Methylamine-containing wastewater treatment device and method

Abstract

The embodiment of the invention provides a methylamine-containing wastewater treatment device and method, and relates to the technical field of wastewater treatment. The device comprises an anaerobic membrane bioreactor and a filter membrane, the filter membrane is arranged in the anaerobic membrane bioreactor to divide the anaerobic membrane bioreactor into a reaction cavity and a filter cavity, anaerobic activated sludge reacting with methylamine-containing wastewater is arranged in the reaction cavity, a water inlet and an exhaust port are formed in the top of the reaction cavity, and a water outlet is formed in the filter cavity. According to the method, the methylamine-containing wastewater is subjected to anaerobic treatment through the methylamine-containing wastewater treatment device, and anaerobic activated sludge in the anaerobic membrane bioreactor reacts with the methylamine-containing wastewater, so that methylamine in the wastewater is degraded. As the reaction is carried out in an anaerobic environment, oxygen supply aeration equipment is not needed, and the size of equipment adopted in the wastewater treatment process needs to be reduced, so that the energy consumption in the wastewater treatment process is effectively reduced.

Description

Technical Field

[0001] This application relates to the technical field of wastewater treatment, and particularly to a device and method for treating wastewater containing methylamine. Background Art

[0002] The wastewater generated during the production of methylamine contains methylamine. Methylamine itself and its decomposition products may be toxic to aquatic organisms. Especially at high concentrations, it can cause acute toxicity to fish, shellfish, etc., affecting their survival and reproduction. Therefore, for wastewater containing methylamine, effective treatment measures need to be taken to ensure its up-to-standard discharge.

[0003] In the related art, the anoxic-aerobic method is used to treat methylamine wastewater. However, the above treatment process requires a large number of aeration devices to provide oxygen to maintain the life activities of aerobic microorganisms, resulting in relatively large power and oxygen consumption during the wastewater treatment process. Summary of the Invention

[0004] This application provides a device and method for treating wastewater containing methylamine to reduce the energy consumption of treating wastewater containing methylamine.

[0005] In a first aspect, this application provides a device for treating wastewater containing methylamine, including:

[0006] An anaerobic membrane bioreactor:

[0007] A filter membrane, which is arranged in the anaerobic membrane bioreactor to divide the anaerobic membrane bioreactor into a reaction chamber and a filtration chamber. The reaction chamber is used to arrange anaerobic activated sludge that reacts with wastewater containing methylamine. The top of the reaction chamber is provided with a water inlet and an exhaust port, and the filtration chamber is provided with a water outlet.

[0008] In an optional embodiment, the device for treating methylamine wastewater further includes:

[0009] A water inlet assembly, which includes a stirring barrel and a water inlet pipe. One end of the water inlet pipe is connected to the stirring barrel, and the other end is connected to the water inlet. A water inlet pump is arranged on the water inlet pipe, and the water inlet pump is used to introduce the wastewater in the stirring barrel into the reaction chamber;

[0010] A drainage assembly, which includes a drainage pipe and a drainage pump. The drainage pipe is connected to the water outlet; the drainage pump is arranged on the drainage pipe, and the drainage pump is used to discharge the filtered water in the filtration chamber.

[0011] In an optional embodiment, the device for treating methylamine wastewater further includes a gas collection assembly, which includes a gas collection pipe connected to the exhaust port for discharging the gas generated in the reaction chamber.

[0012] In an alternative embodiment, the gas collection assembly further includes:

[0013] An aeration pipeline, one end of the aeration pipeline is connected to the exhaust port, and the other end is connected to the bottom of the reaction chamber;

[0014] An aeration pump, the aeration pump is arranged on the aeration pipeline.

[0015] In an alternative embodiment, the methylamine wastewater treatment device further includes a temperature control assembly, and the temperature control assembly includes:

[0016] A temperature control pipeline, the temperature control pipeline includes a first section and a second section, the first section is arranged in the reaction chamber, and the second section is arranged outside the anaerobic membrane bioreactor;

[0017] A water bath, the water bath is arranged in the second section, and the water bath is used to control the temperature of the fluid medium in the temperature control pipeline.

[0018] In an alternative embodiment, the pore size of the filtration membrane is 0.01 - 0.25 μm, and the area of the filtration membrane is 0.02 - 0.1 m 2 , and / or, the filtration membrane is a flat membrane, a hollow fiber membrane, a tubular membrane or a disc membrane.

[0019] In a second aspect, the present application provides a method for treating methylamine-containing wastewater, using the above-mentioned methylamine-containing wastewater treatment device, including the following steps:

[0020] Introduce the methylamine-containing wastewater into the reaction chamber of the anaerobic membrane bioreactor,

[0021] Mix the methylamine-containing wastewater with the anaerobic activated sludge in the reaction chamber, and the methylamine-containing wastewater and the anaerobic activated sludge carry out an anaerobic digestion reaction to degrade the methylamine in the methylamine-containing wastewater;

[0022] Collect the biogas generated by degrading the methylamine in the methylamine-containing wastewater, and filter the mixed liquid of the wastewater and the anaerobic activated sludge through a filtration membrane to obtain filtered water.

[0023] In an alternative embodiment, the hydraulic retention time for the methylamine-containing wastewater treatment device to treat the methylamine-containing wastewater for the first time is the first hydraulic retention time, and the hydraulic retention time for subsequent treatment of the methylamine-containing wastewater is the second hydraulic retention time, and the second hydraulic retention time is less than or equal to the first hydraulic retention time.

[0024] In an alternative embodiment, the first hydraulic retention time is 30 - 36 h, the second hydraulic retention time decreases periodically, and the period for the second hydraulic retention time to decrease is 25 - 40 days.

[0025] In an alternative embodiment, before introducing the wastewater into the reaction chamber of the anaerobic membrane bioreactor, it further includes: introducing nitrogen aeration into the reaction chamber to maintain an anaerobic environment in the reaction chamber.

[0026] This application provides a methylamine-containing wastewater treatment device and method. The methylamine-containing wastewater treatment device reacts the anaerobic activated sludge in the anaerobic membrane bioreactor with the methylamine-containing wastewater, thereby degrading the methylamine in the wastewater. Since this reaction occurs in an anaerobic environment, oxygen supply aeration equipment is not required, and the volume of the equipment used in the wastewater treatment process needs to be reduced, thereby effectively reducing the energy consumption during the wastewater treatment process. At the same time, in the methylamine-containing wastewater treatment method of this application, the wastewater is treated by an anaerobic membrane bioreactor. Under the action of anaerobic organisms, the organic pollutants in the wastewater can generate methane, a gaseous energy source, reducing greenhouse gas emissions, thereby recycling the wastewater and helping to improve the resource conversion rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings herein are incorporated into the specification and form a part of this specification, showing embodiments consistent with this application, and are used together with the specification to explain the principles of this application.

[0028] Figure 1 It is a schematic structural diagram of the methylamine-containing wastewater treatment device in the embodiment of this application;

[0029] Figure 2 It is a schematic diagram of the organic matter removal rate of the anaerobic membrane bioreactor in the embodiment of this application under different hydraulic retention times;

[0030] Figure 3 It is a schematic diagram of the methane production rate of the anaerobic membrane bioreactor in the embodiment of this application under different hydraulic retention times;

[0031] Figure 4 It is a schematic diagram of the energy consumption and recovery of the anaerobic membrane bioreactor in the embodiment of this application under different hydraulic retention times;

[0032] Figure 5 It is for the anaerobic membrane bioreactor in the embodiment of this application to reduce CO 2 Emission equivalent schematic diagram.

[0033] Reference numerals:

[0034] 100 - Anaerobic membrane bioreactor; 110 - Reaction chamber; 111 - Inlet; 112 - Exhaust port; 120 - Filtration chamber; 121 - Outlet; 130 - Filter membrane;

[0035] 200 - Inlet assembly; 210 - Stirring tank; 220 - Inlet pipe;

[0036] 300 - Drainage assembly; 310 - Drain pipe; 320 - Drainage pump;

[0037] 400 - Gas collection assembly; 410 - Gas collecting pipe; 420 - Gas collection pump; 430 - Aeration pipe; 440 - Aeration pump; 450 - Flowmeter;

[0038] 500 - Temperature control assembly; 510 - Temperature control pipe; 520 - Water bath;

[0039] 600 - Sludge discharge valve.

[0040] Through the above - mentioned drawings, specific embodiments of the present application have been shown, and there will be more detailed descriptions hereinafter. These drawings and written descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. Detailed Description of the Embodiment

[0041] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0042] In the specification and claims of the present application and the above - mentioned drawings, terms such as "first", "second", "third", "fourth", etc. (if any) are used to distinguish similar objects and do not necessarily have to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application described herein, for example, can be implemented in an order other than those illustrated or described herein.

[0043] In the embodiments of the present application, words such as "exemplary" or "for example" are used to represent examples, illustrations, or explanations. Any embodiment or design solution described as "exemplary" or "for example" in the present application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, the use of words such as "exemplary" or "for example" is intended to present relevant concepts in a specific manner.

[0044] It should be noted that the sources of wastewater containing methylamine are relatively diverse, and the components of methylamine wastewater in different chemical plants are different. The wastewater targeted by the present application does not contain macromolecular organic matter, and its main components such as methylamine and methanol are all small - molecule short - carbon - chain organic matters.

[0045] The technical solution of the present application and how the technical solution of the present application solves the above technical problems will be described in detail below with specific embodiments. These several specific embodiments below can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0046] The device for treating methylamine-containing wastewater provided by the embodiments of the present application will be described below. Please refer to Figure 1 , the device includes an anaerobic membrane bioreactor 100 and a filtration membrane 130. The filtration membrane 130 is disposed inside the anaerobic membrane bioreactor 100 to divide the inside of the anaerobic membrane bioreactor 100 into a reaction chamber 110 and a filtration chamber 120. The reaction chamber 110 is used to dispose anaerobic activated sludge that reacts with the methylamine-containing wastewater. An inlet 111 and an exhaust port 112 are provided at the top of the reaction chamber 110, and an outlet 121 is provided in the filtration chamber 120.

[0047] The method for treating methylamine-containing wastewater provided by the embodiments of the present application is realized based on the anaerobic membrane bioreactor 100. The anaerobic membrane bioreactor 100 is a wastewater treatment system that organically combines membrane separation technology and biological treatment technology. It maintains a high activated sludge concentration in the bioreactor, improves the organic load of biological treatment, and reduces the amount of excess sludge by maintaining a low sludge load. The anaerobic membrane bioreactor 100 can, under an anaerobic environment, through the action of anaerobic microorganisms, biodegrade methylamine in the wastewater and produce biogas, which mainly contains methane and a small amount of carbon dioxide. Compared with the existing anoxic-aerobic treatment process, since there is no need for aeration equipment to provide oxygen, it effectively reduces the floor area of the sewage treatment facilities and reduces the energy consumption during the process of treating wastewater.

[0048] The filtration membrane 130 is disposed inside the anaerobic membrane bioreactor 100 and serves to separate the reaction chamber 110 and the filtration chamber 120. The filtration membrane 130 can effectively intercept microorganisms and larger particulate matters, further improving the treatment effect of the wastewater.

[0049] Anaerobic activated sludge for reacting with the methylamine-containing wastewater is disposed in the reaction chamber 110, that is, activated sludge containing anaerobic digestion bacteria. The reaction chamber 110 is filled with anaerobic activated sludge that reacts with the methylamine-containing wastewater. The inlet 111 provided at the top of the reaction chamber 110 is used to introduce the methylamine-containing wastewater to be treated, and the exhaust port 112 is used to release the biogas generated during the reaction process. Exemplarily, the microorganism of the anaerobic activated sludge is methanogen, which can degrade methylamine in the wastewater into methane.

[0050] The filtration chamber 120 is located on the other side of the filtration membrane 130. The filtration chamber 120 and the reaction chamber 110 are separated by the filtration membrane 130. The clear water after anaerobic biological treatment and filtration by the filtration membrane 130 is discharged through the water outlet 121 provided at the top of the filtration chamber 120.

[0051] Exemplarily, the reaction chamber 110 is located on one side of the filtration membrane 130, and the filtration chamber 120 is located on the other side of the filtration membrane 130, for collecting the purified water that has passed through the filtration membrane 130 after treatment. Optionally, the filtration membrane 130 encloses a filtration chamber 120 within the reaction chamber 110.

[0052] In an alternative embodiment, the reactor is provided with a sludge discharge port communicating with the reaction chamber 110, and a sludge discharge valve 600 is provided at the sludge discharge port to discharge the excess sludge generated during the treatment of wastewater.

[0053] In an alternative embodiment, the methylamine-containing wastewater treatment device further includes a water inlet assembly 200 and a water discharge assembly 300. The water inlet assembly 200 includes a stirring tank 210 and a water inlet pipe 220. One end of the water inlet pipe 220 is connected to the stirring tank 210, and the other end is connected to the water inlet 111. A water inlet pump is provided on the water inlet pipe 220, and the water inlet pump is used to introduce the wastewater in the stirring tank 210 into the reaction chamber 110; the water discharge assembly 300 includes a drain pipe 310 and a water discharge pump 320. The drain pipe 310 is connected to the water outlet 121; the water discharge pump 320 is provided on the drain pipe 310, and the water discharge pump 320 is used to discharge the filtered water in the filtration chamber 120.

[0054] The stirring tank 210 serves as a pretreatment of the wastewater, which can mix and homogenize the methylamine-containing wastewater to be treated, helping to ensure the uniform distribution of pollutants in the wastewater, thereby improving the efficiency of subsequent biological treatment.

[0055] The water inlet pipe 220 is a pipe connecting the stirring tank 210 and the reaction chamber 110, which can transport the wastewater in the stirring tank 210 into the reaction chamber 110. A water inlet pump is provided on the water inlet pipe 220 to provide power for the transportation of the wastewater.

[0056] The drain pipe 310 is a pipe connecting the filtration chamber 120 and the external environment, which can discharge the clear water after biological treatment and membrane filtration. The exhaust pump is connected to the exhaust port 112 of the reaction chamber 110, and can discharge the gas generated during the reaction.

[0057] In an alternative embodiment, the methylamine-containing wastewater treatment device further includes a gas collection assembly 400. The gas collection assembly 400 includes a gas collection pipe 410. The gas collection pipe 410 is connected to the exhaust port 112 for discharging the gas generated in the reaction chamber 110.

[0058] A gas collecting pipe 410 and a gas collecting pump 420, the gas collecting pipe 410 is connected to the exhaust port 112; the gas collecting pump 420 is arranged on the exhaust pipe, and the gas collecting pump 420 is used to suck out the gas generated in the reaction chamber 110. The gas collecting pipe 410 is a pipe connecting the exhaust port 112 of the reaction chamber 110 and the subsequent treatment equipment, and its main function is to collect the gas generated in the reaction chamber 110, that is, biogas.

[0059] Exemplarily, a gas collecting pump 420 is arranged on the gas collecting pipe 410 to further provide power for the collection and transportation of gas. Optionally, a flow meter 450 is also arranged on the gas collecting pipe 410 to detect the gas flow rate.

[0060] In an alternative embodiment, the gas collection assembly 400 further includes an aeration pipe 430 and an aeration pump 440. One end of the aeration pipe 430 is connected to the exhaust port 112, and the other end is connected to the bottom of the reaction chamber 110; the aeration pump 440 is arranged on the aeration pipe 430.

[0061] One end of the aeration pipe 430 is connected to the exhaust port 112 of the reaction chamber 110, and the other end is connected to the bottom of the reaction chamber 110, so that the methane generated by the reaction can enter the reaction chamber 110 again, which helps to maintain the anaerobic environment in the reaction chamber 110, avoid the contact between microorganisms and oxygen, and thus improve the efficiency of biological treatment.

[0062] The aeration pump 440 is arranged on the aeration pipe 430 to provide power for the circulation or redistribution of gas. Exemplarily, by adjusting the rotation speed or opening degree of the aeration pump 440, the gas flow rate and pressure in the aeration pipe 430 can be controlled, so as to achieve precise regulation of the gas distribution in the reaction chamber 110.

[0063] In an alternative embodiment, the methylamine wastewater treatment device further includes a temperature control assembly 500, the temperature control assembly 500 includes a temperature control pipe 510 and a water bath 520, the temperature control pipe 510 includes a first section and a second section, the first section is arranged in the reaction chamber 110, and the second section is arranged outside the anaerobic membrane bioreactor 100; the water bath 520 is arranged on the second section, and the water bath 520 is used to control the temperature of the fluid medium in the temperature control pipe 510.

[0064] The water bath 520 is a heating or cooling device in the temperature control component 500. By adjusting the water temperature in the water bath 520, the temperature of the fluid medium in the temperature control pipeline 510 can be controlled, thereby realizing the regulation of the temperature in the reaction chamber 110. When the temperature in the reaction chamber 110 deviates from the set value, the fluid medium (such as water or heat-conducting oil) in the temperature control pipeline 510 will absorb or release heat, thus changing its temperature. This temperature change is transmitted to the water bath 520 through the second section of the temperature control pipeline 510. The water bath 520 automatically adjusts its heating or cooling power according to the received temperature signal to keep the temperature of the fluid medium in the temperature control pipeline 510 constant.

[0065] In the embodiment of the present application, through the temperature control component 500, the methylamine-containing wastewater treatment device can be adapted to the wastewater treatment requirements under different temperature conditions, improving the flexibility and universality of its application.

[0066] In an alternative embodiment, in the mixed liquid of filtered wastewater and anaerobic activated sludge, the mixed liquid is filtered through the filtration membrane 130. The membrane pore size of the filtration membrane 130 is 0.01 - 0.25 μm, and the area is 0.02 - 0.1 m 2 .

[0067] The above pore size range can effectively intercept microorganisms and larger particles, ensuring that only the purified water can pass through the membrane pores, preventing the loss of microorganisms, and maintaining a high biomass and activity. The area of the filtration membrane 130 is 0.02 to 0.1 square meters, which can ensure sufficient filtration flux while avoiding the cost increase and operation complexity caused by an overly large membrane module.

[0068] In an alternative embodiment, the filtration membrane 130 is a flat membrane, a hollow fiber membrane, a tubular membrane, or a disc membrane.

[0069] Among them, the flat membrane has a large effective area and a stable structure, is suitable for the treatment of wastewater with a high solid content, and is easy to clean and maintain; the hollow fiber membrane has a high packing density and a large specific surface area, can provide efficient solid-liquid separation effect, and is especially suitable for large-scale applications; the tubular membrane has a larger inner diameter and strong anti-pollution ability, is suitable for treating wastewater containing a high concentration of suspended solids or particles, and is easy to clean. The disc membrane is composed of multiple membrane sheets, has good anti-pollution performance and high flux, and is suitable for intermittent operation or applications that require frequent cleaning.

[0070] Which filtration membrane 130 to specifically select can be comprehensively considered in terms of factors such as wastewater type, actual working conditions, and treatment requirements, and then the corresponding selection can be made.

[0071] In an alternative embodiment, the membrane pressure of the filtration membrane 130 can be measured by a membrane pressure gauge. When the membrane pressure of the filtration membrane 130 is greater than or equal to 30 kPa, the filtration membrane 130 is cleaned. When the membrane pressure is greater than or equal to 30 kPa, it indicates that the filtration membrane 130 is severely contaminated, and thus cleaning is required to ensure the normal operation of the reactor. Specifically, it can be rinsed with clean water.

[0072] This application also provides a method for treating wastewater containing methylamine. Using the above-mentioned wastewater treatment device for methylamine-containing wastewater, it includes the following steps: introducing the wastewater containing methylamine into the reaction chamber 110 of the anaerobic membrane bioreactor 100, mixing the wastewater containing methylamine with the anaerobic activated sludge in the reaction chamber 110, and performing an anaerobic digestion reaction between the wastewater containing methylamine and the anaerobic activated sludge to degrade the methylamine in the wastewater containing methylamine; collecting the biogas generated by degrading the methylamine in the wastewater containing methylamine, and filtering the mixed liquid of the wastewater and the anaerobic activated sludge through the filtration membrane 130 to obtain filtered water.

[0073] First, the wastewater containing methylamine is introduced into the reaction chamber 110 of the anaerobic membrane bioreactor 100 through the inlet assembly 200. During this process, the wastewater is fully mixed with the anaerobic activated sludge preset in the reaction chamber 110. The mixed wastewater and anaerobic activated sludge perform an anaerobic digestion reaction in the reaction chamber 110. Microorganisms use the organic matter in the wastewater as a carbon source and energy source to perform an anaerobic digestion reaction and produce methane. The methane is collected through the exhaust port 112 and the gas collection assembly 400 for subsequent reuse.

[0074] The mixed liquid of the wastewater and the anaerobic activated sludge after the anaerobic digestion reaction is filtered through the filtration membrane 130. The filtration membrane 130 can intercept microorganisms and larger particulate matters, ensuring that only the purified water can pass through the membrane pores, preventing the loss of microorganisms, and maintaining a high biomass and activity. The filtered water is discharged through the water outlet 121 and the drainage assembly 300 for subsequent treatment or discharge.

[0075] Specifically, the wastewater to be treated is pumped into the reaction chamber 110 of the anaerobic membrane bioreactor 100. After the wastewater enters the reactor, the wastewater is fully mixed with the anaerobic activated sludge. It can be understood that the anaerobic activated sludge contains anaerobic microorganisms that can degrade methylamine. These microorganisms can effectively degrade methylamine and other organic pollutants in the wastewater under anaerobic conditions. During the anaerobic biological reaction process, one of the main products generated by the metabolism of microorganisms is biogas, and the main component of biogas is methane. These biogas can be guided to the gas collection device through the exhaust pipeline. The collected biogas can be further used for power generation or other forms of energy recovery, thus realizing the effective reuse of resources.

[0076] After a certain period of anaerobic reaction, the mixture of wastewater and anaerobic activated sludge in the reactor is filtered, so that larger particles and microorganisms are intercepted in the reactor, and the purified water is discharged. The purified water after filtration can be discharged or further purified.

[0077] In summary, in one aspect, the anaerobic membrane bioreactor 100 of the present application anaerobically treats the methylamine-containing wastewater. Under the action of anaerobic organisms, the organic pollutants in the wastewater generate biogas, a bioenergy source, reducing greenhouse gas emissions, thereby recycling the wastewater and helping to improve the resource conversion rate. On the other hand, since no additional oxygen supply is required, no oxygen supply aeration equipment is needed, which reduces the volume of the equipment used in the wastewater treatment process, effectively reducing the floor area of the wastewater treatment equipment and the energy consumption during the wastewater treatment process. In addition, the anaerobic membrane bioreactor 100 can retain sufficient microorganisms through the filtration membrane 130, avoiding the loss of organic matter, improving the methanation efficiency of the wastewater, and further enhancing its energy recovery ability.

[0078] It should be noted that when using the anaerobic membrane bioreactor 100 to treat methylamine-containing wastewater, the wastewater has a residence time in the reactor to degrade the methylamine in the wastewater. The residence time of the previous round of wastewater in the reactor may be different from that of the next round of wastewater. Among them, the average residence time of the wastewater from entering to leaving the anaerobic membrane reactor is the hydraulic retention time (HRT).

[0079] In an optional embodiment, the hydraulic retention time for the methylamine-containing wastewater treatment device to treat methylamine-containing wastewater for the first time is the first hydraulic retention time, and the hydraulic retention time for subsequent treatment of methylamine-containing wastewater is the second hydraulic retention time, and the second hydraulic retention time is less than or equal to the first hydraulic retention time.

[0080] It should be noted that treating methylamine-containing wastewater for the first time means that the first round of wastewater enters the reactor for anaerobic digestion treatment to degrade the methylamine in the wastewater, and subsequent treatment refers to the wastewater in other rounds after the first round of wastewater. It can be understood that the wastewater for subsequent treatment includes the second round of wastewater, the third round of wastewater, the fourth round of wastewater, etc.

[0081] The applicant found in the research that although methylamine can be degraded, the degradation rate is slow, resulting in a long lag period for treating methylamine-containing wastewater. The main reason is that the activity of anaerobic microorganisms is insufficient during the degradation of methylamine, resulting in a slow degradation rate of methylamine by microorganisms.

[0082] Therefore, in order to make the microorganisms in the anaerobic activated sludge have high activity, the first hydraulic retention time is greater than or equal to the second hydraulic retention time, so that the reactor starts to operate at a relatively high hydraulic retention time, enabling the microorganisms to better adapt to the methylamine wastewater, enhancing the microbial activity, and then domesticating the microorganisms.

[0083] In an alternative embodiment, the first hydraulic retention time is 30 - 36 h, the second hydraulic retention time decreases periodically, and the period of the decrease in the second hydraulic retention time is 25 - 40 days.

[0084] First, set the initial hydraulic retention time of the anaerobic membrane bioreactor 100 to 30 to 36 hours to ensure the stable operation of the system. During this period, closely monitor various operating parameters such as temperature, pH value, biogas production, COD removal rate, etc. to ensure that the reactor is in a normal operating state. After the reactor has been operating stably for a period of time, start gradually shortening the hydraulic retention time. The adjusted HRT should remain unchanged within an interval of 25 to 40 days to allow the reactor sufficient time to adapt to the new operating conditions. The specific amplitude of each shortening of the hydraulic retention time can be flexibly determined according to the actual situation to avoid causing too much impact on the reactor.

[0085] This embodiment helps to stimulate the microorganisms to adapt to the high - load environment, enhance their degradation ability and activity by gradually shortening the hydraulic retention time of the wastewater, thus contributing to improving the organic load treatment capacity of the reactor for more efficient treatment of methylamine - containing wastewater. In addition, by continuous monitoring and evaluation, the most suitable HRT range is found, which can not only ensure efficient organic matter degradation but also maintain the stability and economy in the wastewater treatment process.

[0086] In an alternative embodiment, the hydraulic retention time of the wastewater in the anaerobic membrane bioreactor 100 is 6 - 36 h, and the organic load range of the anaerobic membrane bioreactor 100 is 1 - 6 g COD / L / d.

[0087] It should be noted that the organic load is usually expressed in terms of chemical oxygen demand (COD), which refers to the amount of organic matter that a unit volume of the reactor can treat per day (g COD / L / d). Increasing the organic load means that within the same volume of the reactor, more organic substances can be treated per unit time.

[0088] During the treatment of methylamine - containing wastewater, an appropriate HRT is crucial for maintaining sufficient microbial biomass and activity. If the HRT is too short, it will cause the microorganisms not to have enough time to attach or adapt to the environment, affecting the treatment efficiency; if the HRT is too long, it will lead to a longer retention time of the wastewater and greater energy consumption. Setting the hydraulic retention time to 6 - 36 h helps to ensure the normal progress of wastewater treatment.

[0089] An appropriate organic loading range helps to select the appropriate reactor size, configuration, and operating conditions, ensuring that the reactor can effectively handle the expected pollution load. During actual operation, controlling the organic loading within the range of 1 - 6 g COD / L / d can ensure the stability and treatment efficiency of the reactor, avoiding a decline in treatment effect or system failure caused by overloading.

[0090] Set the organic loading range to 1 - 6 g COD / L / d. That is to say, the reactor volume per liter can handle 1 to 6 grams of chemical oxygen demand per day. As the reactor operates stably, the organic loading can be gradually increased to a higher level (such as 5 - 6 g COD / L / d).

[0091] In an alternative embodiment, the temperature inside the anaerobic bioreactor is 20 - 40 °C.

[0092] Maintain the temperature inside the anaerobic membrane bioreactor 100 between 20 and 40 °C. This temperature range can provide a suitable growth environment for anaerobic microorganisms, promote their metabolic activities, and thus improve the degradation efficiency of methylamine and other organic pollutants. The temperature inside the anaerobic membrane bioreactor 100 can be controlled by a water bath 520.

[0093] In an alternative embodiment, before introducing the wastewater into the reaction chamber 110 of the anaerobic membrane bioreactor 100, nitrogen gas is introduced into the reaction chamber 110 for aeration to maintain an anaerobic environment inside the reaction chamber 110. The nitrogen gas can be obtained from the gas generated inside the reaction chamber 110.

[0094] Since an anaerobic environment needs to be maintained inside the anaerobic membrane bioreactor 100, nitrogen gas can be introduced for aeration before the reactor operates to keep it in an anaerobic environment, ensuring that microorganisms degrade the wastewater.

[0095] During the wastewater treatment process, the biogas generated by the reaction can be introduced into the reactor through the aeration pipeline. Specifically, the biogas accumulated in the reactor headspace can be pumped to the bottom of the reactor and evenly aerated under the action of the gas distribution passage. In this way, on the one hand, it plays a role in stirring the sludge mixture evenly, and on the other hand, it can wash the membrane surface and delay the formation of membrane surface fouling.

[0096] In an alternative embodiment, the flow rate of nitrogen gas introduced is 1 - 20 L / min, and the aeration time is 2 - 10 minutes.

[0097] The following further illustrates the present application through examples:

[0098] The implementation example of this application is carried out in an anaerobic membrane bioreactor 100 on a laboratory scale. An anaerobic membrane bioreactor 100 with an effective volume of 1.5 L is used and operated under temperature conditions of 20 - 40 °C. The pore size of the filtration membrane 130 of the membrane module is 0.01 - 0.25 μm, and the area is 0.02 - 0.1 m 2 , and it is an immersed flat membrane made of PVDF.

[0099] The type of methylamine wastewater to be treated is wastewater containing methylamine, and its main pollution components include 600 mg / L of methanol, 100 mg / L of monomethylamine, 100 mg / L of dimethylamine, and 100 mg / L of trimethylamine. The pH of the wastewater is 9.6, and the total organic matter content is 1500 mg COD / L.

[0100] This application example uses conventional anaerobic digestion sludge with a fixed sludge concentration of 8.0 g / L. It starts to operate safely with a hydraulic retention time of 36 h, and then is gradually shortened to 24 h, 12 h, 8 h, and 6 h. The organic load of the reactor is 1 g COD / L / d, 1.5 g COD / L / d, 3 g COD / L / d, 4.5 g COD / L / d, and 6 g COD / L / d respectively. The experimental results show that 8 h is the optimal working condition, and a load of 6 h is too large and dangerous.

[0101] As Figure 2 and Figure 3 shown, during the stable operation stage with a hydraulic retention time of 12 h and 8 h, the anaerobic membrane bioreactor 100 has a good organic matter removal rate, reaching over 95%. Its methanation efficiency is also relatively excellent, and the methane production rate reaches about 280 ml CH 4 / g COD, and it has an excellent ability to recover bioenergy.

[0102] As Figure 4 and Figure 5 shown, this invention has excellent energy surplus and the ability to reduce CO 2 emissions. The net energy potential is 4.201 kW·h / m 3 , and it can reduce 2.311 kg of CO 2 / m 3 carbon emissions.

[0103] In summary, the implementation example of this application has the following advantages: (1) low power consumption and low operating cost; (2) good treatment effect, can effectively remove organic pollutants, and has good effluent water quality; (3) considerable treatment scale, can withstand a higher load of water volume; (4) good stability, wide application range, and can be applied to various sewage and wastewater; (5) good energy recovery effect, excellent carbon emission reduction ability, and excellent environmental friendliness.

[0104] Other embodiments of the present application will be readily apparent to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. The present application is intended to cover any variations, uses, or adaptations of the present application, which follow the general principles of the present application and include known common general knowledge or conventional technical means in the technical field not disclosed in the present application. The specification and examples are only to be considered as exemplary, and the true scope and spirit of the present application are pointed out by the following claims.

[0105] It should be understood that the present application is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present application is only limited by the appended claims.

Claims

1. A methylamine-containing wastewater treatment device, characterized in that: include: Anaerobic membrane bioreactor (100); A filter membrane (130) is arranged in the anaerobic membrane bioreactor (100) to separate the anaerobic membrane bioreactor (100) into a reaction chamber (110) and a filter chamber (120); the reaction chamber (110) is used to arrange anaerobic activated sludge for reacting with methylamine-containing wastewater; a water inlet (111) and an exhaust port (112) are arranged at the top of the reaction chamber (110); and a water outlet (121) is arranged in the filter chamber (120).

2. The methylamine-containing wastewater treatment device according to claim 1, characterized in that: Also includes: A water inlet assembly (200), the water inlet assembly (200) comprising a stirring barrel (210) and a water inlet pipe (220), one end of the water inlet pipe (220) being connected to the stirring barrel (210), and the other end being connected to the water inlet (111), the water inlet pump being arranged on the water inlet pipe (220), and being used for passing waste water in the stirring barrel (210) into the reaction chamber (110); A drainage component (300), the drainage component (300) comprising a drainage pipe (310) and a drainage pump (320), the drainage pipe (310) being connected to the water outlet (121); the drainage pump (320) being arranged on the drainage pipe (310), and the drainage pump (320) being used to discharge filtered water from the filter chamber (120).

3. The methylamine-containing wastewater treatment device according to claim 1, characterized in that: It also includes a gas collection assembly (400), wherein the gas collection assembly (400) includes a gas collecting pipe (410), and the gas collecting pipe (410) is connected to the exhaust port (112) and is used to discharge the gas generated in the reaction chamber (110).

4. The methylamine-containing wastewater treatment device according to claim 3, characterized in that: The gas collection assembly (400) further comprises: an aeration pipe (430), one end of the aeration pipe (430) being connected to the exhaust port (112), and the other end of the aeration pipe (430) being connected to the bottom of the reaction chamber (110); An aeration pump (440), wherein the aeration pump (440) is disposed on the aeration pipeline (430).

5. The methylamine-containing wastewater treatment device according to claim 1, characterized in that: The device also includes a temperature control component (500), wherein the temperature control component (500) includes: a temperature control pipe (510), the temperature control pipe (510) comprising a first section and a second section, the first section being arranged in the reaction chamber (110), and the second section being arranged outside the anaerobic membrane bioreactor (100); A water bath (520), the water bath (520) is disposed in the second section, and the water bath (520) is used to control the temperature of the fluid medium in the temperature control pipe (510).

6. The methylamine-containing wastewater treatment device according to any one of claims 1 to 5, characterized in that: The pore size of the filter membrane (130) is 0.01 to 0.25 μm, and the area of ​​the filter membrane (130) is 0.02 to 0.1 m 2 , And / or, the filtration membrane (130) is a flat membrane, a hollow fiber membrane, a tubular membrane or a disc membrane.

7. A method for treating methylamine-containing wastewater, characterized in that: Using the methylamine-containing wastewater treatment device according to any one of claims 1 to 6, the method comprises the following steps: Passing methylamine-containing wastewater into the reaction chamber (110) of the anaerobic membrane bioreactor (100); Mixing the methylamine-containing wastewater with the anaerobic activated sludge in the reaction chamber (110), and subjecting the methylamine-containing wastewater and the anaerobic activated sludge to an anaerobic digestion reaction to degrade the methylamine in the methylamine-containing wastewater; The biogas generated by degrading the methylamine in the methylamine-containing wastewater is collected, and a mixed solution of the wastewater and the anaerobic activated sludge is filtered through a filter membrane (130) to obtain filtered water.

8. The method for treating methylamine-containing wastewater according to claim 7, characterized in that: The hydraulic retention time of the methylamine-containing wastewater treatment device for the first treatment of the methylamine-containing wastewater is the first hydraulic retention time, and the hydraulic retention time of the subsequent treatment of the methylamine-containing wastewater is the second hydraulic retention time, and the second hydraulic retention time is less than or equal to the first hydraulic retention time.

9. The method for treating methylamine-containing wastewater according to claim 8, characterized in that: The first hydraulic retention time is 30 to 36 hours, and the second hydraulic retention time is periodically reduced, and the period of reduction of the second hydraulic retention time is 25 to 40 days.

10. The method for treating methylamine-containing wastewater according to claim 7, characterized in that: Before the wastewater is introduced into the reaction chamber (110) of the anaerobic membrane bioreactor (100), the method further comprises: Nitrogen is introduced into the reaction chamber (110) for aeration to maintain an anaerobic environment in the reaction chamber (110).

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