Biomass wastewater treatment system and biomass wastewater treatment method

Abstract

The invention belongs to the technical field of wastewater treatment, and discloses a biomass wastewater treatment system and a biomass wastewater treatment method.The biomass wastewater treatment system comprises a first filter unit, a micro-electrolytic tank, a coagulative precipitation tank, a hydrolysis acidification tank, an anaerobic reactor, an anaerobic-aerobic tank, a second filter unit, an electrodialyzer and an evaporator, the micro-electrolytic tank is connected with the first filtering unit; the coagulative precipitation tank is connected with the micro-electrolysis tank; the hydrolysis acidification tank is connected with the coagulative precipitation tank; the anaerobic reactor is connected with the hydrolysis acidification pool and the anaerobic-aerobic pool; the second filter unit is connected with the anaerobic-aerobic tank; the electrodialyzer is arranged at the downstream of the second filtering unit, and the evaporator is connected with the electrodialyzer; the first filter unit, the micro-electrolytic tank, the coagulative precipitation tank, the hydrolysis acidification tank, the anaerobic reactor, the anaerobic-aerobic tank, the second filter unit, the electrodialyzer and the evaporator are sequentially arranged along the wastewater discharge direction. Therefore, the biomass wastewater treatment difficulty can be reduced, and the biomass wastewater utilization rate can be increased.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater treatment, and in particular to a biomass wastewater treatment system and a biomass wastewater treatment method. Background Art

[0002] Wastewater treatment refers to the process of removing pollutants from wastewater through a series of physical, chemical or biological methods. The purpose of wastewater treatment is to protect the environment, prevent water pollution, and recover useful substances.

[0003] Biomass wastewater refers to wastewater generated during the processing of biological materials. This type of wastewater usually contains a large amount of organic matter and other pollutants. Biomass wastewater generated by industries such as traditional Chinese medicine and food processing usually has the characteristics of high chemical oxygen demand (COD) and high salt. The wastewater treatment is difficult, and the large amount of salt contained in the wastewater is difficult to utilize, which makes the cost of biomass utilization high. There are problems such as the difficulty of biomass wastewater treatment and low utilization rate. Summary of the invention

[0004] The object of the present invention is to provide a biomass wastewater treatment system and a biomass wastewater treatment method to solve the problems of great difficulty in biomass wastewater treatment and low utilization rate.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] In a first aspect, a biomass wastewater treatment system comprises: a first filtering unit for filtering solid impurities in wastewater; a micro-electrolysis cell, the micro-electrolysis cell is connected to the first filtering unit and is used for micro-electrolysis of wastewater; a coagulation sedimentation tank, the coagulation sedimentation tank is connected to the micro-electrolysis cell and is used for sedimentation of wastewater; a hydrolysis acidification tank, the hydrolysis acidification tank is connected to the coagulation sedimentation tank; an anaerobic reactor and an anaerobic aerobic tank, the anaerobic reactor is connected to the hydrolysis acidification tank and the anaerobic aerobic tank and is used for decomposing organic matter in wastewater; a second filter unit is connected to the micro-electrolysis cell and is used for micro-electrolysis of wastewater; a coagulation sedimentation tank is connected to the micro-electrolysis cell and is used for sedimentation of wastewater; a hydrolysis acidification tank is connected to the hydrolysis acidification tank and the anaerobic aerobic tank; an anaerobic reactor and an anaerobic aerobic tank are connected to the hydrolysis acidification tank and the anaerobic aerobic tank and are used for decomposing organic matter in wastewater; a second filter unit is connected to the micro-electrolysis cell and is used for micro-electrolysis of wastewater; a coagulation sedimentation tank is connected to the micro-electrolysis cell and is used for sedimentation of wastewater; a hydrolysis acidification tank is connected to the hydrolysis acidification tank and the anaerobic aerobic tank and is ... The invention relates to a filter unit, wherein the second filter unit is connected to the anaerobic aerobic tank and is used to filter the wastewater output from the anaerobic aerobic tank; an electrodialyzer and an evaporator, wherein the electrodialyzer is arranged downstream of the second filter unit, and the evaporator is connected to the electrodialyzer and is used to extract salt from the wastewater; the first filter unit, the micro-electrolysis cell, the coagulation sedimentation tank, the hydrolysis acidification tank, the anaerobic reactor, the anaerobic aerobic tank, the second filter unit, the electrodialyzer and the evaporator are arranged in sequence along the wastewater discharge direction.

[0007] Preferably, the first filtering unit comprises a grid regulating tank and a hydraulic screen, wherein the hydraulic screen is arranged downstream of the grid regulating tank and connected to the input end of the micro-electrolysis cell.

[0008] Preferably, the second filtering unit comprises a membrane bioreactor, which is connected to the output end of the anaerobic aerobic tank and is used to filter the wastewater output from the anaerobic aerobic tank.

[0009] Preferably, the second filtration unit further comprises a nanofiltration unit, which is arranged downstream of the membrane bioreactor and connected to the input end of the electrodialyzer.

[0010] Preferably, the nanofiltration is connected to a wastewater loop, and one end of the wastewater loop away from the nanofiltration is connected to the micro-electrolysis cell for conveying separated wastewater to the micro-electrolysis cell.

[0011] Preferably, the biomass wastewater treatment system further comprises a sludge tank, and the sludge tank is connected to the membrane bioreactor.

[0012] Preferably, the membrane bioreactor is connected to a sludge loop, and the sludge loop is connected to the anaerobic aerobic tank for conveying at least part of the sludge in the membrane bioreactor to the anaerobic aerobic tank.

[0013] Preferably, the anaerobic aerobic tank comprises an anoxic tank and an aerobic tank, and the sludge loop is connected to the anoxic tank.

[0014] Preferably, the biomass wastewater treatment system further comprises a sludge tank, and the coagulation sedimentation tank, the hydrolysis acidification tank and the anaerobic reactor are all connected to the sludge tank.

[0015] In a second aspect, a biomass wastewater treatment method is applied to the biomass wastewater treatment system as described above, and the biomass wastewater treatment method comprises the following steps:

[0016] Discharging the wastewater into the first filtering unit for filtration to obtain sewage and solid impurities;

[0017] Discharging the sewage into the micro-electrolysis cell and performing micro-electrolysis on the sewage to obtain micro-electrolysis effluent;

[0018] Discharging the micro-electrolysis effluent into the coagulation sedimentation tank, adding sodium hydroxide and flocculant to react, reducing the hardness and turbidity of the micro-electrolysis effluent, and obtaining coagulation sedimentation effluent and sludge;

[0019] Discharging the coagulation and sedimentation effluent into the hydrolysis and acidification tank for hydrolysis and acidification, removing part of the suspended solids, and obtaining hydrolysis and acidification effluent and sludge;

[0020] Discharging the hydrolysis-acidified effluent into the anaerobic reactor and the anaerobic-aerobic tank in sequence, so that the microorganisms purify the hydrolysis-acidified effluent to obtain purified effluent;

[0021] Discharging the purified water to the second filtering unit for filtration to obtain filtered water and sludge;

[0022] The filtered water is discharged to the electrodialyzer and the evaporator in sequence for electrodialysis concentration to obtain crystalline salt.

[0023] Beneficial effects of the present invention:

[0024] A biomass wastewater treatment system comprises a first filtering unit, a micro-electrolysis cell, a coagulation sedimentation tank, a hydrolysis acidification tank, an anaerobic reactor, an anaerobic aerobic tank, a second filtering unit, an electrodialyzer and an evaporator, wherein the first filtering unit is used for filtering solid impurities in wastewater; the micro-electrolysis cell is connected to the first filtering unit for micro-electrolysis of wastewater; the coagulation sedimentation tank is connected to the micro-electrolysis cell for sedimentation of wastewater; the hydrolysis acidification tank is connected to the coagulation sedimentation tank; the anaerobic reactor is connected to both the hydrolysis acidification tank and the anaerobic aerobic tank for decomposing organic matter in the wastewater; the second filtering unit is connected to the anaerobic aerobic tank for filtering wastewater outputted from the anaerobic aerobic tank; the electrodialyzer is arranged downstream of the second filtering unit, and the evaporator is connected to the electrodialyzer for extracting salt from the wastewater; the first filtering unit, the micro-electrolysis cell, the coagulation sedimentation tank, the hydrolysis acidification tank, the anaerobic reactor, the anaerobic aerobic tank, the second filtering unit, the electrodialyzer and the evaporator are arranged in sequence along the wastewater discharge direction.

[0025] In this way, biomass wastewater is processed in sequence through multiple processes including physical filtration, internal electrolysis reaction, hydrolysis and acidification, biodegradation, filtration separation, concentration and purification, which reduces the difficulty of treating biomass wastewater. It can not only reduce the organic matter content in the wastewater, make the wastewater meet the discharge standards and reduce pollution to the environment, but also effectively utilize the salt in the wastewater to produce crystalline salt, thereby improving the utilization rate of biomass wastewater. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic structural diagram of a biomass wastewater treatment system in one embodiment of the present invention;

[0027] Figure 2 It is a schematic flow chart of a biomass wastewater treatment method in one embodiment of the present invention.

[0028] In the figure:

[0029] 1. First filter unit; 11. Grid regulating tank; 12. Hydraulic screen; 2. Micro-electrolysis cell; 3. Coagulation sedimentation tank; 4. Hydrolysis acidification tank; 5. Anaerobic reactor; 6. Anaerobic aerobic tank; 7. Second filter unit; 71. Membrane bioreactor; 711. Sludge loop; 72. Nanofiltration; 721. Wastewater loop; 8. Electrodialyzer; 9. Evaporator; 10. Sludge tank. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0031] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0033] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0034] See also Figure 1 In a first aspect, the present invention provides a biomass wastewater treatment system, comprising a first filtration unit 1, a micro-electrolysis cell 2, a coagulation sedimentation tank 3, a hydrolysis acidification tank 4, an anaerobic reactor 5 (UASB, Upflow Anaerobic Sludge Blanket), an anaerobic-aerobic tank 6 (AO, Anaerobic-Oxic), a second filtration unit 7, an electrodialyzer 8 and an evaporator 9 (MVR, Mechanical Vapor Recompression).

[0035] Among them, the first filter unit 1 is used to filter solid impurities in the wastewater; the micro-electrolysis cell 2 is connected to the first filter unit 1 for micro-electrolysis of wastewater; the coagulation and sedimentation tank 3 is connected to the micro-electrolysis cell 2 for sedimentation of wastewater; the hydrolysis and acidification tank 4 is connected to the coagulation and sedimentation tank 3; the anaerobic reactor 5 is connected to the hydrolysis and acidification tank 4 and the anaerobic aerobic tank 6 for decomposing organic matter in the wastewater; the second filter unit 7 is connected to the anaerobic aerobic tank 6 for filtering the wastewater output by the anaerobic aerobic tank 6; the electrodialyzer 8 is arranged downstream of the second filter unit 7, and the evaporator 9 is connected to the electrodialyzer 8 for extracting salt from the wastewater; the first filter unit 1, the micro-electrolysis cell 2, the coagulation and sedimentation tank 3, the hydrolysis and acidification tank 4, the anaerobic reactor 5, the anaerobic aerobic tank 6, the second filter unit 7, the electrodialyzer 8 and the evaporator 9 are arranged in sequence along the wastewater discharge direction.

[0036] It should be noted that the first filtration unit 1 performs preliminary filtration on the wastewater, which can reduce large-particle solid impurities in the wastewater, reduce the burden of subsequent treatment, and improve the operating efficiency and life of the entire system; the micro-electrolysis cell 2 uses iron and carbon as electrode materials and forms a micro-battery to produce an internal electrolysis reaction, thereby destroying the molecular chain hydrocarbon structure of organic matter in the wastewater, and converting the large-molecule organic matter in the wastewater into small-molecule organic matter, so as to improve the biodegradability of the wastewater and facilitate the normal progress of subsequent biological treatment; the coagulation sedimentation tank 3 can precipitate the wastewater to further separate the suspended matter and colloidal substances in the wastewater, and reduce the hardness and turbidity of the wastewater, so as to purify the wastewater quality; the precipitated wastewater is transported from the coagulation sedimentation tank 3 to the hydrolysis acidification tank 4, which further destroys the chain hydrocarbon structure of the high-molecular organic matter, improves the biodegradability, and removes some suspended matter.

[0037] Furthermore, the anaerobic microbial flora in the anaerobic reactor 5 can biochemically degrade the wastewater output from the hydrolysis acidification tank 4, remove or degrade most of the high molecular organic matter and toxic substances, and allow the degraded wastewater to enter the anaerobic aerobic tank 6 for further degradation, remove most of the pollutants in the wastewater, and purify the wastewater.

[0038] The purified wastewater enters the second filtration unit 7, which can further remove organic matter in the wastewater and intercept divalent ions in the wastewater to achieve salt separation, so that the wastewater enters the electrodialyzer 8 and the evaporator 9, evaporates and concentrates the wastewater and extracts the salt in the wastewater, thereby producing crystalline salt.

[0039] In this way, biomass wastewater undergoes physical filtration, internal electrolysis reaction, hydrolysis acidification, biodegradation, filtration separation, concentration and crystallization treatment in sequence, which can reduce the organic matter content in the wastewater and effectively utilize the salt in the wastewater to produce crystalline salt, thereby reducing the difficulty of biomass wastewater treatment, improving the utilization rate of biomass wastewater, and reducing the emission of harmful substances, thereby reducing pollution to the environment.

[0040] It can be understood that flow control devices such as flow valves can be set between the first filter unit 1, the micro-electrolysis cell 2, the coagulation sedimentation tank 3, the hydrolysis acidification tank 4, the anaerobic reactor 5, the anaerobic aerobic tank 6, the second filter unit 7, the electrodialyzer 8 and the evaporator 9 according to actual needs, so as to regulate the treatment efficiency of the biomass wastewater treatment system by controlling the discharge amount of wastewater. This embodiment does not limit this.

[0041] See also Figure 1 In some embodiments, the first filtering unit 1 includes a grid regulating tank 11 and a hydraulic screen 12 . The hydraulic screen 12 is disposed downstream of the grid regulating tank 11 and connected to an input end of the micro-electrolysis cell 2 .

[0042] In this embodiment, the discharge end of the biomass wastewater (not shown in the figure) is connected to the input end of the screen regulating tank 11, so that the screen filters the biomass wastewater to remove large suspended matter and floating objects. The input end of the hydraulic screen 12 is connected to the output end of the screen regulating tank 11, and the sludge separated by the hydraulic screen 12 is discharged to the outside.

[0043] In this way, the screen regulating tank 11 can perform coarse screening on the wastewater, and the hydraulic screen 12 can remove plant fibers in the wastewater, so that impurities such as plant residues, fibers, and suspended matter in the wastewater are removed for subsequent treatment.

[0044] It is understandable that the wastewater can also be filtered through a filter with a filter screen inside, which is not limited to the grid regulating tank 11 and the hydraulic screen 12. It can perform preliminary filtration on the wastewater to remove solid impurities inside, and no more examples are given here.

[0045] See also Figure 1 In some embodiments, the second filtration unit 7 includes a membrane bioreactor 71 (MBR), which is connected to the output end of the anaerobic aerobic tank 6 and is used to filter the wastewater output from the anaerobic aerobic tank 6. In this embodiment, the input end of the membrane bioreactor 71 is connected to the output end of the anaerobic aerobic tank 6, and organic matter is further removed by membrane filtration, so that the organic matter is degraded into carbon dioxide and water.

[0046] In this way, the organic matter in the wastewater output from the anaerobic aerobic tank 6 can be further degraded through the membrane bioreactor 71, reducing the difficulty of biomass wastewater treatment, reducing the organic matter content in the wastewater, and further reducing the interference of organic matter in the subsequent salt extraction process, thereby facilitating improving the utilization rate of biomass wastewater.

[0047] See also Figure 1In some embodiments, the second filtration unit 7 further includes a nanofiltration (NF) 72 , which is disposed downstream of the membrane bioreactor 71 (ie, the output end of the membrane bioreactor 71 is connected to the input end of the nanofiltration 72 ) and connected to the input end of the electrodialyzer 8 .

[0048] In this way, a membrane bioreactor 71 is arranged upstream of the nanofiltration 72, so that the wastewater can meet the water inlet requirements of the nanofiltration 72 after being filtered by the membrane bioreactor 71, thereby improving the wastewater separation efficiency and effect. The nanofiltration 72 can separate the monovalent ions and divalent ions in the wastewater, and intercept the divalent ions in the wastewater, so that the wastewater carrying monovalent ions enters the electrodialysis unit 8 for concentration, thereby increasing the difficulty of treating biomass wastewater.

[0049] See also Figure 1 In some embodiments, the nanofilter 72 is connected to a wastewater loop 721 , and one end of the wastewater loop 721 away from the nanofilter 72 is connected to the micro-electrolysis cell 2 for conveying separated wastewater to the micro-electrolysis cell 2 .

[0050] In this way, the wastewater carrying divalent ions separated by nanofiltration 72 can return to the micro-electrolysis cell 2 to continue to participate in the reaction, and enter the coagulation sedimentation tank 3 for precipitation before being discharged to the outside, thereby improving the wastewater treatment efficiency, reducing the difficulty of wastewater treatment, and effectively utilizing the salt in the wastewater, thereby improving the utilization rate of biomass wastewater.

[0051] It can be understood that the wastewater loop 721 can also be directly connected to the outside world so that the separated divalent ions are discharged to the outside world. In this embodiment, the output end of the wastewater loop 721 is connected to the micro-electrolysis cell 2, which can further control the discharge of wastewater and fully treat the organic matter in the wastewater, thereby reducing the organic matter discharged to the outside world, thereby reducing the pollution to the external environment and reducing the difficulty of biomass wastewater treatment.

[0052] See also Figure 1 In some embodiments, the biomass wastewater treatment system further includes a sludge tank 10, and the sludge tank 10 is connected to the coagulation sedimentation tank 3, the hydrolysis acidification tank 4, the anaerobic reactor 5, the anaerobic aerobic tank 6, and the membrane bioreactor 71 through pipelines.

[0053] In this way, organic matter and impurities precipitated or degraded in the coagulation sedimentation tank 3, hydrolysis acidification tank 4, anaerobic reactor 5, anaerobic aerobic tank 6, and membrane bioreactor 71 can be transported to the sludge tank 10 through pipelines, which is conducive to centralized treatment of sludge and reduces the difficulty of biomass wastewater treatment.

[0054] It is understandable that the screen regulating tank 11 and the hydraulic screen 12 can also be connected to the sludge tank 10 according to actual needs, and no more details are given here.

[0055] See also Figure 1In some embodiments, the membrane bioreactor 71 is connected to a sludge loop 711 , which is connected to the anaerobic aerobic tank 6 for transferring at least part of the sludge in the membrane bioreactor 71 to the anaerobic aerobic tank 6 .

[0056] The sludge output end of the membrane bioreactor 71 is divided into two paths, one path is connected to the sludge tank 10 , and the other path is connected to the anaerobic aerobic tank 6 , so that part of the sludge returns to the inside of the anaerobic aerobic tank 6 and the other part of the sludge enters the sludge tank 10 .

[0057] Furthermore, the anaerobic aerobic tank 6 includes an anoxic tank (not shown in the figure) and an aerobic tank (not shown in the figure), and the sludge circuit 711 is connected to the anoxic tank.

[0058] In this way, the sludge filtered by the membrane bioreactor 71 contains rich microbial communities, which can promote nitrification and denitrification processes, thereby helping to remove ammonia nitrogen and nitrite nitrogen in the wastewater. Under anaerobic conditions, denitrifying bacteria can use organic matter to reduce nitrates to nitrogen gas, increase the biomass in the system, improve the stability of the entire biomass wastewater treatment system, reduce the difficulty of biomass wastewater treatment, and effectively utilize organic matter in biomass wastewater to improve the utilization rate of biomass wastewater.

[0059] It is understandable that if the sludge produced by the membrane bioreactor 71 enters the anoxic tank through the sludge loop, it may increase the degradation burden of the microorganisms in the anoxic tank, thereby reducing the treatment efficiency of the biomass wastewater. Therefore, the sludge loop 711 may also be provided with a flow control device such as a flow valve to control the amount of sludge flowing into the anoxic tank, so that the microorganisms in the anoxic tank are at the highest level of degradation efficiency, and the remaining sludge is discharged into the sludge tank 10 for treatment.

[0060] See also Figure 2 In a second aspect, the present invention further provides a biomass wastewater treatment method, which is applied to a biomass wastewater treatment system. The biomass wastewater treatment method comprises the following steps:

[0061] S1, discharging wastewater into the first filtering unit 1 for filtering to obtain sewage and solid impurities;

[0062] S2, discharging the sewage into the micro-electrolysis cell 2, and performing micro-electrolysis on the sewage to obtain micro-electrolysis effluent;

[0063] S3, discharging the micro-electrolysis effluent into the coagulation sedimentation tank 3, adding sodium hydroxide and flocculant to react, reducing the hardness and turbidity of the micro-electrolysis effluent, and obtaining coagulation sedimentation effluent and sludge;

[0064] S4, discharging the coagulation and sedimentation effluent into the hydrolysis and acidification tank 4 for hydrolysis and acidification, removing part of the suspended solids, and obtaining hydrolysis and acidification effluent and sludge;

[0065] S5, discharging the hydrolysis and acidification effluent to the anaerobic reactor 5 and the anaerobic aerobic tank 6 in sequence, so that the microorganisms purify the hydrolysis and acidification effluent to obtain purified effluent;

[0066] S6, discharging the purified water to the second filtering unit 7 for filtration to obtain filtered water and sludge;

[0067] S7, the filtered water is discharged to the electrodialyzer 8 and the evaporator 9 in sequence for electrodialysis concentration to obtain crystalline salt.

[0068] In step S1, the wastewater first passes through the screen regulating tank 11 to filter out large solid impurities, and then passes through the hydraulic screen 12 to filter out smaller solid impurities such as plant fibers. The solid impurities filtered out by the hydraulic screen 12 are discharged to the outside.

[0069] In step S3, the flocculant is polyacrylamide (PAM) or polyaluminium chloride (PAC).

[0070] In step S6, the wastewater first passes through the membrane bioreactor 71 to filter out some organic matter, and enters the nanofiltration 72 to separate monovalent ions and divalent ions. Part of the sludge obtained by filtering the wastewater in the membrane bioreactor 71 is returned to the anoxic tank through the sludge loop 711 to continue the reaction, and the divalent ion wastewater obtained after the wastewater is filtered through the nanofiltration 72 is returned to the micro-electrolysis cell 2 for internal electrolysis reaction.

[0071] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A biomass wastewater treatment system, characterized in that: include: A first filtering unit (1) is used to filter solid impurities in the wastewater; A micro-electrolysis cell (2), the micro-electrolysis cell (2) being connected to the first filtering unit (1) and being used for micro-electrolysis of wastewater; A coagulation sedimentation tank (3), the coagulation sedimentation tank (3) is connected to the micro-electrolysis cell (2) and is used for sedimentation of wastewater; A hydrolysis acidification tank (4), wherein the hydrolysis acidification tank (4) is connected to the coagulation sedimentation tank (3); An anaerobic reactor (5) and an anaerobic aerobic tank (6), wherein the anaerobic reactor (5) is connected to the hydrolysis acidification tank (4) and the anaerobic aerobic tank (6) and is used to decompose organic matter in the wastewater; A second filtering unit (7), the second filtering unit (7) is connected to the anaerobic aerobic tank (6) and is used to filter the wastewater output from the anaerobic aerobic tank (6); an electrodialyser (8) and an evaporator (9), wherein the electrodialyser (8) is disposed downstream of the second filtering unit (7), and the evaporator (9) is connected to the electrodialyser (8) and is used to extract salt from the wastewater; The first filter unit (1), the micro-electrolysis cell (2), the coagulation sedimentation tank (3), the hydrolysis acidification tank (4), the anaerobic reactor (5), the anaerobic aerobic tank (6), the second filter unit (7), the electrodialyzer (8) and the evaporator (9) are arranged in sequence along the wastewater discharge direction.

2. The biomass wastewater treatment system according to claim 1, characterized in that: The first filtering unit (1) comprises a grid regulating tank (11) and a hydraulic screen (12); the hydraulic screen (12) is arranged downstream of the grid regulating tank (11) and connected to the input end of the micro-electrolysis cell (2).

3. The biomass wastewater treatment system according to claim 1, characterized in that: The second filtering unit (7) comprises a membrane bioreactor (71), and the membrane bioreactor (71) is connected to the output end of the anaerobic aerobic tank (6) and is used to filter the wastewater output from the anaerobic aerobic tank (6).

4. The biomass wastewater treatment system according to claim 3, characterized in that: The second filtration unit (7) further comprises a nanofilter (72), wherein the nanofilter (72) is arranged downstream of the membrane bioreactor (71) and connected to the input end of the electrodialyzer (8).

5. The biomass wastewater treatment system according to claim 4, characterized in that: The nanofilter (72) is connected to a wastewater circuit (721), and one end of the wastewater circuit (721) away from the nanofilter (72) is connected to the micro-electrolysis cell (2) for conveying separated wastewater to the micro-electrolysis cell (2).

6. The biomass wastewater treatment system according to claim 3, characterized in that: The biomass wastewater treatment system further comprises a sludge tank (10), wherein the sludge tank (10) is connected to the membrane bioreactor (71).

7. The biomass wastewater treatment system according to claim 3, characterized in that: The membrane bioreactor (71) is connected to a sludge loop (711), and the sludge loop (711) is connected to the anaerobic aerobic tank (6) for conveying at least part of the sludge in the membrane bioreactor (71) to the anaerobic aerobic tank (6).

8. The biomass wastewater treatment system according to claim 7, characterized in that: The anaerobic aerobic tank (6) includes an anoxic tank and an aerobic tank, and the sludge circuit (711) is connected to the anoxic tank.

9. The biomass wastewater treatment system according to claim 1, characterized in that: The biomass wastewater treatment system further comprises a sludge tank (10), and the coagulation sedimentation tank (3), the hydrolysis acidification tank (4), and the anaerobic reactor (5) are all connected to the sludge tank (10).

10. A method for treating biomass wastewater, characterized in that: Applied to the biomass wastewater treatment system according to any one of claims 1 to 9, the biomass wastewater treatment method comprises the following steps: Discharging the wastewater into the first filtering unit (1) for filtering to obtain sewage and solid impurities; Discharging the sewage into the micro-electrolysis cell (2), and performing micro-electrolysis on the sewage to obtain micro-electrolysis effluent; Discharging the micro-electrolysis effluent into the coagulation sedimentation tank (3), adding sodium hydroxide and flocculant to react, reducing the hardness and turbidity of the micro-electrolysis effluent, and obtaining coagulation sedimentation effluent and sludge; Discharging the coagulation and sedimentation effluent into the hydrolysis and acidification tank (4) for hydrolysis and acidification, removing part of the suspended solids, and obtaining hydrolysis and acidification effluent and sludge; Discharging the hydrolysis and acidification effluent into the anaerobic reactor (5) and the anaerobic aerobic tank (6) in sequence, so that the hydrolysis and acidification effluent is purified by microorganisms to obtain purified effluent; Discharging the purified water to the second filtering unit (7) for filtration to obtain filtered water and sludge; The filtered water is discharged to the electrodialyzer (8) and the evaporator (9) in sequence for electrodialysis concentration to obtain crystalline salt.

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