CN214990979U

CN214990979U - Landfill leachate treatment system

Info

Publication number: CN214990979U
Application number: CN202120744177.8U
Authority: CN
Inventors: 许坚立; 王中洲; 谢绍雄; 佘征平; 陆家勋; 李坤; 王丽琼; 邹祝琪
Original assignee: Shenzhen Lanqing Environmental Technology Engineering Co ltd
Current assignee: Shenzhen Lanqing Environmental Technology Engineering Co ltd
Priority date: 2021-04-12
Filing date: 2021-04-12
Publication date: 2021-12-03
Anticipated expiration: 2031-04-12

Abstract

The application relates to the field of advanced treatment of household garbage leachate, in particular to a garbage leachate treatment system which comprises a waste liquid regulating tank, wherein the garbage leachate flows into the waste liquid regulating tank, one side of the waste liquid regulating tank is provided with a front-end treatment device, a lifting pump is arranged in the waste liquid regulating tank, the garbage leachate is conveyed into the front-end treatment device by the lifting pump, the front-end treatment device is connected with a rear-end treatment device, and the rear-end treatment device is connected with an ultrasonic flowmeter; the rear end processing device comprises a first-stage Fenton reaction mechanism, a first-stage decomposition mechanism, a second-stage Fenton reaction mechanism, a second-stage decomposition mechanism and a third-stage Fenton reaction mechanism which are sequentially arranged. The application has the effect of further treating the membrane-back concentrated water and reducing the content of COD, ammonia nitrogen and other controllable pollutants in the concentrated water.

Description

Landfill leachate treatment system

Technical Field

The application relates to the field of domestic waste leachate advanced treatment, in particular to a landfill leachate treatment system.

Background

The landfill leachate is high-concentration organic wastewater which is formed by deducting the saturated water holding capacity of garbage and a soil covering layer from water contained in the garbage in a garbage landfill, rain, snow and water entering the landfill and other water and passing through the garbage layer and the soil covering layer. There is also water that accumulates to leak out of the waste ready for incineration.

Two or more processes can be used jointly when leachate is treated in a general landfill, and the adopted processes are different according to the type of landfill garbage in the landfill and the effluent quality of the leachate. A common centralized leachate treatment process for a landfill in China comprises the following common treatment methods: the contents of COD, BOD, ammonia nitrogen, total nitrogen and the like in the treated percolate are reduced.

Environmental protection standards are becoming stricter, and the effluent quality is sometimes difficult to be guaranteed to reach the standard by using the conventional landfill leachate treatment technology. In recent years, membrane treatment processes typified by reverse osmosis membrane processes are increasingly used in landfill leachate treatment projects. The reverse osmosis membrane method is a process in which an external pressure higher than the osmotic pressure of a solution is applied to the raw water side of a semipermeable membrane, and when raw water permeates through the semipermeable membrane, only water is allowed to permeate, and other substances cannot permeate and are trapped on the surface of the membrane. The reverse osmosis membrane is an artificial semipermeable membrane with certain characteristics and is made by simulating a biological semipermeable membrane, and is a core component of a reverse osmosis technology. The principle of reverse osmosis is that under the action of the osmotic pressure higher than that of the solution, other substances are separated from water based on the fact that the substances cannot permeate a semipermeable membrane. The reverse osmosis membrane has a very small membrane pore size, and thus can effectively remove dissolved salts, colloids, microorganisms, organic substances, and the like in water.

In view of the above-mentioned related technologies, the inventors believe that sewage treatment by a reverse osmosis membrane method results in a high content of pollutants such as COD and ammonia nitrogen in the sewage, and a concentrated water after membrane formation.

SUMMERY OF THE UTILITY MODEL

In order to further handle behind the membrane dense water, reduce the content of steerable pollutants such as COD, ammonia nitrogen in the dense water, this application provides a landfill leachate processing system.

The application provides a landfill leachate processing system adopts following technical scheme:

a landfill leachate treatment system comprises a waste liquid adjusting tank, landfill leachate flows into the waste liquid adjusting tank, a front-end treatment device is arranged on one side of the waste liquid adjusting tank, a lifting pump is arranged in the waste liquid adjusting tank and sends the landfill leachate into the front-end treatment device, the front-end treatment device is connected with a rear-end treatment device, and the rear-end treatment device is connected with an ultrasonic flowmeter; the rear end processing device comprises a first-stage Fenton reaction mechanism, a first-stage decomposition mechanism, a second-stage Fenton reaction mechanism, a second-stage decomposition mechanism and a third-stage Fenton reaction mechanism which are sequentially arranged.

Through adopting above-mentioned technical scheme, landfill leachate discharges into the waste liquid equalizing basin, the elevator pump sends landfill leachate extraction into front end processing apparatus department, carry out earlier stage treatment with landfill leachate through front end processing apparatus, the filtration liquid after earlier stage treatment passes through one-level fenton reaction mechanism in proper order, one-level decomposition mechanism, second grade fenton reaction mechanism, second grade decomposition mechanism and tertiary fenton reaction mechanism, filtration liquid is through fenton reaction and decomposition reaction many times, purify the interior exhaust dense water of front end processing apparatus, COD in the dense water has been reduced, the content of steerable pollutants such as ammonia nitrogen, reduce the pollution of dense water to the environment.

Optionally, one-level decomposition mechanism includes oxygen deficiency pond, good oxygen pond and well heavy pond, the oxygen deficiency pond good oxygen pond with the pool wall butt and the intercommunication in heavy pond, be provided with the oxygen deficiency spare in the oxygen deficiency pond, be provided with the piece of adding oxygen in the good oxygen pond, well heavy pond lower extreme is connected with the sludge impoundment, second grade decomposition mechanism with one-level decomposition mechanism's equipment is unanimous.

Through adopting above-mentioned technical scheme, landfill leachate flows into in the oxygen deficiency pond, denitrification through the oxygen deficiency spare gets rid of nitrate nitrogen, get rid of partial BOD simultaneously, percolate flows into in the good oxygen pond from the oxygen deficiency pond, the oxygen device inputs oxygen in to liquid, make more oxygen of dissolving in the liquid, make the good oxygen microorganism in the sewage under the condition that has free oxygen to exist, digest, degrade the organic matter in the sewage, flow into in the heavy pond through the percolate after the decomposition and deposit, mud after the sediment gets into in the mud pond, reduce the controllable pollutant content in the percolate.

Optionally, a flow guide wall is fixedly connected in the anoxic tank.

By adopting the technical scheme, the dead angle of a flow field in the water tank is reduced by arranging the flow guide wall in the anoxic tank, so that the liquid flow in the anoxic tank is accelerated, and the purification speed is further improved.

Optionally, the oxygen deficiency piece includes a gas transmission pipe network and a first air blower, the air blower is fixedly connected to the cover plate of the oxygen deficiency pool, a fixing piece is arranged on the gas transmission pipe network, the fixing piece fixes the gas transmission pipe network at the bottom of the pool, a plurality of first aeration holes are formed in the gas transmission pipe network, one end of the gas transmission pipe network is connected and communicated with a vertical first main pipe, the first air blower is connected with a first air pipe, and the first air pipe is connected with the first main pipe.

Through adopting above-mentioned technical scheme, start first air-blower and flow in compressed air to first tuber pipe, compressed air is transmitted to the gas transmission pipe network in entering the main pipe, flow everywhere to the bottom of the pool along with the gas transmission pipe network, spill in the aeration hole from first, stir the liquid in the oxygen deficiency pond, the liquid flow in oxygen deficiency pond with higher speed, prevent sludge sedimentation, make sewage and mud intensive mixing, ensure that sewage is handled, and let in compressed air and stir, make whole waste liquid treatment more environmental protection, reduce all the other pollutants and get into in the oxygen deficiency pond.

Optionally, the mounting includes backup pad and base, the joint has the fastening area in the backup pad, backup pad lower extreme fixedly connected with connecting rod, the connecting rod is kept away from the spread groove has been seted up to the one end of backup pad, fixed surface is connected with vertical straight-bar on the base, straight-bar threaded connection be in the spread groove, fixed surface is connected with a plurality of sucking discs under the base, the sucking disc adsorbs on the pool wall.

Through adopting above-mentioned technical scheme, use the pipeline of backup pad in with the gas transmission pipe network to hold up, with fastening area joint in the spread groove, make the pipeline restricted in the backup pad, insert the straight-bar screw thread in the spread groove, the straight-bar is fixed with the connecting rod, the sucking disc adsorbs on the bottom pool wall, consolidate the base and be connected of pool wall, through a plurality of sucking discs, a pedestal, straight-bar and connecting rod support the gas transmission pipe network, make the fixed of gas transmission pipe network more stable, the straight-bar is dismantled conveniently in the connecting rod, the workman's on-the-spot installation of being convenient for.

Optionally, the oxygenation piece includes second air-blower and aeration pipe network, the aeration pipe network passes through the mounting and connects the bottom of the pool in good oxygen pond, a plurality of second aeration holes have been seted up on the aeration pipe network, the second aeration pipe in second aeration hole fixedly connected with aeration dish, one side of aeration pipe network is connected and is communicated with the second and be responsible for, be connected with the second tuber pipe on the second air-blower, the second tuber pipe stretches into connect in good oxygen pond the second is responsible for.

By adopting the technical scheme, the second air blower is started, the second air blower sends compressed air into the second main pipe from the second air pipe, the compressed air flows into the aeration pipe network from the second main pipe and flows into the aeration disc from the second aeration hole, the aeration disc dispersedly flows out the air to drive the liquid to flow, so that the content of dissolved oxygen in the liquid is controlled to a certain degree, the aerobic microorganisms are helped to grow and reproduce, structures of pollutants in water are treated, the microorganisms can perform aerobic respiration to the maximum benefit, and the organic matters are further decomposed into inorganic matters.

Optionally, a mud pump is fixed on a cover plate of the intermediate sedimentation tank, the mud pump is connected with a mud pumping pipe, the other end of the mud pumping pump is connected with a mud outlet pipe, the mud pumping pipe extends into the intermediate sedimentation tank, and the mud outlet pipe extends into the aerobic tank.

Through adopting above-mentioned technical scheme, start the mud pump, the mud pump draws the silt in the mud pit and lets in the good oxygen pond, and the mud that makes is carried out oxidation treatment once more, makes the organic matter in the better decomposition mud of microorganism in the mud, reduces the content of the steerable pollutant in the mud.

Optionally, a combined filler is connected in the anoxic tank and the aerobic tank.

By adopting the technical scheme, the combined filler can be used for hanging the membrane and effectively cutting bubbles, so that the transfer rate and the utilization rate of oxygen are improved, the water-gas biomembrane is fully exchanged, and organic matters in water are efficiently treated.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the landfill leachate is discharged into a waste liquid adjusting tank, the landfill leachate is pumped and sent to a front-end processing device by a lifting pump, the landfill leachate is subjected to pre-treatment by the front-end processing device, the leachate subjected to the pre-treatment sequentially passes through a primary Fenton reaction mechanism, a primary decomposition mechanism, a secondary Fenton reaction mechanism, a secondary decomposition mechanism and a tertiary Fenton reaction mechanism, and the leachate is subjected to multiple Fenton reactions and decomposition reactions to purify concentrated water discharged from the front-end processing device, so that the content of controllable pollutants such as COD (chemical oxygen demand), ammonia nitrogen and the like in the concentrated water is reduced, and the pollution of the concentrated water to the environment is reduced;

2. the flow guide wall is arranged in the anoxic tank, so that dead corners of a flow field in the tank are reduced, the liquid flow in the anoxic tank is accelerated, and the purification speed is further improved;

3. and a sludge pump is arranged on the intermediate sedimentation tank, the sludge pump is started, the sludge in the sludge tank is pumped by the sludge pump and introduced into the aerobic tank, so that the sludge is oxidized again, the microorganisms in the sludge can better decompose organic matters in the sludge, and the content of controllable pollutants in the sludge is reduced.

Drawings

Fig. 1 is a schematic diagram of the overall structure of a landfill leachate treatment system according to the present application.

Fig. 2 is a partial cross-sectional view of fig. 1 at the first stage of the disassembly mechanism.

Fig. 3 is a partial structural view at a in fig. 2.

Fig. 4 is an exploded view of a portion of the fastener of fig. 3.

Description of reference numerals: 1. a waste liquid adjusting tank; 2. a front-end processing device; 3. a lift pump; 4. a back-end processing device; 41. a first-stage Fenton reaction mechanism; 42. a first-stage decomposition mechanism; 43. a second-stage Fenton reaction mechanism; 44. a secondary decomposition mechanism; 45. a three-stage Fenton reaction mechanism; 5. an anoxic tank; 51. a guide wall; 6. an aerobic tank; 7. a middle sedimentation tank; 71. filling the inclined tube; 72. a draft tube; 73. a discharge hopper; 8. an anoxic member; 81. a gas transmission pipe network; 811. a first aeration hole; 82. a first blower; 83. a first air duct; 84. a first main tube; 9. an oxygenation piece; 91. a second blower; 92. an aeration pipe network; 93. a second aeration hole; 94. an aeration disc; 95. a second main pipe; 96. a second air duct; 10. a fixing member; 101. a support plate; 102. a base; 103. a connecting rod; 104. a straight rod; 105. a suction cup; 106. connecting grooves; 107. a fastening tape; 11. a mud pump; 12. a mud pumping pipe; 13. a mud outlet pipe; 14. and (4) combining the fillers.

Detailed Description

The present application is described in further detail below with reference to figures 1-4.

The embodiment of the application discloses a landfill leachate treatment system, refer to fig. 1, including the waste liquid equalizing basin 1, set up the elevator pump 3 in the waste liquid equalizing basin 1, one side of the elevator pump 3 connects with the front end processing unit 2, the elevator pump 3 sends the waste liquid into the front end processing unit 2 from the waste liquid equalizing basin 1, one side of the front end processing unit 2 is provided with the back end processing unit 4;

the rear-end processing apparatus 4 includes the one-level fenton reaction mechanism 41, the one-level decomposition mechanism 42, the second-level fenton reaction mechanism 43, the second-level decomposition mechanism 44 and the third-level fenton reaction mechanism 45 that set gradually, and the waste water flows out after being processed through a plurality of mechanisms in sequence.

Referring to fig. 1 and 2, the first-stage decomposition mechanism 42 and the second-stage decomposition mechanism 44 have the same internal structure and respectively comprise an anoxic tank 5, an aerobic tank 6 and a middle sedimentation tank 7, the lower part of each tank body is lower than the ground floor, and combined fillers 14 are arranged in the anoxic tank 5 and the aerobic tank 6; the combined filler 14 is another type of filler improved on the basis of soft filler and consists of fiber bundles, plastic ring sheets, sleeves and a central rope, wherein a net rack is arranged at the position of the tank body close to the cover plate, and the central rope is hung on the net rack; the walls of the anoxic tank 5 and the aerobic tank 6 are mutually abutted, and the walls of the tanks are provided with flow holes; the tank wall of one side of the aerobic tank 6, which is far away from the anoxic tank 5, is abutted against and connected with the tank wall of the intermediate sedimentation tank 7 and is communicated with a guide pipe; an anoxic part 8 is arranged in the anoxic tank 5, a flow guide wall 51 is arranged on one side of the anoxic tank 5, which is far away from the aerobic tank 6, and the flow guide wall 51 is poured in the anoxic tank 5 without contacting the tank bottom to promote the liquid to flow; an oxygen adding part 9 is arranged in the aerobic tank 6, and the lower end of the intermediate sedimentation tank 7 is communicated with a sludge tank.

Referring to fig. 2, an inclined tube filler 71 is arranged in the intermediate sedimentation tank 7, a guide cylinder 72 is fixed in the middle of the inclined tube filler 71, a discharge hopper 73 is arranged at the lower end of the guide cylinder 72, and the discharge hopper 73 is arranged below the ground and communicated with an external sludge tank; be provided with dredge pump 11 on the apron of well heavy pond 7, dredge pump 11's base 102 passes through bolted connection on the apron, and the mud pumping mouth department of dredge pump 11 has a mud pumping pipe 12 through the articulate, and mud pumping pipe 12 stretches into the sludge impoundment from well heavy pond 7, and the mud outlet of dredge pump 11 has a mud outlet pipe 13 through the articulate, and mud outlet pipe 13 stretches out into good oxygen pond 6 from the apron in, discharges into good oxygen pond 6 with some mud.

Referring to fig. 1 and 2, the anoxic member 8 includes a gas transmission pipe network 81, a first main pipe 84 and a first blower 82, the gas transmission pipe network 81 is a square pipeline formed by connecting and communicating a plurality of PVC pipes, a fixing member 10 is arranged on the gas transmission pipe network 81 to fix the gas transmission pipe network 81 at the bottom of the tank, one side of the gas transmission pipe network 81 close to the tank wall is integrally connected with the vertically arranged first main pipe 84, the upper end of the first main pipe 84 is connected with a vertically arranged first air pipe 83 through a pipe sleeve, the first air pipe 83 extends out of the tank and is connected with the first blower 82, and a base 102 of the first blower 82 is connected to a cover plate of the anoxic tank 5 through bolts; a plurality of first aeration holes 811 which are uniformly distributed are formed in the gas transmission pipe network 81, the first air blower 82 adopts an air compressor to convey gas into the gas transmission pipe network 81 from the first air pipe 83 and the first main pipe 84, and the gas flows out of the first aeration holes 811 to stir liquid, so that the liquid flow is promoted to react.

Referring to fig. 1 and 2, the oxygenation part 9 includes a second blower 91, the second is responsible for 95, a second air pipe 96 and an aeration pipe network 92, the aeration pipe network 92 is fixed at the bottom of the aerobic tank 6 through a fixing part 10, a second aeration hole 93 has been seted up on the aeration pipe network 92, the aeration pipe network 92 is connected with a second aeration hole 93 department hot melt and is communicated with an aeration disc 94, the second is responsible for 95 hot melt and is connected and communicate on the side that the aeration pipe network 92 is close to the tank wall, the second is responsible for 95 and is vertically connected with the second air pipe 96 through the pipe sleeve, the second air pipe 96 wears out the gas outlet that the tank body is connected with the second blower 91, a base 102 of the second blower 91 is connected on the cover plate of the aerobic tank 6 through a bolt, and the second blower 91 selects an air compressor.

Referring to fig. 3 and 4, the fixing member 10 includes a supporting plate 101 and a base 102, the supporting plate 101 is an arc ABS material plate, clamping grooves are formed at both ends of the supporting plate 101 in the length direction, clamping holes are formed in the inner walls of the clamping grooves, fastening bands 107 are clamped in the clamping grooves, and convex spheres at both sides of the fastening bands 107 are clamped in the clamping holes; a vertical connecting rod 103 is bonded on one convex side of the supporting plate 101, a connecting groove 106 is formed in the lower end of the connecting rod 103, and an internal thread is arranged on the inner wall of the connecting groove 106; the base 102 is in a round table shape, a vertical straight rod 104 is bonded on the upper surface of the base 102, an external thread is arranged on the straight rod 104, and the straight rod 104 is in threaded connection with the connecting groove 106; the base 102 is fixed at the bottom of the pool through bolts, the lower surface of the base 102 is connected with a plurality of suckers 105, and the suckers 105 are made of rubber materials, so that the base 102 is more stably adsorbed on the wall of the pool.

The implementation principle of a landfill leachate treatment system of the embodiment of the application is as follows: the waste water flows into the waste liquid adjusting tank 1, flows into the front end processing device 2 from the waste liquid adjusting tank 1 through the lifting pump 3, flows into the primary Fenton reaction mechanism 41 after being subjected to primary oxidation treatment and membrane treatment in the front-end treatment device 2, flows into the anoxic tank 5 after being subjected to single Fenton reaction treatment, after being decomposed by anaerobic organisms in the anoxic tank 5, harmful substances flow into the aerobic tank 6, the gas is sent into an aeration pipe network 92 from a second air pipe 96 and a second main pipe 95 through a second blower 91, the aeration is performed by the aeration disk 94, the waste liquid is oxidized and then flows into the sedimentation tank 7 for sedimentation, the waste liquid which is not sedimentated is discharged into the secondary Fenton reaction mechanism 43 for secondary Fenton reaction, the waste liquid which is not sedimentated is discharged into the secondary Fenton reaction mechanism 42 after secondary reaction and then flows into the tertiary Fenton reaction mechanism after the decomposition operation in the secondary decomposition mechanism is repeated, and the waste liquid which is subjected to multilayer reaction is finally discharged.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a landfill leachate processing system which characterized in that: the garbage leachate treatment system comprises a waste liquid adjusting tank (1), wherein garbage leachate flows into the waste liquid adjusting tank (1), a front-end processing device (2) is arranged on one side of the waste liquid adjusting tank (1), a lifting pump (3) is arranged in the waste liquid adjusting tank (1), the garbage leachate is conveyed into the front-end processing device (2) by the lifting pump (3), the front-end processing device (2) is connected with a rear-end processing device (4), and the rear-end processing device (4) is connected with an ultrasonic flowmeter; the rear-end processing device (4) comprises a first-stage Fenton reaction mechanism (41), a first-stage decomposition mechanism (42), a second-stage Fenton reaction mechanism (43), a second-stage decomposition mechanism (44) and a third-stage Fenton reaction mechanism (45) which are sequentially arranged.

2. The landfill leachate treatment system of claim 1, wherein: one-level decomposition mechanism (42) include oxygen deficiency pond (5), good oxygen pond (6) and well heavy pond (7), oxygen deficiency pond (5) good oxygen pond (6) with the pool wall butt and the intercommunication of well heavy pond (7), be provided with oxygen deficiency spare (8) in oxygen deficiency pond (5), be provided with in good oxygen pond (6) and add oxygen spare (9), well heavy pond (7) lower extreme is connected with the sludge impoundment, second grade decomposition mechanism (44) with the equipment of one-level decomposition mechanism (42) is unanimous.

3. The landfill leachate treatment system of claim 2, wherein: and a guide wall (51) is fixedly connected in the anoxic tank (5).

4. The landfill leachate treatment system of claim 2, wherein: oxygen deficiency spare (8) are including gas transmission pipe network (81) and first air-blower (82) fixed connection in on the apron of oxygen deficiency pond (5), be provided with mounting (10) on gas transmission pipe network (81), mounting (10) will gas transmission pipe network (81) are fixed at the bottom of the pool, a plurality of first aeration holes (811) have been seted up on gas transmission pipe network (81), the one end of gas transmission pipe network (81) is connected and is communicated and have vertical first person in charge (84), first air-blower (82) are connected with first tuber pipe (83), first tuber pipe (83) are connected first person in charge (84).

5. The landfill leachate treatment system of claim 4, wherein: mounting (10) are including backup pad (101) and base (102), the joint has fastening area (107) on backup pad (101), backup pad (101) lower extreme fixedly connected with connecting rod (103), connecting rod (103) are kept away from spread groove (106) have been seted up to the one end of backup pad (101), fixed surface is connected with vertical straight-bar (104) on base (102), straight-bar (104) threaded connection be in spread groove (106), fixed surface is connected with a plurality of sucking discs (105) under base (102), sucking disc (105) adsorb on the pool wall.

6. The landfill leachate treatment system of claim 5, wherein: the oxygenation piece (9) comprises a second air blower (91) and an aeration pipe network (92), the aeration pipe network (92) is connected to the bottom of the aerobic tank (6) through a fixing piece (10), a plurality of second aeration holes (93) are formed in the aeration pipe network (92), the second aeration pipe is fixedly connected with an aeration disc (94) at the second aeration holes (93), one side of the aeration pipe network (92) is connected and communicated with a second main pipe (95), a second air pipe (96) is connected to the second air blower (91), and the second air pipe (96) stretches into the aerobic tank (6) and is connected with the second main pipe (95).

7. The landfill leachate treatment system of claim 6, wherein: a mud pump (11) is fixed on a cover plate of the intermediate sedimentation tank (7), the mud pump (11) is connected with a mud pumping pipe (12), the other end of the mud pumping pump (11) is connected with a mud outlet pipe (13), the mud pumping pipe (12) extends into the intermediate sedimentation tank (7), and the mud outlet pipe (13) extends into the aerobic tank (6).

8. The landfill leachate treatment system of claim 7, wherein: and a combined filler (14) is connected in the anoxic tank (5) and the aerobic tank (6).