Domestic sewage treatment device with internal circulation anaerobic membrane bioreactor

Abstract

The utility model discloses an internal circulation anaerobic membrane bioreactor domestic sewage treatment device which comprises a reactor, an anaerobic activated sludge area and a membrane separation area are arranged in the reactor, and the membrane separation area comprises a primary membrane separation mechanism; the primary membrane separation mechanism comprises a driving part, a transmission part, a rotary drum and a plurality of membrane assemblies; and an aeration mechanism is arranged outside the reactor. The anaerobic activated sludge area is used for degrading organic matters in sewage and generating biogas; the inner circulating pipe is used for refluxing a mud-water mixture in the gas-liquid separator to the lower part of the anaerobic activated sludge area for retreatment; when the reactor is cleaned, the driving piece drives the rotary drum to drive the suspended ball filler and the first flat sheet membrane to rotate synchronously to collide with clear water, and the impact force generated during collision washes away biofilms and blockages on the membrane assembly; and meanwhile, bubbles generated by the aeration mechanism further increase the scouring force of clear water to blockages, so that the effect of efficiently cleaning the membrane module is achieved, and the continuous sewage purification effect of the reactor is guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of domestic sewage treatment, in particular to a domestic sewage treatment device of an internal circulation anaerobic membrane bioreactor. Background Art

[0002] The anaerobic membrane bioreactor is a new, highly efficient wastewater treatment technology that effectively combines membrane separation technology with anaerobic biochemical treatment units. It can effectively address the challenges of traditional anaerobic biochemical methods. The membrane effectively intercepts microorganisms within the reactor, preventing sludge loss and ensuring a high sludge concentration. Furthermore, the membrane's efficient interception of colloids and macromolecular organic matter enhances the reactor's treatment effectiveness and maintains stable effluent quality.

[0003] However, membrane fouling is a major problem in the application of anaerobic membrane bioreactors. In existing anaerobic membrane bioreactors, contaminants in the sludge mixture within the reactor gradually clog the membrane pores during the membrane filtration process, causing membrane fouling. This increases filtration resistance, which in turn reduces the efficiency of the anaerobic membrane bioreactor and increases running and operating costs. Utility Model Content

[0004] The utility model aims to provide an internal circulation anaerobic membrane bioreactor domestic sewage treatment device to solve the problem in the prior art that pollutants in the sludge mixed liquid in the reactor clog the membrane pores and cause membrane pollution.

[0005] In order to achieve the above-mentioned utility model purpose, the technical solution of the utility model is:

[0006] A domestic sewage treatment device with an internal circulation anaerobic membrane bioreactor includes a reactor, a membrane separation zone is provided in the reactor, and the membrane separation zone includes a primary membrane separation mechanism; the primary membrane separation mechanism includes a driving member, a transmission member, a rotating drum and a plurality of membrane assemblies, the driving member and the transmission member are located outside the reactor, the interior of the rotating drum is hollow and horizontally arranged in the reactor, and one end of the rotating drum is rotatably connected to the driving member through the transmission member after passing through the reactor; the membrane assembly includes a plurality of membrane channels and a first flat membrane, the first flat membranes are evenly spaced along the circumference of the rotating drum, the membrane channels are detachably connected to the rotating drum, the membrane channels are hollow and located between adjacent first flat membranes, and each membrane channel is filled with a plurality of suspended ball fillers; an aeration mechanism is provided outside the reactor, the aeration mechanism includes an aeration pump, an aeration pipe and a plurality of aerators, a first rotary joint is provided at one end of the rotating drum passing through the reactor, the aeration pump and the first rotary joint are connected through the aeration pipe, and the aerator is connected to the rotating drum. When cleaning the reactor, clean water enters the reactor, and the driving part drives the drum to cause the suspended ball filler and the first flat membrane to rotate synchronously and beat and break up the clean water. The impact force generated by beating the water washes away the film and blockages on the membrane assembly; at the same time, the bubbles generated by the aeration mechanism further increase the flushing force of the clean water on the blockage, making it difficult for suspended particles in the sewage to deposit on the membrane assembly, speeding up the cleaning speed and ensuring the reactor's continuous sewage purification effect. Disassembling the connected membrane channels can not only concentrate the suspended ball fillers, but also facilitate the replacement of damaged suspended ball fillers at any time; the hollow membrane channels have a larger surface area and porosity, which facilitates the formation of microbial films in the sewage, reduces microbial loss, and improves the treatment efficiency of the microbial membrane. The suspended ball fillers and the first flat membrane can further treat the sewage and speed up the sewage treatment process.

[0007] Preferably, the reactor is provided with a water outlet at its top end, a water collection tank located at the outlet, an overflow port disposed on the water collection tank, and a reflux pump installed within the water collection tank. A spray pipe is disposed horizontally above the primary membrane separation mechanism, equipped with a plurality of nozzles. One end of the spray pipe passes through the reactor and is connected to the reflux pump. The spray pipe and nozzles flush the membrane assembly, accelerating its cleaning. The water used for spraying is clean water treated in the reactor and is recycled, conserving water resources.

[0008] Preferably, the spray pipe is provided with a second rotary joint, with a water inlet pipe connecting the reflux pump and the second rotary joint. The transmission member includes a driving gear and a driven gear, the driving gear being mounted on the drum, and the driven gear being mounted on the spray pipe. Using the transmission member to drive the circumferential rotation of the spray pipe allows the nozzle to spray in a wider direction and range, enabling comprehensive flushing of the membrane assembly and the inner wall of the reactor, further improving the reactor's wastewater treatment efficiency.

[0009] Preferably, the membrane separation zone further includes a secondary membrane separation mechanism, comprising a membrane frame, a plurality of second and third flat membranes disposed within the membrane frame, the second flat membranes being vertically and evenly spaced along the length of the membrane frame, and the third flat membranes being obliquely arranged between adjacent second flat membranes. The spray pipe is located between the primary and secondary membrane separation mechanisms. The vertically arranged second flat membranes enable faster passage of wastewater; the obliquely arranged third flat membranes provide a wider contact surface with upwardly flowing wastewater, accelerating wastewater treatment. Furthermore, the spray pipe also slows the flow rate of some wastewater, prolonging its contact time with the third flat membranes and further improving wastewater treatment efficiency.

[0010] Preferably, a three-phase separator is disposed below the primary membrane separation mechanism. Below the three-phase separator, an annular tube connected to an aeration pump is disposed. The annular tube is positioned flush against the inner wall of the reactor and has a plurality of upward-facing aeration holes. The annular tube aerates the wastewater near the inner wall of the reactor, accelerating its upward flow and reducing the adhesion of sludge to the inner wall of the reactor.

[0011] Preferably, an anaerobic activated sludge zone is provided at the bottom of the reactor, and a gas-liquid separator is provided at the top. An internal circulation pipe is inserted into the three-phase separator, the lower end of which extends to the lower end of the anaerobic activated sludge zone, and the upper end is connected to the gas-liquid separator. A gas lift pipe is connected between the three-phase separator and the gas-liquid separator. The anaerobic activated sludge zone is used to degrade organic matter in the sewage and produce biogas; the gas lift pipe is suitable for transporting the biogas separated in the three-phase separator and the mud-water mixture carried by the biogas to the gas-liquid separator, and the gas-liquid separator discharges the biogas from the biogas pipe. The internal circulation pipe is used to return the mud-water mixture in the gas-liquid separator to the bottom of the anaerobic activated sludge zone for further treatment.

[0012] Preferably, a groove is formed on the outer wall of the rotating drum, and semicircular grooves are provided at both ends of the groove bottom. Semicircular protrusions are provided at both ends of the membrane channel to engage with the semicircular grooves. The membrane channel adopts a detachable connection method of semicircular grooves and semicircular protrusions, which has a simpler structure.

[0013] The beneficial effects of the utility model are:

[0014] 1. When the reactor of the present invention is cleaned, clean water enters the reactor, and the driving part drives the rotating drum to drive the suspended ball filler and the first flat membrane to rotate synchronously and beat the clean water. The impact force generated by beating the water can wash away the film and blockages on the membrane assembly; at the same time, the bubbles generated by the aeration mechanism and the water sprayed from the nozzle can further increase the flushing force of the clean water on the blockage, making it difficult for suspended particles in the sewage to deposit on the membrane assembly, thereby accelerating the cleaning speed and ensuring the continuous sewage purification effect of the reactor.

[0015] 2. The vertically arranged second flat membrane in the secondary membrane separation mechanism enables some sewage to pass through faster, and the inclined third flat membrane slows down the flow rate of some sewage. The combination of fast and slow makes the secondary membrane separation mechanism less likely to be clogged. At the same time, when the inclined third flat membrane comes into contact with the upward-flowing sewage, the contact surface is wider, which accelerates the sewage treatment effect.

[0016] 3. In the utility model, the anaerobic activated sludge in the anaerobic activated sludge zone reacts with the organic matter in the sewage to remove the organic matter in the sewage and generate biogas, thereby achieving the purpose of purifying the sewage; the internal circulation pipe is used to return the mud-water mixture in the gas-liquid separator to the bottom of the anaerobic activated sludge zone, where it is fully mixed with the anaerobic sludge and the incoming sewage and then flows upward again to form an internal circulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of the present utility model.

[0018] Figure 2 Schematic diagram of the membrane channel structure.

[0019] Figure 3 Schematic diagram of the structure of the annular tube.

[0020] In the picture:

[0021] 1. Reactor; 11. Water outlet; 12. Water collecting tank; 121. Overflow port; 13. Gas-liquid separator; 14. Water inlet; 2. Primary membrane separation mechanism; 21. Driving element; 22. Rotating drum; 221. Groove; 222. Semicircular slot; 3. Membrane assembly; 31. Membrane channel; 311. Semicircular protrusion; 32. First flat membrane; 4. Aeration mechanism; 41. Aeration pump; 42. Aeration pipe; 43. Aerator; 44. Ring Pipe; 441, aeration hole; 45, first rotary joint; 5, secondary membrane separation mechanism; 51, membrane frame; 52, second flat membrane; 53, third flat membrane; 6, spray pipe; 61, nozzle; 62, second rotary joint; 63, reflux pump; 7, transmission part; 71, driving gear; 72, driven gear; 8, suspended ball filler; 9, three-phase separator; 10, anaerobic activated sludge zone; 101, internal circulation pipe; 102, air lift pipe. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings.

[0023] The embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example 1

[0024] like Figure 1 As shown, an internal circulation anaerobic membrane bioreactor domestic sewage treatment device includes a reactor 1, a gas-liquid separator 13 is provided on the outside of the top of the reactor 1, a water outlet 11 is provided at the upper end of the reactor 1, and a water inlet 14 is provided at the lower end. A water collecting tank 12 is provided at the water outlet 11, an overflow port 121 is provided on the water collecting tank 12, and a reflux pump 63 is provided in the water collecting tank 12. From top to bottom, a membrane separation zone, a three-phase separator 9 and an anaerobic activated sludge zone 10 are sequentially provided in the reactor 1. An internal circulation pipe 101 is inserted into the three-phase separator 9. The lower end of the internal circulation pipe 101 extends to the lower end of the anaerobic activated sludge zone 10, and the upper end is connected to the gas-liquid separator 13. An air extraction pipe 102 is connected between the three-phase separator 9 and the gas-liquid separator 13.

[0025] like Figure 1 As shown, the membrane separation zone includes a secondary membrane separation mechanism 5 and a primary membrane separation mechanism 2, which are arranged in sequence from top to bottom. The secondary membrane separation mechanism 5 includes a membrane frame 51, a plurality of second flat membranes 52 and a third flat membrane 53 arranged within the membrane frame 51. The second flat membranes 52 are arranged vertically and evenly spaced along the length of the membrane frame 51, and the third flat membranes 53 are arranged obliquely between adjacent second flat membranes 52.

[0026] like Figure 1 and Figure 2 As shown, the primary membrane separation mechanism 2 includes a driving member 21 and a transmission member 7 located outside the reactor, a hollow rotating drum 22, and a plurality of membrane assemblies 3. The driving member 21 is a motor. The rotating drum 22 is arranged horizontally, and one end of the rotating drum 22 is connected to the driving member 21 through the transmission member 7 after passing through the reactor. The membrane assembly 3 includes a plurality of hollow membrane channels 31 and a first flat membrane 32. The first flat membrane 32 is evenly spaced along the circumference of the rotating drum 22. The width of the first flat membrane 32 is small and does not interfere with the gas stripping pipe 102. The membrane channel 31 of the reactor 1 is located between adjacent first flat membranes 32. Semicircular protrusions 311 are provided at both ends of the membrane channel 31, and a groove 221 is provided on the outer wall of the rotating drum 22. The two ends of the bottom of the groove 221 are provided with semicircular grooves 222 that are engaged with the semicircular protrusions 311. Each membrane channel 31 is filled with a plurality of suspended ball fillers 8.

[0027] like Figure 1As shown, a spray pipe 6 is provided between the primary membrane separation mechanism 2 and the secondary membrane separation mechanism 5, and a plurality of nozzles 61 are provided on the spray pipe 6. A second rotary joint 62 is provided at one end of the spray pipe 6 after passing through the reactor, and a water inlet pipe is connected between the reflux pump 63 and the second rotary joint 62.

[0028] like Figure 1 As shown, the transmission member 7 includes a driving gear 71 and two driven gears 72 . The driving gear 71 is mounted on the rotating drum 22 , and the driven gears 72 are mounted on the spray pipe 6 .

[0029] like Figure 1 and Figure 3 As shown, an aeration mechanism 4 is provided outside the reactor, comprising an aeration pump 41, an aeration pipe 42, and several aerators 43. A first rotary joint 45 is provided at one end of the drum 22 extending out of the reactor. The aeration pump 41 and the first rotary joint 45 are connected via the aeration pipe 42, and the aerators 43 are connected to the drum 22. An annular pipe 44 is provided below the three-phase separator 9, communicating with the aeration pump 41. The annular pipe 44 is positioned against the inner wall of the reactor and has several upward-facing aeration holes 441.

[0030] In summary

[0031] During wastewater treatment in the reactor, wastewater enters from the water inlet 14. As it passes through the anaerobic activated sludge zone 10, the organic matter in the wastewater is degraded to produce biogas. The wastewater then enters the three-phase separator 9. Under the action of the three-phase separator 9, the gas entrained with the liquid is transported to the gas-liquid separator 13 through the air lift pipe 102. The gas is discharged, and the muddy water returns to the bottom of the anaerobic activated sludge zone 10 through the internal circulation pipe 101, where it mixes with the incoming wastewater and then flows upward, forming an internal circulation. After reacting in the anaerobic activated sludge zone 10, the wastewater continues to rise, passing through the primary membrane separation mechanism 2 and the secondary membrane separation mechanism 5 in sequence, effectively intercepting microorganisms and macromolecular organic matter in the wastewater. The treated water is then discharged from the water outlet 11 into the sump 12. During wastewater treatment, the aeration pump 41 aerates the reactor, which not only pushes the wastewater upward and disturbs it, but also provides sufficient dissolved oxygen.

[0032] When the primary membrane separation mechanism 2 and the secondary membrane separation mechanism 5 in the reactor 1 are cleaned, clean water enters from the water inlet 14, and the motor drives the drum 22 to rotate, driving the suspended ball filler 833 and the first flat membrane 32 to rotate synchronously and beat and break up the clean water. The impact force generated when beating the water washes away the film and blockages on the membrane assembly 3; the bubbles generated by the aeration mechanism 4 further increase the flushing force of the clean water on the blockage, making it difficult for suspended particles in the sewage to deposit on the membrane assembly 3, speeding up the cleaning speed and ensuring the continuous sewage purification effect of the reactor; at the same time, the reflux pump 63 works, and the clean water in the sump 12 is flushed to the primary membrane separation mechanism 2 and the secondary membrane separation mechanism 5 through the spray pipe 6 and the nozzle 61, further speeding up the cleaning speed.

[0033] The embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Claims

1. An internal circulation anaerobic membrane bioreactor domestic sewage treatment device, comprising a reactor, characterized in that: A membrane separation zone is provided in the reactor, and the membrane separation zone includes a primary membrane separation mechanism; The primary membrane separation mechanism includes a driving member, a transmission member, a rotating drum, and a plurality of membrane assemblies. The driving member and the transmission member are located outside the reactor. The rotating drum is hollow inside and arranged horizontally inside the reactor. One end of the rotating drum passes through the reactor and is rotatably connected to the driving member through the transmission member. The membrane assembly includes a plurality of membrane channels and first flat membranes, wherein the first flat membranes are evenly spaced along the circumference of the drum, the membrane channels are detachably connected to the drum, the membrane channels are hollow and located between adjacent first flat membranes, and each membrane channel is filled with a plurality of suspended ball fillers; An aeration mechanism is provided outside the reactor, comprising an aeration pump, an aeration pipe and several aerators. A first rotary joint is provided at one end of the drum passing through the reactor. The aeration pump and the first rotary joint are connected through the aeration pipe, and the aerator is connected to the drum.

2. The internal circulation anaerobic membrane bioreactor domestic sewage treatment device according to claim 1, characterized in that: A water outlet is provided at the upper end of the reactor, a water collecting tank is provided at the water outlet, an overflow port is provided on the water collecting tank, a reflux pump is provided in the water collecting tank, a spray pipe is provided horizontally above the primary membrane separation mechanism, a plurality of nozzles are provided on the spray pipe, and one end of the spray pipe passes through the reactor and is connected to the reflux pump.

3. The internal circulation anaerobic membrane bioreactor domestic sewage treatment device according to claim 2, characterized in that: The spray pipe is provided with a second rotary joint, and a water inlet pipe is connected between the reflux pump and the second rotary joint; The transmission member comprises a driving gear and a driven gear, wherein the driving gear is mounted on the rotating drum and the driven gear is mounted on the spray pipe.

4. The internal circulation anaerobic membrane bioreactor domestic sewage treatment device according to claim 3, characterized in that: The membrane separation area also includes a secondary membrane separation mechanism, which includes a membrane frame, a plurality of second flat membranes and a third flat membrane arranged in the membrane frame, the second flat membranes are arranged vertically and evenly along the length direction of the membrane frame, and the third flat membranes are arranged obliquely between adjacent second flat membranes. The spray pipe is located between the primary membrane separation mechanism and the secondary membrane separation mechanism.

5. The internal circulation anaerobic membrane bioreactor domestic sewage treatment device according to claim 1, characterized in that: A three-phase separator is provided below the primary membrane separation mechanism. An annular tube connected to an aeration pump is provided below the three-phase separator. The annular tube is arranged close to the inner wall of the reactor and has a plurality of upward aeration holes.

6. The internal circulation anaerobic membrane bioreactor domestic sewage treatment device according to claim 5, characterized in that: An anaerobic activated sludge zone is provided in the bottom of the reactor, and a gas-liquid separator is provided outside the top. An internal circulation pipe is inserted into the three-phase separator. The lower end of the internal circulation pipe extends to the lower end of the anaerobic activated sludge zone, and the upper end is connected to the gas-liquid separator. An air lift pipe is connected between the three-phase separator and the gas-liquid separator.

7. The internal circulation anaerobic membrane bioreactor domestic sewage treatment device according to claim 1, characterized in that: A groove is provided on the outer side wall of the rotating drum, and semicircular clamping grooves are provided at both ends of the groove bottom. Semicircular protrusions that are clamped with the semicircular clamping grooves are provided at both ends of the membrane channel.

Images