharged into a clear water tank 90 to meet the discharge standards, and the supernatant index is 0. When the standard is abnormal, it is sent to the Fenton reaction tank 50, and the Fenton reagent in the Fenton reaction tank 50 is used for oxidation reaction to remove part of the organic matter, thereby improving the biodegradability of the wastewater again; the wastewater after the oxidation reaction is separated into mud and water through the three sedimentation tanks 60, and the supernatant is discharged to the denitrification aerated biological filter 70; the separated supernatant is denitrified by the denitrification aerated biological filter 70, so that the total nitrogen and ammonia nitrogen in the final drainage can stably meet the discharge requirements, and the decarbonization aerated biological filter is used to degrade the organic matter in the wastewater after denitrification treatment, so as to ensure that the organic pollution index of the final drainage can stably meet the standard, so as to achieve continuous and efficient wastewater treatment and reduce the cost.

[0022] The present invention adopts the process flow of "collection + comprehensive regulating tank + hydrolysis and acidification + primary AO activated sludge tank + secondary AO activated sludge tank + secondary sedimentation tank + Fenton reaction tank + tertiary sedimentation tank + denitrification aerated biological filter + carbon removal aerated biological filter + clear water tank". The function of the comprehensive regulating tank 10 is to collect wastewater and homogenize and equalize the amount. The function of the hydrolysis and acidification tank 20 is to remove COD in the wastewater, improve the biodegradability of the wastewater, reduce the toxicity of the wastewater, and ammonify the organic nitrogen into ammonia nitrogen. The function of the two-stage AO activated sludge tank 30 is to remove total nitrogen and COD in the wastewater. The function of the secondary sedimentation tank 40 is to separate mud and water. When the supernatant index is normal, it enters the clear water tank and meets the discharge standards. The sludge can be refluxed or dehydrated. The Fenton reaction tank 50, the denitrification aerated biological filter 70 and the carbon removal aerated biological filter 80 are safeguard measures. Among them, the function of the Fenton reaction tank 50 is to remove some organic matter, open the ring and break the chain of difficult-to-degrade large molecular organic matter, and further improve the biodegradability of the wastewater. The function of the three sedimentation tanks 60 is to separate mud and water. The functions of the denitrification aerated biological filter 70 and the carbon removal aerated biological filter 80 are to remove total nitrogen and COD in the wastewater to ensure that the final drainage organic pollutants, ammonia nitrogen, total nitrogen and other indicators are stable and meet the standards.

[0023] Among them, a buffer tank 65 is arranged between the denitrifying aerated biological filter 70 and the three sedimentation tanks 60 for buffering the precipitated supernatant; an intermediate water tank 75 is arranged between the denitrifying aerated biological filter 70 and the carbon removal aerated biological filter 80 for pumping the supernatant after denitrification into the carbon removal aerated biological filter 80.

[0024] Specifically, a buffer tank 65 is provided between the denitrifying aerated biological filter 70 and the three sedimentation tanks 60 for buffering the precipitated supernatant. The buffer tank 65 pumps the supernatant into the denitrifying aerated biological filter 70 for denitrification treatment. An intermediate water tank 75 is provided between the denitrifying aerated biological filter 70 and the carbon removal aerated biological filter 80. The intermediate water tank is used to store the wastewater after the denitrification treatment and pump it into the carbon removal aerated biological filter for organic matter removal.

[0025] The primary AO activated sludge tank 31 and the secondary AO activated sludge tank 32 are both provided with a nitrification liquid reflux pipe and a carbon source inlet, which are used for reflux and reuse of the nitrification liquid and for injecting the carbon source into the sludge tank, respectively.

[0026] Specifically, the first-stage AO activated sludge tank 31 and the second-stage AO activated sludge tank 32 are both provided with a nitrification liquid reflux pipe and a carbon source inlet. The nitrification liquid reflux is realized through the nitrification liquid reflux pipe and is reused. The carbon source is injected into the two-stage AO activated sludge tank 30 through the carbon source inlet for treating the sludge.

[0027] Among them, the denitrifying aerated biological filter 70 and the carbon removal aerated biological filter 80 are both provided with backwashing water pipes and backwashing wastewater pipes; the backwashing water pipes are connected to the clean water tank 90 to inject clean water into the denitrifying aerated biological filter and the carbon removal aerated biological filter 80; the backwashing wastewater pipe is used to transport the wastewater generated after flushing to the comprehensive regulating tank 10 for further treatment.

[0028] Specifically, the denitrifying aerated biological filter 70 and the carbon removal aerated biological filter 80 are both provided with a backwash water pipe and a backwash wastewater pipe. The backwash water pipe is connected to the clean water tank 90. ​​Clean water is injected into the denitrifying aerated biological filter 70 and the carbon removal aerated biological filter 80 through the clean water tank 90 and the backwash water pipe for flushing; and the wastewater generated by flushing is transported to the comprehensive regulating tank 10 through the backwash wastewater pipe for further treatment, so that the wastewater can be fully treated.

[0029] The sludge concentration tank 21 is also included. The sludge concentration tank 21 is connected with the hydrolysis acidification tank 20, the secondary sedimentation tank 40 and the tertiary sedimentation tank 60, and is used to treat the generated sludge, concentrate the sludge, and transport it to the dehydration room for dehydration treatment.

[0030] Specifically, the treatment device also includes a sludge thickening tank 21, which is connected to the hydrolysis acidification tank 20, the secondary sedimentation tank 40 and the tertiary sedimentation tank 60 respectively, and is used to treat the sludge generated by the hydrolysis acidification tank 20, as well as the remaining sludge in the secondary sedimentation tank 40 and the tertiary sedimentation tank 60, to concentrate the sludge, and transport it to the dehydration room for dehydration treatment. The sludge after dehydration treatment can be outsourced for sludge treatment.

[0031] It also includes an accident pool 11, which is connected to the comprehensive regulating pool 10 and is used to store wastewater and methylamine wastewater from the clear water pool under abnormal circumstances, and transport them to the comprehensive regulating pool 10 for wastewater treatment.

[0032] Specifically, the treatment device also includes an accident pool 11, which is connected to the comprehensive regulating pool 10. When the indicators of methylamine wastewater and clean water pool wastewater are abnormal, they can be first stored in the accident pool 11 and finally transported to the comprehensive regulating pool 10 for wastewater treatment.

[0033] In one embodiment, Figure 2 As shown, a method for treating methylamine wastewater is provided, comprising the following steps:

[0034] Step S201, collecting wastewater through a comprehensive regulating tank, homogenizing and balancing the wastewater, adjusting the pH, and pumping the treated wastewater into a hydrolysis acidification tank.

[0035] Specifically, the methylamine wastewater is input into a comprehensive regulating tank, and the wastewater is treated with homogenization and equalization, wherein homogenization refers to the equalization of water quality, and equalization refers to the equalization of water volume, to avoid the impact of water quality fluctuations on subsequent systems, and the pH of the wastewater is adjusted. The treated wastewater is pumped into a hydrolysis acidification tank.

[0036] Step S202, reducing the COD in the wastewater through a hydrolysis acidification tank, and converting the organic nitrogen ammonia in the wastewater into ammonia nitrogen.

[0037] Specifically, the hydrolysis acidification tank utilizes the action of hydrolytic bacteria to degrade part of the COD (Chemical Oxygen Demand) in the wastewater, destroys the cyclic and long-chain organic matter in the wastewater, improves the biodegradability of the wastewater, reduces the toxicity of the wastewater, and converts part of the organic nitrogen and ammonia in the wastewater into ammonia nitrogen.

[0038] Step S203, using a two-stage AO activated sludge tank to perform microbial metabolism, nitrification and denitrification on the wastewater to remove total nitrogen substances and COD in the wastewater.

[0039] Specifically, the wastewater is treated by microbial metabolism, nitrification and denitrification through two-stage AO activated sludge tanks. The primary A tank is mainly used to reduce the original NO3- in the sewage and the NO3- returned from the primary O tank to the A tank through reflux control into molecular nitrogen (N2), so as to achieve the purpose of removing TN; under the condition of sufficient oxygen supply, the nitrification of the autotrophic bacteria in the primary O tank converts NH3 and NH4 + Oxidized to NO3-, removing CODcr and NH4 +The purpose of the first-stage O pool is to have a nitrification liquid reflux pump, which returns to the first-stage A pool through reflux control; the two-stage AO is operated in series, and the second-stage A pool is mainly used to transfer the residual NO3 - Reduced to molecular nitrogen (N2), to achieve the purpose of removing the remaining TN, the secondary O pool is mainly used to degrade the added excess carbon source, so as to achieve the effect of removing total nitrogen substances and part of COD in the wastewater.

[0040] Step S204, the treated wastewater is separated into mud and water through the secondary sedimentation tank, and the supernatant is discharged when the index is normal and meets the standard, and is sent to the Fenton reaction tank when the index is abnormal.

[0041] Specifically, the secondary sedimentation tank is used to separate the wastewater treated in the two-stage AO activated sludge tank from mud and water. When the supernatant index is normal, it enters the clear water tank and can be discharged in compliance with the standards. When the supernatant index is abnormal, it is sent to the Fenton reaction tank. The precipitated sludge can be returned to the two-stage AO activated sludge tank for further treatment, or transported to the sludge thickening tank for sludge thickening treatment.

[0042] Step S205, adding Fenton reagent to the supernatant with abnormal indicators through a Fenton reaction tank to perform an oxidation reaction to remove part of the COD.

[0043] Specifically, the supernatant with abnormal indicators separated from the sedimentation tank is transported to the Fenton reaction tank, and an oxidation reaction occurs through the Fenton agent to remove some organic matter. At the same time, the macromolecular organic matter in the wastewater can be opened and chain broken, thereby improving the biodegradability of the wastewater, reducing the toxicity of the wastewater, and removing some COD.

[0044] Step S206, the wastewater after the oxidation reaction is separated into mud and water by three sedimentation tanks, and the supernatant is transported to the denitrification aerated biological filter.

[0045] Specifically, after the wastewater undergoes oxidation reaction, it is passed through three sedimentation tanks for mud and water separation, wherein the supernatant is transported to a denitrifying aerated biological filter tank, and the sludge can be transported to a sludge thickening tank for sludge thickening treatment.

[0046] Step S207, denitrifying the separated supernatant by a denitrifying biological aerated filter, and degrading organic matter in the denitrified wastewater by a decarbonizing biological aerated filter.

[0047] Specifically, a denitrifying aerated biological filter is used to oxidize the nitrogen-containing pollutants in the front-end advanced oxidation into nitrate nitrogen and denitrify them into nitrogen gas to achieve the purpose of denitrification, so that the total nitrogen in the final drainage can stably meet the emission requirements. After the difficult-to-degrade organic matter is oxidized into easily degradable organic matter in the front-end oxidation process, it can be further fully degraded through a carbon removal aerated biological filter to ensure that the final drainage COD, BOD (Biochemical oxygen demand, chemical oxygen demand) and other organic pollutant indicators are stably up to standard.

[0048] In this embodiment, wastewater is collected through a comprehensive regulating tank and subjected to homogenization, equalization and pH adjustment treatment. The treated wastewater is pumped into a hydrolysis acidification tank to degrade COD in the wastewater and convert organic nitrogen and ammonia in the wastewater into ammonia nitrogen. A two-stage AO activated sludge tank is used to treat the wastewater with microbial metabolism and nitrification and denitrification to remove total nitrogen substances and COD in the wastewater. The wastewater is separated into mud and water through a secondary sedimentation tank. When the supernatant index is normal, the liquid meets the discharge standard. When the supernatant index is abnormal, it is sent to a Fenton reaction tank, and an oxidation reaction is performed by adding a Fenton agent to remove part of CO. D. The wastewater after the oxidation reaction is separated from the mud and water through three sedimentation tanks, and the supernatant is transported to the denitrification aerated biological filter for denitrification treatment. The carbon removal aerated biological filter is used for organic matter degradation. The conventional anaerobic system is replaced by hydrolysis acidification, thereby reducing the consumption of the front-end carbon source and the dosage of the back-end carbon source. The Fenton agent is set to be added at the back end as a deep treatment. Compared with the pretreatment set at the front end, the amount of sludge generated is less and the agent consumption is less. At the same time, the carbon removal aerated biological filter is set for deep treatment as a safeguard measure to ensure that the various indicators of the treated wastewater can stably meet the standards.

[0049] The above contents are further detailed descriptions of the present invention in combination with specific implementation methods, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the scope of protection of the present invention.

Claims

1. A methylamine wastewater treatment device, characterized in that: include: Comprehensive regulating tank, hydrolysis acidification tank, two-stage AO activated sludge tank, secondary sedimentation tank, Fenton reaction tank, tertiary sedimentation tank, denitrification aerated biological filter, carbon removal aerated biological filter and clear water tank; The comprehensive regulating tank is used to collect wastewater, homogenize and equalize the amount, adjust the pH, and pump the treated wastewater into the hydrolysis acidification tank; The hydrolysis acidification tank is used to degrade COD in the wastewater and convert organic nitrogen and ammonia in the wastewater into ammonia nitrogen; The two-stage AO activated sludge tank is connected to the hydrolysis acidification tank, and includes a primary AO activated sludge tank and a secondary AO activated sludge tank, which are used for microbial metabolism, nitrification and denitrification of the degraded wastewater to remove total nitrogen substances and COD in the wastewater; The secondary sedimentation tank is connected to the two-stage AO activated sludge tank, and is used to separate the treated wastewater into mud and water. When the supernatant index is normal, it enters the clean water tank for discharge up to the standard, and when the supernatant index is abnormal, it is sent to the Fenton reaction tank; The Fenton reaction tank is connected to the three sedimentation tanks and is used to add Fenton reagent to the supernatant with abnormal indicators to perform oxidation reaction and remove part of COD; The three sedimentation tanks are used to separate the wastewater after the oxidation reaction into mud and water, and the supernatant is discharged into the denitrification aerated biological filter; The denitrifying aerated biological filter is used to denitrify the separated supernatant; The carbon removal aerated biological filter is connected to the denitrification aerated biological filter and is used for degrading organic matter in the wastewater after denitrification treatment.

2. A methylamine wastewater treatment device according to claim 1, characterized in that: A buffer tank is provided between the denitrifying aerated biological filter and the three sedimentation tanks for buffering the precipitated supernatant; an intermediate water tank is provided between the denitrifying aerated biological filter and the carbon removal aerated biological filter for pumping the denitrified supernatant into the carbon removal aerated biological filter.

3. A methylamine wastewater treatment device according to claim 1, characterized in that: The primary AO activated sludge tank and the secondary AO activated sludge tank are both provided with a nitrification liquid reflux pipe and a carbon source inlet.

4. A methylamine wastewater treatment device according to claim 1, characterized in that: The denitrifying aerated biological filter and the carbon removal aerated biological filter are both provided with a backwash water pipe and a backwash wastewater pipe. The backwash water pipe is connected to the clean water tank to inject clean water into the denitrifying aerated biological filter and the carbon removal aerated biological filter; the backwash wastewater pipe is used to transport the wastewater generated after flushing to the comprehensive regulating tank for further treatment.

5. The methylamine wastewater treatment device according to claim 1, characterized in that: It also includes a sludge concentration tank, which is connected to the hydrolysis acidification tank, the second sedimentation tank and the third sedimentation tank, and is used to treat the generated sludge, concentrate the sludge, and transport it to the dehydration room for dehydration treatment.

6. A methylamine wastewater treatment device according to claim 4, characterized in that: It also includes an accident pool, which is connected to the comprehensive regulating pool and is used to store wastewater and methylamine wastewater from the clear water pool under abnormal circumstances, and transport them to the comprehensive regulating pool for wastewater treatment.

7. A method for treating methylamine wastewater, characterized in that: A methylamine wastewater treatment device as claimed in any one of claims 1 to 6 comprises the following steps: Wastewater is collected and homogenized through a comprehensive regulating tank, pH is adjusted, and the treated wastewater is pumped into a hydrolysis acidification tank; The COD in the wastewater is degraded by the hydrolysis acidification tank, and the organic nitrogen and ammonia in the wastewater are converted into ammonia nitrogen; A two-stage AO activated sludge tank is used to treat the wastewater through microbial metabolism, nitrification and denitrification to remove total nitrogen and COD in the wastewater. The treated wastewater is separated into mud and water through the secondary sedimentation tank. When the supernatant index is normal, it is discharged in compliance with the standard. When the supernatant index is abnormal, it is sent to the Fenton reaction tank. Adding Fenton reagent to the supernatant with abnormal indicators through the Fenton reaction pool to perform oxidation reaction and remove part of the COD; The wastewater after oxidation reaction is separated into mud and water through three sedimentation tanks, and the supernatant is transported to the denitrification aerated biological filter; The separated supernatant is denitrified by the denitrification aerated biological filter, and the decarbonization aerated biological filter is used to degrade organic matter in the wastewater after the denitrification.

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