Lateral flow circulation anaerobic reactor and wastewater treatment method

Abstract

The invention discloses a sidestream circulation anaerobic reactor and a wastewater treatment method, and belongs to the technical field of sewage treatment. Comprising a circulating water inlet, a circulating water outlet and a water inlet pipe; the lower part of the reaction separation chamber is a reaction zone, and the upper part of the reaction separation chamber is a separation zone; a water inlet culvert and a water outlet culvert are formed in the bottom of the reaction area, the water inlet culvert is connected with the circulating water outlet, the water outlet culvert is connected with the circulating water inlet, and water distribution holes are formed in the bottoms of the culverts; the separation area comprises a three-phase separator and an effluent collecting tank, and the effluent collecting tank is arranged at the top of the three-phase separator; and the through-wall biogas pipe is arranged in a partition wall between the full reaction chamber and the reaction separation chamber. The reaction space is increased by optimizing partitions, a through-wall pump is adopted to replace a water inlet and distribution system, the circulation amount and the mixing contact effect are improved, the energy consumption is reduced, a three-phase separator is only arranged in a separation area, the structure is improved, the separation effect is improved, and treated wastewater does not need to enter an anaerobic sedimentation tank.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment, and particularly relates to a side-flow circulation anaerobic reactor and a wastewater treatment method. Background Art

[0002] Disclosing the information of this background art section is only intended to enhance the overall understanding of the present invention, and it is not necessarily regarded as an admission or an implication in any form that this information constitutes the prior art already known to those of ordinary skill in the art.

[0003] Anaerobic biological treatment is suitable for treating high-concentration organic wastewater. By utilizing the metabolic characteristics of anaerobic microorganisms, without the need to provide external energy, the reduced organic matter is used as the hydrogen acceptor, and at the same time, methane gas with energy value is generated. An anaerobic reactor is the core carrier for anaerobic biological treatment of sewage. The microorganisms in the anaerobic sludge come into contact with and adsorb and decompose the organic matter in the sewage, so that the sewage can be purified and useful biogas resources can be produced.

[0004] An upflow anaerobic sludge bed reactor (abbreviated as UASB) includes an influent distribution area, a reaction area, and a solid-liquid-gas three-phase separation area. The reaction area of the UASB includes a sludge bed and a suspended sludge area. Sewage enters from the bottom of the UASB and comes into contact with the sludge bed and the suspended sludge area. Microorganisms adsorb and decompose the organic matter in the sewage, and at the same time, biogas is generated. The mixture of sludge, water, and gas rises to the solid-liquid-gas three-phase separator. When the biogas bubbles hit the reflection plate at the lower part of the three-phase separator, they turn towards the gas collection chamber and are then separated and discharged; the sludge and water enter the precipitation area of the three-phase separator. Under the action of gravity, the supernatant is discharged from the water outlet, and the sludge returns to the reaction area along the inclined wall. An internal circulation anaerobic reactor (abbreviated as IC) is similar to two UASBs connected in series. It consists of two upper and lower reaction chambers. The IC reactor uses the biogas generated by itself as the power for lifting to achieve the internal circulation of the mixed liquid, and it is the anaerobic reactor mainly used in the mainstream.

[0005] Compared with UASB, the advantages of IC are that it can dilute the influent through internal circulation, has good shock resistance, high volumetric loading, short residence time, stable operation, low investment, and small floor area. The disadvantages are as follows: it requires a complex influent distribution system; the height-diameter ratio of IC is large, generally reaching 4 - 8, and a circulation pump needs to be added to cooperate with the influent pump to maintain the upward flow velocity of the water in the anaerobic reactor, resulting in high power consumption and operating costs; a three-phase separator needs to be set up across the entire cross-section of the reactor and the structure of the three-phase separator is complex; when the biodegradability of the sewage is not very good, due to the short hydraulic residence time, the removal rate is lower than that of UASB; the upward flow velocity of the water is relatively fast, resulting in more fine particulate matter in the effluent, and an anaerobic sedimentation tank needs to be added later, increasing the construction cost of the treatment system. Summary of the Invention

[0006] In order to solve the deficiencies of the prior art, the object of the present invention is to provide a side-stream circulating anaerobic reactor and a wastewater treatment method. The side-stream circulating anaerobic reactor provided by the present invention is a rectangular anaerobic reactor made of reinforced concrete. By optimizing the functional plane partition of the reactor, the reaction zone space is increased, the complex influent and makeup water system is cancelled, the energy consumption is reduced, the three-phase separator is only set in some areas, and the structure of the three-phase separator is improved to enhance the effect of the three-phase separator, and there is no need to set an anaerobic sedimentation tank after the reactor.

[0007] In order to achieve the above object, the technical solution of the present invention is as follows: In the first aspect of the present invention, a side-stream circulating anaerobic reactor is provided, including: A full reaction chamber, including a full reaction chamber body, a circulating water inlet and a circulating water outlet provided at the lower part of the full reaction chamber body, and an influent pipe connected to the full reaction chamber body; A reaction separation chamber with an open top, and there is a partition wall between the reaction separation chamber and the full reaction chamber; the lower part of the reaction separation chamber is a reaction zone and the upper part is a separation zone; at both ends of the bottom of the reaction zone, an influent culvert and an effluent culvert are oppositely arranged, the influent culvert is connected to the circulating water outlet, and the effluent culvert is connected to the circulating water inlet; water distribution holes are provided at the bottom of the side walls of the influent culvert and the effluent culvert; the separation zone includes a three-phase separator and an effluent collection tank, and the effluent collection tank is arranged on top of the three-phase separator; It also includes a wall-piercing biogas pipe, which is arranged 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 is discharged to the full reaction chamber through the wall-piercing biogas pipe.

[0008] In some embodiments of the present invention, a partition wall is provided in the entire reaction chamber, dividing the entire reaction chamber into an even number of independent reaction zones. A circulating water inlet is provided at the bottom of the partition wall between the first independent reaction zone and the reaction separation chamber, and a circulating water outlet is provided at the bottom of the partition wall between the last independent reaction zone and the reaction separation chamber; Overflow holes are provided in the upper or bottom part of the partition wall between two adjacent independent reaction zones. The overflow holes are alternately arranged up and down on the adjacent partition walls, and the water flow directions of the circulating water inlet and the circulating water outlet are the same, either clockwise or counterclockwise; The outlet of the water inlet pipe is arranged at the circulating water inlet where the water outlet culvert is connected to the first independent reaction zone.

[0009] In some embodiments of the present invention, a wall-piercing 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 directing the sewage in the first independent reaction zone to the second independent reaction zone; The rated flow of the wall-piercing pump ≥ 20 times the influent flow rate; A reflux well is provided at the installation position of the wall-piercing pump. The reflux well has an open upper end and a closed lower end. Overflow holes are provided on the well wall in the inflow direction, and equipment installation holes are provided on the partition wall in the outflow direction.

[0010] In some embodiments of the present invention, air vent holes are provided above the liquid level at the top of the partition wall between two adjacent independent reaction zones.

[0011] In some embodiments of the present invention, the top walls of the influent culvert and the effluent culvert form an angle of 45° - 60° with the horizontal plane and incline inward.

[0012] In some embodiments of the present invention, 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 influent culvert. One end of the guide beam is arranged on the partition wall between the reaction separation chamber and the entire reaction chamber, and the other end is arranged on the body of the entire reaction chamber; the gas collection hood is arranged on the top of the entire reaction chamber. One guide plate is connected to the left and right sides below each gas collection hood. The left and right guide plates form a group, and each group of guide plates is arranged in a "V" 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 collection hood, and between the guide plate and the guide beam.

[0013] In some embodiments of the present invention, the side-stream circulating anaerobic reactor further includes a 90° elbow and a biogas main pipe; the 90° elbow is arranged in the entire reaction chamber and connected to the wall-piercing biogas pipe, and the outlet of the 90° elbow faces downward; The biogas main pipe passes through the top of the entire reaction chamber and is connected to the entire reaction chamber for outputting the biogas in the entire reaction chamber.

[0014] In some embodiments of the present invention, the side stream circulation anaerobic reactor further comprises a total water collection tank, which is used to collect the sewage collected by the outlet water collection tank and flow it out, and the total water collection tank is arranged at the outer top of the reaction and separation chamber body; The water outlet collecting trough is arranged on the upper part of the gas collecting hood and is located outside the reaction separation chamber body. The water outlet collecting trough and the gas collecting hood are integrated structures, and the cross section is "H" shaped.

[0015] The second aspect of the present invention provides a wastewater treatment method, using the above-mentioned side stream circulation anaerobic reactor, comprising the following steps: The wastewater to be treated is injected into the whole reaction chamber through the water inlet pipe. After the reaction in the whole reaction chamber, it enters the water inlet culvert from the circulating water outlet and enters the reaction zone through the water distribution hole. Under the lifting force of the biogas, part of the mud-water mixture rises from the reaction zone into the separation zone and is separated by the three-phase separator. The biogas enters the whole reaction chamber, the sludge sinks, and the treated wastewater rises to the outlet sump; part of the mud-water mixture enters the outlet culvert and enters the whole reaction chamber through the circulating water inlet, thereby forming a circulation of the mud-water mixture between the whole reaction chamber and the reaction zone.

[0016] 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.

[0017] The beneficial effects of the present invention are: The present invention provides a side-stream circulation anaerobic reactor, which has the following beneficial effects compared with the traditional anaerobic reactors UASB and IC: the present invention increases the total space of the reaction zone by optimizing the functional plane partition of the reactor. The side-stream circulation anaerobic reactor is a rectangular tank body with a compact layout. In particular, for large-scale sewage treatment projects, multiple anaerobic reactors can be built together with the same wall to save land and construction costs. By optimizing the functional plane partition of the reactor, a three-phase separator is only set in the separation zone, and the structure of the gas collecting hood ("冂" shaped structure) in the three-phase separator is improved to avoid biogas leakage, so that the mud-water mixture forms a microcirculation in the separation zone, and there is no need to export the sludge. The mud-water mixture rises and the precipitated sludge falls. Since the sludge reflux channel does not conflict with the mud-water mixed liquid upflow channel, the sedimentation separation effect is good, and there is no need to set an anaerobic sedimentation tank after the anaerobic reactor. The circulation flow direction of the mud-water mixed liquid is in the lateral direction of its bottom and the lateral direction of its side relative to the three-phase separator, which does not affect the longitudinal three-phase separation effect of the three-phase separator.

[0018] The side stream circulation anaerobic reactor is a rectangular tank body that can be made of reinforced concrete structure, which has better anti-corrosion and heat preservation effects than steel structure. A micro-lift and large-flow through-the-wall pump is used to control the flow direction and flow rate of the mud-water mixture, which increases the circulation volume and mixing contact effect, eliminates the complex water inlet finger distribution system, does not need to set up a circulation pipeline, and has low energy consumption.

[0019] The side-stream circulating anaerobic reactor forms a water seal by setting a wall-piercing biogas pipe and a 90° elbow. The wall-piercing biogas pipe is connected to the 90° elbow with its opening facing downwards, enabling biogas to be discharged from the gas collection hood to the independent reaction zone, while the muddy water mixture in the gas collection hood cannot flow to the independent reaction zone along with the biogas stream. There is no need to set up a biogas collection pipe, a dedicated biogas gas-liquid separator, or a water seal tank for forming the gas chamber of the three-phase separator. Brief Description of the Drawings

[0020] The specification drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0021] Figure 1 It is a plan schematic diagram of the side-stream circulating anaerobic reactor provided by the embodiment of the present invention; Figure 2 It is a longitudinal sectional schematic diagram of the entire reaction chamber of the side-stream circulating anaerobic reactor provided by the embodiment of the present invention; Figure 3 It is a longitudinal sectional schematic diagram of the reaction separation zone of the side-stream circulating anaerobic reactor provided by the embodiment of the present invention; Figure 4 It is an overall longitudinal sectional schematic diagram of the side-stream circulating anaerobic reactor provided by the embodiment of the present invention; Figure 5 It is a semi-closed structure diagram formed by the baffle plates in the side-stream circulating anaerobic reactor provided by the embodiment of the present invention.

[0022] The meanings of the reference symbols in the drawings are as follows: 1 - entire reaction chamber, 11 - entire reaction chamber body, 12 - circulating water inlet, 13 - circulating water outlet, 14 - flow-through hole, 15 - wall-piercing pump, 16 - return well, 17 - equipment installation hole, 18 - air passage hole, 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; 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 - baffle plate, 2213 - gas collection trough, 2214 - guide corbel, 2215 - trapezoidal plate, 222 - outlet water collection trough, 223 - total water collection trough; 3 - partition wall; 4 - inlet pipe; 5 - wall-piercing biogas pipe; 6 - main biogas pipe; 7 - construction manhole; 8 - airtight top cover 9 - Outlet pipe. Detailed implementation manners

[0023] One of the cores of the present invention is to provide a side - flow circulating anaerobic reactor. The structural design of this device enables it to save land and construction costs, eliminates the complex influent water distribution system, does not require the setting of circulation pipelines, has low energy consumption, and high three - phase separation effect.

[0024] Another core of the present invention is to provide a wastewater treatment method based on the above - mentioned side - flow circulating anaerobic reactor.

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention. Please refer to Figures 1-4 , Figure 1 , which is a plan view of the side - flow circulating anaerobic reactor provided by the embodiment of the present invention. Figure 2 , which is a longitudinal sectional view of the full reaction chamber of the side - flow circulating anaerobic reactor provided by the embodiment of the present invention. Figure 3 , which is a longitudinal sectional view of the reaction separation area of the side - flow circulating anaerobic reactor provided by the embodiment of the present invention. Figure 4 , which is a longitudinal sectional view of the whole side - flow circulating anaerobic reactor provided by the embodiment of the present invention.

[0026] An embodiment of the present invention discloses a side - flow circulating anaerobic reactor, which includes a full reaction chamber 1 and a reaction separation chamber 2 with an upper opening.

[0027] Among them, the full reaction chamber 1 includes a full reaction chamber body 11, a circulating water inlet 12 and a circulating water outlet 13 arranged 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 the wastewater to be treated and provide a place for the reaction of sludge and the wastewater to be treated.

[0028] Among them, a partition wall 3 is provided between the reaction separation chamber 2 and the full reaction chamber 1; the lower part of the reaction separation chamber 2 is a reaction zone 21, and the upper part is a separation zone 22; at both ends of the bottom of the reaction zone 21, a water inlet culvert 211 and a water outlet culvert 212 are oppositely arranged, the water inlet culvert 211 is connected to the circulating water outlet 13, and the water 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 the water inlet culvert 211 and the water outlet culvert 212; the separation zone 22 includes a three-phase separator 221 and a water outlet collecting tank 222, and the water outlet collecting tank 222 is arranged on top of the three-phase separator 221. The reaction zone 21 of the reaction separation chamber 2 is used to provide a reaction site for the mud-water mixture in the full reaction chamber 1, and the separation zone 22 is used to separate sludge, wastewater and biogas to obtain treated sewage.

[0029] The side-flow circulating anaerobic reactor further includes a wall-piercing biogas pipe 5, which is arranged in the partition wall 3 between the full reaction chamber 1 and the reaction separation chamber 2, connecting the biogas collected by the three-phase separator 221 in the separation zone 22 with the full reaction chamber 1, so that the biogas is discharged to the full reaction chamber 1 through the wall-piercing biogas pipe 5.

[0030] It should be noted that the water inlet culvert 211 and the water outlet culvert 212 have the same structure. One is for water inlet and the other is for water outlet in the side-flow circulating anaerobic reactor, and they are named according to the flow direction of the mud-water mixture in the side-flow circulating anaerobic reactor. If the water outlet direction in the full reaction chamber 1 changes (that is, the circulating water inlet 12 and the circulating water outlet 13 are swapped), the positions of the water inlet culvert 211 and the water outlet culvert 212 remain unchanged, but their functions are swapped, and correspondingly, their names are also swapped.

[0031] Specifically, as Figures 1-4 shown, in the embodiment of the present invention, the side-flow circulating anaerobic reactor is a rectangular pool body, and the reaction separation chamber 2 is arranged on one side of the full reaction chamber 1, and their heights are quite the same. A reinforced concrete structure can be adopted, and its anti-corrosion and heat preservation effects are better than those of a steel structure.

[0032] It can be seen that compared with the prior art, the side-flow circulating anaerobic reactor provided by the embodiment of the present invention has a reasonable layout and a compact structure. Especially for large-scale sewage treatment projects, multiple anaerobic reactors can be built with a common wall, saving land and construction costs. The side-flow circulating anaerobic reactor provided by the embodiment of the present invention improves the space of the reaction zone 22 by optimizing the functional plane partition of the reactor, and improves the sewage treatment effect.

[0033] Specifically, in the embodiment of the present invention, as Figure 1 and Figure 2As shown, a partition wall 3 is provided in the full reaction chamber 1, dividing the full reaction chamber 1 into an even number of independent reaction zones 110. A circulating water inlet 12 is provided at the bottom of the partition wall 3 between the first independent reaction zone 110 and the reaction separation chamber 2, and a circulating water outlet 103 is provided at the bottom of the partition wall between the last independent reaction zone 110 and the reaction separation chamber 2; An overflow hole 14 is provided at the top or bottom of the partition wall 3 between two adjacent independent reaction zones 110.

[0034] To avoid flow interruption, the overflow holes 14 are alternately arranged up and down on adjacent partition walls 3, and the water flow directions of the circulating water inlet and the circulating water outlet are the same, either clockwise or counterclockwise, so that the flow state in the independent reaction zone 110 is a clockwise (or counterclockwise) swirl from top (or bottom).

[0035] It should be noted that the overflow holes 14 provided in the upper part of the partition wall 3 between two adjacent independent reaction zones 110 should not be too high, and should be avoided being set at the top of the partition wall 3. It can be set at the liquid level or below the liquid level to avoid the liquid level in the full reaction chamber 1 being too high and the wastewater flowing back into the reaction separation chamber 2 through the wall-piercing biogas pipe 5.

[0036] It should be noted that the overflow holes between the partition walls are collectively referred to as the overflow holes 14. The number of overflow holes 14 is large and not distinguished.

[0037] As Figure 2 shown, three partition walls 3 are provided in the full reaction chamber 1, dividing the full reaction chamber 1 into 4 independent reaction zones 110. If the sewage flows clockwise between the full reaction chamber 1 and the reaction zone 21, in the direction of sewage flow, the 4 independent reaction zones 110 are 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 from left to right in sequence. The circulating water inlet 12 is provided at the bottom of the first independent reaction zone 1101, so the first independent reaction zone 1101 can be with water inlet from the bottom and water outlet from the top, that is, the overflow holes on the partition wall 3 between the first independent reaction zone 1101 and the second independent reaction zone 1102 are provided in the upper part. And so on, the second independent reaction zone 1102 is with water inlet from the top and water outlet from the bottom, then the overflow holes on the partition wall 3 between the second independent reaction zone 1102 and the third independent reaction zone 1103 are provided in the lower part; the third independent reaction zone 1102 is with water inlet from the bottom and water outlet from the top, then the overflow holes on the partition wall 3 between the third independent reaction zone 1103 and the fourth independent reaction zone 1104 are provided in the upper part.

[0038] It should be noted that the number of independent reaction zones 110 in the full reaction chamber 1 being an even number is sufficient, and can be 2, 4, 6, 8, etc., which can be determined according to actual needs.

[0039] Specifically, in the embodiment of the present invention, as Figure 2As shown, the outlet of the water inlet pipe 4 is arranged at the circulating water inlet 12 where the water outlet culvert 212 communicates with the first independent reaction zone 110. Water is inlet at this position, and the newly added wastewater to be treated does not affect the flow direction of the muddy water mixture in the entire reaction chamber 1, improving the treatment effect of the wastewater.

[0040] Furthermore, as Figure 2 shown, in order to ensure the circulating flow direction of the muddy water mixture in the entire reaction chamber 1 and the reaction zone 21, a through-wall pump 15 is provided below the liquid level at the top of the partition wall 3 between the first independent reaction zone 110 and the second independent reaction zone 110, for directing the sewage in the first independent reaction zone 110 to the second independent reaction zone 110; The rated flow of the through-wall pump 15 ≥ 20 times the inlet flow rate; A return well 16 is provided at the installation position of the through-wall pump 15. The return well 16 has an open top and a closed bottom. Flow-through holes 14 are provided on the well wall in the inflow direction, and equipment installation holes 17 are provided on the partition wall 3 in the outflow direction.

[0041] It should be noted that the through-wall pump 15 can be a micro-head and large-flow through-wall pump. Under the action of the through-wall pump 15, the muddy water mixture flows through the first and last independent reaction zones 110 in sequence, enters the water inlet culvert 211 from the circulating water outlet 12, flows into the reaction zone 21 through the water distribution holes 213, and flows out of the reaction zone 21 through the water distribution holes 213 of the other water outlet culvert 212, through the water outlet culvert 212, and the circulating water inlet 11, and enters the first independent reaction zone 110, thus forming a circulating flow of the muddy water mixture between the independent reaction zone 110 and the reaction zone 21.

[0042] In an embodiment of the present invention, air holes 18 are provided above the liquid level at the top of the partition wall 3 between two adjacent independent reaction zones 110. The air holes 18 connect the tops above the liquid level of the independent reaction zones 110 in series as a whole, which is beneficial to collecting and outputting the biogas generated during the wastewater treatment process.

[0043] In an embodiment of the present invention, the top walls of the water inlet culvert 211 and the water outlet culvert 212 form an angle of 45° - 60° with the horizontal plane and incline inward. The structures of the water inlet culvert 211 and the water outlet culvert 212 are symmetrical, and a plurality of water distribution holes 213 are provided at the bottoms of the side walls of the water inlet culvert 211 and the water outlet culvert 212. The number of water distribution holes 213 can be determined according to the lengths of the water inlet culvert 211 and the water outlet culvert 212.

[0044] In an embodiment of the present invention, as Figure 3 、 Figure 4As shown in the figure, the three-phase separator 221 includes a gas collecting 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 arranged on the partition wall 3 between the reaction separation chamber 2 and the full reaction chamber 1, and the other end is arranged on the body of the full reaction chamber 2; the gas collecting hood 2213 is arranged on the top of the full reaction chamber 2. One guide plate 2212 is connected to the left and right sides below each gas collecting hood 2213. The left and right two guide plates 2212 form a group, and each group of guide plates 2212 is arranged in a "V" shape. The lower end of each guide plate 2212 is connected to the guide beam 2211, and there are gaps between the guide plate 2212 and the gas collecting hood 2213, and between the guide plate 2212 and the guide beam 2211.

[0045] It should be noted that the distance between the upper ends of each group of guide plates 2212 is less than the distance of the lower end opening of the gas collecting hood 2213, ensuring that the biogas rises through each group of guide plates 2212 into the gas collecting hood 2213 and preventing the biogas from escaping.

[0046] It should be noted that the cross-section of the guide beam 2211 can be diamond-shaped or triangular. The guide beam 2211 is used to fix the guide plate 2212 and plays a supporting role. The guide plate 2212 forms an angle of 45° - 60° with the horizontal plane. The ends of each group of guide plates 2212 are connected with materials of the same material as the guide plate 2212 to form a semi-closed structure to prevent the collected biogas from leaking from both ends of the guide plate 2212. The semi-closed structure is a trapezoidal structure, and the two ends of the two guide plates 2212 are enclosed by a trapezoidal plate 2215 respectively, forming a long trapezoidal structure with openings at the top and bottom and enclosed on all sides, as Figure 5 shown.

[0047] It should be noted that in the translation of the description of the "V" shape of the guide plate in the original text, it is more appropriate to use "V" shape in English, but considering that the original text may be a misdescription, it is translated according to the text. If it is a misdescription, it is recommended to correct the original text for more accurate understanding and translation.Gaps are provided between the guide plate 2212 and the gas collecting hood 2213, and between the guide plate 2212 and the guide beam 2211. The gap between the guide plate 2212 and the gas collecting hood 2213 is used for the mud-water mixture to pass through. The three-phase separator 221 of the present invention is used to separate biogas, sludge and sewage, and its separation principle is similar to the separation principle of the aerated sedimentation tank. Under the lifting force of biogas, the mud-water mixture mixed with biogas bubbles rises from the bottom of the guide plate 2212, and under the action of gas lift, the mud-water mixture rises quickly. Because the guide plate 2212 has a certain angle, the mud-water mixture continuously impacts the guide plate 2212 during the rising process to generate more biogas bubbles, fully realizing the separation of biogas. Because the distance between the upper ends of each group of guide plates 2212 is less than the distance between the lower openings of the gas collecting hood 2213, the biogas bubbles directly enter the gas collecting hood 2213 upward, realizing the collection of biogas and preventing biogas from escaping. It can be understood that the height of the guide plate 2212 in the present invention is consistent with the height of the traditional three-phase separator, and the higher height can fully separate the biogas. The mud-water mixture from which the biogas is separated enters the top of the guide plate 2212 through the gap between the guide plate 2212 and the gas collecting hood 2213 and begins to precipitate and separate, where the sludge particles settle downward due to their high density, thereby achieving effective separation of sludge and wastewater. The precipitated and separated sludge flows back to the bottom of the guide plate 2212 through the gap between the guide plate 2212 and the guide beam 2211 under the action of gravity, and the wastewater from which the sludge is separated rises to the outlet sump 222 and is discharged. Since the sludge reflux channel does not conflict with the mud-water mixture rising channel, the sludge sedimentation and separation effect is good, and there is no need to set up an anaerobic sedimentation tank after the side stream circulation anaerobic reactor.

[0048] Preferably, the three-phase separator 221 further includes a guide bracket 2214 .

[0049] It should be noted that the guide bracket 2214 is also called a bracket beam, and its shape is half of the guide beam 2211 (cut longitudinally), and its function is exactly the same as that of the guide beam 2211, and it also has the function of guiding and supporting. However, the guide bracket 2214 is closely attached to the inner wall of the reaction and separation chamber 2, so its structure is half of the guide beam 2211. The guide bracket is integrated with the pool wall of the adjacent reaction and separation chamber 2, which is equivalent to the protrusion of the wall.

[0050] In one embodiment of the present invention, Figure 1 , Figure 2 and Figure 4 As shown, the side stream circulation anaerobic reactor further includes a 90° elbow 19 and a biogas main pipe 6; the 90° elbow 19 is arranged in the full reaction chamber 1 and connected to the through-wall biogas pipe 5, and the outlet of the 90° elbow 19 faces downward; The biogas main pipe 6 passes through the top of the whole reaction chamber 1 and is connected to the whole reaction chamber 1 , and is used for outputting the biogas in the whole reaction chamber 1 .

[0051] It should be noted that the through-wall biogas pipe 5 is connected to the 90° elbow 19 with its mouth facing downward to form a water seal, so that the biogas can be discharged from the gas collecting hood 2213 to the independent reaction zone 110, while the mud-water mixture in the gas collecting hood 2213 cannot flow to the independent reaction zone 110 along with the biogas. A water seal tank for the air chamber of the gas collecting hood 2213 can be formed without setting up a special biogas gas-water separator.

[0052] In one embodiment of the present invention, Figure 1 , Figure 3 and Figure 4 As shown, the side stream circulation anaerobic reactor further includes a total water collection tank 223, which is used to collect the sewage collected by the outlet water collection tank 222 and flow out, and the total water collection tank 223 is arranged on the outer top of the reaction and separation chamber 1 body; The water outlet trough 222 is arranged on the upper part of the gas collecting hood 2213, and is located outside the reaction separation chamber 2 body. The water outlet trough 222 and the gas collecting hood 2213 are integrated structures, and the cross section is "H" shaped.

[0053] It should be noted that the air collecting hood 2213 and the water collecting tank 222 are integrated structures, and the cross-section is "H"-shaped, the upper half is the water collecting tank 222, and the lower half is the air collecting hood 2213.

[0054] The gas collecting hood 2213 is a "冂"-shaped structure with a lower opening. When this structure is used in conjunction with each set of guide plates 2212, it can ensure that the biogas bubbles rise into the gas collecting hood 2213 and will not escape from the lower end of the gas collecting hood 2213. The biogas collected in the gas collecting hood 2213 is output through the 90° elbow 19 and the biogas main pipe 6.

[0055] When the side stream circulation anaerobic reactor is filled with water, the water submerges the top of the water collecting tank 222. As water continues to flow into the side stream circulation anaerobic reactor, the water level continues to rise, the water level is higher than the top of the water collecting tank 222 and overflows into the water collecting tank 222 (water overflows from the outside of the water collecting tank 222 into the water collecting tank 222), and the water in the water collecting tank 222 is collected in the main water collecting tank 223, and then flows out from the outlet pipe 9 connected to the main water collecting tank 223.

[0056] The embodiment of the present invention further provides a wastewater treatment method, which uses the above-mentioned side stream circulation anaerobic reactor and includes the following steps: Inject the wastewater to be treated into the full reaction chamber 1 through the water inlet pipe 4. After reacting in the full reaction chamber, it enters the water inlet culvert 211 from the circulating water outlet 12, enters the reaction zone 21 through the water distribution holes 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. The biogas enters the full reaction chamber 1, the sludge sinks, and the treated wastewater rises into the water outlet collecting tank 222; part of the mud-water mixture enters the water outlet culvert 212 and enters the full reaction chamber 1 through the circulating water inlet 13, thereby forming a circulating flow of the mud-water mixture between the full reaction chamber 1 and the reaction zone 21.

[0057] In an 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.

[0058] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. For the same or similar parts among the embodiments, reference can be made to each other.

[0059] The above description is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and replacements can be made, and these improvements and replacements should also be regarded as the protection scope of the present invention.

Claims

1. A side-stream circulating anaerobic reactor, characterized in that, Comprising: A full reaction chamber, including a full reaction chamber body, a circulating water inlet and a circulating water outlet provided at the lower part of the full reaction chamber body, and a water inlet pipe connected to the full reaction chamber body; A reaction separation chamber with an upper opening, a partition wall is provided between the reaction separation chamber and the full reaction chamber; the lower part of the reaction separation chamber is a reaction zone, and the upper part is a separation zone; at both ends of the bottom of the reaction zone, a water inlet culvert and a water outlet culvert are oppositely arranged, the water inlet culvert is connected to the circulating water outlet, and the water outlet culvert is connected to the circulating water inlet; water distribution holes are provided at the bottom of the side walls of the water inlet culvert and the water outlet culvert; the separation zone includes a three-phase separator and a water outlet collecting tank, and the water outlet collecting tank is arranged on the top of the three-phase separator; It further includes a wall-piercing biogas pipe, which is arranged 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 is discharged to the full reaction chamber through the wall-piercing biogas pipe.

2. The side-stream circulating anaerobic reactor according to claim 1, wherein, A partition wall is provided in the full reaction chamber, dividing the full reaction chamber into an even number of independent reaction zones. A circulating water inlet is provided at the bottom of the partition wall between the first independent reaction zone and the reaction separation chamber, and a circulating water outlet is provided at the bottom of the partition wall between the last independent reaction zone and the reaction separation chamber; Overflow holes are provided at the upper part or bottom of the partition wall between two adjacent independent reaction zones, the overflow holes are alternately arranged up and down on the adjacent partition walls, and the water flow directions of the circulating water inlet and the circulating water outlet are the same, either clockwise or counterclockwise; The outlet of the water inlet pipe is arranged at the circulating water inlet where the water outlet culvert is connected to the first independent reaction zone.

3. The side-stream circulating anaerobic reactor according to claim 2, wherein A wall-piercing 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 directing the sewage in the first independent reaction zone to the second independent reaction zone; The rated flow of the wall-piercing pump ≥ 20 times the inlet flow; A return well is provided at the installation position of the wall-piercing pump, the return well has an upper opening and a closed bottom, overflow holes are provided on the well wall in the inflow direction, and equipment installation holes are provided on the partition wall in the outflow direction.

4. The side-stream circulating anaerobic reactor according to claim 2, wherein, Gas passing holes are provided above the liquid level at the top of the partition wall between two adjacent independent reaction zones.

5. The side-stream circulating anaerobic reactor according to claim 1, characterized in that, The top walls of the water inlet culvert and the water outlet culvert form an angle of 45° - 60° with the horizontal plane and are inclined inward.

6. The side-stream circulating anaerobic reactor according to claim 1, characterized in that, The three-phase separator includes a gas collecting hood, a deflector plate and a deflector beam; the deflector beam is horizontally arranged and parallel to the water inlet culvert, one end of the deflector beam is arranged on the partition wall between the reaction separation chamber and the full reaction chamber, and the other end is arranged on the body of the full reaction chamber; the gas collecting hood is arranged on the top of the full reaction chamber, and each gas collecting hood is connected with a deflector plate on the left and right below, the left and right deflector plates form a group, each group of deflector plates is arranged in an "eight" shape, the lower end of each deflector plate is connected to the deflector beam, and gaps are provided between the deflector plate and the gas collecting hood and between the deflector plate and the deflector beam.

7. The side-stream circulating anaerobic reactor according to claim 6, wherein, The side-flow circulating anaerobic reactor further includes a 90° elbow and a biogas main pipe; the 90° elbow is arranged in the full reaction chamber and connected to the wall-piercing biogas pipe, and the outlet of the 90° elbow faces downward; The biogas main pipe passes through the top of the full reaction chamber and is connected to the full reaction chamber for outputting the biogas in the full reaction chamber.

8. The side-stream circulating anaerobic reactor according to claim 6, characterized in that, The side-flow 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; 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.

9. A wastewater treatment method, characterized in that, Using the side-flow circulating anaerobic reactor according to any one of claims 1-8, the method includes the following steps: Inject the wastewater to be treated into the whole reaction chamber through the inlet pipe. After reacting in the whole reaction chamber, it enters the inlet 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 and is separated by the three-phase separator. The biogas enters the whole reaction chamber, the sludge sinks, and the treated wastewater rises into the effluent collection tank; Part of the mud-water mixture enters the outlet culvert and enters the whole reaction chamber through the circulating water inlet, thereby forming a circulating flow of the mud-water mixture between the whole reaction chamber and the reaction zone.

10. The wastewater treatment method according to claim 9, characterized in that, The horizontal flow velocity of the mud-water mixture at the bottom of the reaction zone is ≥ 0.3 m / s.

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