CN209759260U - Landfill leachate membrane method deep treatment system - Google Patents

Abstract

The utility model discloses a landfill leachate embrane method advanced treatment system, including the MBR subsystem, the NF subsystem, RO subsystem and DTRO subsystem, filtration liquid gets into the MBR subsystem, the play water of MBR subsystem gets into MBR clear liquid case, clear liquid entering NF subsystem in the MBR clear liquid case, the clear liquid that the NF subsystem separates gets into NF clear liquid case, clear liquid entering RO subsystem in the NF clear liquid case, the dense solution that the NF subsystem separates gets into the dense solution case, the fresh water export of RO subsystem links to each other with fresh water tank, the dense water export of RO subsystem links to each other with the dense solution case, the play water of dense solution case gets into the DTRO subsystem, the fresh water export of DTRO subsystem links to each other with fresh water tank, the dense water that the DTRO subsystem separates gets into the recharge tank. After the landfill leachate is subjected to advanced treatment by the membrane method advanced treatment system, the municipal wastewater discharge standard can be met.

Description

landfill leachate membrane method deep treatment system

Technical Field

The utility model belongs to the technical field of domestic waste handles, concretely relates to landfill leachate embrane method degree of depth processing system.

Background

The domestic refuse landfill is mainly carried out in a refuse mixing collection and mixing landfill mode, the refuse has complex composition components, and the refuse leachate is high-concentration organic wastewater which is formed by deducting the saturated water holding capacity of refuse and a soil covering layer from the moisture contained in the refuse landfill, rain, snow and water entering the landfill and other moisture, and passing through the refuse layer and the soil covering layer.

The landfill leachate not only contains oxygen-consuming organic pollutants, but also contains various metals and plant nutrients (ammonia nitrogen and the like); the BOD5 and COD concentration is high and far higher than that of urban sewage; the organic pollutants are various, and include non-chlorinated aromatic compounds such as naphthalene and phenanthrene, chlorinated aromatic compounds, phosphate esters, phthalate esters, phenolic compounds, aniline compounds and the like which are difficult to biodegrade; the landfill leachate contains more than ten metal ions, and the heavy metal ions can inhibit microorganisms; high content of ammonia nitrogen, imbalance of C/N ratio and lack of phosphorus element. Because the components of the landfill leachate are complex, the treatment difficulty of the landfill leachate is high, the landfill leachate treated by the pretreatment system cannot be directly discharged, and further advanced treatment is needed.

Disclosure of Invention

To the technical problem, the utility model aims at providing a can carry out deep purification to landfill leachate, make its landfill leachate embrane method degree of depth processing system who finally reaches municipal wastewater discharge standard.

Therefore, the utility model discloses the technical scheme who adopts does: a membrane-process advanced treatment system for landfill leachate comprises an MBR subsystem, an NF subsystem, an RO subsystem and a DTRO subsystem, wherein leachate purified by a pretreatment system is pressurized and conveyed to the MBR subsystem through a membrane system water inlet pump, effluent of the MBR subsystem enters an MBR clear liquid tank, clear liquid in the MBR clear liquid tank is pressurized and conveyed to the NF subsystem through the NF water inlet pump, biochemical sludge separated by the MBR subsystem flows back to the pretreatment system for secondary treatment, clear liquid separated by the NF subsystem enters the NF clear liquid tank, clear liquid in the NF clear liquid tank is pressurized and conveyed to the RO subsystem through the RO water inlet pump, concentrated liquid separated by the NF subsystem enters a concentrated liquid tank, a fresh water outlet of the RO subsystem is connected with a fresh water tank, a concentrated water outlet of the RO subsystem is connected with a concentrated liquid tank, and effluent of the concentrated liquid tank is pressurized and conveyed to the DTRO subsystem through the DTRO water inlet pump, and a fresh water outlet of the DTRO subsystem is connected with a fresh water tank, and concentrated water separated by the DTRO subsystem enters a recharge tank and is pressurized and conveyed to a refuse landfill for recharging treatment through a recharge pump.

Preferably, the water outlet of the fresh water tank is connected with a discharge tank, a sampling pump is arranged in the discharge tank, and the effluent in the discharge tank can be discharged to a sewage treatment plant for subsequent treatment after reaching the standard through detection. By adopting the structure, whether the treated sewage reaches the discharge standard or not can be rapidly detected, and the treatment effect is checked.

Preferably, the water outlet of the discharge pool is connected with a Parshall flow tank, and the measured water is discharged. By adopting the structure, the discharged water yield can be measured, and statistics and management are facilitated.

The utility model has the advantages that: after the landfill leachate is subjected to advanced treatment by the membrane method advanced treatment system, advanced purification is obtained, the treated leachate can reach the urban wastewater discharge standard, and is discharged into a sewage treatment plant for subsequent treatment, so that the landfill leachate is prevented from polluting the environment.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a landfill leachate pretreatment system and the structure of the utility model is schematically illustrated

Detailed Description

The invention will be further described by way of examples with reference to the accompanying drawings:

As shown in fig. 1, the membrane advanced treatment system for landfill leachate comprises a membrane system water inlet pump 22, an MBR subsystem 23, an MBR clear liquid tank 24, an NF water inlet pump 25, an NF subsystem 26, an NF clear liquid tank 27, an RO water inlet pump 28, an RO subsystem 29, a concentrated liquid tank 30, a DTRO water inlet pump 31, a DTRO subsystem 32, a recharge tank 33, a recharge pump 34, a fresh water tank 35, a discharge tank 36 and a baschel flow tank 37, wherein the MBR subsystem 23 is an external membrane bioreactor system, the NF subsystem 26 is a nanofiltration system, the RO subsystem 29 is a reverse osmosis system, and the DTRO subsystem 32 is a disc tube reverse osmosis system. The membrane method deep treatment system purifies the percolate step by step through multi-layer filtration, and finally reaches the urban wastewater discharge standard.

As shown in fig. 1, the landfill leachate purified by the pretreatment system is pressurized and transported to an MBR subsystem 23 through a membrane system inlet pump 22, biochemical sludge in the leachate is separated by the MBR subsystem 23 and flows back to an anoxic section 12a of a first-stage anoxic and aerobic biochemical reactor to be described below for secondary treatment, a water outlet of the MBR subsystem 23 is connected with an MBR clear liquid tank 24, the leachate treated by the MBR subsystem 23 is stored in the MBR clear liquid tank 24, the leachate in the MBR clear liquid tank 24 is pressurized and transported to an NF subsystem 26 through an NF inlet pump 25, pollutants such as macromolecular organic matters in the leachate are effectively removed through the filtering action of the NF subsystem 26, a concentrated water outlet of the NF subsystem 26 is connected with a concentrated liquid tank 30, a fresh water outlet is connected with an NF clear liquid tank 27, the leachate in the NF clear liquid tank 27 is pressurized and transported into an RO subsystem 29 through an RO pump 28, in the RO subsystem, residual pollutants such as ammonia nitrogen, total phosphorus, micromolecular organic matters and the like in the leachate are effectively removed, a fresh water outlet of the RO subsystem 29 is connected with a fresh water tank 35, a concentrated water outlet is connected with a concentrated solution tank 30, concentrated solution of the concentrated solution tank 30 is pressurized and conveyed into a DTRO subsystem 32 through a DTRO water inlet pump 31, in the DTRO subsystem 32, the concentrated solution is further concentrated and separated into fresh water and concentrated water, the fresh water outlet of the DTRO subsystem 32 is connected with a fresh water tank 35, the concentrated water outlet is connected with a recharging tank 33, the concentrated water in the recharging tank 33 is conveyed to a refuse landfill for recharging treatment through a recharging pump 34, the water outlet of the fresh water tank 35 is connected with a discharge pool 36, a sampling pump is arranged in the discharge pool 36, the water quality of the water in the discharge pool 36 is sampled and detected by the sampling pump, the water outlet of the discharge pool 36 is connected with the Parshall flow tank 37, the discharge amount can be measured, and the water in the discharge pool 36 can be reserved in the Parshall flow tank 37 to be measured and discharged after the detection reaches the standard.

As shown in fig. 2, the membrane-process advanced treatment system for landfill leachate is used for purifying leachate treated by the pretreatment system for landfill leachate, and the landfill leachate treated by the pretreatment system for landfill leachate can meet the water quality requirement of the inlet water of the membrane-process advanced treatment system: COD is less than or equal to 1200mg/L, TN and less than or equal to 200mg/L, ammonia nitrogen is less than or equal to 150mg/L and conductivity is less than or equal to 15000us/cm, the landfill leachate pretreatment system consists of a physicochemical pretreatment subsystem and a biochemical treatment subsystem, and the physicochemical pretreatment subsystem consists of a leachate collecting tank 1, a water inlet lifting pump 2, a bag filter 3, a coagulant dosing device 14, a coagulation reaction tank 4, a flocculant dosing device 15, a flocculation reaction tank 5, a sedimentation tank 6, a sludge tank 7, a sludge pressure pump 8 and a filter press 9; the biochemical treatment subsystem consists of a conditioning tank 10, a denitrification carbon source dosing device 21, a biochemical lift pump 11, a first-stage anoxic and aerobic biochemical reactor 12, a second-stage anoxic and aerobic biochemical reactor 13, a first-stage reflux pump 17, a second-stage reflux pump 19, a first-stage jet aeration pump 18, a second-stage jet aeration pump 20 and a biochemical water outlet tank 16.

As shown in figure 2, the physicochemical pretreatment subsystem removes large-particle impurities, suspended matters and the like in the landfill leachate through filtration, coagulation reaction, flocculation reaction and precipitation, the leachate in the leachate collection pool 1 is pressurized and lifted by a water inlet lifting pump 2 and enters a bag filter 3, the large-particle impurities in the leachate are intercepted and removed by a fine filter bag in the bag filter 3, the water outlet of the bag filter 3 is connected with a coagulation reaction tank 4, the water outlet of the coagulation reaction tank 4 is connected with a flocculation reaction tank 5, orange drug is added into the coagulation reaction tank 4 through a coagulant adding device 14 to be used as coagulant, the leachate is subjected to coagulation reaction, suspended pollutants in the leachate and the coagulant generate fine alum flocs, the water outlet of the coagulation reaction tank 4 is connected with the flocculation reaction tank 5, the leachate automatically flows into the flocculation reaction tank 5 after coagulation reaction, white drug is added into the flocculation reaction tank 5 through a flocculant device 15 to be used as flocculant, the leachate is subjected to flocculation reaction, previous fine alum flocs and a flocculating agent generate large alum flocs together, a water outlet of a flocculation reaction tank 5 is connected with a precipitation tank 6, the leachate after flocculation reaction automatically flows into the precipitation tank 6 to be precipitated, the sludge precipitated in a bottom mud bucket of the precipitation tank 6 enters a sludge pool 7, the sludge in the sludge pool 7 is conveyed to a filter press 9 through a sludge pressure pump 8 to be subjected to filter pressing and dehydration, in the embodiment, the filter press 9 adopts a box-type filter press, the filter pressing water of the filter press 9 is discharged to a trench, the dehydrated sludge is conveyed to a refuse landfill to be treated, the leachate forms supernatant on the upper part of the precipitation tank 6, and the leachate automatically flows into a biochemical treatment system.

As shown in figure 2, the biochemical treatment subsystem removes most of total nitrogen pollutants and ammonia nitrogen pollutants in the percolate through denitrification and nitrification, the supernatant in the precipitation tank 6 enters the tempering tank 10, the percolate after the homogenization, the uniform tempering and the quality adjustment in the tempering tank 10 is pressurized and lifted by a biochemical lifting pump 11 to enter an anoxic section 12a of the first-stage anoxic and aerobic biochemical reactor, a water outlet of the anoxic section 12a of the first-stage anoxic and aerobic biochemical reactor is connected with an aerobic section 12b of the first-stage anoxic and aerobic biochemical reactor, a water outlet part of the aerobic section 12b of the first-stage anoxic and aerobic biochemical reactor flows back to the anoxic section 12a of the first-stage anoxic and aerobic biochemical reactor through a first-stage reflux pump 17, the rest part enters an anoxic section 13a of the second-stage anoxic and aerobic biochemical reactor, and a denitrification carbon source is added into the anoxic section 12a of the first-stage anoxic and aerobic biochemical reactor through a denitrification chemical adding device 21, denitrifying microorganisms are subjected to a denitrifying denitrification reaction to remove most of total nitrogen pollutants in the leachate, oxygen is filled into the aerobic section 12b of the first-stage anoxic and aerobic biochemical reactor through a first-stage jet aeration pump 18 in the aerobic section 12b of the first-stage anoxic and aerobic biochemical reactor, the ammonia nitrogen pollutants in the leachate are subjected to a nitrification reaction under aerobic conditions by the nitrifying microorganisms to remove most of the ammonia nitrogen pollutants, and the effluent of the aerobic section 12b of the first-stage anoxic and aerobic biochemical reactor is refluxed to the water inlet end of the anoxic section 12a of the first-stage anoxic and aerobic biochemical reactor through a first-stage reflux pump 17 to ensure that the denitrifying reaction is normally carried out; the water outlet of the anoxic section 13a of the second-stage anoxic and aerobic biochemical reactor is connected with the aerobic section 13b of the second-stage anoxic and aerobic biochemical reactor, the water outlet part of the aerobic section 13b of the second-stage anoxic and aerobic biochemical reactor returns to the anoxic section 13a of the second-stage anoxic and aerobic biochemical reactor through a second-stage reflux pump 19, the rest part enters a biochemical water outlet groove 16, the sludge precipitated in the aerobic section 13b of the second-stage anoxic and aerobic biochemical reactor is discharged into a sludge tank 7, a denitrification carbon source is added into the anoxic section 13a of the second-stage anoxic and aerobic biochemical reactor through a denitrification carbon source dosing device 21, denitrification reaction is carried out on denitrification microorganisms, total nitrogen pollutants in the percolate are removed again, oxygen is filled into the aerobic section 13b of the second-stage anoxic and aerobic biochemical reactor 13 through a second-stage jet aeration pump 20, nitrifying microorganisms enable ammonia nitrogen pollutants in the percolate to carry out nitration reaction under aerobic condition, remove the ammonia nitrogen pollutants again, and enable the effluent of the aerobic section 13b of the secondary anoxic and aerobic biochemical reactor to flow back to the water inlet end of the anoxic section 13a of the secondary anoxic and aerobic biochemical reactor in large flow through a secondary reflux pump 19, so that normal denitrification reaction is ensured; the effluent of the aerobic section 13b of the second-stage anoxic-aerobic biochemical reactor automatically flows into a biochemical effluent tank 16.

Claims (3)

1. A landfill leachate embrane method advanced treatment system which characterized in that: the system comprises an MBR subsystem, an NF subsystem, an RO subsystem and a DTRO subsystem, wherein percolate purified by a pretreatment system is pressurized and conveyed to the MBR subsystem through a membrane system water inlet pump, effluent of the MBR subsystem enters an MBR clear liquid tank, clear liquid in the MBR clear liquid tank is pressurized and conveyed to the NF subsystem through the NF water inlet pump, biochemical sludge separated by the MBR subsystem flows back to the pretreatment system for secondary treatment, clear liquid separated by the NF subsystem enters the NF clear liquid tank, clear liquid in the NF clear liquid tank is pressurized and conveyed to the RO subsystem through the RO water inlet pump, concentrated liquid separated by the NF subsystem enters a concentrated liquid tank, a fresh water outlet of the RO subsystem is connected with a fresh water tank, a concentrated water outlet of the RO subsystem is connected with the concentrated liquid tank, effluent of the concentrated liquid tank is pressurized and conveyed to the DTRO subsystem through the DTRO water inlet pump, and a fresh water outlet of the DTRO subsystem is connected with the fresh water tank, and the concentrated water separated by the DTRO subsystem enters a recharge tank and is pressurized and conveyed to a refuse landfill for recharging treatment through a recharge pump.

2. The membrane process advanced treatment system for landfill leachate according to claim 1, wherein: the fresh water tank is characterized in that a water outlet of the fresh water tank is connected with a discharge tank, a sampling pump is arranged in the discharge tank, and effluent in the discharge tank can be discharged to a sewage treatment plant for subsequent treatment after reaching the standard through detection.

3. The membrane process advanced treatment system for landfill leachate according to claim 2, characterized in that: and a water outlet of the discharge pool is connected with the Parshall flow tank and is discharged after being metered.