CN213506454U - Leachate treatment system for sanitary landfill - Google Patents

Abstract

The utility model discloses a leachate treatment system for a sanitary landfill site of garbage, which is characterized by comprising a denitrification tank, a coagulation unit, an immersed MBR tank and a desalting device which are sequentially communicated according to the flow direction of leachate; the denitrification tank, the coagulation unit and the immersed MBR tank are connected with a sludge discharge pipe, and the sludge discharge pipe is connected with a filter pressing device; the denitrification tank comprises a tank A, an SBR tank, a water outlet tank I, a homogenizing tank I, an anaerobic ammonia oxidation tank communicated with the homogenizing tank I, a homogenizing tank II communicated with the anaerobic ammonia oxidation tank, a sulfur autotrophic denitrification tank communicated with the homogenizing tank II, and a water outlet tank II communicated with the sulfur autotrophic denitrification tank; the coagulation unit comprises a coagulation tank connected with the water outlet tank II, and an air flotation tank and a sedimentation tank connected with the coagulation tank; the coagulation tank is provided with a stirring device and a dosing device, and the coagulation tank is controlled by a valve switch, and the effluent of the coagulation tank is conveyed to an air flotation tank or a sedimentation tank.

Description

Leachate treatment system for sanitary landfill

Technical Field

The utility model relates to a landfill leachate handles technical field, especially relates to a landfill leachate treatment system.

Background

The landfill method is widely applied in China due to low treatment cost, but landfill leachate is inevitably generated in the landfill process and after the landfill is finished. The landfill leachate is high-concentration organic wastewater with complex components, contains various toxic and harmful substances, and has the characteristics of high COD (chemical oxygen demand), high ammonia nitrogen and high total nitrogen, wherein the COD concentration is as high as about 10000-20000 mg/L, and the ammonia nitrogen and total nitrogen concentration is as high as about 1500-2000 mg/L. If the treatment is improper, the pollution can be caused to water resources, surrounding soil and atmospheric environment, so that the health of human bodies is threatened, and the significance of sanitary landfill is lost. Therefore, properly treating the leachate generated in the landfill process, and eliminating the influence of the landfill leachate on the environment are the most important measures for preventing secondary pollution.

At present, biochemical treatment of landfill leachate is generally used for pretreatment and advanced treatment of the landfill leachate, and biological denitrification and carbon removal treatment is generally used as a main process due to low cost and good effect. However, the landfill leachate is special wastewater with complex components, high organic matters, high ammonia nitrogen and high salinity, the water quality of the landfill leachate changes along with the time, the pH value of the landfill leachate at the later stage is alkalescent, the BOD5/COD ratio is reduced and is generally lower than 0.1, the biodegradability is poor, the ammonia nitrogen content is increased, and the C/N is low, which undoubtedly causes great difficulty for the biological treatment of the landfill leachate. Therefore, the development of the high-efficiency and energy-saving landfill leachate biological treatment process is significant. The traditional nitrification and denitrification nitrogen removal method faces the problems of standard discharge and energy saving and consumption reduction. On one hand, when the carbon-nitrogen ratio of the inlet water is low and the available organic carbon source is insufficient, a large amount of external carbon source is required to be added to achieve the effect of complete denitrification. On the other hand, the aeration energy consumption required by the nitrification process greatly increases the power consumption and the operating cost of the sewage treatment plant. In addition, the treatment of a large amount of excess sludge in the conventional biological denitrification process further increases the operating cost of sewage plants.

Disclosure of Invention

To the problem that exists among the prior art, the utility model aims to provide a high efficiency, low cost and guarantee go out sanitary landfill leachate treatment system of water quality.

In order to achieve the above purpose, the utility model adopts the following technical scheme.

A leachate treatment system for a sanitary landfill of garbage is characterized by comprising a denitrification tank, a coagulation unit, an immersed MBR tank and a desalting device which are sequentially communicated according to the flow direction of leachate; the denitrification tank, the coagulation unit and the immersed MBR tank are connected with a sludge discharge pipe, and the sludge discharge pipe is connected with a filter pressing device; the denitrification tank comprises a tank A, a SBR tank, a water outlet tank I, a homogenizing tank I, an anaerobic ammonia oxidation tank communicated with the homogenizing tank I, a homogenizing tank II communicated with the anaerobic ammonia oxidation tank II, a sulfur autotrophic denitrification tank communicated with the homogenizing tank II and a water outlet tank II communicated with the sulfur autotrophic denitrification tank; the coagulation unit comprises a coagulation tank connected with the water outlet tank II, and an air flotation tank and a sedimentation tank connected with the coagulation tank; the coagulation tank is provided with a stirring device and a dosing device, and the coagulation tank is controlled by a valve switch, and the effluent of the coagulation tank is conveyed to the air floatation tank or the sedimentation tank.

As a further explanation of the above scheme, an SBR pool reflux device connected with the SBR pool is arranged on the a pool, a secondary outlet pool reflux device connected with the secondary outlet pool and a secondary homogenizing pool reflux device connected with the secondary homogenizing pool are arranged on the primary homogenizing pool, and a secondary outlet pool sludge discharge pipe connected with the filter pressing equipment and a water outlet pipe connected with the coagulation unit are arranged on the secondary outlet pool.

As a further explanation of the above scheme, an aeration pipe and a membrane module are arranged at the bottom of the immersed MBR tank, the aeration pipe is connected with a blower, the blower is connected with an aeration and oxygenation switch, and the immersed MBR tank controls facultative or aerobic conditions through the aeration and oxygenation switch.

As a further explanation of the above scheme, an MBR tank water inlet pipe connected to the coagulation unit water outlet, an MBR membrane module water outlet pipe, and a backwash pipe are disposed on the submerged MBR tank, an MBR tank suction pump is disposed on the MBR membrane module water outlet pipe, and an MBR tank backwash pump is disposed on the backwash pipe.

As a further explanation of the above scheme, the desalination device comprises a DTRO device, an MVR device, an electrodialysis device and a nanofiltration device, and the desalination device controls the outlet water of the submerged MBR tank to be conveyed to any desalination device through a valve switch.

As a further explanation of the scheme, the device also comprises accident pools, each pool is connected with a vent pipe, each vent pipe is connected with the accident pool, and the accident pool is connected with the water inlet end of the denitrification pool.

As a further explanation of the above scheme, an anammox tank water distribution pipe is arranged at the bottom of the anammox tank, an anammox filler is arranged above the anammox tank water distribution pipe, an anammox tank water outlet weir plate is arranged at the top of the anammox tank, and an internal reflux device is arranged on the anammox tank.

As a further explanation of the above scheme, a water distribution pipe of the sulfur autotrophic denitrification pool is arranged at the bottom of the sulfur autotrophic denitrification pool, sulfur filler is arranged above the water distribution pipe of the sulfur autotrophic denitrification pool, and a water outlet weir plate of the sulfur autotrophic denitrification pool is arranged at the top of the sulfur autotrophic denitrification pool.

As a further explanation of the above scheme, an SBR pool water impeller and an SBR pool water decanter are arranged on the SBR pool, and the SBR pool water decanter flows the SBR pool water to the first water outlet pool; and a PH probe, an ORP on-line analyzer, a temperature probe and a dissolved oxygen meter are arranged in the SBR tank.

As a further explanation of the above scheme, a pool A impeller is arranged in the pool A, an overflowing hole is arranged on the side wall of the pool A, and the supernatant in the pool A flows to the SBR pool through the overflowing hole; and a PH probe, an ORP on-line analyzer, a temperature probe and a dissolved oxygen meter are arranged in the A pool.

The utility model has the advantages that:

the method mainly aims at the problem of comprehensive treatment of aged household garbage landfill leachate with unbalanced carbon-ammonia ratio, considering aging and concentration of leachate, combining fresh leachate, mixed liquor of kitchen waste and other carbon sources, performing ammonia nitrogen removal on the landfill leachate through short-range digestion denitrification-anaerobic ammonia oxidation-sulfur autotrophic denitrification, removing inorganic matters through a coagulation unit, removing organic matters in the leachate through an MBR (membrane bioreactor) tank, and removing salt through a desalting device, so that the problems of large carbon source adding amount, large sludge yield and the like in the traditional biochemical process treatment process are solved, and the quality of effluent water treated by the leachate is further provided while the production cost is reduced.

Drawings

Fig. 1 shows a flow chart of the leachate treatment system of the sanitary landfill site.

Fig. 2 shows a process flow chart of the leachate treatment system of the sanitary landfill site.

FIG. 3 is a plan view of a denitrification tank of the leachate treatment system of a sanitary landfill site.

Fig. 4 shows a cross-sectional view 2-2 of fig. 3.

Fig. 5 is a cross-sectional view taken at 5-5 of fig. 3.

Fig. 6 is a cross-sectional view taken at 4-4 of fig. 3.

Fig. 7 is a cross-sectional view taken at 3-3 of fig. 3.

Fig. 8 is a plan view of the coagulation tank of the leachate treatment system of the sanitary landfill site.

Fig. 9 is a cross-sectional view of fig. 8 taken along line 1-1.

Fig. 10 is a schematic structural view of a vertical flow type air flotation tank of the leachate treatment system of the refuse sanitary landfill site according to the present invention.

Fig. 11 is a schematic structural view of the vertical sedimentation tank of the leachate treatment system of the sanitary landfill site.

Fig. 12 is a plan view of the immersed MBR tank of the leachate treatment system of the sanitary landfill site of garbage.

Fig. 13 is a cross-sectional view taken at 2-2 of fig. 12.

Fig. 14 is a plan view of the accident pool of the leachate treatment system of the sanitary landfill site according to the present invention.

FIG. 15 shows a cross-sectional view of FIG. 14 taken along line 1-1.

Description of reference numerals:

1: denitrogenation pond, 2: coagulation unit, 3: submerged MBR tank, 4: desalting device, 5: press and press

Filtration apparatus, 6: aeration blower, 7: a medicine adding pot.

101: water inlet pipe, 102: SBR tank reflux pipe, 103: SBR pool blow-down pipe, 104: aeration main pipe, 105: one emptying pipe of the water outlet pool, 106: a water inlet pipe of the homogenizing tank, 107: homogenizing tank one blow pipe, 108: a return pipe of the water outlet pool II, 109: second return pipe of homogenizing tank, 110: AX-2 tank inlet pipe, 111: AX-1 tank inlet pipe, 112: AX-1 tank internal reflux pipe, 113: AX-2 tank internal reflux pipe, 114: sdad-1 pool inlet pipe, 115: sdad-2 pool inlet pipe, 116: outlet pool two mud pipe, 117: outlet pipe, 118: SdAd-2 cell vent, 119: pool A emptying pipe, 120: overflowing hole, 121: microporous aerator pipe, 122: water outlet pipe of decanter, 123: AX pond effluent weir, 124: perforated water distribution pipe of AX tank, 125: AX pool filler, 126: AX pool filler holder, 127: AX pool filler securing rope, 128: sdad pool effluent weir, 129: packing and supporting plate, 130: SdAD pool sulfur filler, 131: filler support plate bracket, 132: SdAD pool water distribution pipe.

201: vertical flow air supporting pond inlet tube, 202: vertical sedimentation tank inlet tube, 203: PAM dosing tube, 204: PAC dosing tube, 205: coagulation tank vent pipe, 206: agitator support frame, 207: central draft tube, 208: bubble generator, 209: air flotation tank reflecting plate, 210: dissolved air tank intake pipe, 211: sludge discharge pipe of air floatation tank, 212: water outlet pipe of air floatation tank, 213: sedimentation tank center draft tube, 214: sedimentation tank emitter plate, 215: mud bucket, 216: sedimentation tank sludge discharge pipe, 217: sedimentation tank outlet pipe, 218: a water outlet groove.

301: confluence inlet tube, 302: backwash pipe, 303: membrane module outlet pipe, 304: MBR tank sludge discharge pipe, 305: aeration connecting pipe, 306: membrane module, 307: MBR pond blow-down pipe, 308: walkway plate floating outside the pool top, 309: pool top outer floating railing, 310: membrane module holder, 311: aerator pipe bracket, 312: an aeration pipe.

401: accident pool outlet pipe, 402: pump pit, 403: grille cover plate, 404: reinforced concrete side wall, 405: a reinforced concrete bottom plate.

1S 01: pool a, flow pusher, 1S 02: SBR tank flow pusher, 1S 03: SBR tank decanter, 1S 04: pool a water intake pump, 1S 05: SBR tank reflux pump, 1S 06: homogenizing pool one water inlet pump, 1S 07: AX pool intake pump, 1S 08: SdAD pool water inlet pump, 1S 09: homogenizing tank two-way reflux pump, 1S 10: outlet pool two reflux pump, 1S 11: AX tank internal reflux pump, 1Y 01: PH probe, 1Y 02: ORP online analyzer, 1Y 03: temperature probe, 1Y 04: dissolved oxygen meter, 1Y 05: electromagnetic flow meter, 2S 01: stirrer, 3S 01: vertical flow type air flotation tank water inlet pump, 3S 02: slag scraper, 3S 03: air compressor, 3Y 01: air flotation cell electromagnetic flow meter, 4S 01: vertical sedimentation tank water pump, 4Y 01: sedimentation tank electromagnetic flowmeter, 5S 01: MBR tank suction pump, 5S 02; MBR tank backwash pump, 6S 01; a submersible sewage pump.

Detailed Description

In the description of the present invention, it should be noted that, for the orientation words, if there are terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the orientation and positional relationship indicated are based on the orientation or positional relationship shown in the drawings, and only for the convenience of describing the present invention and simplifying the description, it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and not be construed as limiting the specific scope of the present invention.

Furthermore, if the terms "first" and "second" are used for descriptive purposes only, they are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. Thus, the definition of "a first" or "a second" feature may explicitly or implicitly include one or more of the features, and in the description of the invention, "at least" means one or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "assembled", "connected", and "connected", if any, are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; or may be a mechanical connection; the two elements can be directly connected or connected through an intermediate medium, and the two elements can be communicated with each other. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific situations.

In the present application, unless otherwise specified or limited, "above" or "below" a first feature may include the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other through another feature therebetween. Also, the first feature being "above," "below," and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply an elevation which indicates a level of the first feature being higher than an elevation of the second feature. The first feature being "above", "below" and "beneath" the second feature includes the first feature being directly below or obliquely below the second feature, or merely means that the first feature is at a lower level than the second feature.

The following description will be further made in conjunction with the accompanying drawings of the specification, so that the technical solution and the advantages of the present invention are clearer and clearer. The embodiments described below are exemplary and are intended to be illustrative of the present invention, but should not be construed as limiting the invention.

Example one

As shown in fig. 1-2, a leachate treatment system for a sanitary landfill of garbage is characterized by comprising a denitrification tank 1, a coagulation unit 2, an immersed MBR tank 3 and a desalination device 4 which are connected in sequence according to the flow direction of leachate; sludge generated by the denitrification tank 1, the coagulation unit 2 and the immersed MBR tank 3 is conveyed to a filter pressing device 5 through a sludge discharge pipe and is pressed into a sludge cake and then is buried; the denitrification tank 1 and the immersed MBR tank 3 are connected with an aeration blower 6, and the coagulation unit 2 is connected with a dosing tank 7.

Referring to fig. 3 to 7, the denitrification tank 1 includes a tank a, a tank SBR, a first water outlet tank, a first homogenizing tank, an AX-1 tank and an AX-2 tank communicated with the first homogenizing tank, a second homogenizing tank communicated with the AX-1 tank and the AX-2 tank, a SdAD-1 tank and a SdAD-2 tank communicated with the second homogenizing tank, and a second water outlet tank communicated with the SdAD-1 tank and the SdAD-2 tank. The device comprises an AX-1 pool, an AX-2 pool, a SBR pool backflow device, a homogenizing pool, an inner backflow device, a denitrification pool mud discharge pipe and a water outlet pipe, wherein the SBR pool backflow device is arranged on the pool A and connected with the SBR pool, the homogenizing pool backflow device is arranged on the pool I and is connected with the outlet pool II and is arranged on the homogenizing pool II, the inner backflow device is arranged on the homogenizing pool II and is connected with the AX-2 pool, and the denitrification pool mud discharge pipe is connected with filter pressing equipment and is connected with a water outlet pipe connected with a coagulating unit. The SBR tank is a short-cut nitrification denitrification tank, the AX tank is an anaerobic ammonia oxidation tank, and the SdAD tank is a sulfur autotrophic denitrification tank.

The tank A is connected with a water inlet pipe 101 for leading in percolate, a tank A emptying pipe 119 and an SBR tank return pipe 102 connected with the SBR tank; the water inlet pipe 101 is provided with an A pool water inlet pump 1S04 and an electromagnetic flowmeter 1Y05, and the SBR pool return pipe 102 is provided with an SBR pool return pump 1S05 and an electromagnetic flowmeter 1Y 05. And an SBR tank emptying pipe 103 is connected to the SBR tank. The first water outlet tank is connected with a first water outlet tank emptying pipe 105 and a first homogenizing tank water inlet pipe 106 connected with the first homogenizing tank, and the first homogenizing tank water inlet pipe 106 is provided with a first homogenizing tank water inlet pump 1S06 and an electromagnetic flow meter 1Y 05. The first homogenizing pool is connected with a first homogenizing pool emptying pipe 107, an AX-1 pool water inlet pipe 111 connected with the AX-1 pool, an AX-2 pool water inlet pipe 110 connected with the AX-2 pool, a second homogenizing pool return pipe 109 connected with the second homogenizing pool, and a second water outlet pool return pipe 108 connected with the second water outlet pool; the AX-1 pool water inlet pipe 111 and the AX-2 pool water inlet pipe 110 are both provided with an AX water inlet pump 1S07 and an electromagnetic flowmeter 1Y05, the second homogenizing pool return pipe 109 is provided with a second homogenizing pool return pump 1S09 and an electromagnetic flowmeter 1Y05, and the second water outlet pool return pipe 108 is provided with a second water outlet pool return pump 1S10 and an electromagnetic flowmeter 1Y 05. The AX-1 tank is connected with an AX-1 tank internal return pipe 112, two ends of which are respectively connected with the top and the bottom of the AX-1 tank; the AX-2 tank is connected with an AX-2 tank internal return pipe 113, two ends of which are respectively connected with the top and the bottom of the AX-2 tank; an AX internal reflux pump 1S11 is provided to both the AX-1 tank internal reflux pipe 112 and the AX-2 tank internal reflux pipe 113. A second homogenizing tank emptying pipe, a SdAD-1 tank water inlet pipe 114 connected with the SdAD-1 tank, and a SdAD-2 tank water inlet pipe 115 connected with the SdAD-2 tank are connected to the second homogenizing tank; the SdAD water inlet pump 1S08 and the electromagnetic flowmeter 1Y05 are arranged on the SdAD-1 pool water inlet pipe 114 and the SdAD-2 pool water inlet pipe 115. The SdAD-1 pool is connected with a SdAD-1 pool emptying pipe; the SdAD-2 pool is connected with a SdAD-2 pool emptying pipe 118. The second water outlet pool is connected with a second water outlet pool sludge discharge pipe 116 connected with the sludge storage tank and a water outlet pipe 117 connected with the coagulation unit, and the water outlet pipe 117 is provided with a filter.

An overflowing hole 120 is formed in the side wall of the tank A close to the top, and the upper layer liquid of the tank A flows from the tank A to the SBR through the overflowing hole 120. A pool plug flow device 1S01 is arranged in the pool A, and a water inlet connected with the water inlet pipe 101 is arranged at the position, close to the bottom, of the pool A.

An SBR pool flow pusher 1S02 and an SBR decanter 1S03 are arranged in the SBR pool; the water decanter outlet pipe 122 of the SBR water decanter 1S03 is connected with the water outlet pool, and the SBR water decanter conveys water in the SBR pool to the first water outlet pool. The bottom of the SBR tank is provided with a microporous aeration pipe 121, and the microporous aeration pipe 121 is connected with the aeration blower through an aeration main pipe 104. And a PH probe 1Y01, an ORP online analyzer 1Y02, a temperature probe 1Y03 and a dissolved oxygen meter 1Y04 are arranged in the A pool and the SBR pool.

A PH probe 1Y01 and a temperature probe 1Y03 are arranged in the first homogenizing pool; and a PH probe 1Y01 is arranged in the second homogenizing pool.

A PH probe 1Y01 and an ORP online analyzer 1Y02 are arranged in the AX-1 pool and the AX-2 pool; the bottom of each of the AX-1 tank and the AX-2 tank is provided with an AX tank perforated water distribution pipe 124 connected with the corresponding water inlet pipe, an AX tank filler 125 is arranged above the AX perforated water distribution pipe 124, and the AX tank filler 123 is fixed through an AX tank filler bracket 126 and an AX tank filler fixing rope 127. And the top parts of the AX-1 pool and the AX-2 pool are provided with AX pool water outlet weir plates 123, and the AX pool water outlet weir plates are used for conveying the upper layer water of the AX-1 pool and the AX-2 pool to the second homogenizing pool.

SdAD pool water distribution pipes 132 connected with corresponding water inlet pipes are distributed at the bottoms of the SdAD-1 pool and the SdAD-2 pool, SdAD pool sulfur fillers 130 are arranged above the SdAD pool water distribution pipes 132, the SdAD pool sulfur fillers 130 are supported by filler bearing plate supports 131, and filler bearing plates 129 are arranged at the tops of the SdAD pool sulfur fillers. And SdAD pool effluent weir plates 128 are arranged at the tops of the SdAD-1 pool and the SdAD-2 pool.

As shown in fig. 8 and 9, the coagulation unit 2 includes a coagulation tank connected to the water outlet pipe 117, and a vertical flotation tank and a vertical sedimentation tank connected to the coagulation tank; and controlling the coagulation tank to be communicated with the vertical flow type air flotation tank or the vertical flow type sedimentation tank through a valve switch, wherein the coagulation tank and the vertical flow type air flotation tank or the vertical flow type sedimentation tank can be communicated only with one.

Two stirrer support frames 206 are arranged on the coagulation tank, and a stirrer 2S01 is arranged on each stirrer support frame 206. The coagulation tank is connected with a dosing device, the dosing device comprises a PAC dosing pipe 204 and a PAM dosing pipe 203 which are arranged on the coagulation tank, the PAC dosing pipe 204 is connected with a PAC dosing tank, and the PAM dosing pipe 203 is connected with the PAM dosing tank; the PAC dosing pipe 204 and the PAM dosing pipe 203 extend into the bottom of the coagulation tank along the top of the coagulation tank. Two coagulation tank emptying pipes 205 are connected to the coagulation tank; and a vertical flow type air flotation tank water inlet pipe 201 for discharging water to the vertical flow type air flotation tank and a vertical flow type sedimentation tank water inlet pipe 202 for discharging water to the vertical flow type sedimentation tank are connected to the coagulation tank.

Referring to fig. 10, a central guide cylinder 207, a bubble generator 208 located at the bottom of the vertical air flotation tank, and a slag scraper 3S02 located at the top of the vertical air flotation tank are disposed in the vertical air flotation tank; the bottom of the central guide flow cylinder is connected with an air floatation tank reflection plate 209, the bubble generator 208 is connected with a dissolved air tank, and the dissolved air tank is connected with the air compressor 3S03 through an air inlet pipe 210 of the dissolved air tank. A sludge tank matched with the slag scraper is arranged on one side of the vertical flow type air floatation tank, and the sludge tank is connected with an air floatation tank sludge discharge pipe 211; and a water collecting tank communicated with the vertical flow type air floatation tank is arranged on the periphery of the vertical flow type air floatation tank, and an air floatation tank water outlet pipe 212 is arranged at the bottom of the water collecting tank. A vertical flow type air floatation tank water inlet pump 3S01 and an air floatation tank electromagnetic flow meter 3Y01 are arranged on the vertical flow type air floatation tank water inlet pipe 201.

Referring to fig. 11, a sedimentation tank central draft tube 213, a mud bucket 215 located at the bottom of the vertical sedimentation tank, and a water outlet groove 218 located at the periphery of the upper end of the vertical sedimentation tank are provided on the vertical sedimentation tank; the bottom of the sedimentation tank central guide cylinder 213 is connected with a sedimentation tank reflection plate 214, the bottom of the mud bucket 215 is provided with a sedimentation tank mud pipe 216, and the water outlet groove 218 is provided with a sedimentation tank water outlet pipe 217. A vertical sedimentation tank water inlet pump 4S01 and a sedimentation tank electromagnetic flowmeter 4Y01 are arranged on the vertical sedimentation tank water inlet pipe.

Referring to fig. 12 and 13, an aeration pipe 312 is laid at the bottom of the submerged MBR tank 3, the aeration pipe 312 is connected to the aeration blower through an aeration connection pipe 305, and the aeration pipe 312 is fixed at the bottom of the submerged MBR tank through an aeration pipe support 311. A membrane module 306 is arranged above the aeration pipe 312, and the membrane module 306 is fixedly installed through a membrane module bracket 310 fixedly arranged at the bottom of the submerged MBR tank. And an outside pool top drift walkway plate 308 and an outside pool top drift railing 309 are arranged outside the immersed MBR pool. The aeration blower is connected with an aeration switch, and the facultative/aerobic conditions of the immersed MBR tank are controlled by controlling the aeration switch.

And a confluence water inlet pipe 301 connected with the vertical flow type air flotation tank and the vertical flow type sedimentation tank, a membrane component water outlet pipe 303 connected with the membrane component and a backwashing pipe 302 are connected to the immersed MBR tank. An MBR tank suction pump 5S01 is arranged on the water outlet pipe of the membrane module; and an MBR tank back-flushing pump 5S02 is arranged on the back-flushing pipe. An MBR tank emptying pipe 307 and an MBR tank sludge discharge pipe 304 are connected to the immersed MBR tank.

The desalting device 4 is one or more of a DTRO device, an MVR device, an electrodialysis device and a nanofiltration device. The desalting device is connected with the membrane module water outlet pipe 303 and controls the inlet of the effluent of the immersed MBR tank through a valve.

Referring to fig. 14 and 15, the leachate treatment system for a sanitary landfill of garbage according to this embodiment further includes an accident tank connected to the emptying pipes of all the tanks, and the water outlet pipe 401 of the accident tank is connected to the front end of the water inlet pipe of the tank a, and conveys the liquid in the accident tank to the front end of the water inlet pipe of the tank a and then enters the leachate treatment system for a sanitary landfill of garbage. The accident pool is composed of reinforced concrete side plates 404 and a reinforced concrete bottom plate 405. A grid cover plate 403 is arranged at the top of the accident pool, and a pump pit 402 for accommodating a submersible sewage pump 6S01 is arranged at the bottom of the accident pool.

The filter pressing equipment 5 comprises a plate-and-frame filter press and a sludge storage tank connected with the plate-and-frame filter press, and the sludge discharge pipes are connected with the sludge storage tank. And carrying out filter pressing on the sludge by a plate-and-frame filter press to obtain a sludge cake, and then conveying the sludge cake to a designated area for landfill.

And steel rainsheds are arranged on the denitrification tank, the coagulation unit, the immersed MBR tank, the desalting device and the accident tank.

It is further preferred that an overtaking pipe is provided between the water inlet pipe 101 and the coagulation unit, and when the conventional process needs to be studied, the permeate inlet water directly goes beyond the denitrification tank to enter the coagulation unit.

It will be understood by those skilled in the art from the foregoing description of the structure and principles that the present invention is not limited to the specific embodiments described above, and that modifications and substitutions based on the known art are intended to fall within the scope of the invention, which is defined by the claims and their equivalents. The details not described in the detailed description are prior art or common general knowledge.

The utility model discloses in, MBR is the abbreviation of Membrane bioreactor Membrane Bio-Reactor, SBR is the abbreviation of sequencing batch Reactor activated sludge process, AX is the abbreviation of AnAMMOX, SDAD is the abbreviation of sulphur autotrophic Denitrification sulfurfu-Autotufphic degradation, PAC is the abbreviation of PolyAluminium Chloride, PAM is the abbreviation of Polyacrylamide, A is the abbreviation of anaerobism Anoxic.

Claims (10)

1. A leachate treatment system for a sanitary landfill of garbage is characterized by comprising a denitrification tank, a coagulation unit, an immersed MBR tank and a desalting device which are sequentially communicated according to the flow direction of leachate; the denitrification tank, the coagulation unit and the immersed MBR tank are connected with a sludge discharge pipe, and the sludge discharge pipe is connected with a filter pressing device;

the denitrification tank comprises a tank A, a SBR tank, a water outlet tank I, a homogenizing tank I, an anaerobic ammonia oxidation tank communicated with the homogenizing tank I, a homogenizing tank II communicated with the anaerobic ammonia oxidation tank II, a sulfur autotrophic denitrification tank communicated with the homogenizing tank II and a water outlet tank II communicated with the sulfur autotrophic denitrification tank;

the coagulation unit comprises a coagulation tank connected with the water outlet tank II, and an air flotation tank and a sedimentation tank connected with the coagulation tank; the coagulation tank is provided with a stirring device and a dosing device, and the coagulation tank is controlled by a valve switch, and the effluent of the coagulation tank is conveyed to the air floatation tank or the sedimentation tank.

2. The landfill leachate treatment system of claim 1, wherein the tank A is provided with a SBR tank backflow device connected with the SBR tank, the first homogenizing tank is provided with a second outlet tank backflow device connected with the second outlet tank and a second homogenizing tank backflow device connected with the second homogenizing tank, and the second outlet tank is provided with a second outlet tank sludge discharge pipe connected with the filter pressing device and a water outlet pipe connected with the coagulation unit.

3. The leachate treatment system of claim 1, wherein an aeration pipe and a membrane module are arranged at the bottom of the submerged MBR tank, the aeration pipe is connected with a blower, the blower is connected with an aeration switch, and the submerged MBR tank is controlled to have facultative or aerobic conditions by the aeration switch.

4. The landfill leachate treatment system of claim 3, wherein the submerged MBR tank is provided with an MBR tank inlet pipe connected to the coagulation unit outlet, an MBR membrane module outlet pipe, and a backwash pipe, the MBR membrane module outlet pipe is provided with an MBR tank suction pump, and the backwash pipe is provided with an MBR tank backwash pump.

5. The landfill leachate treatment system of claim 1, wherein the desalination device comprises a DTRO device, an MVR device, an electrodialysis device and a nanofiltration device, and the desalination device controls the delivery of the effluent of the submerged MBR tank to any of the desalination devices through a valve switch.

6. The landfill leachate treatment system of claim 1, further comprising an accident tank, each tank being connected to a vent pipe, each vent pipe being connected to the accident tank, the accident tank being connected to the water inlet of the denitrification tank.

7. The landfill leachate treatment system of claim 1, wherein an anammox tank water distributor is arranged at the bottom of the anammox tank, anammox filler is arranged above the anammox tank water distributor, an anammox tank effluent weir plate is arranged at the top of the anammox tank, and an internal reflux device is arranged on the anammox tank.

8. The landfill leachate treatment system of claim 1, wherein a water distributor of the sulfur autotrophic denitrification tank is arranged at the bottom of the sulfur autotrophic denitrification tank, sulfur filler is arranged above the water distributor of the sulfur autotrophic denitrification tank, and a water outlet weir plate of the sulfur autotrophic denitrification tank is arranged at the top of the sulfur autotrophic denitrification tank.

9. The landfill leachate treatment system of claim 1, wherein the SBR tank is provided with an SBR tank plug flow device and an SBR tank decanter, and the SBR tank decanter flows SBR tank effluent to the effluent tank I; and a PH probe, an ORP on-line analyzer, a temperature probe and a dissolved oxygen meter are arranged in the SBR tank.

10. The landfill leachate treatment system of claim 1, wherein a tank A plug flow device is disposed in the tank A, an overflowing hole is disposed on a side wall of the tank A, and the supernatant in the tank A flows to the SBR through the overflowing hole; and a PH probe, an ORP on-line analyzer, a temperature probe and a dissolved oxygen meter are arranged in the A pool.

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