CN218454088U - Garbage leachate treatment reaction tower for small compression station - Google Patents

Abstract

The utility model discloses a small-size compression station landfill leachate handles reaction tower, include: the height-diameter ratio is 2-4 and the external diameter is not more than 3m, a transverse partition for dividing the inner cavity of the reaction tower into an aerobic area and an anaerobic area which are sequentially arranged and communicated up and down is arranged in the reaction tower, a water collecting device is arranged at the upper end of the reaction tower, and the reaction tower is also connected with a mud-water circulation loop, an aeration and oxygenation loop and a membrane separation loop. The mud-water circulation loop is respectively communicated with the water collecting device and the anaerobic zone and is used for enabling sewage and sludge to circularly flow up and down in the reaction tower. The aeration and oxygenation loop is communicated with the aerobic zone. The membrane separation loop is respectively communicated with the water collecting device and the anaerobic zone to carry out membrane separation on the reacted mud and water, the separated sludge is enabled to flow back to the reaction tower again, and the separated clear water is discharged outwards. The utility model provides a device and method suitable for small-scale compression station filtration liquid is handled has activated sludge concentration height, land area is little, energy consumption low grade advantage.

Description

Garbage leachate treatment reaction tower for small compression station

Technical Field

The utility model relates to an environmental protection technology field especially relates to a small-size compression station landfill leachate handles reaction tower.

Background

MBR, also called Membrane bioreactor (Membrane Bio-Reactor), is a high-efficiency sewage treatment technology combining an activated sludge process and a Membrane separation technology. The technology utilizes membrane separation equipment to replace a secondary sedimentation tank, and realizes the function of separating the activated sludge and macromolecular organic substances in the activated sludge biochemical reactor from water. Because the activated sludge is completely trapped in the biochemical reactor, the biochemical reactor can maintain higher activated sludge (microorganism) concentration, and the separation of Hydraulic Retention Time (HRT) and Sludge Retention Time (SRT) is realized. Has the advantages of high overall pollutant removal rate, impact load resistance, good effluent quality and the like.

An activated sludge biochemical reactor in the MBR process can adopt various sewage treatment process forms, and the existing process mainly aims at high-concentration ammonia nitrogen and adopts an AO process. The degradation and removal of organic pollutants in the sewage are realized by activated sludge microorganisms trapped in the biochemical reactor. Generally, the higher the concentration of activated sludge in the reactor, the smaller the reactor volume required. Compared with the traditional water treatment process with the sludge concentration of 4-9 g/L, the activated sludge concentration in the MBR can reach 10-20 g/L, the volume of the reactor is greatly reduced, and the occupied area of equipment is saved.

The membrane separation equipment in the MBR process can be divided into external ultrafiltration and internal ultrafiltration according to the structural form. The built-in ultrafiltration has low energy consumption, larger equipment volume and slightly low tolerance to the concentration of pollutants and activated sludge; the external ultrafiltration has higher energy consumption, smaller equipment volume and higher tolerance concentration to pollutants and activated sludge.

Because the MBR maintains higher active sludge concentration, higher dissolved oxygen and stirring effect are required to be provided for the unit volume of the pool to ensure the normal growth of microorganisms, and the normal growth of the microorganisms is generally realized by improving aeration quantity and oxygenation mass transfer effect. The aeration quantity is controlled by the air quantity and the air pressure (slightly larger than the water depth pressure) of an aeration fan, and the oxygen and mass transfer effects are related to the structural form and the water depth of the aerator. The larger the water depth is, the higher the oxygen charging and mass transfer effect of the aerator is, the higher the wind pressure required by the corresponding fan is, the smaller the wind quantity is, the positive correlation between the energy consumption of the aeration fan and the wind pressure and wind quantity is, and the influence of the wind pressure on the energy consumption is larger under the condition of small wind quantity.

The conventional MBR process generally comprises two specific implementation forms of low-activity sludge concentration matched with an internal ultrafiltration membrane and a disc aerator and high-activity sludge concentration matched with an external ultrafiltration membrane and a jet aerator, wherein the two specific implementation forms are mainly economical in investment and operation and are mainly intensive, the occupied area and the operation and maintenance reliability are saved, and the specific design is combined with the project condition to consider which form is adopted.

In a percolate treatment project of a small-scale compression station, the energy consumption of an aeration fan generally occupies about 30-40% of the energy consumption of the whole percolate treatment project, so that the air pressure requirement on the aeration fan is reduced by generally adopting a low water depth design, but the oxygen-filling mass transfer efficiency is reduced; meanwhile, the energy efficiency ratio of the jet aerator with high oxygenation mass transfer effect is obviously reduced under the low water depth condition, and if the aerator with low oxygenation mass transfer efficiency is adopted, the air quantity of the aeration fan is greatly increased on the whole, so that the energy saving effect is not obvious. Finally, the conventional low water depth aerator has poor hydraulic stirring effect on high-concentration activated sludge, sludge deposition is easy to form, the effective volume of a biochemical reactor is reduced, the treatment performance is attenuated, an additional stirrer is needed, the energy consumption cost is increased, and otherwise, the concentration of the activated sludge kept during operation needs to be reduced.

The contradiction between the sludge concentration and the energy consumption causes that the operation working condition of high-concentration activated sludge is less kept in the design of a small-scale compression station leachate treatment project, so that better operation economic benefit can be obtained; however, from the compression station perspective, the low activated sludge concentration means that more reactor volume and floor space are required, which is contrary to the fact that conditions for small scale compression stations are extremely tight, which is a disadvantage and difficulty in the small scale compression station leachate treatment of current MBR process equipment.

SUMMERY OF THE UTILITY MODEL

The utility model provides a small-size compression station landfill leachate handles reaction tower to solve the technical problem of contradiction between the sludge concentration that exists in the current small-scale compression station leachate treatment project design and the energy consumption.

The utility model adopts the technical scheme as follows:

a small-size compression station landfill leachate handles reaction tower includes: the height-diameter ratio is 2-4 and the outer diameter is not more than 3m, a transverse partition for dividing the inner cavity of the reaction tower into an aerobic area and an anaerobic area which are sequentially arranged and communicated up and down is arranged in the reaction tower, a water collecting device for overflowing muddy water outwards is arranged at the upper end of the reaction tower, and the reaction tower is also connected with a muddy water circulating loop, an aeration and oxygenation loop and a membrane separation loop; the mud-water circulation loop is respectively communicated with the water collecting device and the anaerobic zone and is used for enabling sewage and sludge to circularly flow up and down in the reaction tower; the aeration oxygenation loop is communicated with the aerobic zone and is used for aerating and oxygenating the aerobic zone; the membrane separation loop is respectively communicated with the water collecting device and the anaerobic zone to carry out membrane separation on the reacted mud and water, the separated sludge is enabled to flow back to the reaction tower again, and the separated clear water is discharged outwards.

Further, the reaction tower comprises a reaction tower body which is arranged in a high-thin type, and a guide cylinder for guiding the flow of the muddy water; the reaction tower body is vertically arranged and is in a hollow cylinder shape with a closed bottom end, the transverse partition is horizontally arranged and is positioned at the lower end of the reaction tower body, and a water inlet for sewage to be treated to enter the anaerobic zone is formed in the side wall of the lower end of the reaction tower body; the guide shell is a hollow cylinder with two communicated ends and is arranged in the aerobic zone in an extending way along the height direction of the reaction tower body.

Further, the water collecting device comprises a water collecting tank for uniformly collecting water along the circumferential direction and a defoaming tank for defoaming the collected muddy water; the water collecting tank is connected to the inner peripheral wall of the upper end of the reaction tower body along the circumferential direction of the reaction tower body; the defoaming case is connected on the periphery wall of reaction tower body upper end, and communicates with the water catch bowl.

Further, the muddy water circulating loop comprises a circulating pipe for conveying the muddy water to circulate, a circulating pump for driving the muddy water to circularly flow, and a circulating pipe group for flushing the circulated muddy water into the stirring anaerobic zone; the circulating pipe group is annularly arranged in the anaerobic zone; two ends of the circulating pipe are respectively communicated with the water collecting device and the circulating pipe group; the circulating pump is connected to the pipeline of the circulating pipe.

Furthermore, the circulating pipe group comprises a circulating main pipe which is annular and is horizontally arranged in the anaerobic zone, and a plurality of jet branch pipes which are used for flushing muddy water into the anaerobic zone for stirring; the plurality of jet branch pipes are sequentially arranged at intervals along the circumferential direction of the circulation main pipe, the upper end of each jet branch pipe is communicated with the circulation main pipe, and the opposite lower ends of the jet branch pipes extend downwards towards the center of the circulation main pipe in an inclined mode.

Further, the aeration oxygenation loop comprises an aerator, an air pipe for conveying air and an aeration fan for introducing air to form aeration; the aerator is supported on the transverse partition and is positioned below the guide cylinder; the aeration fan is positioned outside the reaction tower body, one end of the air pipe is communicated with the aeration fan, and the other opposite end of the air pipe extends into the reaction tower body from the top of the reaction tower body and is connected with the aerator after downwards penetrating through the guide cylinder.

Further, the aerator is a plug flow aerator.

Furthermore, the membrane separation loop comprises a conveying pipe for conveying and separating mud and water, an ultrafiltration pump for pumping mud and water to flow, a membrane separator for performing membrane separation on the mud and water, a return pipe for returning the separated sludge to the reaction tower body, a diversion pipe group for flushing the returned sludge into the aerobic zone, and a clear water pipe for discharging the separated clear water outwards; the guide pipe group is annularly arranged in the anaerobic zone and is close to the transverse partition; the ultrafiltration pump and the membrane separator are positioned outside the reaction tower body, the two ends of the conveying pipe are respectively communicated with the sewage inlets of the water collecting device and the membrane separator, and the ultrafiltration pump is connected in a pipeline of the conveying pipe; the two ends of the return pipe are respectively communicated with the sludge outlet of the membrane separator and the guide pipe group, and the clear water pipe is communicated with the clear water outlet of the membrane separator.

Further, the membrane separator is an external ultrafiltration membrane; the diversion pipe group comprises a diversion main pipe which is annular and horizontally arranged in the anaerobic zone and a plurality of diversion branch pipes for making the sludge flush into the aerobic zone to flow back; the plurality of diversion branch pipes are sequentially arranged at intervals along the circumferential direction of the diversion main pipe, the lower end of each diversion branch pipe is communicated with the diversion main pipe, and the opposite upper end of each diversion branch pipe upwards extends into the aerobic zone through a gap between the transverse partition and the reaction tower body.

Furthermore, the small-sized compression station landfill leachate treatment reaction tower also comprises a sludge discharge loop for discharging the sludge after the reaction, wherein the sludge discharge loop comprises a sludge discharge pipe for conveying the sludge and a sludge pump for pumping the sludge to flow; the input end of the sludge discharge pipe is connected with the water collecting device, and the opposite output end of the sludge discharge pipe is connected with sludge dewatering equipment; the sludge pump is connected in the pipeline of the sludge discharge pipe.

The utility model discloses following beneficial effect has:

the utility model adopts the reactor with the high and thin tower structure, the height-diameter ratio of which is 2-4 and the external diameter of which is not more than 3m, the occupied area of the reactor can be reduced to 3X3m and is less than that of the reactors of other treatment processes, and the occupied area is saved by more than 40 percent to the maximum extent, thereby greatly reducing the land requirement and meeting the condition that the occupied area of a small-scale compression station is limited; the reaction tower designed by the utility model adopts the maximum 3X3m section size, which is beneficial to the transportation of skid-mounted finished products, and compared with the large-size reactor which can not be transported and can only be processed on site, the reaction tower has less installation construction workload after reaching the project site, short construction period and meets the requirement of short construction period of small-scale compression stations; the utility model is provided with a transverse function partition, and can form an anoxic zone at the bottom of the horizontal function partition of the reaction tower to complete the denitrification effect by controlling the reflux flow of the muddy water circulation loop, so as to complete the AO denitrification process in the integrated tower, form stable AO process effect, be beneficial to equipment intensification, and strengthen the stirring and denitrification efficiency of the denitrification zone by setting the pulse impact effect of the muddy water circulation loop; the utility model discloses undertake the effect that denitrogenation removed COD in sewage treatment process, through the effect of activated sludge microorganism, high concentration ammonia nitrogen and organic pollutant in the filtration liquid are converted into nitrogen gas and carbon dioxide, mud through nitration, denitrification and are got rid of, therefore this kind of biochemical treatment mode can not cause secondary pollution, the index reaches "sewage discharges into cities and towns sewer water quality standard" (GBT 31962-2015) B level standard after final filtration liquid is handled; the utility model aims at overcoming the not enough of existing MBR process equipment form existence in the scene is used, provide a device and method suitable for small-scale compression station filtration liquid is handled, have activated sludge concentration height, land area is little, the energy consumption low grade advantage.

In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be described in further detail with reference to the drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. In the drawings:

fig. 1 is a schematic structural view of a landfill leachate treatment reaction tower of a small-sized compression station according to a preferred embodiment of the present invention.

Description of the drawings

10. A reaction tower; 101. an aerobic zone; 102. an anaerobic zone; 103. a water inlet; 11. a reaction tower body; 12. a draft tube; 20. transversely separating; 30. a water collection device; 31. a water collection tank; 32. a defoaming box; 40. a mud-water circulation loop; 41. a circulation pipe; 42. a circulation pump; 43. a loop pipe set; 431. a main circulation pipe; 432. a jet branch pipe; 50. an aeration oxygenation loop; 51. an aerator; 52. an air tube; 53. an aeration fan; 60. a membrane separation loop; 61. a delivery pipe; 62. an ultrafiltration pump; 63. a membrane separator; 64. a return pipe; 65. a flow guide pipe group; 651. a flow guide main pipe; 652. a diversion branch pipe; 66. a clear water pipe; 70. a sludge discharge loop; 71. a sludge discharge pipe; 72. a sludge pump.

Detailed Description

The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways, which are defined and covered below.

Referring to fig. 1, the preferred embodiment of the present invention provides a small-sized compression station landfill leachate treatment reaction tower, including: the height-diameter ratio is 2-4 and the external diameter is not more than 3m, a transverse partition 20 which is used for dividing the inner cavity of the reaction tower 10 into an aerobic area 101 and an anaerobic area 102 which are arranged and communicated up and down is arranged in the reaction tower 10, a water collecting device 30 for overflowing muddy water is arranged at the upper end of the reaction tower 10, and the reaction tower 10 is further connected with a muddy water circulating loop 40, an aeration oxygenation loop 50 and a membrane separation loop 60. The muddy water circulating circuit 40 communicates with the water collecting device 30 and the anaerobic zone 102, respectively, for circulating the sewage and the sludge up and down in the reaction tower 10. The aerated oxygenation circuit 50 communicates with the aerobic zone 101 for aerated oxygenation of the aerobic zone 101. The membrane separation loop 60 is respectively communicated with the water collecting device 30 and the anaerobic zone 102, so as to carry out membrane separation on the reacted mud and water, make the separated sludge flow back to the reaction tower 10 again, and discharge the separated clear water outwards.

When the small-sized compression station landfill leachate treatment reaction tower is used, leachate which needs to be subjected to flocculation reaction and solid-liquid separation treatment is adopted, enters the reaction tower 10 and flows upwards, and then overflows to the water collecting device 30; at the moment, the muddy water circulation loop 40 is opened, so that the sewage in the water collecting device 30 is flushed into the anaerobic zone 102, and further the percolate starts to circularly flow in the reaction tower 10; simultaneously, the aeration and oxygenation loop 50 is opened to uniformly charge the sewage with the external air to provide dissolved oxygen for the activated sludge, and simultaneously, the aeration and oxygenation loop 50 sucks water flow, pushes the water flow downwards to the periphery, is folded back by the transverse partition 20, flows upwards and then flows downwards; after the sewage is biodegraded in the reaction tower 10, mud and water are separated through the membrane separation loop 60, the separated sludge flows back into the reaction tower 10 again and provides rectification function and kinetic energy for water flow in the tower, and the separated clear water is directly discharged outwards.

The utility model adopts the reaction tower 10 with the height-diameter ratio of 2-4 and the outer diameter not more than 3m and the tall and thin tower structure, the occupied area of the reaction tower 10 can be reduced to 3X3m and is smaller than that of the reactors of other treatment processes, and the occupied area is saved by more than 40 percent to the maximum extent, thereby greatly reducing the land requirement and meeting the condition that the land area of a small-scale compression station is limited; the reaction tower 10 designed by the utility model adopts the maximum 3X3m section size, which is beneficial to the transportation of skid-mounted finished products, and compared with the large-size reactor which can not be transported and can only be processed on site, the reaction tower has less installation construction amount after reaching the project site, short construction period and meets the requirement of short construction period of the small-scale compression station; the utility model is provided with a transverse function partition, and can form an anoxic zone at the bottom of the horizontal function partition of the reaction tower 10 to complete the denitrification effect by controlling the reflux flow of the muddy water circulation loop 40, so as to complete the AO denitrification process in the integrated tower, form a stable AO process effect, be beneficial to equipment intensification, and strengthen the stirring and denitrification efficiency of the denitrification zone by setting the pulse impact effect of the muddy water circulation loop 40; the utility model discloses undertake the effect that denitrogenation removed COD in sewage treatment process, through the effect of activated sludge microorganism, high concentration ammonia nitrogen and organic pollutant in the filtration liquid are converted into nitrogen gas and carbon dioxide, mud through nitration, denitrification and are got rid of, therefore this kind of biochemical treatment mode can not cause secondary pollution, the index reaches "sewage discharges into cities and towns sewer water quality standard" (GBT 31962-2015) B level standard after final filtration liquid is handled; the utility model aims at overcoming the not enough of existing MBR process equipment form existence in the scene is used, provide a device and method suitable for small-scale compression station filtration liquid is handled, have activated sludge concentration height, land area is little, the energy consumption low grade advantage.

Alternatively, as shown in fig. 1, the reaction tower 10 includes a reaction tower body 11 disposed in a high and thin shape, and a guide cylinder 12 for guiding the flow of the muddy water. The reaction tower body 11 is vertically arranged and is in a hollow cylinder shape with a closed bottom end, the transverse partition 20 is horizontally arranged and is positioned at the lower end of the reaction tower body 11, and a water inlet 103 for sewage to be treated to enter the anaerobic zone 102 is formed in the side wall of the lower end of the reaction tower body 11; in this alternative, the reaction tower body 11 is made of a carbon steel material for corrosion prevention or a stainless steel material. The guide shell 12 is a hollow cylinder with two ends communicated with each other, and is extended and arranged in the aerobic zone 101 along the height direction of the reaction tower body 11. The utility model discloses be provided with draft tube 12 in reaction tower body 11, can oxygenate the plug flow control in return circuit 50 to the aeration, reduce local turbulent flow and energy consumption in the tower, the 12 outsides of draft tube make progress the flow of flow direction simultaneously and can drive the activated sludge stirring, make it not take place deposit evenly distributed in whole reaction tower, further strengthened oxygenating mass transfer effect, improved biochemical reactor's effective volume utilization ratio.

Furthermore, the middle part of the reaction tower body 11 is provided with an upper group of support nets and a lower group of support nets which are horizontally arranged, and an elastic biological filter material is arranged between the two support nets, so that the activated sludge grows and forms a membrane on the filter material, the concentration of microorganisms in the reaction tower is further improved by 2-3 g/L, and the burden on the membrane separation loop 60 can not be caused.

Alternatively, as shown in fig. 1, the water collecting device 30 includes a water collecting tank 31 for collecting water uniformly in the circumferential direction, and a defoaming tank 32 for defoaming the collected muddy water. The water collecting tank 31 is connected to the inner circumferential wall of the upper end of the reaction tower body 11 along the circumferential direction of the reaction tower body 11. The defoaming tank 32 is connected to the outer peripheral wall of the upper end of the reaction tower body 11 and is communicated with the water collecting tank 31. In this alternative, the inflow side of the water collection tank 31 is in a tooth shape, so that the muddy water in the reaction tower body 11 can uniformly enter the water collection tank 31 along the circumferential direction.

Alternatively, as shown in fig. 1, the muddy water circulating circuit 40 includes a circulating pipe 41 for transporting circulation of muddy water, a circulating pump 42 for driving circulation flow of muddy water, and a circulating pipe group 43 for flushing the circulated muddy water into the agitation anaerobic zone 102. The circulating pipe group 43 is annularly arranged in the anaerobic zone 102. Both ends of the circulation pipe 41 are respectively communicated with the water collecting device 30 and the circulation pipe group 43. The circulation pump 42 is connected to the pipe line of the circulation pipe 41. When the device works, the circulating pump 42 is started, sewage in the defoaming box 32 is sent to the reaction tower body 11 through the circulating pipe 41, and leachate starts to flow circularly in the reaction tower 10.

In this alternative, as shown in fig. 1, the circulation pipe group 43 includes a main circulation pipe 431 arranged horizontally in the anaerobic zone 102 in an annular shape, and a plurality of branch jet pipes 432 for flushing muddy water into the anaerobic zone 102 and stirring. A plurality of jet branch pipes 432 are sequentially arranged at intervals in the circumferential direction of the main circulation pipe 431, and the upper end of each jet branch pipe 432 is communicated with the main circulation pipe 431, and the opposite lower end thereof extends obliquely downward toward the center of the main circulation pipe 431.

Optionally, as shown in fig. 1, the aerated oxygenation circuit 50 comprises an aerator 51, an air pipe 52 for conveying air, and an aeration fan 53 for introducing air to form aeration. The aerator 51 is supported on the transverse partition 20 and is positioned below the guide shell 12. The aeration fan 53 is positioned outside the reaction tower body 11, one end of the air pipe 52 is communicated with the aeration fan 53, and the other opposite end extends into the reaction tower body 11 from the top and is connected with the aerator 51 after downwards penetrating the guide cylinder 12. When the device works, the aeration fan 53 is started, air is provided for the aerator 51 through the air pipe 52, and the air is uniformly filled into sewage through the action of the aerator 51 to provide dissolved oxygen for activated sludge; the aerator 51 absorbs water flow from the guide shell 12, pushes the water flow downwards and outwards, is turned back by the transverse partition 20, conducts the water flow through the reaction tower body 11 and the guide shell 12, and then the water flow wraps the activated sludge and upwards reaches the top of the guide shell 12 and enters the guide shell 12 again.

In this alternative, the aerator 51 is a plug flow aerator. The aerator 51 adopted by the utility model is a plug flow aerator, which does not need a jet pump compared with the conventional jet aerator, and can form suction negative pressure to the air pipe 52 by the large-flow plug flow effect, reduce the requirement of 0.2bar aeration fan 53 wind pressure, and realize that the fan saves energy by more than 20%; the utility model benefits from the pressure reduction effect of the aerator 51 on the aeration fan 53, the height of the reaction tower body 11 can be increased without increasing the energy consumption, and the water depth is improved, so that the oxygen charging mass transfer effect is increased from 22% to 32%, the air volume requirement on the aeration fan 53 is reduced, and the energy consumption of the aeration fan 53 is further reduced; the utility model discloses a plug flow type aerator, be applicable to the plug flow stirring effect of low flood peak pressure, push away the flow simultaneously energy consumption and far be less than jet pump greatly, have good activated sludge stirring effect and aeration air water mixed effect.

Alternatively, as shown in fig. 1, the membrane separation circuit 60 includes a delivery pipe 61 for delivering the sludge-water separation, an ultrafiltration pump 62 for pumping the flow of the sludge-water, a membrane separator 63 for performing the membrane separation of the sludge-water, a return pipe 64 for returning the separated sludge to the reaction tower 11, a guide pipe group 65 for flushing the returned sludge into the aerobic zone 101, and a clean water pipe 66 for discharging the separated clean water to the outside. The flow tube set 65 is annularly disposed in the anaerobic zone 102 and adjacent to the transverse partition 20. The ultrafiltration pump 62 and the membrane separator 63 are both positioned outside the reaction tower body 11, the two ends of the conveying pipe 61 are respectively communicated with the sewage inlets of the water collecting device 30 and the membrane separator 63, and the ultrafiltration pump 62 is connected in the pipeline of the conveying pipe 61. Two ends of the return pipe 64 are respectively communicated with a sludge outlet of the membrane separator 63 and the guide pipe group 65, and the clean water pipe 66 is communicated with a clean water outlet of the membrane separator 63. During operation, after being biologically degraded in the reaction tower body 11, sewage enters the membrane separator 63 through the ultrafiltration pump 62 to be subjected to mud-water separation; the sludge separated by the membrane separator 63 enters the diversion pipe group 65 through the return pipe 64 and then enters the reaction tower body 11 again to provide rectification function and kinetic energy for the water flow in the tower, and the clear water separated by the membrane separator 63 is discharged to the discharge port through the clear water pipe 66.

In this alternative, the membrane separator 63 is an external ultrafiltration membrane. The utility model discloses a ready-made external milipore filter carries out mud-water separation to activated sludge in the reaction tower 10, and it pollutes and tolerates concentration stronger than built-in milipore filter, and activated sludge concentration in the reaction tower 10 reaches 15g/L or higher, and generally built-in membrane technology activated sludge concentration is about 10g/L, therefore has improved the treatment effeciency and the ability of reaction tower greatly to the overall dimension of reactor has been reduced. In the alternative, the aperture of the hollow membrane tube adopted by the external ultrafiltration membrane is 0.08-0.15 um.

In this alternative, as shown in fig. 1, the diversion pipe set 65 includes a diversion main pipe 651 disposed in the anaerobic zone 102 in an annular shape and horizontally, and a plurality of diversion branch pipes 652 for making the sludge flow back into the aerobic zone 101. The plurality of diversion branch pipes 652 are sequentially arranged at intervals along the circumferential direction of the diversion main pipe 651, the lower end of each diversion branch pipe 652 is communicated with the diversion main pipe 651, and the opposite upper end of each diversion branch pipe 652 extends upwards into the aerobic zone 101 through a gap between the transverse partition 20 and the reaction tower body 11. The utility model discloses 20 departments are provided with water conservancy diversion nest of tubes 65 at horizontally cross wall, can help the interior rivers guide of tower through mud backward flow, further reduce the energy resource consumption of plug flow aerator, and water conservancy diversion nest of tubes 65 can prevent simultaneously that plug flow from getting into the anoxic zone and causing the denitrogenation function to weaken.

Optionally, as shown in fig. 1, the small-scale compression station landfill leachate treatment reaction tower further comprises a sludge discharge loop 70 for discharging sludge after the reaction is completed, wherein the sludge discharge loop 70 comprises a sludge discharge pipe 71 for conveying the sludge and a sludge pump 72 for pumping the flow of the sludge. The input end of the sludge discharge pipe 71 is connected with the water collecting device 30, and the opposite output end of the sludge discharge pipe is connected with sludge dewatering equipment. A sludge pump 72 is connected in the piping of the sludge discharge pipe 71.

Adopt the utility model discloses percolate after solid-liquid separation handles the back effect as follows:

item	Solid-liquid separation of effluent	MBR effluent	Class B standard
				COD cr	25000	475	500
BOD	10250	46	350
				NH 3 -N	600	11	45
SS	500	40	400

When the utility model is used, the leachate which needs to be processed by flocculation reaction and solid-liquid separation is adopted, and the leachate enters the reaction tower through the sewage inlet pipe communicated with the water inlet 103 and flows upwards, and enters the defoaming box 32 through the water collecting tank 31; at the moment, the circulating pump 42 is started, the sewage in the defoaming box 32 is sent to the circulating pipe group 43 through the circulating pipe 41, and the percolate starts to circularly flow in the reaction tower; meanwhile, the aeration fan 53 is started, air is provided for the plug flow aerator through the air pipe 52, and the air is uniformly filled into the sewage through the action of the plug flow aerator to provide dissolved oxygen for the activated sludge; the plug flow aerator absorbs water flow from the guide shell 12, pushes the water flow downwards to the periphery, is turned back by the transverse partition 20, conducts the water flow through the reaction tower body 11 and the guide shell 12, and leads the water flow to wrap the activated sludge upwards to the top of the guide shell 12 and then enters the guide shell 12 again; after the sewage is biologically degraded in the reaction tower body 11, the sewage enters an external ultrafiltration through an ultrafiltration pump 62 to be subjected to mud-water separation; the sludge separated by the external ultrafiltration enters the diversion pipe group 65 through the return pipe 64 and reenters the reaction tower, and provides rectification function and kinetic energy for water flow in the tower, and clear water separated by the external ultrafiltration is discharged to a discharge port through the clear water pipe 66; sludge generated in the reaction tower is taken into a sludge discharge pipe 71 by a sludge pump 72 and is discharged to a sludge dewatering device for treatment.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The utility model provides a small-size compression station landfill leachate handles reaction tower which characterized in that includes:

the height-diameter ratio is 2-4 and the outer diameter is not more than 3m, a transverse partition (20) which is used for dividing the inner cavity of the reaction tower (10) into an aerobic area (101) and an anaerobic area (102) which are sequentially arranged and communicated up and down is arranged in the reaction tower (10), a water collecting device (30) for overflowing muddy water outwards is arranged at the upper end of the reaction tower (10), and the reaction tower (10) is also connected with a muddy water circulating loop (40), an aeration oxygenation loop (50) and a membrane separation loop (60);

the mud-water circulation loop (40) is respectively communicated with the water collecting device (30) and the anaerobic zone (102) and is used for enabling sewage and sludge to circularly flow up and down in the reaction tower (10);

the aeration oxygenation loop (50) is communicated with the aerobic zone (101) and is used for aerating and oxygenating the aerobic zone (101);

the membrane separation loop (60) is respectively communicated with the water collecting device (30) and the anaerobic zone (102) for carrying out membrane separation on the reacted mud and water, enabling the separated sludge to flow back to the reaction tower (10) again and discharging the separated clear water outwards.

2. The small-sized compression station landfill leachate treatment reaction tower of claim 1, wherein,

the reaction tower (10) comprises a reaction tower body (11) which is arranged in a high and thin type, and a guide cylinder (12) which is used for guiding the flow of the muddy water;

the reaction tower body (11) is vertically arranged and is in a hollow cylinder shape with a closed bottom end, the transverse partition (20) is horizontally arranged and is positioned at the lower end of the reaction tower body (11), and a water inlet (103) for sewage to be treated to enter the anaerobic zone (102) is formed in the side wall of the lower end of the reaction tower body (11);

the guide shell (12) is a hollow cylinder with two communicated ends and is arranged in the aerobic zone (101) in an extending way along the height direction of the reaction tower body (11).

3. The small-sized compression station landfill leachate treatment reaction tower of claim 2, wherein,

the water collecting device (30) comprises a water collecting tank (31) for uniformly collecting water along the circumferential direction and a defoaming tank (32) for defoaming the collected muddy water;

the water collecting tank (31) is connected to the inner peripheral wall of the upper end of the reaction tower body (11) along the circumferential direction of the reaction tower body (11);

the defoaming box (32) is connected to the outer peripheral wall of the upper end of the reaction tower body (11) and is communicated with the water collecting tank (31).

4. The small-sized compression station landfill leachate treatment reaction tower of claim 1, wherein,

the muddy water circulating loop (40) comprises a circulating pipe (41) for conveying the muddy water to circulate, a circulating pump (42) for driving the muddy water to circulate, and a circulating pipe group (43) for flushing the circulated muddy water into the stirring anaerobic zone (102);

the circulating pipe group (43) is annularly arranged in the anaerobic zone (102);

two ends of the circulating pipe (41) are respectively communicated with the water collecting device (30) and the circulating pipe group (43);

the circulation pump (42) is connected to the pipe line of the circulation pipe (41).

5. The small-sized compression station landfill leachate treatment reaction tower of claim 4, wherein,

the circulating pipe group (43) comprises a circulating main pipe (431) which is annular and is horizontally arranged in the anaerobic zone (102), and a plurality of jet branch pipes (432) which are used for flushing muddy water into the anaerobic zone (102) for stirring;

the plurality of jet branch pipes (432) are sequentially arranged at intervals along the circumferential direction of the main circulation pipe (431), the upper end of each jet branch pipe (432) is communicated with the main circulation pipe (431), and the opposite lower end of each jet branch pipe extends downwards in an inclined mode towards the center of the main circulation pipe (431).

6. The small-sized compression station landfill leachate treatment reaction tower of claim 2, wherein,

the aeration oxygenation loop (50) comprises an aerator (51), an air pipe (52) for conveying air, and an aeration fan (53) for introducing air to form aeration;

the aerator (51) is supported on the transverse partition (20) and is positioned below the guide shell (12);

the aeration fan (53) is positioned outside the reaction tower body (11), one end of the air pipe (52) is communicated with the aeration fan (53), and the other opposite end of the air pipe is extended into the reaction tower body (11) from the top and is connected with the aerator (51) after downwards penetrating through the guide cylinder (12).

7. The small-sized compression station landfill leachate treatment reaction tower of claim 6, wherein,

the aerator (51) is a plug flow aerator.

8. The small-sized compression station landfill leachate treatment reaction tower of claim 1, wherein,

the membrane separation loop (60) comprises a conveying pipe (61) for conveying mud and water for separation, an ultrafiltration pump (62) for pumping mud and water to flow, a membrane separator (63) for performing membrane separation on the mud and water, a return pipe (64) for returning the separated sludge to the reaction tower body (11), a guide pipe group (65) for flushing the returned sludge into the aerobic zone (101), and a clear water pipe (66) for discharging separated clear water outwards;

the diversion pipe group (65) is annularly arranged in the anaerobic zone (102) and is close to the transverse partition (20);

the ultrafiltration pump (62) and the membrane separator (63) are positioned outside the reaction tower body (11), two ends of the conveying pipe (61) are respectively communicated with the sewage inlets of the water collecting device (30) and the membrane separator (63), and the ultrafiltration pump (62) is connected in a pipeline of the conveying pipe (61);

two ends of the return pipe (64) are respectively communicated with a sludge outlet of the membrane separator (63) and the guide pipe group (65), and the clear water pipe (66) is communicated with a clear water outlet of the membrane separator (63).

9. The small-sized compression station landfill leachate treatment reaction tower of claim 8, wherein,

the membrane separator (63) is an external ultrafiltration membrane;

the diversion pipe group (65) comprises a diversion main pipe (651) which is annular and horizontally arranged in the anaerobic zone (102), and a plurality of diversion branch pipes (652) which are used for making sludge rush into the aerobic zone (101) to flow back;

the plurality of flow guide branch pipes (652) are sequentially arranged at intervals along the circumferential direction of the flow guide main pipe (651), the lower end of each flow guide branch pipe (652) is communicated with the flow guide main pipe (651), and the opposite upper end of each flow guide branch pipe (652) upwards extends into the aerobic zone (101) through a gap between the transverse partition (20) and the reaction tower body (11).

10. The small-sized compression station landfill leachate treatment reaction tower of claim 1, wherein,

the small-sized compression station landfill leachate treatment reaction tower also comprises a sludge discharge loop (70) for discharging the sludge after the reaction, wherein the sludge discharge loop (70) comprises a sludge discharge pipe (71) for conveying the sludge and a sludge pump (72) for pumping the flow of the sludge;

the input end of the sludge discharge pipe (71) is connected with the water collecting device (30), and the opposite output end of the sludge discharge pipe is connected with sludge dewatering equipment;

the sludge pump (72) is connected to the pipeline of the sludge discharge pipe (71).

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