A device and method for treating brewing wastewater.

Abstract

This invention discloses a treatment device and method for brewing wastewater. The treatment device includes: a bar screen, a sedimentation tank, an equalization tank, a coagulation sedimentation tank, a first intermediate water tank, an anaerobic reactor, a second intermediate water tank, a pure membrane aerobic biofilm coupled granular sludge reactor, a third intermediate water tank, and an ozone oxidation tank. The pure membrane aerobic biofilm coupled granular sludge reactor is equipped with a pure membrane moving bed biofilm reaction zone, a water and gas distribution zone, and a granular sludge reaction zone. The granular sludge reaction zone is further divided into an aerobic granular sludge reaction zone and an anaerobic granular sludge reaction zone. The physical space of the aerobic and anaerobic granular sludge reaction zones is controlled by a reaction zone space control unit. This invention can simultaneously perform aerobic and anaerobic biological treatment of wastewater and can flexibly control the physical space of the sludge reaction zone, greatly shortening the biological treatment process of brewing wastewater and significantly improving the reactor's adaptability to changes in wastewater characteristics, thereby enhancing the wastewater treatment effect.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a treatment device and method for brewing wastewater. Background Technology

[0002] Brewing wastewater contains high concentrations of organic pollutants, including starch, protein, amino acids, sugars, and toxic and recalcitrant organic matter. It is characterized by high chemical oxygen demand (COD), biochemical oxygen demand (BOD), suspended solids (SS), and high concentrations of ammonia nitrogen (NH3-N), total nitrogen (TN), and total phosphorus (TP), making treatment very challenging. Biological treatment technologies, especially coupled anaerobic and aerobic biological treatment processes, have become the most important technical choice for brewing wastewater treatment and are widely used in practice. These technologies are characterized by high efficiency and good treatment effects, significantly reducing the pollution load of the wastewater. However, generally, because brewing wastewater has an extremely high organic pollution load, a combination of multiple anaerobic and aerobic biological treatment processes (e.g., 3-6 stages) is required to achieve good treatment results. Existing anaerobic and aerobic biological treatment processes need to be carried out in different reactors, which not only increases the complexity of process control but also significantly increases investment costs, operation and maintenance expenses, and land area requirements.

[0003] In addition, among existing biological wastewater treatment technologies, the activated sludge process is one of the core technologies. However, the activated sludge process suffers from low sludge concentration, low volumetric loading, poor resistance to shock loads, unstable sludge settling performance, and high excess sludge yield. The excess biological sludge generated during wastewater treatment causes serious secondary pollution and must undergo harmless treatment, stabilization, volume reduction, and resource recovery. The treatment and disposal costs of excess sludge are relatively high. Summary of the Invention

[0004] To overcome the defects and shortcomings of existing technologies, this invention provides a treatment device and method for brewing wastewater. This invention utilizes a pure membrane aerobic biofilm coupled with granular sludge reactors, in which aerobic biofilm, aerobic granular sludge, and anaerobic granular sludge are arranged. This allows for simultaneous aerobic and anaerobic biological treatment of wastewater within a single reactor. Furthermore, the physical spaces of the aerobic and anaerobic granular sludge reaction zones can be flexibly adjusted as needed, significantly shortening the biological treatment process for brewing wastewater, greatly reducing the footprint, and significantly improving the reactor's adaptability to changes in wastewater characteristics, thus enhancing the treatment effect. Simultaneously, the pure membrane aerobic biofilm coupled with granular sludge reactor of this invention features high sludge concentration, low residual sludge yield, good effluent quality, strong adaptability, and a simple and compact design, greatly improving wastewater treatment efficiency.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This invention provides a treatment device for brewing wastewater, comprising: a bar screen, a sedimentation tank, an equalization tank, a coagulation sedimentation tank, a first intermediate water tank, an anaerobic reactor, a second intermediate water tank, a pure membrane aerobic biofilm coupled granular sludge reactor, a third intermediate water tank, and an ozone oxidation tank.

[0007] The outlet of the bar screen is connected to the inlet of the sedimentation tank, the outlet of the sedimentation tank is connected to the inlet of the equalization tank, the outlet of the equalization tank is connected to the first pipeline mixer via the first inlet pump, the first pipeline mixer contains coagulant and is connected to the second pipeline mixer, the second pipeline mixer contains flocculant and is connected to the inlet of the coagulation sedimentation tank, the outlet of the coagulation sedimentation tank is connected to the inlet of the first intermediate water tank, the outlet of the first intermediate water tank is connected to the anaerobic reactor via the second inlet pump, the outlet of the anaerobic reactor is connected to the inlet of the second intermediate water tank, the outlet of the second intermediate water tank is connected to the pure membrane aerobic biofilm coupled granular sludge reactor via the third inlet pump, the outlet of the pure membrane aerobic biofilm coupled granular sludge reactor is connected to the inlet of the third intermediate water tank, and the outlet of the third intermediate water tank is connected to the ozone oxidation tank via the fourth inlet pump.

[0008] The pure membrane aerobic biofilm coupled granular sludge reactor is provided with a pure membrane moving bed biofilm reaction zone, a water and air distribution zone, and a granular sludge reaction zone. The pure membrane moving bed biofilm reaction zone is connected to the water and air distribution zone, and the water and air distribution zone is connected to the granular sludge reaction zone. The pure membrane moving bed biofilm reaction zone is provided with a medium material and an aeration system. A pure membrane aerobic biofilm is cultivated on the medium material. The granular sludge reaction zone is provided with an aerobic granular sludge reaction zone and an anaerobic granular sludge reaction zone.

[0009] A reaction zone space control unit is also provided, which is used to control the physical space of the aerobic granular sludge reaction zone and the anaerobic granular sludge reaction zone, specifically including:

[0010] The reaction zone space control unit controls the filling rate of the medium material in the pure membrane moving bed biofilm reaction zone by changing the amount of medium material, thereby controlling the sludge concentration in the pure membrane moving bed biofilm reaction zone and the dissolved oxygen concentration in the granular sludge reaction zone.

[0011] And / or, the reaction zone space control unit controls the dissolved oxygen concentration in the pure membrane moving bed biofilm reaction zone and the aerobic granular sludge reaction zone by regulating the aeration rate of the aeration system.

[0012] As a preferred technical solution, the granular sludge reaction zone is equipped with a support plate;

[0013] The water and air distribution area is equipped with a water distribution system, an air distribution system, and a water distributor. The air distribution system is connected to a first blower and is located on one side of the water distribution system. The water distributor is located on a support plate.

[0014] As a preferred technical solution, the pure membrane moving bed biofilm reaction zone is also provided with an inlet, a circulating outlet, and a drain outlet.

[0015] The inlet is connected to an inlet pump, through which wastewater enters the biofilm reaction zone of the pure membrane moving bed. The circulating outlet is connected to a circulating inlet pump, and the circulating outlet is connected to the inlet of the circulating inlet pump. The outlet of the circulating inlet pump is connected to the water distribution system. The drain outlet is used to discharge a set proportion of wastewater.

[0016] As a preferred technical solution, the granular sludge reaction zone is further provided with a biological carrier bed and a first limiting plate. The biological carrier bed is set on the support plate, and the interval between the biological carrier bed and the first limiting plate forms an expansion space.

[0017] As a preferred technical solution, the volume of the expansion space is 1 / 50 to 1 / 20 of the volume of the biological carrier bed.

[0018] As a preferred technical solution, the biological carrier bed is provided with biological carriers dispersedly, with a biological membrane on the outer ring of the biological carriers and a separator strip on the inner ring of the biological carriers;

[0019] The biological carrier in the aerobic granular sludge reaction zone contains aerobic granular sludge, while the biological carrier in the anaerobic granular sludge reaction zone contains anaerobic granular sludge.

[0020] As a preferred technical solution, the medium material in the biofilm reaction zone of the pure membrane moving bed and the biological carrier in the granular sludge reaction zone both use materials with a density of less than 1 g / cm³. 3 Specific surface area greater than 500m² 2 / m 3 Hollow particle fillers with porosity between 95% and 98%.

[0021] As a preferred technical solution, the biofilm reaction zone of the pure membrane moving bed is further provided with a second limiting plate;

[0022] The second limiting plate is a perforated plate, and the size of the through holes on the second limiting plate is smaller than the size of the medium material.

[0023] As a preferred technical solution, a circulation reflux zone is also provided, wherein the circulation reflux zone is provided with an outlet tank, the outlet tank is provided with a circulation reflux port, and the circulation reflux port is connected to the biofilm reaction zone of the pure membrane moving bed.

[0024] The present invention also provides a treatment method based on the above-mentioned brewing wastewater treatment device, comprising the following steps:

[0025] Pretreatment: The brewing wastewater passes through a bar screen and sedimentation tank to remove impurities, and then enters a regulating tank for equalization of water quality and quantity.

[0026] Coagulation and sedimentation treatment: Coagulant is added when the pretreated wastewater passes through the first pipeline mixer and flocculant is added when it passes through the second pipeline mixer. The mixture is then introduced into the coagulation and sedimentation tank for coagulation reaction. After the coagulation reaction, the wastewater undergoes mud-water separation in the coagulation and sedimentation tank, and the supernatant is extracted and introduced into the first intermediate water tank.

[0027] Biological treatment: Nutrients are added to the first intermediate tank, and the pH is adjusted with alkaline and acidic solutions. The wastewater then enters an anaerobic reactor for anaerobic treatment, followed by a pure membrane aerobic biofilm coupled granular sludge reactor for anaerobic-aerobic coupled biochemical oxidation treatment. Specifically, this includes:

[0028] The wastewater from the first intermediate water tank enters the anaerobic reactor for anaerobic treatment and then enters the second intermediate water tank. Nutrients are added to the second intermediate water tank, and the pH value is adjusted with alkaline and acidic solutions. The wastewater then enters the pure membrane aerobic biofilm coupled granular sludge reactor for treatment.

[0029] Wastewater enters the pure membrane moving bed biofilm reaction zone of the pure membrane aerobic biofilm coupled granular sludge reactor. The wastewater in the pure membrane moving bed biofilm reaction zone is transported to the water and air distribution zone and then enters the granular sludge reaction zone. When the granular sludge reaction zone is full of wastewater and the wastewater in the pure membrane moving bed biofilm reaction zone reaches the set water level, the water intake is stopped.

[0030] After the water intake is completed, the wastewater in the pure membrane moving bed biofilm reaction zone is aerated through the aeration system. The biofilm on the medium material in the pure membrane moving bed biofilm reaction zone performs biochemical treatment on the wastewater. The aerated wastewater is then transported to the water and air distribution zone.

[0031] Wastewater passes sequentially through the aerobic granular sludge reaction zone and the anaerobic granular sludge reaction zone, maintaining the flow rate of the wastewater. After biochemical oxidation treatment, the wastewater is recycled, passing sequentially through the pure membrane moving bed biofilm reaction zone, the water and gas distribution zone, the aerobic granular sludge reaction zone, and the anaerobic granular sludge reaction zone.

[0032] After the recycling process is complete, the wastewater in the set proportion will be discharged.

[0033] The biogas produced by the anaerobic reactor and the biogas produced by the anaerobic granular sludge reaction zone are purified and then utilized.

[0034] The granular sludge reaction zone is backwashed, and the backwashed wastewater is transported to the equalization tank and coagulated and settled together with the pretreated wastewater.

[0035] Ozone oxidation: After biological treatment, the wastewater enters the third intermediate water tank, where an ozone catalyst is added. The wastewater is then transported to the ozone oxidation tank for catalytic ozone oxidation treatment. The treated wastewater is then discharged from the reactor, completing the treatment process for brewing wastewater.

[0036] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0037] (1) This invention sets up a pure membrane moving bed biofilm reaction zone in a pure membrane aerobic biofilm coupled granular sludge reactor, and designs and controls the granular sludge reaction zone in a partitioned manner. Aerobic granular sludge and anaerobic granular sludge are set up in the granular sludge reaction zone of the reactor at the same time, realizing the simultaneous aerobic biological treatment and anaerobic biological treatment process in one reactor. This is conducive to the efficient degradation and removal of organic pollutants in brewing wastewater, as well as nitrogen and phosphorus removal, thereby achieving significant treatment effect and greatly shortening the wastewater treatment process.

[0038] (2) By regulating the aeration system and dissolved oxygen concentration of the pure membrane aerobic biofilm coupled granular sludge reactor, the present invention can flexibly regulate the physical space of the aerobic granular sludge zone and the anaerobic granular sludge zone in the granular sludge reaction zone as needed, which significantly improves the reactor's adaptability to changes in wastewater characteristics, effectively improves the utilization rate of dissolved oxygen, and enhances the treatment effect.

[0039] (3) By setting the aeration system in the pure membrane moving bed biofilm reaction zone and not setting suspended sludge in the pure membrane moving bed biofilm reaction zone, the present invention solves the problem of easy clogging of the aeration system that is common in biological treatment systems, and the aeration system is easy to maintain; at the same time, in addition to the function of treating wastewater, the pure membrane moving bed biofilm reaction zone also has the function of diluting and balancing water quality, which is conducive to improving wastewater treatment efficiency.

[0040] (4) The anaerobic reactor and the pure membrane aerobic biofilm coupled granular sludge reactor of the present invention have high sludge concentrations. The sludge concentration of the anaerobic reactor reaches 30-40 g / L, while the granular sludge reaction zone is equipped with both aerobic and anaerobic granular sludge, with a sludge concentration of 20-45 g / L. The pure membrane moving bed biofilm reaction zone is equipped with a biofilm, with a sludge concentration of 8-15 g / L, which is higher than the sludge concentration of the currently commonly used activated sludge process and biofilm process. The high sludge concentration ensures good wastewater treatment results, but it is also the inherent reason for the low sludge yield in the wastewater treatment process.

[0041] (5) The sludge yield of the present invention is low, and the residual sludge yield during the wastewater treatment process is less than 0.15 kgTSS / kgCOD, which is more than 60% lower than the residual sludge yield of the activated sludge method, and greatly reduces the frequency of backwashing operations compared with commonly used aerated biological filters.

[0042] (6) The wastewater treatment device of the present invention is simple, compact, efficient, flexible and adaptable. The wastewater treatment process is short and the area occupied is small. At the same time, when the wastewater passes through the biological carrier bed in the granular sludge reaction zone, the suspended solids in the wastewater are adsorbed and intercepted by microorganisms, and then decomposed and degraded. Therefore, the concentration of suspended solids in the wastewater is very low after treatment, the effluent quality is stable, and a secondary sedimentation tank is not required. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the overall structure of the brewing wastewater treatment device of the present invention;

[0044] Figure 2 This is a schematic diagram of the structure of the pure membrane aerobic biofilm coupled granular sludge reactor of the present invention;

[0045] Figure 3 for Figure 2 A magnified view of a portion of the biological carrier bed at point I;

[0046] Figure 4 (a) is a schematic diagram of the aerobic granular sludge morphology in the aerobic granular sludge reaction zone of the pure membrane aerobic biofilm coupled granular sludge reactor of the present invention.

[0047] Figure 4 (b) is a schematic diagram of the anaerobic granular sludge morphology in the anaerobic granular sludge reaction zone of the pure membrane aerobic biofilm coupled granular sludge reactor of the present invention.

[0048] Among them, 1-inlet, 2-circulating water pump, 3-backwash drain, 4-first blower, 5-aeration system, 6-water distribution system, 7-support plate, 8-water distributor, 9-biological carrier bed, 10-drain, 11-expansion space, 12-first limiting plate, 13-aeration system, 14-second blower, 15-circulating water outlet, 16-pipeline, 17-second limiting plate, 18-water outlet tank, 19-circulating return port, 20-sealing flange, 21-third inlet pump, 22-medium material, 23-the... 1 - Dissolved oxygen detector; 24 - Second dissolved oxygen detector; 25 - Third dissolved oxygen detector; 26 - Bar screen tank; 27 - Sedimentation tank; 28 - Equalization tank; 29 - First inlet pump; 301 - First pipeline mixer; 302 - Second pipeline mixer; 31 - Coagulation sedimentation tank; 32 - First intermediate water tank; 33 - Second inlet pump; 34 - Anaerobic reactor; 35 - Second intermediate water tank; 36 - Third intermediate water tank; 37 - Fourth inlet pump; 38 - Ozone oxidation tank; 39 - Ozone diffuser; 40 - Ozone quencher. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0050] Example 1

[0051] like Figure 1 As shown, this embodiment provides a brewing wastewater treatment device, including: a bar screen 26, a sedimentation tank 27, an equalization tank 28, a coagulation sedimentation tank 31, a first intermediate water tank 32, an anaerobic reactor 34, a second intermediate water tank 35, a pure membrane aerobic biofilm coupled granular sludge reactor, a third intermediate water tank 36, and an ozone oxidation tank 38.

[0052] The outlet of the bar screen 26 is connected to the inlet of the sedimentation tank 27. The outlet of the sedimentation tank 27 is connected to the inlet of the equalization tank 28. The outlet of the equalization tank 28 is connected to the first pipeline mixer 301 via the first inlet pump 29. The first pipeline mixer 301 contains coagulant and is connected to the second pipeline mixer 302. The second pipeline mixer contains flocculant and is connected to the inlet of the coagulation sedimentation tank 31. The outlet of the coagulation sedimentation tank 31 is connected to the inlet of the first intermediate water tank 32. The outlet of the first intermediate water tank 32 is connected to the anaerobic reactor 34 via the second inlet pump 33. The outlet of the anaerobic reactor 34 is connected to the inlet of the second intermediate water tank 35. The outlet of the second intermediate water tank 35 is connected to the pure membrane aerobic biofilm coupled granular sludge reactor via the third inlet pump 21. The outlet of the pure membrane aerobic biofilm coupled granular sludge reactor is connected to the inlet of the third intermediate water tank 36. The outlet of the third intermediate water tank 36 is connected to the ozone oxidation tank 38 via the fourth inlet pump 37.

[0053] like Figure 2 As shown, the pure membrane aerobic biofilm coupled granular sludge reactor is arranged in sequence along the wastewater movement direction, with a pure membrane moving bed biofilm reaction zone A and a granular sludge reaction zone C.

[0054] Wastewater enters the pure membrane moving bed biofilm reaction zone A of the reactor through inlet 1. The pure membrane moving bed biofilm reaction zone A is equipped with a pure membrane aerobic biofilm. The granular sludge reaction zone C is arranged in sequence with aerobic granular sludge reaction zone C1 and anaerobic granular sludge reaction zone C2 along the direction of wastewater movement. Aerobic granular sludge reaction zone C1 is equipped with aerobic granular sludge, and anaerobic granular sludge reaction zone C2 is equipped with anaerobic granular sludge.

[0055] The pure membrane moving bed biofilm reaction zone A, the aerobic granular sludge reaction zone C1, and the anaerobic granular sludge reaction zone C2 are respectively equipped with a first dissolved oxygen detector 23, a second dissolved oxygen detector 24, and a third dissolved oxygen detector 25 to monitor the dissolved oxygen concentration in the pure membrane moving bed biofilm reaction zone A, the aerobic granular sludge reaction zone C1, and the anaerobic granular sludge reaction zone C2.

[0056] In this embodiment, a reaction zone space control unit is also provided, which flexibly controls the physical space of the aerobic granular sludge reaction zone C1 and the anaerobic granular sludge reaction zone C2, which are arranged sequentially along the wastewater flow direction, according to the wastewater characteristics and treatment effect, by controlling the aeration system and dissolved oxygen concentration.

[0057] Specifically, the reaction zone space control unit can adjust the filling rate of the medium material in the pure membrane moving bed biofilm reaction zone by changing the amount of medium material, thereby adjusting the amount of biofilm, and thus controlling the sludge concentration in the pure membrane moving bed biofilm reaction zone, and the dissolved oxygen concentration in the granular sludge reaction zone, so as to achieve the purpose of flexibly controlling the physical space of the aerobic granular sludge reaction zone C1 and the anaerobic granular sludge reaction zone C2.

[0058] In this embodiment, increasing the filling rate of the medium material in the pure membrane moving bed biofilm reaction zone will increase the sludge concentration in the pure membrane moving bed biofilm reaction zone. Consequently, the pure membrane moving bed biofilm reaction zone will consume more dissolved oxygen. Therefore, under the same aeration conditions, the dissolved oxygen concentration in the aerobic granular sludge reaction zone C1 will decrease, achieving the goal of reducing the physical space of the aerobic granular sludge reaction zone C1 while increasing the physical space of the anaerobic granular sludge reaction zone C2. For wastewater with a high organic pollution load, by taking such measures to reduce the physical space of the aerobic granular sludge reaction zone C1 and increase the physical space of the anaerobic granular sludge reaction zone C2, the aeration volume can be reduced, biogas production increased, energy recovery increased, and the degradation and removal efficiency of pollutants in the pure membrane moving bed biofilm reaction zone improved, thereby effectively improving the wastewater treatment effect.

[0059] In addition, the reaction zone space control unit can also flexibly control the physical space of the aerobic granular sludge reaction zone C1 and the anaerobic granular sludge reaction zone C2 by controlling the aeration system.

[0060] Dissolved oxygen concentration can also be controlled by adjusting the aeration system, specifically the aeration rate. For example, with aeration rates of 10 L / min and 50 L / min, the dissolved oxygen concentrations in the biofilm reaction zone of the pure membrane moving bed and the aerobic granular sludge reaction zone C1 will differ, thus achieving flexible control over the physical space of the aerobic granular sludge reaction zone C1 and the anaerobic granular sludge reaction zone C2.

[0061] Specifically, by reducing the aeration rate and lowering the dissolved oxygen concentration, the physical space of the aerobic granular sludge reaction zone C1 can be reduced, while the physical space of the anaerobic granular sludge reaction zone C2 can be increased, and vice versa. This adapts to changes in the characteristics and treatment requirements of the wastewater being treated, achieving better treatment results.

[0062] In this embodiment, the pure membrane aerobic biofilm coupled granular sludge reactor is also provided with a water and gas distribution zone B, a circulation reflux zone D, and a biogas collection zone E.

[0063] Water and air distribution area B is equipped with water distribution system 6, air distribution system 5, and water distributor 8. The first blower 4 is connected to the air distribution system 5. The air distribution system 5 is located on one side of the water distribution system 6. The water distributor 8 is installed on the support plate 7.

[0064] In this embodiment, the water and gas distribution zone B is also equipped with a backwash drain 3. After the reactor has treated wastewater for a period of time, the biological carrier can be backwashed through the gas distribution system 5, and the wastewater after backwashing can be discharged from the reactor through the backwash drain 3.

[0065] The circulating return zone D is equipped with a water outlet trough 18;

[0066] The biogas collection area E is equipped with a sealing flange 20 and a biogas collection and utilization system. The sealing flange 20 is connected to the water outlet 18, and the biogas collection and utilization system is used to recover the biogas generated by the water outlet 18.

[0067] In this embodiment, the biofilm reaction zone A of the pure membrane moving bed is provided with a medium material 22, an aeration system 13, a circulating water outlet 15, a circulating water pump 2, and a second limiting plate 17.

[0068] The aeration system 13 is connected to the second blower 14, the circulating water outlet 15 is connected to the inlet of the circulating water pump 2, the outlet of the circulating water pump 2 is connected to the water distribution system 6, the water outlet 18 is provided with a circulating return port 19, and the circulating return port 19 is connected to the pure membrane moving bed biofilm reaction zone A through the pipe 16.

[0069] A pure membrane aerobic biofilm was formed on the medium material 22, and the biofilm formed on the medium material 22 was used to treat wastewater.

[0070] The second limiting plate 17 is a perforated plate, and the size of the through hole on the second limiting plate 17 is smaller than the size of the medium material 22.

[0071] Furthermore, no suspended sludge is set in the biofilm reaction zone A of the pure membrane moving bed.

[0072] In this embodiment, the granular sludge reaction zone C is provided with a support plate 7, a biological carrier bed 9 and a first limiting plate 12. The biological carrier bed 9 is disposed on the support plate 7, and the interval between the biological carrier bed 9 and the first limiting plate 12 forms an expansion space 11. The maximum volume of the expansion space 11 is 1 / 10 of the volume of the biological carrier bed 9. In this embodiment, it is preferred that the volume of the expansion space 11 is 1 / 50-1 / 20 of the volume of the biological carrier bed 9.

[0073] The biological carrier bed 9 is dispersed with biological carriers, and the biological carrier bed 9 is arranged with an aerobic granular sludge reaction zone C1 and an anaerobic granular sludge reaction zone C2 in sequence along the direction of wastewater flow.

[0074] In this embodiment, the biofilm reaction zone A of the pure membrane moving bed is also equipped with a third water inlet pump 21 and a drain outlet 10. The third water inlet pump 21 is connected to the water inlet 1. The third water inlet pump 21 works with the circulating water inlet pump 2 to regulate the wastewater flow rate. The wastewater from the third water inlet pump 21 is mixed with the return water from the circulating water inlet pump 2 and transported to the water distribution system 6. A certain proportion of the wastewater is discharged through the drain outlet 10.

[0075] In this embodiment, the aerobic granular sludge reaction zone C1 has aerobic granular sludge in the inner ring of the biological carrier, a biofilm in the outer ring, and a separator in the inner ring; the anaerobic granular sludge reaction zone C2 has anaerobic granular sludge in the inner ring of the biological carrier, a biofilm in the outer ring, and a separator in the inner ring.

[0076] In this embodiment, the upward flow velocity of wastewater in the biological carrier bed 9 is set at 1.5-15 mm / s; the medium material in the biofilm reaction zone A of the pure membrane moving bed and the biological carrier in the granular sludge reaction zone C both use materials with a density of less than 1 g / cm³. 3 Specific surface area greater than 500m² 2 / m 3 Hollow particle fillers with porosity between 95% and 98%;

[0077] like Figure 3 As shown, the biological carrier is in a slightly expanded state during wastewater treatment and is randomly distributed within the granular sludge reaction zone C; for example... Figure 4 As shown in (a), the inner ring of the aerobic granular sludge reaction zone C1 contains aerobic granular sludge, and the outer ring contains a biofilm; as... Figure 4 As shown in (b), the inner circle of the biological carrier in the anaerobic granular sludge reaction zone C2 is filled with black anaerobic granular sludge, and the outer circle is filled with biofilm; the inner circle of the biological carrier is filled with partition strips, which can be multiple, such as 3 or 5, and can be in the shape of cross, cross, etc.

[0078] After the sludge acclimation in the reactor is completed, both aerobic and anaerobic granular sludge are generated in the granular sludge reaction zone C, while a biofilm forms on the surface of the biological carrier. The formation of granular sludge is the main reason for the high sludge concentration in the reactor. The high concentration of granular sludge and biofilm in the reactor ensures good wastewater treatment results.

[0079] The anaerobic reactor and the pure membrane aerobic biofilm coupled granular sludge reactor of this invention have high sludge concentrations. The anaerobic reactor has a sludge concentration of 30-40 g / L, while the granular sludge reaction zone simultaneously contains aerobic and anaerobic granular sludge, with a sludge concentration of 20-45 g / L. The pure membrane moving bed biofilm reaction zone contains a biofilm, with a sludge concentration of 8-15 g / L, which is higher than the sludge concentrations of commonly used activated sludge and biofilm processes. This high sludge concentration ensures good wastewater treatment results, but it is also the underlying reason for the low sludge yield in the wastewater treatment process.

[0080] In this embodiment, the support plate 7 is a porous plate, and water distributors 8 are evenly distributed on the through holes of the support plate 7. After passing through the water distributors 8, the wastewater is evenly distributed along the cross section perpendicular to the water flow and passes through the granular sludge reaction zone C. The first limiting plate 12 is a porous plate, and the wastewater passes through the through holes on the first limiting plate 12 from the granular sludge reaction zone C into the circulation return zone D and the pure membrane moving bed biofilm reaction zone A in sequence. The through hole size on the first limiting plate 12 is smaller than the size of the biological carrier.

[0081] Example 2

[0082] This embodiment provides a method for treating brewing wastewater based on the brewing wastewater treatment device of Embodiment 1 above, comprising the following steps:

[0083] S1: Pretreatment: The brewing wastewater passes through the screen tank 26 and sedimentation tank 27 to remove impurities, and then enters the equalization tank 28 for water quality and quantity balancing. The average water quality of the brewing wastewater treated in this embodiment is: COD 13500mg / L, BOD 6200mg / L, TN 215mg / L, TP 68mg / L, SS 750mg / L.

[0084] S2: Coagulation and sedimentation treatment: When the pretreated wastewater passes through the first pipeline mixer 301, a coagulant is added. In this embodiment, 750 mg / L polyaluminum chloride (PAC) is preferred. When it passes through the second pipeline mixer 302, a flocculant is added. In this embodiment, 8 mg / L cationic polyacrylamide (CPAM) is preferred. Then it enters the coagulation and sedimentation tank 31 for coagulation reaction. After the coagulation reaction, the wastewater undergoes mud-water separation in the coagulation and sedimentation tank. The supernatant is extracted and enters the first intermediate water tank 32.

[0085] S3: Biological Treatment: Nutrients are added to the first intermediate tank 32, and the pH value is adjusted with alkaline and acidic solutions. The wastewater enters the anaerobic reactor 34 through the second inlet pump 33 for anaerobic treatment. The treated wastewater then enters the second intermediate tank 35. Nutrients are added to the second intermediate tank 35, and the pH value is adjusted with alkaline and acidic solutions. The wastewater then enters the pure membrane aerobic biofilm coupled granular sludge reactor through the third inlet pump 21 for anaerobic coupled aerobic biochemical oxidation treatment.

[0086] S31: Wastewater from the first intermediate water tank 32 enters the anaerobic reactor 34 for anaerobic treatment, then enters the second intermediate water tank 35, and is then transported by the third inlet pump 21 into the pure membrane aerobic biofilm coupled granular sludge reactor for treatment.

[0087] S32: Wastewater first enters the pure membrane moving bed biofilm reaction zone A of the pure membrane aerobic biofilm coupled granular sludge reactor. At the same time, the circulating water pump 2 is started. The wastewater in the pure membrane moving bed biofilm reaction zone A is transported to the water distribution system 6 through the circulating water pump 2. Then it enters the granular sludge reaction zone C. When the granular sludge reaction zone C is full of wastewater and the wastewater in the pure membrane moving bed biofilm reaction zone A reaches the set water level, the water intake is stopped.

[0088] S33: After the water intake is completed, the second blower 14 is started, and the wastewater in the pure membrane moving bed biofilm reaction zone A is aerated through the aeration system 13. The biofilm on the medium material of the pure membrane moving bed biofilm reaction zone A performs biochemical treatment on the wastewater. The wastewater after aeration is transported to the water distribution system 6 in the water distribution and aeration zone B by the circulating water pump 2. The water distribution system 6 evenly distributes the wastewater entering the water distribution and aeration zone B.

[0089] S34: Next, the wastewater enters the biological carrier bed in the granular sludge reaction zone C, and passes through the aerobic granular sludge reaction zone C1 and the anaerobic granular sludge reaction zone C2 in sequence. The flow rate of the wastewater in the biological carrier bed is maintained. The wastewater undergoes biochemical oxidation treatment in the biological carrier bed, and then enters the circulation return zone D through the limiting plate.

[0090] S35: Wastewater in the recirculation zone D is sequentially passed through the pure membrane moving bed biofilm reaction zone A, water and air distribution zone B, aerobic granular sludge reaction zone C1, anaerobic granular sludge reaction zone C2 and recirculation zone D by the circulating water pump 2 for wastewater recycling treatment.

[0091] S36: After the circulation treatment is completed, stop the circulating water pump 2 and the second blower 14, and discharge a certain proportion of wastewater from the pure membrane aerobic biofilm coupled granular sludge reactor through the drain outlet 10.

[0092] In this embodiment, the volume of the expansion space 11 is 1 / 50 of the volume of the biological carrier bed 9, the flow rate of wastewater in the biological carrier bed 9 is 15 mm / s, the dissolved oxygen concentration in the pure membrane moving bed biofilm reaction zone A is 4-5 mg / L, the dissolved oxygen concentration in the aerobic granular sludge reaction zone C1 is 1-3 mg / L, and the dissolved oxygen concentration in the anaerobic granular sludge reaction zone C2 is <0.5 mg / L.

[0093] S37: The biogas produced by anaerobic reactor 34 enters the biogas collection and utilization system. The biogas produced by anaerobic granular sludge reaction zone C2 enters the biogas collection zone E and then enters the biogas collection and utilization system. The biogas is utilized after being purified by decarbonization, desulfurization and other treatments.

[0094] S38: The biological carrier in the granular sludge reaction zone C is backwashed by the first blower 4 and the air distribution system 5. The backwashed wastewater is discharged from the reactor through the backwash drain outlet 3 and transported to the equalization tank 28, where it is coagulated and settled together with the pretreated wastewater.

[0095] S4: Ozone Oxidation: After biological treatment, the wastewater enters the third intermediate tank 36. Ozone catalyst hydrogen peroxide is added to the third intermediate tank 36. Then, the wastewater is pumped to the ozone oxidation tank 38 via the fourth inlet pump 37. Simultaneously, ozone from the ozone generation system is supplied to the ozone oxidation tank 38 via the ozone diffuser 39 for catalytic ozone oxidation treatment of the wastewater. The treated wastewater is discharged from the reactor, and the tail gas is treated by the ozone quencher 40 before being discharged, completing the treatment process for the brewing wastewater. In this embodiment, the ozone dosage is 150 mg / L, and the hydrogen peroxide dosage is 0.25 mmol / L.

[0096] In this embodiment, a set proportion of the ozone-oxidized wastewater is recycled to the second intermediate water tank, and then enters a pure membrane aerobic biofilm coupled granular sludge reactor for deep biological treatment of the wastewater.

[0097] The average water quality of the treated wastewater is as follows: COD<100mg / L, BOD<20mg / L, TN<20mg / L, TP<8mg / L, SS<35mg / L.

[0098] In this embodiment, during the process of the wastewater passing through the biological carrier bed 9 of the pure membrane aerobic biofilm coupled granular sludge reactor, the suspended solids in the wastewater are adsorbed and intercepted by microorganisms, and then decomposed and degraded. Therefore, the concentration of suspended solids in the wastewater is very low after treatment, the effluent quality is stable, and a secondary sedimentation tank is not required.

[0099] Example 3:

[0100] Except for the following technical features, the technical solution of this embodiment is the same as that of Embodiment 2:

[0101] This embodiment provides a method for treating brewing wastewater based on the brewing wastewater treatment device of Embodiment 1 above. The volume of the expansion space 11 is set to 1 / 40 of the volume of the biological carrier bed 9. The flow velocity of the wastewater in the biological carrier bed 9 is 1.5 mm / s. The dissolved oxygen concentration in the pure membrane moving bed biofilm reaction zone A is 5-6 mg / L, the dissolved oxygen concentration in the aerobic granular sludge reaction zone C1 is 1-3 mg / L, the dissolved oxygen concentration in the anaerobic granular sludge reaction zone C2 is <0.5 mg / L, the ozone dosage is 100 mg / L, and the hydrogen peroxide dosage is 0.20 mmol / L.

[0102] In this embodiment, 30% of the ozone-oxidized wastewater is recycled to the second intermediate water tank 35, and then enters the pure membrane aerobic biofilm coupled granular sludge reactor for deep biological treatment of the wastewater, so as to further improve the wastewater treatment effect.

[0103] The average water quality of the brewing wastewater treated in this embodiment is as follows: COD 13500 mg / L, BOD 6200 mg / L, TN 215 mg / L, TP 68 mg / L, and SS 750 mg / L. The average water quality of the treated wastewater is as follows: COD < 70 mg / L, BOD < 15 mg / L, TN < 15 mg / L, TP < 6 mg / L, and SS < 10 mg / L.

[0104] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A device for treating brewer's wastewater, characterized in that, The application relates to a wastewater treatment system, which comprises a grid pool, a sedimentation pool, a regulating pool, a coagulation sedimentation pool, a first intermediate water pool, an anaerobic reactor, a second intermediate water pool, a pure membrane aerobic biofilm coupled granular sludge reactor, a third intermediate water pool and an ozone oxidation pool. The grid pool outlet is connected with the sedimentation pool inlet, the sedimentation pool outlet is connected with the regulating pool inlet, the regulating pool outlet is connected with the first pipeline mixer through a first water inlet pump, the first pipeline mixer is mixed with a coagulant, and is connected with a second pipeline mixer, the second pipeline mixer is mixed with a flocculant, and is connected with the coagulation sedimentation pool inlet, the coagulation sedimentation pool outlet is connected with the first intermediate water pool inlet, the first intermediate water pool outlet is connected with the anaerobic reactor through a second water inlet pump, the anaerobic reactor outlet is connected with the second intermediate water pool inlet, the second intermediate water pool outlet is connected with the pure membrane aerobic biofilm coupled granular sludge reactor through a third water inlet pump, the pure membrane aerobic biofilm coupled granular sludge reactor outlet is connected with the third intermediate water pool inlet, and the third intermediate water pool outlet is connected with the ozone oxidation pool through a fourth water inlet pump. The pure membrane aerobic biofilm coupled granular sludge reactor is provided with a pure membrane moving bed biofilm reaction zone, a water and gas distribution zone and a granular sludge reaction zone, the pure membrane moving bed biofilm reaction zone is communicated with the water and gas distribution zone, the water and gas distribution zone is communicated with the granular sludge reaction zone, the pure membrane moving bed biofilm reaction zone is provided with a medium material and an aeration system, the medium material is cultured to form a pure membrane aerobic biofilm, and the granular sludge reaction zone is provided with an aerobic granular sludge reaction zone and an anaerobic granular sludge reaction zone. The reaction zone space regulation unit is used for regulating the physical space of the aerobic granular sludge reaction zone and the anaerobic granular sludge reaction zone, and specifically comprises the following: The reaction zone space regulation unit regulates the filling rate of the medium material in the pure membrane moving bed biofilm reaction zone by changing the quantity of the medium material, regulates the sludge concentration in the pure membrane moving bed biofilm reaction zone, and regulates the dissolved oxygen concentration in the granular sludge reaction zone. And / or, the reaction zone space regulation unit regulates the dissolved oxygen concentration in the pure membrane moving bed biofilm reaction zone and the aerobic granular sludge reaction zone by regulating the aeration amount of the aeration system, so as to realize the physical space regulation of the aerobic granular sludge reaction zone and the anaerobic granular sludge reaction zone. The granular sludge reaction zone is provided with a support plate.

2. The apparatus for treating brewery wastewater according to claim 1, wherein The water and gas distribution zone is provided with a water distribution system, a gas distribution system and a water distributor, the gas distribution system is connected with a first air blower, the gas distribution system is arranged on one side of the water distribution system, and the water distributor is arranged on the support plate. The pure membrane moving bed biofilm reaction zone is further provided with a water inlet, a circulating water outlet and a drainage port.

3. The apparatus for treating brewery wastewater according to claim 2, wherein The water inlet is connected with a water inlet pump, wastewater enters the pure membrane moving bed biofilm reaction zone through the water inlet, the circulating water outlet is connected with a circulating water inlet pump, the circulating water outlet is connected with the water inlet of the circulating water inlet pump, the water outlet of the circulating water inlet pump is connected with the water distribution system, and the drainage port is used for draining wastewater in a set proportion. The granular sludge reaction zone is further provided with a biological carrier bed and a first limiting plate, the biological carrier bed is arranged on the support plate, and the interval between the biological carrier bed and the first limiting plate forms an expansion space.

4. The apparatus for treating brewery wastewater according to claim 2, wherein ​ 5. The apparatus for treating brewery wastewater according to claim 4, wherein The volume of the expansion space is 1 / 50-1 / 20 of the volume of the biological carrier bed.

6. The apparatus for treating brewery wastewater according to claim 4, wherein The biological carrier bed is dispersedly arranged with biological carriers, and the outer circle of the biological carriers is provided with a biological membrane, and the inner circle of the biological carriers is provided with a partition strip; The inner circle of the biological carriers in the aerobic granular sludge reaction zone is provided with aerobic granular sludge, and the inner circle of the biological carriers in the anaerobic granular sludge reaction zone is provided with anaerobic granular sludge.

7. The device for treating brewery wastewater according to claim 1, characterized in that, The pure membrane moving bed biological membrane reaction zone is further provided with a second limiting plate; The second limiting plate is a perforated plate, and the size of the through holes on the second limiting plate is smaller than the size of the medium material.

8. The apparatus for treating brewery wastewater according to claim 1, wherein A circulating backflow zone is further provided, the circulating backflow zone is provided with a water outlet tank, the water outlet tank is provided with a circulating backflow port, and the circulating backflow port is connected with the pure membrane moving bed biological membrane reaction zone.

9. A treatment method of the treatment apparatus for brewery wastewater according to any one of claims 1 to 8, characterized by, The method comprises the following steps: Pretreatment: the brewing wastewater is treated by a grid pool and a sedimentation pool to remove impurities, and then is balanced and adjusted in quality and quantity in a regulating pool; Coagulation and sedimentation treatment: after the pretreated wastewater passes through a first pipeline mixer, a coagulant is added, passes through a second pipeline mixer, a flocculant is added, and is mixed, and then enters a coagulation and sedimentation pool to perform a coagulation reaction, after the coagulation reaction, the wastewater is separated into sludge and water in the coagulation and sedimentation pool, and the supernatant is extracted into a first intermediate pool; Biological treatment: nutrient salts are added into the first intermediate pool, and the pH value is adjusted by using alkali and acid solutions, the wastewater enters an anaerobic reactor for anaerobic treatment, and then enters a pure membrane aerobic biological membrane coupled granular sludge reactor for anaerobic and aerobic biochemical oxidation treatment, which specifically comprises: After the wastewater in the first intermediate pool is treated in the anaerobic reactor, the wastewater enters a second intermediate pool, nutrient salts are added into the second intermediate pool, and the pH value is adjusted by using alkali and acid solutions, and then the wastewater enters the pure membrane aerobic biological membrane coupled granular sludge reactor for treatment; The wastewater enters a pure membrane moving bed biological membrane reaction zone of the pure membrane aerobic biological membrane coupled granular sludge reactor, the wastewater in the pure membrane moving bed biological membrane reaction zone is transported to a water and air distribution zone, and then enters a granular sludge reaction zone, and when the granular sludge reaction zone is filled with wastewater and the wastewater in the pure membrane moving bed biological membrane reaction zone reaches a set water level, the water inlet is stopped; After the water inlet is completed, the wastewater in the pure membrane moving bed biological membrane reaction zone is aerated by using an aeration system, the biological membrane on the medium material in the pure membrane moving bed biological membrane reaction zone performs biochemical treatment on the wastewater, and the wastewater after aeration is transported to the water and air distribution zone; The wastewater sequentially passes through the aerobic granular sludge reaction zone and the anaerobic granular sludge reaction zone, the flow rate of the wastewater is maintained, and after the wastewater is subjected to biochemical oxidation treatment, the wastewater is subjected to circulation treatment, sequentially passes through the pure membrane moving bed biological membrane reaction zone, the water and air distribution zone, the aerobic granular sludge reaction zone, and the anaerobic granular sludge reaction zone; After the circulation treatment is completed, a set proportion of the wastewater is discharged; Biogas produced by the anaerobic reactor and biogas produced by the anaerobic granular sludge reaction zone are purified and then utilized; The granular sludge reaction zone is backwashed, and the wastewater after backwashing is transported to the regulating pool and subjected to coagulation and sedimentation treatment together with the pretreated wastewater; Ozone oxidation: the wastewater is treated by biological treatment and then enters the third intermediate water pool, ozone catalyst is added in the third intermediate water pool, then the wastewater is transported to the ozone oxidation pool, the catalytic ozone oxidation treatment of the wastewater is carried out, the treated wastewater is discharged from the reactor, and the treatment process of the brewing wastewater is completed.

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