Aniline wastewater treatment system
The aniline wastewater treatment system, which combines filtration, electrocatalysis and biochemical treatment, effectively degrades high-concentration aniline, solves the problems of high treatment difficulty and low efficiency in existing technologies, and achieves efficient and stable wastewater treatment effects.
Patent Information
- Application Number
- CN202422608550.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-28
- Publication Date
- 2025-09-09
- Estimated Expiration
- 2034-10-28
AI Technical Summary
Existing technologies are difficult to effectively treat high-concentration, highly toxic aniline wastewater. Biological treatment systems are difficult to operate stably and are inefficient. Traditional methods may not be able to meet emission standards or achieve complete harmless treatment.
A combined treatment system of filtration, electrocatalysis, defoaming and ABR+AO+MBR integrated devices is used. The benzene ring and amino group of aniline are destroyed by electrocatalysis, and sodium hypochlorite is formed by Cl- to degrade ammonia nitrogen and COD. Combined with biochemical treatment, efficient removal is achieved. MBR membrane components are used for mud and water separation.
The aniline concentration was reduced to below 85% to 95% of the raw water, while nitrogen and phosphorus pollutants were removed simultaneously, shortening the construction period and saving civil engineering costs, providing stable water inlet conditions, and improving land utilization and treatment efficiency.
Smart Images
Figure CN223316551U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of aniline wastewater treatment, in particular to an aniline wastewater treatment system. Background Art
[0002] Aniline wastewater primarily originates from the production of dyes, pigments, herbicides, fungicides and pesticides, and flavors and fragrances. This wastewater is characterized by high salinity, high concentration, and high toxicity, posing a significant threat to the environment. Currently, methods for treating aniline wastewater primarily include physical, chemical, and biological methods. Physical methods, such as precipitation, filtration, and adsorption, are primarily used to separate suspended matter from dissolved substances in the wastewater. Chemical methods utilize oxidation, reduction, and neutralization reactions to convert organic matter in the wastewater into harmless substances or easily biodegradable small molecules. Biological methods utilize microorganisms to degrade and transform organic matter in the wastewater. However, the high toxicity and poor biodegradability of aniline make stable operation of biological treatment systems difficult and inefficient. Furthermore, the high salt content and strong acidity and alkalinity of the wastewater increase the difficulty and cost of treatment.
[0003] To address these issues, researchers are constantly exploring new treatment methods. For example, Fenton oxidation can improve the biodegradability of aniline wastewater, but this can result in high reagent costs. Extraction can reduce aniline concentrations, but this can lead to secondary pollution. Given the high toxicity, high concentration, and poor biodegradability of aniline wastewater, traditional treatment methods may in some cases fail to meet existing emission standards or achieve complete harmless treatment of the wastewater. Therefore, the search for new and more efficient methods for treating aniline wastewater has become crucial. Utility Model Content
[0004] In view of the deficiencies in the prior art, the present invention provides an aniline wastewater treatment system to solve the problems raised in the above background technology.
[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:
[0006] An aniline wastewater treatment system comprises a filtering device, an electrocatalytic device, a defoaming device and an ABR+AO+MBR integrated device, wherein a filtering water inlet is provided on the left side of the filtering device, a slag discharge port is provided on the left side of the filtering device, and a filtering water outlet is provided on the right side of the filtering device. There are multiple electrocatalytic devices, and the bottoms of the multiple electrocatalytic devices are all provided with an electrocatalytic water inlet, and the tops of the multiple electrocatalytic devices are all provided with an electrocatalytic water outlet. The electrocatalytic water inlets and electrocatalytic water outlets on two electrocatalytic devices are connected by a conduit, and an online organic matter sensor is provided on the conduit. A defoaming water inlet is provided on the left side of the defoaming device, a filter plate is provided inside the defoaming device, and a defoaming exhaust port is provided on the top of the defoaming device. A defoaming outlet is provided at the bottom of the defoaming device. The ABR+AO+MBR integrated device includes an anaerobic zone, an anoxic zone and an aerobic zone. An integrated water inlet is provided on the left side of the anaerobic zone. A baffle is provided inside the anaerobic zone. A first filler layer is provided inside the anaerobic zone. A water outlet weir and a water hole are provided inside the anaerobic zone. An integrated exhaust port is provided at the top of the anaerobic zone. A second filler layer is provided inside the anoxic zone. An aeration pipe is provided inside the aerobic zone. A blower is provided on the aeration pipe. An MBR membrane assembly is provided inside the aerobic zone. An integrated water outlet is provided on the right side of the aerobic zone. A drainage pipe is provided inside the aerobic zone, and a water outlet pump is provided on the drainage pipe, and the drainage pipe is connected to the integrated water outlet.
[0007] Preferably, the filtered water outlet on the filtering device is connected to the electrocatalytic water inlet on the first electrocatalytic device through a pipeline, and a water inlet pump and a flow meter are provided on the pipeline.
[0008] Preferably, the electrocatalytic device is provided with an anode wire, a DC power supply is provided on the anode wire, a cathode wire is provided on the DC power supply, and the cathode wire is connected to the electrocatalytic device.
[0009] Preferably, the defoaming water inlet is connected to the electrocatalytic water outlet on the last electrocatalytic device through a pipe, and the defoaming water outlet is connected to the integrated water inlet through a pipe.
[0010] Preferably, a sludge hopper is provided at the bottom of the inner wall of the anaerobic zone, a first sludge return pipe is provided at the bottom of the anaerobic zone, and a sludge return pump is provided on the first sludge return pipe.
[0011] Preferably, a second sludge return pipe is provided inside the aerobic zone, a return pump is provided on the second sludge return pipe, and the left end of the second sludge return pipe is located inside the anoxic zone.
[0012] Preferably, the first filler layer uses anaerobic elastic filler, and the second filler layer uses anoxic elastic filler.
[0013] Compared with the prior art, the present invention has the following beneficial effects: the electrocatalytic technology of the aniline wastewater treatment system can effectively destroy the benzene ring and amino group of aniline, and utilize the high concentration of Cl- in the wastewater to form sodium hypochlorite, thereby efficiently degrading ammonia nitrogen and part of COD. After this treatment step, the aniline concentration in the wastewater can generally be reduced to below 85% to 95% of the raw water. The wastewater after electrocatalytic treatment is defoamed and homogenized by a defoaming device, providing stable water inlet conditions for subsequent biochemical treatment. The first filler layer is provided in the anaerobic zone to increase the microbial concentration within the device and shorten the anaerobic acclimation time. At the same time, the filler can intercept sludge rising with the water flow. In the anoxic and aerobic zones, the system can simultaneously remove nitrogen and phosphorus pollutants. The MBR membrane assembly is provided in the aerobic zone, effectively reducing the device volume and improving land utilization. The physical interception achieves mud and water separation. The combination of electrocatalysis and biochemical treatment achieves efficient treatment of high-concentration aniline wastewater. The integrated device design shortens the construction period, saves civil engineering costs, and facilitates maintenance and parts replacement. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 This is a schematic diagram of the structure of the utility model.
[0015] Figure: 1. Filter device; 101. Filter water inlet; 102. Slag outlet; 103. Filter water outlet; 2. Electrocatalytic device; 201. Electrocatalytic water inlet; 202. Online organic matter sensor; 203. Electrocatalytic water outlet; 204. Anode line; 205. DC power supply; 206. Cathode line; 3. Defoaming device; 301. Defoaming water inlet; 302. Filter plate; 303. Defoaming exhaust port; 304. Defoaming outlet; 4. ABR+AO+MBR Integrated device; 401, integrated water inlet; 402, baffle; 403, first packing layer; 404, outlet weir; 405, water hole; 406, integrated exhaust port; 407, first sludge return pipe; 408, sludge return pump; 409, second packing layer; 410, aeration pipe; 411, blower; 412, second sludge return pipe; 413, outlet pump; 414, integrated water outlet; 415, MBR membrane assembly; 5, water inlet pump; 6, flow meter. DETAILED DESCRIPTION
[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0017] Reference Figure 1, an aniline wastewater treatment system, comprising a filtering device 1, an electrocatalytic device 2, a defoaming device 3 and an ABR+AO+MBR integrated device 4, a filtering water inlet 101 is provided on the left side of the filtering device 1, a slag discharge port 102 is provided on the left side of the filtering device 1, a filtering water outlet 103 is provided on the right side of the filtering device 1, the number of electrocatalytic devices 2 is multiple, and the bottom of the multiple electrocatalytic devices 2 are all provided with an electrocatalytic water inlet 201, the filtering water outlet 103 on the filtering device 1 is connected to the electrocatalytic water inlet 201 on the first electrocatalytic device 2 through a pipeline, and a water inlet pump 5 and a flow meter 6 are provided on the pipeline, the multiple electrocatalytic devices 2 are all provided with an electrocatalytic water outlet 203 on the top, and the electrocatalytic water inlet 201 on the two electrocatalytic devices 2 is connected to the electrocatalytic water inlet 201 on the first electrocatalytic device 2. 01 is connected to the electrocatalytic water outlet 203 through a conduit, and an online organic matter sensor 202 is provided on the conduit, an anode line 204 is provided on the electrocatalytic device 2, a DC power supply 205 is provided on the anode line 204, a cathode line 206 is provided on the DC power supply 205, and the cathode line 206 is connected to the electrocatalytic device 2 to facilitate the electrocatalytic device 2 to be energized, thereby performing electrocatalysis. A defoaming water inlet 301 is provided on the left side of the defoaming device 3, a filter plate 302 is provided inside the defoaming device 3, a defoaming exhaust port 303 is provided on the top of the defoaming device 3, and a defoaming water outlet 304 is provided at the bottom of the defoaming device 3. The ABR+AO+MBR integrated device 4 includes an anaerobic zone, an anoxic zone and an aerobic zone, and an integrated The water inlet 401, the defoaming water inlet 301 and the electrocatalytic water outlet 203 on the last electrocatalytic device 2 are connected by a pipe, the defoaming water outlet 304 and the integrated water inlet 401 are connected by a pipe, a baffle 402 is provided inside the anaerobic zone, a first packing layer 403 is provided inside the anaerobic zone, a water outlet weir 404 and a water hole 405 are provided inside the anaerobic zone, an integrated exhaust port 406 is provided on the top of the anaerobic zone, a second packing layer 409 is provided inside the anoxic zone, an aeration pipe 410 is provided inside the aerobic zone, a blower 411 is provided on the aeration pipe 410, an MBR membrane assembly 415 is provided inside the aerobic zone, an integrated water outlet 414 is provided on the right side of the aerobic zone, a drainage pipe is provided inside the aerobic zone, and drainage A water outlet pump 413 is provided on the pipeline, and the drainage pipeline is connected to the integrated water outlet 414. A sludge hopper is provided at the bottom of the inner wall of the anaerobic zone, and a first sludge return pipe 407 is provided at the bottom of the anaerobic zone. A sludge return pump 408 is provided on the first sludge return pipe 407. This system not only increases the sludge concentration in the anaerobic zone, but also improves the activity of microorganisms. A second sludge return pipe 412 is provided inside the aerobic zone, and a return pump is provided on the second sludge return pipe 412. The left end of the second sludge return pipe 412 is located inside the anoxic zone, which is convenient for returning part of the sludge in the aerobic zone to the anoxic zone. This operation helps to maintain the sludge balance between the anoxic zone and the aerobic zone and maintain the stable operation of the system. The first filler layer 403 uses anaerobic elastic filler.The second packing layer 409 uses anoxic elastic packing. This aniline wastewater treatment system uses electrocatalytic technology to effectively break the benzene rings and amino groups of aniline, utilizing the high concentration of Cl- in the wastewater to form sodium hypochlorite, which effectively degrades ammonia nitrogen and some COD. After this treatment, the aniline concentration in the wastewater can typically be reduced to below 85% to 95% of the raw water. The electrocatalytically treated wastewater is then defoamed and homogenized by the defoaming device 3, providing stable inlet conditions for subsequent biochemical treatment. The first packing layer 403 is installed in the anaerobic zone to increase the microbial concentration within the device and shorten the anaerobic acclimation time. Simultaneously, the packing intercepts sludge rising with the water flow. In both the anoxic and aerobic zones, the system simultaneously removes nitrogen and phosphorus pollutants. The MBR membrane assembly 415 is located in the aerobic zone, effectively reducing device volume and improving land utilization. Physical interception allows for sludge-water separation. The combination of electrocatalysis and biochemical treatment enables efficient treatment of high-concentration aniline wastewater. The integrated device design shortens construction time, saves civil engineering costs, and facilitates maintenance and parts replacement.
[0018] During use: aniline wastewater will enter the filter device 1 from the filter water inlet 101. After being filtered by the filter device 1, the waste residue will be discharged from the residue discharge port 102. The filtered water will enter the electrocatalytic device 2 from the filter water outlet 103 through the water inlet pump. The flow meter 6 adjusts the inlet flow rate to control the treatment time of the wastewater in the electrocatalytic device 2. The electrocatalytic devices 2 are connected in series in this way. The wastewater treatment time in each electrocatalytic device 2 is consistent. The reaction current is determined according to the inlet water concentration and the effluent of the previous electrocatalytic device. The wastewater concentration is determined by the online organic matter sensor 202. The inlet COD and aniline concentrations: COD < 5000 mg / L and When the aniline concentration is less than 200 mg / L, the electrocatalytic residence time of each stage is 30 to 180 s, and the total residence time is 120 to 600 s; when the influent COD and aniline concentration is: 5000 ≤ COD < 8000 mg / L and 200 ≤ aniline < 500 mg / L, the electrocatalytic residence time of each stage is 60 to 300 s, and the total residence time is 300 to 1200 s; when the influent COD and aniline concentration is: 8000 ≤ COD < 15000 mg / L and 500 ≤ aniline < 1000 mg / L, the electrocatalytic residence time of each stage is 200 to 500 s, and the total residence time is 900 to 1800 s.Among them, the aniline concentration is: when aniline is less than 300 mg / L, the current density is 5-10 mA / cm2; when 300≤aniline is less than 500 mg / L, the current density is 8-20 mA / cm2; when aniline is greater than 500 mg / L, the current density is 15-30 mA / cm2. The wastewater after electrocatalytic treatment is discharged from the electrocatalytic water outlet 203 on the last electrocatalytic device 2 and enters the defoaming device 3. Due to the intense reaction process during the electrocatalytic process, a large amount of foam will be contained in the effluent. When the wastewater and foam pass through the filter plate 302, the foam is cut into smaller bubbles by the tiny holes or surface roughness on the filter plate 302. These bubbles are Small bubbles are easier to break. At the same time, the filter plate 302 can also block part of the foam, preventing it from continuing to flow forward, and the defoaming exhaust port 303 allows air and unbroken foam to be discharged, thereby maintaining normal pressure inside the device, and then enters the anaerobic zone of the ABR+AO+MBR integrated device 4. The water flow can be guaranteed through the water hole 405, and the baffle 402 is used to slow down the water flow rate, increase the contact time between sewage and sludge, thereby promoting the anaerobic biological reaction. After electrocatalysis and anaerobic treatment, the concentrations of aniline and COD in the wastewater have been greatly reduced, but there is still a certain distance from the discharge standard. It will then enter the anoxic zone. The anoxic zone set The oxygen elastic filler provides a large surface area to promote the attachment and growth of microorganisms, thereby effectively increasing the sludge concentration inside the device. At the same time, the filler can also intercept the sludge rising with the wastewater, play a role in solid-liquid separation, and reduce the load of solid matter in the subsequent treatment process. The wastewater treated in the anoxic zone then enters the aerobic zone. Aeration pipes 410 are provided at the bottom of the aerobic zone. These aeration pipes 410 continuously input air into the water to ensure that the dissolved oxygen concentration in the aerobic zone is maintained at an appropriate level to meet the metabolic needs of aerobic microorganisms. Aerobic microorganisms can further degrade organic matter in the wastewater and convert it into harmless substances. In the aerobic zone, There is an MBR membrane assembly 415. The MBR membrane assembly 415 separates microorganisms and solid particles in the water from the water by physical interception, thereby realizing mud-water separation. This step not only improves the water quality of the effluent, but also facilitates subsequent sludge treatment. In addition, the aerobic zone is also provided with a second sludge return pipe 412 to return part of the sludge in the aerobic zone to the anoxic zone. This operation helps to maintain the sludge balance between the anoxic zone and the aerobic zone and maintain the stable operation of the system. At this time, its water quality has reached or exceeded the discharge standard, and the wastewater is discharged through the integrated outlet 414 for normal discharge. At this point, the entire wastewater treatment process is completed.
[0019] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.
[0020] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. An aniline wastewater treatment system, comprising a filtration device (1), an electrocatalytic device (2), a defoaming device (3) and an ABR+AO+MBR integrated device (4), characterized in that: The filter device (1) is provided with a filter water inlet (101) on the left side, a slag discharge port (102) on the left side, and a filter water outlet (103) on the right side. The electrocatalytic devices (2) are provided in multiple numbers, and the bottoms of the multiple electrocatalytic devices (2) are provided with an electrocatalytic water inlet (201), and the tops of the multiple electrocatalytic devices (2) are provided with an electrocatalytic water outlet (203). The electrocatalytic water inlets (201) and the electrocatalytic water outlets (203) on the two electrocatalytic devices (2) are connected via a conduit, and an online organic matter sensor (202) is provided on the conduit. The defoaming device (3) is provided with a defoaming water inlet (301) on the left side, a filter plate (302) is provided inside the defoaming device (3), a defoaming exhaust port (303) is provided on the top of the defoaming device (3), and a defoaming water outlet (303) is provided on the bottom of the defoaming device (3). 304), the ABR+AO+MBR integrated device (4) includes an anaerobic zone, an anoxic zone and an aerobic zone, an integrated water inlet (401) is provided on the left side of the anaerobic zone, a baffle (402) is provided inside the anaerobic zone, a first filler layer (403) is provided inside the anaerobic zone, a water outlet weir (404) and a water hole (405) are provided inside the anaerobic zone, an integrated exhaust port (406) is provided on the top of the anaerobic zone, and the anoxic zone A second filler layer (409) is provided inside the aerobic zone, an aeration pipe (410) is provided inside the aerobic zone, a blower (411) is provided on the aeration pipe (410), an MBR membrane assembly (415) is provided inside the aerobic zone, an integrated water outlet (414) is provided on the right side of the aerobic zone, a drainage pipe is provided inside the aerobic zone, a water outlet pump (413) is provided on the drainage pipe, and the drainage pipe is connected to the integrated water outlet (414).
2. The aniline wastewater treatment system according to claim 1, characterized in that: The filtered water outlet (103) on the filtering device (1) and the electrocatalytic water inlet (201) on the first electrocatalytic device (2) are connected via a pipeline, and a water inlet pump (5) and a flow meter (6) are provided on the pipeline.
3. The aniline wastewater treatment system according to claim 1, characterized in that: The electrocatalytic device (2) is provided with an anode wire (204), a DC power supply (205) is provided on the anode wire (204), a cathode wire (206) is provided on the DC power supply (205), and the cathode wire (206) is connected to the electrocatalytic device (2).
4. The aniline wastewater treatment system according to claim 1, characterized in that: The defoaming water inlet (301) is connected to the electrocatalytic water outlet (203) on the last electrocatalytic device (2) via a pipe, and the defoaming water outlet (304) is connected to the integrated water inlet (401) via a pipe.
5. The aniline wastewater treatment system according to claim 1, characterized in that: A sludge hopper is provided at the bottom of the inner wall of the anaerobic zone, a first sludge return pipe (407) is provided at the bottom of the anaerobic zone, and a sludge return pump (408) is provided on the first sludge return pipe (407).
6. The aniline wastewater treatment system according to claim 1, characterized in that: A second sludge return pipe (412) is provided inside the aerobic zone, a return pump is provided on the second sludge return pipe (412), and the left end of the second sludge return pipe (412) is located inside the anoxic zone.
7. The aniline wastewater treatment system according to claim 1, characterized in that: The first filler layer (403) is an anaerobic elastic filler, and the second filler layer (409) is an anoxic elastic filler.