A lateral flow circulating anaerobic reactor and wastewater treatment method

Abstract

The application discloses a side-flow circulating anaerobic reactor and a wastewater treatment method, and belongs to the technical field of sewage treatment. The side-flow circulating anaerobic reactor comprises a full reaction chamber, a reaction and separation chamber with an upper opening, a circulating water inlet and outlet and a water inlet pipe. The lower part of the reaction and separation chamber is a reaction zone, and the upper part is a separation zone. The reaction zone is provided with a water inlet culvert and a water outlet culvert. The water inlet culvert is connected with the circulating water outlet, the water outlet culvert is connected with the circulating water inlet, and the bottom of the culvert is provided with a water distribution hole. The separation zone comprises a three-phase separator and a water outlet water collecting tank, and the water outlet water collecting tank is arranged at the top of the three-phase separator. A wall-penetrating biogas pipe is arranged in the partition wall between the full reaction chamber and the reaction and separation chamber. The reaction space is improved by optimizing the partition, the water inlet distribution system is replaced by a wall-penetrating pump, the circulating amount and the mixing and contacting effect are improved, the energy consumption is reduced, the three-phase separator is arranged only in the separation zone, the separation effect is improved by improving the structure, and the treated wastewater does not need to enter an anaerobic sedimentation tank.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, specifically relating to a side-flow circulating anaerobic reactor and a wastewater treatment method. Background Technology

[0002] The information disclosed in this background section is intended only to enhance understanding of the overall background of the invention and is not necessarily to be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.

[0003] Anaerobic biological treatment is suitable for treating high-concentration organic wastewater. It utilizes the metabolic characteristics of anaerobic microorganisms to generate methane gas with energy value by using the reduced organic matter as a hydrogen acceptor without the need for external energy.

[0004] Anaerobic reactors are the core carriers for anaerobic biological treatment of wastewater. Microorganisms in anaerobic sludge come into contact with and adsorb organic matter in wastewater, decomposing the organic matter and thus purifying the wastewater and producing useful biogas.

[0005] An upflow anaerobic sludge bed reactor (UASB) consists of an influent distribution zone, a reaction zone, and a solid-liquid-gas three-phase separation zone. The reaction zone of the UASB includes a sludge bed and a suspended sludge zone. Wastewater enters from the bottom of the UASB, contacting the sludge bed and suspended sludge zone. Microorganisms adsorb and decompose the organic matter in the wastewater, simultaneously producing biogas. The sludge, water, and gas mixture rises to the solid-liquid-gas three-phase separator. When biogas bubbles encounter the reflector plate at the bottom of the three-phase separator, they are deflected towards the gas collection chamber and then separated and discharged. The sludge and water enter the sedimentation zone of the three-phase separator. Under gravity, the supernatant is discharged from the outlet, and the sludge returns to the reaction zone along the inclined wall.

[0006] An internal circulation anaerobic reactor (IC) is similar to two UASB reactors connected in series. It consists of two reaction chambers, one above the other. The IC reactor uses the biogas it produces as the power source to achieve internal circulation of the mixed liquor. It is the mainstream anaerobic reactor.

[0007] Compared to UASB, IC has the advantages of internal circulation diluting the influent, better shock resistance, high volumetric loading, short retention time, stable operation, lower investment, and smaller footprint. Its disadvantages include: the need for a complex influent distribution system; the large height-to-diameter ratio of IC, typically 4-8, requiring additional circulation pumps to maintain the upward flow velocity within the anaerobic reactor, resulting in high power consumption and operating costs; the need for a complex three-phase separator across the entire cross-section of the reactor; lower removal rates than UASB when wastewater biodegradability is poor due to the shorter hydraulic retention time; and a faster upward flow velocity leading to higher levels of fine particulate matter in the effluent, necessitating the addition of an anaerobic sedimentation tank and increasing the overall construction cost of the treatment system. Summary of the Invention

[0008] To address the shortcomings of existing technologies, the present invention aims to provide a side-flow circulating anaerobic reactor and a wastewater treatment method. The side-flow circulating anaerobic reactor provided by the present invention is a rectangular anaerobic reactor with a reinforced concrete structure. By optimizing the functional planar partitioning of the reactor, the reaction zone space is increased, the complex influent and makeup water system is eliminated, energy consumption is reduced, and a three-phase separator is only set in some areas. Furthermore, the structure of the three-phase separator is improved to enhance its effectiveness, eliminating the need for an anaerobic sedimentation tank after the reactor.

[0009] To achieve the above objectives, the technical solution of the present invention is as follows:

[0010] A first aspect of the present invention provides a side-flow circulating anaerobic reactor, comprising:

[0011] The full reaction chamber includes a full reaction chamber body, a circulating water inlet and a circulating water outlet located at the lower part of the full reaction chamber body, and a water inlet pipe connected to the full reaction chamber body;

[0012] The reaction separation chamber has an upper opening, and a partition wall is provided between the reaction separation chamber and the full reaction chamber. The lower part of the reaction separation chamber is the reaction zone, and the upper part is the separation zone. At the bottom ends of the reaction zone, an inlet culvert and an outlet culvert are provided opposite to each other. The inlet culvert is connected to the circulating water outlet, and the outlet culvert is connected to the circulating water inlet. Water distribution holes are provided at the bottom of the side walls of both the inlet culvert and the outlet culvert. The separation zone includes a three-phase separator and an outlet water collection tank, and the outlet water collection tank is located on top of the three-phase separator.

[0013] It also includes a through-wall biogas pipe, which is installed in the partition wall between the full reaction chamber and the reaction separation chamber, connecting the biogas collected by the three-phase separator in the separation zone with the full reaction chamber, so that the biogas can be discharged to the full reaction chamber through the through-wall biogas pipe.

[0014] In some embodiments of the present invention, the full reaction chamber is provided with a partition wall to divide the full reaction chamber into an even number of independent reaction zones. The bottom of the partition wall between the first independent reaction zone and the reaction separation chamber is provided with a circulating water inlet, and the bottom of the partition wall between the last independent reaction zone and the reaction separation chamber is provided with a circulating water outlet.

[0015] The upper or lower part of the partition wall between two adjacent independent reaction zones is provided with flow holes, which are alternately arranged on the adjacent partition walls, and the water flow direction of the circulating water inlet and the circulating water outlet is either clockwise or counterclockwise.

[0016] The outlet of the inlet pipe is located at the circulating water inlet that connects the outlet culvert to the first independent reaction zone.

[0017] In some embodiments of the present invention, a through-wall pump is provided below the liquid level at the top of the partition wall between the first independent reaction zone and the second independent reaction zone, for the purpose of directionally discharging the sewage in the first independent reaction zone into the second independent reaction zone;

[0018] The rated flow rate of the through-wall pump is ≥ 20 times the inlet flow rate;

[0019] A return well is provided at the installation location of the through-wall pump. The return well is open at the top and closed at the bottom. A flow passage is provided on the well wall in the flow direction, and an equipment installation hole is provided on the partition wall in the flow direction.

[0020] In some embodiments of the present invention, an air passage is provided at the top of the partition wall between two adjacent independent reaction zones, above the liquid surface.

[0021] In some embodiments of the present invention, the top walls of the inlet culvert and the outlet culvert are inclined inward at an angle of 45° to 60° to the horizontal plane.

[0022] In some embodiments of the present invention, the three-phase separator includes a gas collecting hood, a guide plate, and a guide beam; the guide beam is horizontally arranged and parallel to the water inlet culvert, one end of the guide beam is set on the partition wall between the reaction separation chamber and the full reaction chamber, and the other end is set on the body of the full reaction chamber; the gas collecting hood is set on the top of the full reaction chamber, and a guide plate is connected to the left and right sides below each gas collecting hood, the two guide plates on the left and right sides form a group, each group of guide plates is arranged in a figure-eight shape, the lower end of each guide plate is connected to the guide beam, and gaps are provided between the guide plate and the gas collecting hood, and between the guide plate and the guide beam.

[0023] In some embodiments of the present invention, the side-flow circulating anaerobic reactor further includes a 90° elbow and a biogas main; the 90° elbow is located in the full reaction chamber and connected to the biogas pipe that passes through the wall, with the outlet of the 90° elbow facing downwards;

[0024] The biogas main pipe passes through the top of the full reaction chamber and is connected to the full reaction chamber to output biogas from the full reaction chamber.

[0025] In some embodiments of the present invention, the side-stream circulating anaerobic reactor further includes a total collection tank for collecting and flowing out the sewage collected by the effluent collection tank, and the total collection tank is arranged at the outer top of the reaction separation chamber body;

[0026] The effluent collection tank is arranged at the upper part of the gas collection hood, outside the reaction separation chamber body. The effluent collection tank and the gas collection hood are of an integrated structure, and the cross-section is in an "H" shape.

[0027] The second aspect of the present invention provides a wastewater treatment method, which uses the above-mentioned side-stream circulating anaerobic reactor and includes the following steps:

[0028] Inject the wastewater to be treated into the entire reaction chamber through the influent pipe. After reacting in the entire reaction chamber, it enters the influent culvert from the self-circulating water outlet, enters the reaction zone through the water distribution holes. Under the lifting force of the biogas, part of the mud-water mixture rises from the reaction zone into the separation zone, is separated by the three-phase separator, the biogas enters the entire reaction chamber, the sludge sinks, and the treated wastewater rises into the effluent collection tank; part of the mud-water mixture enters the effluent culvert and enters the entire reaction chamber through the circulating water inlet, thereby forming a circulating flow of the mud-water mixture between the entire reaction chamber and the reaction zone.

[0029] In some embodiments of the present invention, the lateral flow velocity of the mud-water mixture at the bottom of the reaction zone is ≥ 0.3 m / s.

[0030] The beneficial effects of the present invention are as follows:

[0031] The present invention provides a side-stream circulating anaerobic reactor, which has the following beneficial effects compared with the traditional anaerobic reactors UASB and IC: By optimizing the functional plane partition of the reactor, the total space of the reaction zone is increased. The side-stream circulating anaerobic reactor is a rectangular pool body with a compact layout. Especially for large-scale sewage treatment projects, multiple anaerobic reactors can be built with a common wall to save land and construction costs. By optimizing the functional plane partition of the reactor, only a three-phase separator is arranged in the separation zone, and the structure of the gas collection hood ("冂"-shaped structure) in the three-phase separator is improved to avoid biogas leakage, so that a microcirculation is formed in the separation zone for the mud-water mixture, and there is no need to export the sludge. The mud-water mixture rises and the precipitated sludge descends. Since the sludge return channel does not conflict with the upflow channel of the mud-water mixture, the precipitation separation effect is good, and there is no need to set an anaerobic sedimentation tank after the anaerobic reactor. The circulating flow direction of the mud-water mixture is in the horizontal direction at the bottom and the lateral direction beside the three-phase separator, which does not affect the longitudinal three-phase separation effect of the three-phase separator.

[0032] This side-flow circulating anaerobic reactor features a rectangular tank structure that can be constructed with reinforced concrete, offering superior corrosion resistance and insulation compared to steel structures. Furthermore, it utilizes a low-lift, high-flow-rate through-wall pump to control the flow direction and velocity of the slurry mixture, improving circulation volume and mixing contact. This eliminates the need for a complex inlet water distribution system, eliminates the need for circulation pipelines, and results in low energy consumption.

[0033] This side-flow circulating anaerobic reactor uses a through-wall biogas pipe and a 90° bend. The through-wall biogas pipe is connected to the downward-facing 90° bend to form a water seal, allowing biogas to be discharged from the gas collection hood to the independent reaction zone. However, the mud-water mixture in the gas collection hood cannot be discharged to the independent reaction zone with the biogas flow. Therefore, it is not necessary to install a biogas collection pipe, a dedicated biogas gas-water separator, or a water seal tank to form the gas chamber of the three-phase separator. Attached Figure Description

[0034] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0035] Figure 1 A schematic plan view of a side-flow circulating anaerobic reactor provided in an embodiment of the present invention;

[0036] Figure 2 A schematic longitudinal section of the entire reaction chamber of the side-flow circulating anaerobic reactor provided in an embodiment of the present invention;

[0037] Figure 3 A longitudinal cross-sectional schematic diagram of the reaction separation zone of the side-flow circulating anaerobic reactor provided in an embodiment of the present invention;

[0038] Figure 4 This is a schematic longitudinal section of the side-flow circulating anaerobic reactor provided in an embodiment of the present invention;

[0039] Figure 5 This is a diagram of a semi-enclosed structure formed by guide plates in a side-flow circulating anaerobic reactor provided in an embodiment of the present invention.

[0040] The meanings of the symbols in the diagram are as follows:

[0041] 1-Full reaction chamber, 11-Full reaction chamber body, 12-Circulating water inlet, 13-Circulating water outlet, 14-Flow hole, 15-Through-wall pump, 16-Recirculation well, 17-Equipment mounting hole, 18-Air vent, 19-90° elbow, 110-Independent reaction zone, 1101-First independent reaction zone, 1102-Second independent reaction zone, 1103-Third independent reaction zone, 1104-Fourth independent reaction zone;

[0042] 2-Reaction separation chamber, 21-Reaction zone, 211-Inlet culvert, 212-Outlet culvert, 213-Water distribution hole; 22-Separation zone, 221-Three-phase separator, 2211-Guide beam, 2212-Guide plate, 2213-Gas collection trough, 2214-Guide bracket, 2215-Trapezoidal plate, 222-Outlet water collection trough, 223-Main water collection trough;

[0043] 3-Partition walls;

[0044] 4-Inlet pipe;

[0045] 5- Biogas pipe penetrating the wall;

[0046] 6- Biogas main pipe;

[0047] 7-Construction manhole;

[0048] 8-Sealed top cover

[0049] 9-Water outlet pipe. Detailed Implementation

[0050] One of the core aspects of this invention is to provide a side-flow circulating anaerobic reactor. The structural design of this device enables it to save space and construction costs, eliminates the complex inlet water distribution system, eliminates the need for circulation pipelines, has low energy consumption, and achieves high three-phase separation efficiency.

[0051] Another core aspect of this invention is to provide a wastewater treatment method based on the aforementioned side-flow circulating anaerobic reactor.

[0052] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0053] Please see Figures 1-4 , Figure 1 This is a plan view of a side-flow circulating anaerobic reactor provided in an embodiment of the present invention. Figure 2 This is a schematic longitudinal section of the entire reaction chamber of the side-flow circulating anaerobic reactor provided in an embodiment of the present invention. Figure 3 This is a longitudinal cross-sectional schematic diagram of the reaction separation zone of the side-flow circulating anaerobic reactor provided in an embodiment of the present invention. Figure 4 This is a schematic longitudinal section of the side-flow circulating anaerobic reactor provided in an embodiment of the present invention.

[0054] This invention discloses a side-flow circulating anaerobic reactor, which includes a full reaction chamber 1 and a top-opening reaction separation chamber 2.

[0055] The full reaction chamber 1 includes a full reaction chamber body 11, a circulating water inlet 12 and a circulating water outlet 13 located at the lower part of the full reaction chamber body 11, and a water inlet pipe 4 connected to the full reaction chamber body 11. The full reaction chamber 1 is used to introduce wastewater to be treated and to provide a place for the reaction between sludge and wastewater to be treated.

[0056] The reaction separation chamber 2 is separated from the full reaction chamber 1 by a partition wall 3. The lower part of the reaction separation chamber 2 is the reaction zone 21, and the upper part is the separation zone 22. At the bottom ends of the reaction zone 21, an inlet culvert 211 and an outlet culvert 212 are respectively arranged. The inlet culvert 211 is connected to the circulating water outlet 13, and the outlet culvert 212 is connected to the circulating water inlet 12. Water distribution holes 213 are provided at the bottom of the side walls of both the inlet culvert 211 and the outlet culvert 212. The separation zone 22 includes a three-phase separator 221 and an outlet water collection tank 222, with the outlet water collection tank 222 located on top of the three-phase separator 221. The reaction zone 21 of the reaction separation chamber 2 provides a reaction site for the sludge-water mixture in the full reaction chamber 1, and the separation zone 22 separates the sludge, wastewater, and biogas to obtain treated wastewater.

[0057] The side-flow circulating anaerobic reactor also includes a through-wall biogas pipe 5, which is installed in the partition wall 3 between the full reaction chamber 1 and the reaction separation chamber 2. The biogas collected by the three-phase separator 221 in the separation zone 22 is connected to the full reaction chamber 1, so that the biogas is discharged to the full reaction chamber 1 through the through-wall biogas pipe 5.

[0058] It should be noted that the inlet culvert 211 and outlet culvert 212 have the same structure, one for inlet and one for outlet in the side-flow circulating anaerobic reactor, and are named according to the flow direction of the mud-water mixture in the side-flow circulating anaerobic reactor. If the outlet direction in the whole reaction chamber 1 is changed (i.e., the circulating water inlet 12 and the circulating water outlet 13 are swapped), the positions of the inlet culvert 211 and the outlet culvert 212 remain unchanged, but their functions are reversed, and correspondingly, their names are also reversed.

[0059] Specifically, such as Figure 1-4 As shown in this embodiment of the invention, the side-flow circulating anaerobic reactor is a rectangular tank, with the reaction separation chamber 2 located on one side of the full reaction chamber 1, and both having roughly the same height. A reinforced concrete structure can be used, offering better corrosion resistance and insulation than a steel structure.

[0060] As can be seen, compared with the prior art, the side-flow circulating anaerobic reactor provided in this embodiment of the invention has a reasonable layout and compact structure. Especially for large-scale wastewater treatment projects, multiple anaerobic reactors can be built together with a shared wall, saving land area and construction costs. The side-flow circulating anaerobic reactor provided in this embodiment of the invention improves the space of the reaction zone 22 by optimizing the functional planar zoning of the reactor, thereby improving the wastewater treatment effect.

[0061] Specifically, in the embodiments of the present invention, such as Figure 1 and Figure 2 As shown, the full reaction chamber 1 is provided with a partition wall 3, which divides the full reaction chamber 1 into an even number of independent reaction zones 110. The bottom of the partition wall 3 between the first independent reaction zone 110 and the reaction separation chamber 2 is provided with a circulating water inlet 12, and the bottom of the partition wall between the last independent reaction zone 110 and the reaction separation chamber 2 is provided with a circulating water outlet 103.

[0062] The top or bottom of the partition wall 3 between two adjacent independent reaction zones 110 is provided with a flow hole 14.

[0063] To avoid flow interruption, the flow holes 14 are alternately arranged on the adjacent partition walls 3, and the water flow direction of the circulating water inlet and the circulating water outlet is clockwise or counterclockwise, so that the flow state in the independent reaction zone 110 is upward (or downward) clockwise (or counterclockwise) swirling.

[0064] It should be noted that the flow holes 14 provided on the upper part of the partition wall 3 between two adjacent independent reaction zones 110 should not be too high. Avoid setting them on the top of the partition wall 3. They should be set at or below the liquid level to prevent the liquid level in the entire reaction chamber 1 from being too high and wastewater from flowing back into the reaction separation chamber 2 through the biogas pipe 5.

[0065] It should be noted that the flow holes between the partition walls are collectively referred to as flow holes 14. There are many flow holes 14, and they are not distinguished.

[0066] like Figure 2 As shown, the full reaction chamber 1 is equipped with three partition walls 3, dividing the full reaction chamber 1 into four independent reaction zones 110. If the sewage flows clockwise between the full reaction chamber 1 and the reaction zone 21, according to the sewage flow direction, the four independent reaction zones 110 are, from left to right, the first independent reaction zone 1101, the second independent reaction zone 1102, the third independent reaction zone 1103, and the fourth independent reaction zone 1104. The circulating water inlet 12 is located at the bottom of the first independent reaction zone 1101, so the first independent reaction zone 1101 can be a bottom-inlet and top-outlet system, that is, the flow holes on the partition wall 3 between the first independent reaction zone 1101 and the second independent reaction zone 1102 are located at the top. Similarly, if the second independent reaction zone 1102 has an upper inlet and a lower outlet, then the flow passage on the partition wall 3 between the second independent reaction zone 1102 and the third independent reaction zone 1103 is located at the lower part; if the third independent reaction zone 1102 has a lower inlet and an upper outlet, then the flow passage on the partition wall 3 between the third independent reaction zone 1103 and the fourth independent reaction zone 1104 is located at the upper part.

[0067] It should be noted that the number of independent reaction zones 110 within the total reaction chamber 1 can be an even number, such as 2, 4, 6, 8, etc., depending on actual needs.

[0068] Specifically, in the embodiments of the present invention, such as Figure 2 As shown, the outlet of the inlet pipe 4 is located at the circulating water inlet 12, which connects the outlet culvert 212 to the first independent reaction zone 110. Water entering at this location ensures that the newly added wastewater does not affect the flow direction of the mud-water mixture within the entire reaction chamber 1, thus improving the wastewater treatment effect.

[0069] Furthermore, such as Figure 2 As shown, in order to ensure the circulation flow direction of the mud-water mixture in the full reaction chamber 1 and the reaction zone 21, a through-wall pump 15 is provided below the top liquid level of the partition wall 3 between the first independent reaction zone 110 and the second independent reaction zone 110, which is used to directionally discharge the sewage in the first independent reaction zone 110 to the second independent reaction zone 110.

[0070] The rated flow rate of the through-wall pump 15 is ≥ 20 times the inlet flow rate;

[0071] A return well 16 is provided at the installation position of the through-wall pump 15. The return well 16 is open at the top and closed at the bottom. A flow hole 14 is provided on the well wall in the inflow direction, and an equipment installation hole 17 is provided on the partition wall 3 in the outflow direction.

[0072] It should be noted that the wall-penetrating pump 15 can be a low-lift, high-flow wall-penetrating pump. Under the action of the wall-penetrating pump 15, the mud-water mixture flows through the first and last independent reaction zones 110 in sequence, enters the inlet culvert 211 from the circulating water outlet 12, flows into the reaction zone 21 through the water distribution hole 213, and flows out of the reaction zone 21 through the water distribution hole 213 of the outlet culvert 212 and the circulating water inlet 11, and enters the first independent reaction zone 110, thereby forming a circulation flow of the mud-water mixture between the independent reaction zone 110 and the reaction zone 21.

[0073] In one embodiment of the present invention, an air passage 18 is provided at the top of the partition wall 3 between two adjacent independent reaction zones 110, above the liquid surface. The air passage 18 connects the top of the independent reaction zones 110 above the liquid surface into a whole, which is beneficial for collecting and outputting the biogas generated during the wastewater treatment process.

[0074] In one embodiment of the present invention, the top walls of the inlet culvert 211 and the outlet culvert 212 form an angle of 45° to 60° with the horizontal plane and slope inward. The structures of the inlet culvert 211 and the outlet culvert 212 are symmetrical, and multiple water distribution holes 213 are provided at the bottom of the side walls of both the inlet culvert 211 and the outlet culvert 212. The number of water distribution holes 213 can be determined according to the length of the inlet culvert 211 and the outlet culvert 212.

[0075] In one embodiment of the present invention, such as Figure 3 , Figure 4As shown, the three-phase separator 221 includes a gas collection hood 2213, a guide plate 2212, and a guide beam 2211. The guide beam 2211 is horizontally arranged and parallel to the water inlet culvert 211. One end of the guide beam 2211 is set on the partition wall 3 between the reaction separation chamber 2 and the full reaction chamber 1, and the other end is set on the body of the full reaction chamber 2. The gas collection hood 2213 is set on the top of the full reaction chamber 2. Each gas collection hood 2213 is connected to a guide plate 2212 on the left and right sides below it. The two guide plates 2212 on the left and right sides form a group. Each group of guide plates 2212 is arranged in a figure-eight shape. The lower end of each guide plate 2212 is connected to the guide beam 2211. There are gaps between the guide plate 2212 and the gas collection hood 2213, and between the guide plate 2212 and the guide beam 2211.

[0076] It should be noted that the distance between the upper ends of each set of guide plates 2212 is less than the distance between the lower opening of the gas collection hood 2213, ensuring that biogas rises through each set of guide plates 2212 into the gas collection hood 2213, thus preventing biogas from escaping.

[0077] It should be noted that the cross-section of the guide beam 2211 can be rhomboid or triangular. The guide beam 2211 is used to fix the guide plate 2212 and provides support. The guide plate 2212 forms an angle of 45° to 60° with the horizontal plane. The ends of each set of guide plates 2212 are connected with the same material as the guide plate 2212 to form a semi-enclosed structure to prevent the collected biogas from leaking from both ends of the guide plate 2212. The semi-enclosed structure is a trapezoidal structure, with each end of the two guide plates 2212 enclosed by a trapezoidal plate 2215, forming a long trapezoidal structure with openings at the top and bottom and enclosed on all four sides, as shown below. Figure 5 As shown.

[0078] Gaps are provided between the guide plate 2212 and the gas collection hood 2213, and between the guide plate 2212 and the guide beam 2211. The gap between the guide plate 2212 and the gas collection hood 2213 allows the mud-water mixture to pass through. The three-phase separator 221 of this invention is used to separate biogas, sludge, and wastewater, and its separation principle is similar to that of an aerated sedimentation tank. Under the lifting force of biogas, the mud-water mixture mixed with biogas bubbles rises from below the guide plate 2212. Under the lifting effect, the mud-water mixture rises rapidly. Because the guide plate 2212 has a certain angle, the mud-water mixture continuously impacts the guide plate 2212 during its ascent to generate more biogas bubbles, thus fully realizing the separation of biogas. Since the distance between the upper ends of each set of guide plates 2212 is less than the distance between the lower openings of the gas collection hood 2213, the biogas bubbles directly enter the gas collection hood 2213 upwards, realizing the collection of biogas and preventing biogas escape. Understandably, the height of the guide plate 2212 in this invention is consistent with the height of a traditional three-phase separator, and the higher height allows for sufficient separation of biogas. The sludge-water mixture from which biogas has been separated enters the area above the guide plate 2212 through the gap between the guide plate 2212 and the gas collection hood 2213 and begins to settle and separate. Here, the sludge particles, due to their higher density, settle downwards, achieving effective separation of sludge and wastewater. Under the action of gravity, the settled sludge flows back to the area below the guide plate 2212 through the gap between the guide plate 2212 and the guide beam 2211, while the wastewater from which sludge has been separated rises to the effluent collection tank 222 for discharge. Since the sludge return channel and the sludge-water mixture rising channel do not conflict, the sludge sedimentation and separation effect is good, and there is no need to set up an anaerobic sedimentation tank after the side-flow circulation anaerobic reactor.

[0079] Preferably, the three-phase separator 221 further includes a flow guide bracket 2214.

[0080] It should be noted that the flow guide bracket 2214, also known as a bracket beam, is shaped as half (longitudinally cut) of the flow guide beam 2211, and its function is exactly the same as that of the flow guide beam 2211, also serving to guide and support the flow. However, the flow guide bracket 2214 is closely attached to the inner wall of the reaction separation chamber 2, therefore its structure is half of the flow guide beam 2211. The flow guide bracket is integrally constructed with the adjacent reaction separation chamber 2's pool wall, equivalent to a protrusion in the wall.

[0081] In one embodiment of the present invention, such as Figure 1 , Figure 2 and Figure 4 As shown, the side-flow circulating anaerobic reactor also includes a 90° elbow 19 and a biogas main 6; the 90° elbow 19 is located in the full reaction chamber 1 and is connected to the through-wall biogas pipe 5, with the outlet of the 90° elbow 19 facing downwards;

[0082] The main biogas pipe 6 passes through the top of the full reaction chamber 1 and is connected to the full reaction chamber 1 for outputting the biogas in the full reaction chamber 1.

[0083] It should be noted that the biogas pipe 5 passing through the wall is connected to the 90° elbow 19 with the mouth facing downwards to form a water seal, enabling the biogas to be discharged from the gas collection hood 2213 to the independent reaction zone 110, while the muddy water mixture in the gas collection hood 2213 cannot flow to the independent reaction zone 110 along with the biogas flow. A water seal tank for the gas chamber of the gas collection hood 2213 can be formed without setting a dedicated biogas gas-water separator.

[0084] In an embodiment of the present invention, as Figure 1 、 Figure 3 and Figure 4 shown, the side-stream circulating anaerobic reactor further includes a total water collection tank 223 for collecting the sewage collected by the effluent water collection tank 222 and flowing out. The total water collection tank 223 is arranged on the outer top of the main body of the reaction separation chamber 1;

[0085] The effluent water collection tank 222 is arranged at the upper part of the gas collection hood 2213, outside the main body of the reaction separation chamber 2. The effluent water collection tank 222 and the gas collection hood 2213 are of an integrated structure, and the cross-section is in an "H" shape.

[0086] It should be noted that the gas collection hood 2213 and the water collection tank 222 are of an integrated structure, and the cross-section is in an "H" shape. The upper half is the water collection tank 222, and the lower half is the gas collection hood 2213.

[0087] The gas collection hood 2213 is in a "冂"-shaped structure with a lower opening. When this structure is used in配合 each group of flow guiding plates 2212, it can ensure that the biogas bubbles rise into the gas collection hood 2213 and will not escape from the lower end of the gas collection hood 2213. The biogas collected in the gas collection hood 2213 is output through the 90° elbow 19 and the main biogas pipe 6.

[0088] When the side-stream circulating anaerobic reactor is filled with water, the water submerges to the top of the water collection tank 222. Continuing to feed water into the side-stream circulating anaerobic reactor, the water level continues to rise. When the water level is higher than the top of the water collection tank 222 and overflows into the water collection tank 222 (the water overflows from outside the water collection tank 222 into the water collection tank 222), the water in the water collection tank 222 is collected into the total water collection tank 223 and then flows out through the water outlet pipe 9 connected to the total water collection tank 223.

[0089] The embodiment of the present invention also provides a wastewater treatment method, which uses the above-mentioned side-stream circulating anaerobic reactor and includes the following steps:

[0090] Wastewater to be treated is injected into the full reaction chamber 1 through the inlet pipe 4. After reacting in the full reaction chamber, it enters the inlet culvert 211 from the circulating water outlet 12 and enters the reaction zone 21 through the water distribution hole 213. Under the lifting force of biogas, part of the mud-water mixture rises from the reaction zone 21 into the separation zone 22 and is separated by the three-phase separator 221. Biogas enters the full reaction chamber 1, sludge settles, and the treated wastewater rises into the effluent collection tank 222. Part of the mud-water mixture enters the effluent culvert 212 and enters the full reaction chamber 1 through the circulating water inlet 13, thus forming a circulation of mud-water mixture between the full reaction chamber 1 and the reaction zone 21.

[0091] In one embodiment of the present invention, the lateral flow velocity of the mud-water mixture at the bottom of the reaction zone 21 is ≥0.3 m / s.

[0092] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0093] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A side-flow circulating anaerobic reactor, characterized in that, include: The full reaction chamber includes a full reaction chamber body, a circulating water inlet and a circulating water outlet located at the lower part of the full reaction chamber body, and a water inlet pipe connected to the full reaction chamber body; The reaction separation chamber has an upper opening, and a partition wall is provided between the reaction separation chamber and the full reaction chamber. The lower part of the reaction separation chamber is the reaction zone, and the upper part is the separation zone. At the bottom ends of the reaction zone, an inlet culvert and an outlet culvert are provided opposite to each other. The inlet culvert is connected to the circulating water outlet, and the outlet culvert is connected to the circulating water inlet. Water distribution holes are provided at the bottom of the side walls of both the inlet culvert and the outlet culvert. The separation zone includes a three-phase separator and an outlet water collection tank, and the outlet water collection tank is located on top of the three-phase separator. It also includes a through-wall biogas pipe, which is installed in the partition wall between the full reaction chamber and the reaction separation chamber, connecting the biogas collected by the three-phase separator in the separation zone with the full reaction chamber, so that the biogas can be discharged to the full reaction chamber through the through-wall biogas pipe; It also includes a 90° elbow and a biogas main pipe; the 90° elbow is located in the full reaction chamber and is connected to the biogas pipe that passes through the wall, with the outlet of the 90° elbow facing downwards; The biogas main pipe passes through the top of the full reaction chamber and is connected to the full reaction chamber to output the biogas inside the full reaction chamber; The full reaction chamber is equipped with partition walls that divide the full reaction chamber into an even number of independent reaction zones. The bottom of the partition wall between the first independent reaction zone and the reaction separation chamber is equipped with a circulating water inlet, and the bottom of the partition wall between the last independent reaction zone and the reaction separation chamber is equipped with a circulating water outlet. The upper or lower part of the partition wall between two adjacent independent reaction zones is provided with flow holes, which are alternately arranged on the adjacent partition walls, and the water flow direction of the circulating water inlet and the circulating water outlet is either clockwise or counterclockwise. The outlet of the inlet pipe is located at the circulating water inlet that connects the outlet culvert to the first independent reaction zone.

2. The side-flow circulating anaerobic reactor as described in claim 1, characterized in that, A through-wall pump is installed below the liquid level at the top of the partition wall between the first independent reaction zone and the second independent reaction zone to direct the wastewater in the first independent reaction zone to the second independent reaction zone; The rated flow rate of the through-wall pump is ≥ 20 times the inlet flow rate; A return well is provided at the installation location of the through-wall pump. The return well is open at the top and closed at the bottom. A flow passage is provided on the well wall in the flow direction, and an equipment installation hole is provided on the partition wall in the flow direction.

3. The side-flow circulating anaerobic reactor as described in claim 1, characterized in that, The top of the partition wall between two adjacent independent reaction zones, above the liquid surface, is equipped with an air passage.

4. The side-flow circulating anaerobic reactor as described in claim 1, characterized in that, The top walls of the inlet and outlet culverts are inclined inward at an angle of 45° to 60° to the horizontal plane.

5. The side-flow circulating anaerobic reactor as described in claim 1, characterized in that, The three-phase separator includes a gas collection hood, a guide plate, and a guide beam. The guide beam is horizontally arranged and parallel to the water inlet culvert. One end of the guide beam is set on the partition wall between the reaction separation chamber and the full reaction chamber, and the other end is set on the body of the full reaction chamber. The gas collection hood is set on the top of the full reaction chamber. Each gas collection hood is connected to a guide plate on the left and right sides below it. The two guide plates on the left and right sides form a group. Each group of guide plates is arranged in a figure-eight shape. The lower end of each guide plate is connected to the guide beam. There are gaps between the guide plate and the gas collection hood, and between the guide plate and the guide beam.

6. The side-flow circulating anaerobic reactor as described in claim 5, characterized in that, The side-flow circulating anaerobic reactor also includes a total collection tank for collecting the wastewater collected in the effluent collection tank and allowing it to flow out. The total collection tank is located on the top of the reaction separation chamber body. The water collection tank is located on the upper part of the gas collection hood, outside the reaction separation chamber body. The water collection tank and the gas collection hood are integrated into one structure with an "H" shaped cross section.

7. A wastewater treatment method, characterized in that, The side-flow circulating anaerobic reactor according to any one of claims 1-6 comprises the following steps: Wastewater to be treated is injected into the full reaction chamber through the inlet pipe. After reaction in the full reaction chamber, it enters the inlet culvert from the circulating water outlet and enters the reaction zone through the water distribution hole. Under the lifting force of biogas, part of the mud-water mixture rises from the reaction zone into the separation zone and is separated by a three-phase separator. Biogas enters the full reaction chamber, sludge settles, and the treated wastewater rises into the effluent collection tank. Part of the mud-water mixture enters the effluent culvert and then enters the full reaction chamber through the circulating water inlet, thus forming a circulation flow of the mud-water mixture between the full reaction chamber and the reaction zone.

8. The wastewater treatment method as described in claim 7, characterized in that, The lateral flow velocity of the mud-water mixture at the bottom of the reaction zone is ≥0.3 m / s.

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