CN116375206A - Aged garbage leachate treatment device and method - Google Patents
Aged garbage leachate treatment device and method Download PDFInfo
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- CN116375206A CN116375206A CN202310663362.8A CN202310663362A CN116375206A CN 116375206 A CN116375206 A CN 116375206A CN 202310663362 A CN202310663362 A CN 202310663362A CN 116375206 A CN116375206 A CN 116375206A
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- 238000000034 method Methods 0.000 title claims abstract description 47
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 84
- 239000007788 liquid Substances 0.000 claims abstract description 66
- 239000000706 filtrate Substances 0.000 claims abstract description 60
- 230000003647 oxidation Effects 0.000 claims abstract description 57
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 57
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 42
- 238000001914 filtration Methods 0.000 claims abstract description 42
- 239000012528 membrane Substances 0.000 claims abstract description 42
- 238000001728 nano-filtration Methods 0.000 claims abstract description 40
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims abstract description 38
- 230000008569 process Effects 0.000 claims abstract description 37
- 238000005728 strengthening Methods 0.000 claims abstract description 20
- 230000007704 transition Effects 0.000 claims abstract description 9
- 239000000149 chemical water pollutant Substances 0.000 claims description 49
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 30
- 238000003756 stirring Methods 0.000 claims description 21
- 230000000694 effects Effects 0.000 claims description 19
- 239000011259 mixed solution Substances 0.000 claims description 17
- 239000000243 solution Substances 0.000 claims description 17
- 230000009194 climbing Effects 0.000 claims description 15
- 229910052757 nitrogen Inorganic materials 0.000 claims description 15
- 238000000926 separation method Methods 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 239000012535 impurity Substances 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 9
- 230000000149 penetrating effect Effects 0.000 claims description 7
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 6
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 6
- 241001330002 Bambuseae Species 0.000 claims description 6
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 6
- 239000011425 bamboo Substances 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- 230000001174 ascending effect Effects 0.000 claims description 4
- 238000007781 pre-processing Methods 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 11
- 229910052799 carbon Inorganic materials 0.000 abstract description 11
- 238000004140 cleaning Methods 0.000 description 11
- 239000010802 sludge Substances 0.000 description 11
- 230000008021 deposition Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- QJZYHAIUNVAGQP-UHFFFAOYSA-N 3-nitrobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid Chemical compound C1C2C=CC1C(C(=O)O)C2(C(O)=O)[N+]([O-])=O QJZYHAIUNVAGQP-UHFFFAOYSA-N 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- 241000191025 Rhodobacter Species 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000003028 elevating effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000004021 humic acid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/04—Backflushing
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Water Supply & Treatment (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Microbiology (AREA)
- Biodiversity & Conservation Biology (AREA)
- Nanotechnology (AREA)
- Chemical Kinetics & Catalysis (AREA)
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Abstract
The invention belongs to the technical field of garbage treatment, and particularly relates to an aged garbage leachate treatment device and a method thereof, comprising a sub-filtering device, an eduction tube, a mixing drum and an oxidation strengthening treatment device, wherein the sub-filtering device comprises a central drum and a transition drum which is arranged on the outer wall of the central drum in an annular array manner, a nanofiltration membrane for separating ammonia nitrogen-containing filtrate is embedded between the central drum and the transition drum, one end of a bottom ring tube is connected with a liquid-separating tube connected with an inlet of the anaerobic ammonia oxidation treatment device, the output end of the anaerobic ammonia oxidation treatment device is connected with the eduction tube for guiding the anaerobic ammonia oxidation treated filtrate into the mixing drum, and one side of the bottom of the mixing drum is connected with a mixed liquid eduction tube for guiding the mixed liquid into the oxidation strengthening treatment device. The invention can reduce the influence of COD on the denitrification process, and ensure the denitrification efficiency when the invention has the advantages of low carbon, energy saving and denitrification.
Description
Technical Field
The invention belongs to the technical field of garbage treatment, and particularly relates to an aged garbage leachate treatment device and method.
Background
The old landfill leachate often has the following two characteristics: 1. the ammonia nitrogen concentration is high and reaches 2000-3500 mg/L; 2. the COD concentration is relatively low and is 2000-4000 mg/L, and most of the COD is humic acid which is difficult to biodegrade; if the conventional nitrification-denitrification process is used, COD in the aged garbage percolate is often the COD which is difficult to biodegrade, and carbon sources required by denitrification are added additionally, 1000mg/L ammonia nitrogen is added, the consumption of the carbon sources is up to COD above 5000mg/L, the adding cost of the carbon sources is high, and a large amount of sludge is generated. The minimum carbon energy-saving biological denitrification technology is anaerobic ammonia oxidation, ammonia nitrogen can be removed almost without a carbon source, and the method has the advantages of low aeration energy consumption, low carbon and the like. However, the high concentration of the difficultly biodegradable COD and other impurities in the percolate can cause stronger interference to the rhodobacter anaerobically ammoxidation.
Disclosure of Invention
The invention aims to provide an aged garbage leachate treatment device and a method thereof, which can reduce the influence of COD on the denitrification process, so that the device can ensure the denitrification efficiency when having the advantages of low carbon, energy saving and denitrification.
The technical scheme adopted by the invention is as follows:
the aged landfill leachate treatment device comprises a sub-filtering device, an eduction tube, a mixing drum and an oxidation strengthening treatment device, wherein the sub-filtering device comprises a central drum and sub-filtering drums which are annularly arranged on the outer wall of the central drum, the sub-filtering drums are communicated with the central drum and are used for collecting filtrate containing high-concentration ammonia nitrogen components separated from landfill leachate, and nanofiltration membranes used for separating ammonia nitrogen-containing filtrate are embedded between the central drum and the sub-filtering drums;
the filter cartridges are connected with a bottom ring pipe through a bottom pipeline, one end of the bottom ring pipe is connected with a liquid separating pipe connected with an inlet of the anaerobic ammonia oxidation treatment device, and a valve III for controlling the circulation inside the liquid separating pipe is fixedly arranged in the middle of the liquid separating pipe; the bottom of the middle-arranged barrel is connected with a liquid outlet pipe connected with the top of the mixing barrel, one end of the liquid outlet pipe is fixedly provided with a valve II for controlling the circulation inside the liquid outlet pipe, the output end of the anaerobic ammonia oxidation treatment device is connected with a delivery pipe for guiding filtrate subjected to anaerobic ammonia oxidation treatment into the mixing barrel, one side of the bottom of the mixing barrel is connected with a mixed liquid outlet pipe for guiding mixed liquid into the oxidation strengthening treatment device, and two ends of the mixed liquid outlet pipe are provided with a power pump for extracting the mixed liquid and a valve IV for controlling the circulation inside the mixed liquid outlet pipe;
the top of the middle-arranged barrel is integrally and fixedly provided with a transition barrel, the top end of the transition barrel is fixedly connected with a liquid inlet pipe for guiding garbage percolate, and one end of the liquid inlet pipe is provided with a valve I for controlling the circulation inside the liquid inlet pipe; the top of each sub-filter cylinder is fixedly connected with a pressurizing pipe, a piston is movably arranged at the top end of the inside of each pressurizing pipe, a spring is arranged in each pressurizing pipe and below the piston, the top end of each pressurizing pipe is fixedly connected with a branch pipe, and the tail ends of the branch pipes are connected with a liquid inlet pipe in an inclined tee way;
the utility model discloses a separation assistance subassembly that divides filter equipment's inside to assemble has and is used for accelerating separation to contain ammonia nitrogen filtrate, separation assistance subassembly includes the pole of wearing that constitutes movable grafting relation with put a section of thick bamboo in, put the outer wall of a section of thick bamboo in and install the cylinder that is used for controlling the pole lift and remove, wear the end of pole and be located in a section of thick bamboo inside fixed mounting in common, just the bottom of inner frame rotates the group and has the helping hand dish, the through-hole has been seted up to the annular array in edge of helping hand dish, just helping hand dish lower surface and the position department that corresponds the through-hole all are provided with the blank pipe, the inside of through-hole all is fixed and is provided with the baffle plate, and the inside movable mounting of blank pipe has interior annular plate, the surface edge of interior annular plate is provided with the stores pylon that is used for hanging the baffle plate, the equal fixedly connected with sloping bearing plate in the bottom of blank pipe, the equal fixedly connected with puddler that is used for the stirring in the lower surface edge of helping hand dish.
The height dimension of the middle-arranged barrel is larger than that of the sub-filtering barrel, and the volume of the inner space of the pressurizing pipe is larger than that of the whole branch pipe.
The inner diameter of the inner ring plate is smaller than the diameter of the baffle plate, and the inclined bearing plate and the stirring rod are arranged alternately.
The tail end of the delivery pipe is fixedly connected with an outer ring pipe, the outer ring pipe is fixedly arranged outside the mixing drum, and the inner side of the outer ring pipe is fixedly connected with an inclined inlet pipe in an annular array mode.
The inside integral type of mixing drum is fixed and is provided with interior barrel, the inside of interior barrel is inserted to the end slope of oblique income pipe.
The edge annular array type mixing drum is fixedly provided with an outer guide frame, the inner sides of the outer guide frames are respectively and slidably assembled with a climbing machine, and the inner sides of the climbing machines are respectively and fixedly provided with a magnet.
The inner wall of the inner cylinder body and the position close to the outer guide frame are fixedly provided with the inner guide frame, an inner net rack is assembled in the inner lifting type of the inner cylinder body, an end metal sliding block is fixedly arranged on the edge annular array of the inner net rack, and the end metal sliding block is slidably arranged in the inner guide frame.
The upper surface of the inner net rack is rotatably assembled with a turbine blade rack, and blades with inclination angles are fixedly arranged on the inner side of the turbine blade rack in an annular array mode.
The lower surface of the circle center of the turbine blade frame is fixedly provided with a bottom disc, the bottom disc is arranged below the circle center of the inner net frame, the circle center of the inner net frame is fixedly provided with a limit stop in an annular array mode, and the outer wall of the edge of the bottom disc is fixedly provided with a bulge in an array mode.
The aged garbage leachate treatment method uses the aged garbage leachate treatment device, and comprises the following specific steps:
s1: preprocessing old landfill leachate in a middle-placed cylinder to separate filtrate containing high-concentration ammonia nitrogen components, temporarily storing the separated filtrate in a filter cylinder, and compressing organic matters which are difficult to biodegrade and other suspended and colloidal impurities in concentrated liquid;
s2: after a certain volume of landfill leachate is injected into the middle cylinder, the injection process is stopped, and meanwhile, the cylinder is started to drive the booster disc to reciprocate, and in the process of descending of the booster disc, each through hole is blocked by the inner annular plate, so that the booster disc can give downward pressure to the landfill leachate, the filtration work is quickened, in the process of ascending of the booster disc, the through holes are dredged, and the landfill leachate can give a certain pressure to the inclined carrier plate and drive the booster disc to rotate in the process of penetrating through the through holes, and the stirring rod is matched to realize the stirring effect, so that the landfill leachate at other positions is stirred to the nanofiltration membrane;
s3: the filtered liquid of the nanofiltration membrane contains high-concentration ammonia nitrogen, and other impurities have low content, and an efficient anaerobic ammonia oxidation treatment device can be adopted to remove ammonia nitrogen and total nitrogen in water, wherein a valve III is opened to lead the filtrate in each sub-filter cartridge into the anaerobic ammonia oxidation treatment device for anaerobic ammonia oxidation treatment;
s4: the filtrate after anaerobic ammonia oxidation denitrification treatment is led into the inner cylinder body through a delivery pipe, the concentrated solution which is originally positioned in the middle cylinder is also led into the inner cylinder body through a liquid outlet pipe, at the moment, the filtrate and the concentrated solution are mixed again, and at the moment, most ammonia nitrogen and total nitrogen in the mixed solution are removed by an anaerobic ammonia oxidation treatment device, so that only non-biodegradable COD and other substances are left;
s5: and opening a power pump and a valve IV, introducing the mixed solution into an oxidation strengthening treatment device for biochemical strengthening treatment, and further removing ammonia nitrogen and total nitrogen in COD and water, so that the treated percolate reaches the national specified discharge standard.
The invention has the technical effects that:
(1) The invention firstly carries out pretreatment on the aged garbage leachate, separates filtrate containing high-concentration ammonia nitrogen components, and the filtrate filtered by the nanofiltration membrane contains high-concentration ammonia nitrogen, can adopt a high-efficiency anaerobic ammonia oxidation treatment device to remove ammonia nitrogen and total nitrogen in the water, and is mixed with the concentrated water of the nanofiltration membrane after anaerobic ammonia oxidation denitrification treatment.
(2) In the self-cleaning operation of the nanofiltration membrane, the filtrate reversely passes through the nanofiltration membrane, and particles which are originally blocked in gaps of the nanofiltration membrane are washed out, so that the self-cleaning effect of the nanofiltration membrane is achieved, the cleaning operation of the nanofiltration membrane can be realized, the function of the equipment is increased, the long-term use of the nanofiltration membrane can be ensured, the operation of manually and periodically disassembling the equipment to clean the nanofiltration membrane is omitted, in addition, the cleaning operation of the nanofiltration membrane is realized without additional electric equipment, only the valve I and the valve III are needed to be respectively closed, the cleaning operation of the nanofiltration membrane is completed by virtue of the process of injecting garbage percolate, and the investment of other electric equipment is omitted while the equipment is simplified.
(3) According to the invention, after a certain volume of landfill leachate is injected into the middle cylinder, the injection process is stopped, and the cylinder is started to drive the power-assisted disc to reciprocate, so that the filtration speed of the landfill leachate can be accelerated in the reciprocating elevating process of the power-assisted disc, and the landfill leachate at different positions can be driven to continuously approach the nanofiltration membrane, so that the landfill leachate can be fully contacted with the nanofiltration membrane, and the filtration efficiency of the landfill leachate is indirectly improved.
(4) According to the invention, as the tail end of the inclined inlet pipe is obliquely inserted into the inner cylinder body, a certain flow effect is generated between filtrate and concentrated liquid in the mixing cylinder after the filtrate enters the inner cylinder body, and the internal mixed liquid can generate a vortex-like flow process under the impact of tangential water flow, so that the mixing effect of the filtrate and the concentrated liquid is improved.
(5) In order not to influence the effect of pumping mixed liquid by the power pump, at the moment, each climbing machine is started to enable the magnet to climb along the outer guide frame, the inner guide frame also climbs inside the inner cylinder body under the action of magnetic force, the turbine blade frame and the inner net frame simultaneously rotate relatively, blades in the turbine blade frame can block gaps of the inner net frame, so that the turbine blade frame and the inner net frame can drive more sludge to move upwards when climbing, the problem of sludge deposition is solved, the problem of blocking the power pump caused by the sludge deposition is solved, and the work load of the power pump is reduced.
Drawings
FIG. 1 is a combined schematic diagram of a processing apparatus provided by an embodiment of the present invention;
FIG. 2 is a schematic diagram of a combination of a filter and a mixing drum according to an embodiment of the present invention;
FIG. 3 is a schematic diagram showing a combination of an anaerobic ammonium oxidation treatment device, a mixing drum and an oxidation strengthening treatment device according to an embodiment of the present invention;
FIG. 4 is an assembled cross-sectional view of a split filter device and a split assist assembly according to an embodiment of the present invention;
FIG. 5 is a block diagram of a separation assist assembly provided by an embodiment of the present invention;
FIG. 6 is an exploded view of an assembly of a power disc with an inner ring plate provided by an embodiment of the present invention;
FIG. 7 is a cross-sectional top view of a mixing drum according to an embodiment of the present invention;
fig. 8 is an assembled bottom exploded view of an inner aft frame and turbine blade frame provided by an embodiment of the present invention.
In the drawings, the list of components represented by the various numbers is as follows:
1. a separating and filtering device; 101. a middle cylinder; 102. a transition barrel; 103. a liquid inlet pipe; 104. a valve I; 105. a filter cartridge; 106. nanofiltration membrane; 107. a liquid outlet pipe; 108. a second valve; 109. a bottom collar; 110. a liquid separating pipe; 111. a third valve; 112. a pressurizing pipe; 113. a piston; 114. a spring; 115. a branch pipe; 2. a separation assisting component; 201. penetrating the rod; 202. a cylinder; 203. an inner frame; 204. a booster disc; 205. a through hole; 206. a baffle plate; 207. an inner ring plate; 208. a hanging rack; 209. a bevel carrier plate; 210. a stirring rod; 3. an anaerobic ammoxidation treatment device; 4. a delivery tube; 401. an outer collar; 402. a slant pipe; 5. a mixing drum; 501. a mixed liquid outlet pipe; 502. a power pump; 503. a valve IV; 504. an inner cylinder; 505. an outer guide frame; 506. an inner guide frame; 507. an inner net rack; 508. an end metal slider; 509. a magnet; 510. a climbing machine; 511. a limit stop; 512. a turbine blade holder; 513. a bottom disc; 514. a protrusion; 6. oxidation strengthening treatment device.
Detailed Description
The present invention will be specifically described with reference to examples below in order to make the objects and advantages of the present invention more apparent. It should be understood that the following text is intended to describe only one or more specific embodiments of the invention and does not limit the scope of the invention strictly as claimed.
As shown in fig. 1-8, the aged garbage leachate treatment device comprises a separating and filtering device 1, a delivery pipe 4, a mixing drum 5 and an oxidation strengthening treatment device 6.
Embodiment one:
referring to fig. 4, the sub-filtration device 1 comprises a central cylinder 101 and sub-filtration cylinders 105 which are annularly arranged on the outer wall of the central cylinder 101, wherein the sub-filtration cylinders 105 are communicated with the central cylinder 101 and are used for collecting filtrate containing high-concentration ammonia nitrogen components separated from landfill leachate, and nanofiltration membranes 106 for separating ammonia nitrogen-containing filtrate are embedded between the central cylinder 101 and the sub-filtration cylinders 105.
Referring to fig. 1 to 3, all the filter cartridges 105 are commonly connected with a bottom ring pipe 109 through a bottom pipe, one end of the bottom ring pipe 109 is connected with a liquid separating pipe 110 connected with an inlet of the anaerobic ammonia oxidation treatment device 3, and a valve III 111 for controlling the internal circulation of the liquid separating pipe 110 is fixedly arranged in the middle of the liquid separating pipe 110; the bottom of the middle-arranged barrel 101 is connected with a liquid outlet pipe 107 connected with the top of the mixing barrel 5, one end of the liquid outlet pipe 107 is fixedly provided with a valve II 108 for controlling the internal circulation of the liquid outlet pipe 107, the output end of the anaerobic ammonia oxidation treatment device 3 is connected with a delivery pipe 4 for guiding filtrate subjected to anaerobic ammonia oxidation treatment into the mixing barrel 5, one side of the bottom of the mixing barrel 5 is connected with a mixed liquid outlet pipe 501 for guiding mixed liquid into the oxidation strengthening treatment device 6, and two ends of the mixed liquid outlet pipe 501 are provided with a power pump 502 for pumping mixed liquid and a valve IV 503 for controlling the internal circulation of the mixed liquid outlet pipe 501.
According to the structure, the old landfill leachate in the middle cylinder 101 is pretreated to separate filtrate containing high-concentration ammonia nitrogen components, the separated filtrate is temporarily stored in the filter cylinder 105, and organic matters which are difficult to biodegrade and other suspended and colloidal impurities are compressed in the concentrated solution; opening a valve III 111 to lead the filtrate in each sub-filter cylinder 105 into the anaerobic ammonia oxidation treatment device 3 for anaerobic ammonia oxidation treatment, removing high-concentration ammonia nitrogen in the filtrate, leading the filtrate after anaerobic ammonia oxidation denitrification treatment into the inner cylinder 504 through the leading-out pipe 4, leading the concentrated solution which is originally positioned in the middle cylinder 101 into the inner cylinder 504 through the liquid outlet pipe 107, and remixing the filtrate with the concentrated solution, wherein most ammonia nitrogen and total nitrogen in the mixed solution are removed by the anaerobic ammonia oxidation treatment device 3, so that only non-biodegradable COD and other substances are left; the power pump 502 and the valve IV 503 are opened, the mixed solution is led into the oxidation strengthening treatment device 6 for biochemical strengthening treatment, ammonia nitrogen and total nitrogen in COD and water are further removed, the treated percolate reaches the national specified emission standard, the above processes are solved, the influence of COD which is easy to be subjected to high concentration and difficult to be biodegraded on the denitrification process in the biological denitrification technology using anaerobic ammonia oxidation equipment is solved, the interference to the anaerobic ammonia oxidation rhodochrous is reduced, and the denitrification efficiency can be ensured when the anaerobic ammonia oxidation rhodochrous has the advantages of low carbon, energy saving and denitrification.
The working principle of the invention is as follows: preprocessing old landfill leachate in the middle cylinder 101 to separate filtrate containing high-concentration ammonia nitrogen components, temporarily storing the separated filtrate in the filter cylinder 105, and compressing organic matters which are difficult to biodegrade and other suspended and colloidal impurities in the concentrated solution; opening a valve III 111 to lead the filtrate in each sub-filter cylinder 105 into the anaerobic ammonia oxidation treatment device 3 for anaerobic ammonia oxidation treatment, removing high-concentration ammonia nitrogen in the filtrate, leading the filtrate after anaerobic ammonia oxidation denitrification treatment into the inner cylinder 504 through the leading-out pipe 4, leading the concentrated solution which is originally positioned in the middle cylinder 101 into the inner cylinder 504 through the liquid outlet pipe 107, and remixing the filtrate with the concentrated solution, wherein most ammonia nitrogen and total nitrogen in the mixed solution are removed by the anaerobic ammonia oxidation treatment device 3, so that only non-biodegradable COD and other substances are left; and (3) opening the power pump 502 and the valve IV 503, introducing the mixed solution into the oxidation strengthening treatment device 6 for biochemical strengthening treatment, and further removing ammonia nitrogen and total nitrogen in COD and water, so that the treated percolate reaches the national specified discharge standard.
Embodiment two:
referring to fig. 4, a transition barrel 102 is integrally and fixedly arranged at the top of a middle barrel 101, a liquid inlet pipe 103 for introducing landfill leachate is fixedly connected to the top end of the transition barrel 102, and a valve I104 for controlling the circulation inside the liquid inlet pipe 103 is arranged at one end of the liquid inlet pipe 103; the top of each sub-filter cylinder 105 is fixedly connected with a booster pipe 112, a piston 113 is movably arranged at the top end of the inside of each booster pipe 112, a spring 114 is arranged inside each booster pipe 112 and below each piston 113, the top end of each booster pipe 112 is fixedly connected with a branch pipe 115, and the tail ends of the branch pipes 115 are connected with the liquid inlet pipe 103 in an inclined tee way; the height dimension of the middle cylinder 101 is larger than that of the sub-cylinder 105, and the volume of the internal space of the pressurizing pipe 112 is larger than that of the whole branch pipe 115.
According to the above structure, in the self-cleaning operation of the nanofiltration membrane 106, the valve III 111 is closed, when the liquid level of the filtrate in the filtration cartridge 105 to be separated reaches a certain height, the valve I104 is closed, at this time, the landfill leachate injected from the liquid inlet pipe 103 will enter each branch pipe 115, at this time, the gas in each branch pipe 115 will be compressed, then the piston 113 is moved and presses the spring 114 under the driving of the air pressure and the hydraulic pressure, the air in the original pressurization pipe 112 will be pressed into the filtration cartridge 105, because the valve III 111 is closed, the air pressure in the filtration cartridge 105 is raised, the filtrate in the filtration cartridge 105 will be caused to reversely pass through the nanofiltration membrane 106 and return to the middle-placed cartridge 101, in the process that the filtrate reversely passes through the nanofiltration membrane 106, the particles originally blocked in the gap of the nanofiltration membrane 106 will be washed out, thereby achieving the self-cleaning effect of the nanofiltration membrane 106, in this way, the cleaning operation of the nanofiltration membrane 106 is realized, the functions of the equipment are increased, and the equipment is ensured to be regularly used for a long time, the operation of cleaning the nanofiltration membrane 106 is ensured, in addition, when the valve III 111 is not needed, the additional electric power is not needed, the filtration membrane 106 is completely cleaned, and the equipment is completely is removed, and the filtration membrane 106 is completely cleaned by the filtration equipment by means of the filtration equipment, and the filtration equipment is simultaneously, and the filtration equipment is completely closed by closing by the valve III.
The working principle of the invention is as follows: in the self-cleaning operation of the nanofiltration membrane 106, the valve III 111 is closed, when the liquid level of the filtrate in the filtration cartridge 105 reaches a certain height, the valve I104 is closed, at this time, the landfill leachate injected from the liquid inlet pipe 103 enters into each branch pipe 115, at this time, the gas in each branch pipe 115 is compressed, then the piston 113 is moved and presses the spring 114 under the driving of the air pressure and the hydraulic pressure, the air in the original pressurizing pipe 112 is pressed into the filtration cartridge 105, and the air pressure in the filtration cartridge 105 is raised due to the closing of the valve III 111, so that the filtrate in the filtration cartridge 105 reversely passes through the nanofiltration membrane 106 and returns to the middle-arranged cartridge 101, and the particles originally blocked in the gaps of the nanofiltration membrane 106 are flushed out in the process that the filtrate reversely passes through the nanofiltration membrane 106, thereby achieving the self-cleaning effect of the nanofiltration membrane 106.
Embodiment III:
referring to fig. 5-6, a separation assisting component 2 for accelerating separation of filtrate containing ammonia and nitrogen is assembled in the separation assisting component 2, the separation assisting component 2 comprises a penetrating rod 201 which is movably connected with a middle cylinder 101 in a plugging manner, an air cylinder 202 for controlling the penetrating rod 201 to move up and down is installed on the outer wall of the middle cylinder 101, an inner frame 203 is fixedly installed at the tail end of the penetrating rod 201 and located in the middle cylinder 101, an assisting disc 204 is rotatably assembled at the bottom of the inner frame 203, through holes 205 are formed in an annular array on the edge of the assisting disc 204, hollow pipes are arranged on the lower surface of the assisting disc 204 and correspond to the positions of the through holes 205, baffle plates 206 are fixedly arranged in the through holes 205, an inner ring plate 207 is movably installed in the hollow pipes, a hanging frame 208 for hanging the baffle plates 206 is arranged on the surface edge of the inner ring plate 207, a sloping support plate 209 is fixedly connected to the bottom of the hollow pipe, a stirring rod 210 for stirring is fixedly connected to the edge of the lower surface of the assisting disc 204, the inner diameter of the inner ring plate 207 is smaller than the diameter of the baffle plates 206, and the sloping support plate 209 and the stirring rod 210 are arranged alternately.
According to the above structure, after a certain volume of landfill leachate is injected into the middle cylinder 101, the injection process is stopped, and meanwhile, the cylinder 202 is started to drive the booster disc 204 to reciprocate, in the process that the booster disc 204 descends, the inner ring plate 207 is attached to the baffle plate 206, so that each through hole 205 is blocked, the booster disc 204 can give downward pressure to the landfill leachate, the filtration work is accelerated, in the process that the booster disc 204 ascends, the inner ring plate 207 is far away from the baffle plate 206, the through holes 205 are dredged, at this moment, in the process that the landfill leachate passes through the through holes 205, a certain pressure is given to the inclined bearing plate 209 and drives the booster disc 204 to rotate, the booster disc 204 is matched with the stirring rod 210, the stirring effect can be realized, thereby stirring the landfill leachate at other positions to the nanofiltration membrane 106, the separation booster assembly 2 is separated, in the process that the booster disc 204 reciprocates to reciprocate, the filtration speed of the landfill leachate at different positions can be accelerated, the landfill leachate can be driven to be continuously close to the nanofiltration membrane 106, the landfill leachate can be fully contacted with the nanofiltration membrane 106, and the filtration efficiency of the landfill leachate can be indirectly improved.
The working principle of the invention is as follows: after a certain volume of landfill leachate is injected into the middle cylinder 101, the injection process is stopped, and meanwhile, the cylinder 202 is started to drive the power-assisted disc 204 to reciprocate, in the descending process of the power-assisted disc 204, the inner ring plate 207 is attached to the baffle plate 206 to cause each through hole 205 to be blocked, so that the power-assisted disc 204 can give downward pressure to the landfill leachate, the filtering work is quickened, in the ascending process of the power-assisted disc 204, the inner ring plate 207 is far away from the baffle plate 206 to dredge the through holes 205, at the moment, in the process of the landfill leachate passing through the through holes 205, certain pressure is given to the inclined bearing plate 209 and the power-assisted disc 204 is driven to rotate, the power-assisted disc 204 is matched with the stirring rod 210 to achieve the stirring effect, and therefore the landfill leachate at other positions is stirred to the nanofiltration membrane 106.
Embodiment four:
referring to fig. 3 and 7, the outer ring tube 401 is fixedly connected to the end of the delivery tube 4, and the outer ring tube 401 is fixedly installed outside the mixing drum 5, the inclined tube 402 is fixedly connected to the inner side of the outer ring tube 401 in an annular array, the inner cylinder 504 is integrally and fixedly arranged inside the mixing drum 5, and the end of the inclined tube 402 is obliquely inserted into the inner cylinder 504.
According to the above structure, since the end of the inclined inlet pipe 402 is inserted into the inner cylinder 504 in an inclined manner, a certain flow effect is generated between the filtrate and the concentrated solution in the mixing cylinder 5 after the filtrate enters the inner cylinder 504, and the internal mixed solution will generate a vortex-like flow process under the impact of tangential water flow, so as to improve the mixing effect of the filtrate and the concentrated solution.
Referring to fig. 7 to 8, an outer guide frame 505 is fixedly installed at the edge of the mixing drum 5 in an annular array, a climbing machine 510 is slidably assembled at the inner side of the outer guide frame 505, magnets 509 are fixedly installed at the inner side of the climbing machine 510, an inner guide frame 506 is fixedly arranged at the inner wall of the inner drum 504 and at a position close to the outer guide frame 505, an inner net frame 507 is assembled at the inner lifting type of the inner drum 504, an end metal sliding block 508 is fixedly installed at the edge of the inner net frame 507 in an annular array, and the end metal sliding block 508 is slidably installed at the inner portion of the inner guide frame 506.
Referring to fig. 7-8, a turbine blade frame 512 is rotatably assembled on the upper surface of the inner net frame 507, blades with inclined angles are fixedly arranged on the inner side of the turbine blade frame 512 in an annular array manner, a bottom disc 513 is fixedly arranged on the lower surface of the center of the turbine blade frame 512, the bottom disc 513 is arranged below the center of the inner net frame 507, a limit stop 511 is fixedly arranged on the center of the inner net frame 507 in an annular array manner, and a protrusion 514 is fixedly arranged on the outer wall of the edge of the bottom disc 513 in an annular array manner.
According to the above structure, after the filtrate and the concentrated solution are mixed in the mixing drum 5, the carbon source is added simultaneously to achieve the denitrification effect, at this time, the mixed solution will generate a certain sludge in the reaction, in order not to affect the effect of the power pump 502 for pumping out the mixed solution, at this time, each climbing machine 510 is started to enable the magnet 509 to climb along the outer guide frame 505, under the effect of magnetic force, the inner guide frame 506 will also climb inside the inner cylinder 504 simultaneously, the end metal slide block 508 will slide upwards inside the corresponding inner guide frame 506, in the process that the inner net frame 507 and the inner net frame 512 move upwards together, the mixed solution will squeeze the paddle to a certain pressure, so that the turbine leaf frame 512 and the inner net frame 507 will simultaneously rotate relatively, and the bump 514 will be blocked by the limit stop 511, so that the turbine leaf frame 512 can only rotate a short distance in the process of climbing, at this time, the paddles in the turbine leaf frame 512 will block the gaps of the inner net frame 507, so that the inner net frame 507 can drive more sludge to move upwards during climbing, and the problem of sludge deposition is solved, and the work load of the power pump 502 is reduced due to sludge deposition.
The working principle of the invention is as follows: when filtrate and concentrated solution are mixed in the mixing drum 5, a carbon source is added simultaneously to achieve a denitrification effect, at the moment, the mixed solution can generate certain sludge in the reaction, in order not to influence the effect of pumping the mixed solution by the power pump 502, at the moment, each climbing machine 510 is started to enable the magnet 509 to climb along the outer guide frame 505, under the action of magnetic force, the inner guide frame 506 also climbs inside the inner cylinder body 504 simultaneously, the end metal sliding block 508 can slide upwards inside the corresponding inner guide frame 506, in the process that the inner net frame 507 and the inner net frame 512 move upwards together, the mixed solution can squeeze the paddles to have certain pressure, so that relative rotation can occur between the inner net frame 507 and the turbine frame 512 simultaneously, and the protrusions 514 can be blocked by the limit stop blocks 511, so that the turbine frame 512 can only rotate a small distance in the climbing process, and at the moment, the paddles in the turbine frame 512 can block gaps of the inner net frame 507, so that more sludge can be driven to move upwards during climbing, and the problem of sludge deposition is solved.
The aged garbage leachate treatment method uses the aged garbage leachate treatment device, and comprises the following specific steps:
s1: preprocessing old landfill leachate in the middle cylinder 101 to separate filtrate containing high-concentration ammonia nitrogen components, temporarily storing the separated filtrate in the filter cylinder 105, and compressing organic matters which are difficult to biodegrade and other suspended and colloidal impurities in the concentrated solution;
s2: after a certain volume of landfill leachate is injected into the middle cylinder 101, the injection process is stopped, and meanwhile, the cylinder 202 is started to drive the booster disc 204 to reciprocate, and in the process of descending of the booster disc 204, each through hole 205 is blocked by the inner ring plate 207, so that the booster disc 204 can give downward pressure to the landfill leachate, the filtration work is quickened, in the process of ascending of the booster disc 204, the through holes 205 are dredged, and in the process of penetrating through the through holes 205, the landfill leachate can give a certain pressure to the inclined bearing plate 209 and drive the booster disc 204 to rotate, and the stirring rod 210 is matched to achieve the stirring effect, so that the landfill leachate at other positions is stirred to the nanofiltration membrane 106;
s3: the nanofiltration membrane filtrate contains high-concentration ammonia nitrogen, and other impurities are low in content, and an efficient anaerobic ammonia oxidation treatment device can be adopted to remove ammonia nitrogen and total nitrogen in water, wherein a valve III 111 is opened to lead the filtrate in each sub-filter cartridge 105 into the anaerobic ammonia oxidation treatment device 3 for anaerobic ammonia oxidation treatment;
s4: the filtrate after anaerobic ammonia oxidation denitrification treatment is led into the inner cylinder 504 through the lead-out pipe 4, the concentrated solution which is originally positioned in the middle cylinder 101 is also led into the inner cylinder 504 through the liquid outlet pipe 107, at the moment, the filtrate and the concentrated solution are mixed again, at the moment, most ammonia nitrogen and total nitrogen in the mixed solution are removed by the anaerobic ammonia oxidation treatment device 3, so that only the non-biodegradable COD and other substances are left;
s5: and (3) opening the power pump 502 and the valve IV 503, introducing the mixed solution into the oxidation strengthening treatment device 6 for biochemical strengthening treatment, and further removing ammonia nitrogen and total nitrogen in COD and water, so that the treated percolate reaches the national specified discharge standard.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention. Structures, devices and methods of operation not specifically described and illustrated herein, unless otherwise indicated and limited, are implemented according to conventional means in the art.
Claims (10)
1. An aged landfill leachate treatment device which is characterized in that: the device comprises a sub-filtering device (1), a delivery pipe (4), a mixing drum (5) and an oxidation strengthening treatment device (6), wherein the sub-filtering device (1) comprises a central-placed drum (101) and sub-filtering drums (105) which are arranged on the outer wall of the central-placed drum (101) in an annular array manner, the sub-filtering drums (105) are communicated with the central-placed drum (101) and are used for collecting filtrate containing high-concentration ammonia nitrogen components separated from landfill leachate, and nanofiltration membranes (106) used for separating ammonia nitrogen filtrate are embedded between the central-placed drum (101) and the sub-filtering drums (105);
all the filter cartridges (105) are connected with a bottom ring pipe (109) through a bottom pipeline, one end of the bottom ring pipe (109) is connected with a liquid separating pipe (110) connected with the inlet of the anaerobic ammonia oxidation treatment device (3), and a valve III (111) for controlling the internal circulation of the liquid separating pipe (110) is fixedly arranged in the middle of the liquid separating pipe (110); the bottom of the middle-arranged barrel (101) is connected with a liquid outlet pipe (107) connected with the top of the mixing barrel (5), one end of the liquid outlet pipe (107) is fixedly provided with a valve II (108) for controlling the circulation inside the liquid outlet pipe (107), the output end of the anaerobic ammonia oxidation treatment device (3) is connected with a delivery pipe (4) for guiding filtrate subjected to anaerobic ammonia oxidation treatment into the mixing barrel (5), one side of the bottom of the mixing barrel (5) is connected with a mixed liquid outlet pipe (501) for guiding mixed liquid into the oxidation strengthening treatment device (6), and two ends of the mixed liquid outlet pipe (501) are provided with a power pump (502) for pumping mixed liquid and a valve IV (503) for controlling the circulation inside the mixed liquid outlet pipe (501);
a transition barrel (102) is integrally and fixedly arranged at the top of the middle barrel (101), a liquid inlet pipe (103) for guiding garbage percolate is fixedly connected to the top end of the transition barrel (102), and a valve I (104) for controlling the circulation inside the liquid inlet pipe (103) is arranged at one end of the liquid inlet pipe (103); the top of each filter cylinder (105) is fixedly connected with a pressurizing pipe (112), a piston (113) is movably arranged at the top end of the inside of each pressurizing pipe (112), a spring (114) is arranged inside each pressurizing pipe (112) and below each piston (113), a branch pipe (115) is fixedly connected at the top end of each pressurizing pipe (112), and the tail ends of the branch pipes (115) are connected with a liquid inlet pipe (103) in an inclined tee way;
the utility model discloses a separation assistance subassembly (2) that divides filter equipment (1)'s inside equipment to have is used for accelerating separation to contain ammonia nitrogen filtrate, separation assistance subassembly (2) include with put section of thick bamboo (101) and constitute movable spliced relation wear pole (201), put the outer wall of section of thick bamboo (101) and install cylinder (202) that are used for controlling to wear pole (201) lift removal, the end of wearing pole (201) and being located in put section of thick bamboo (101) inside fixed mounting jointly have inner frame (203), just the bottom of inner frame (203) rotates and sets up helping hand dish (204), through-hole (205) have been seted up to the edge annular array of helping hand dish (204), just helping hand dish (204) lower surface and the position department that corresponds through-hole (205) all are provided with the blank pipe, the inside of through-hole (205) all is fixed be provided with baffle plate (206), and the inside movable mounting of blank pipe has inner ring plate (207), the surface edge of inner ring plate (207) is provided with hanger (208) that are used for hanging baffle plate (206), the bottom of blank pipe all is fixedly connected with inclined support plate (209), and stirring edge (210) are used for stirring and evenly connect the surface of stirring dish (210).
2. The aged landfill leachate treatment device according to claim 1, wherein: the height dimension of the middle cylinder (101) is larger than that of the sub-filter cylinder (105), and the volume of the inner space of the pressurizing pipe (112) is larger than that of the whole branch pipe (115).
3. The aged landfill leachate treatment device according to claim 1, wherein: the inner diameter size of the inner ring plate (207) is smaller than the diameter size of the baffle plate (206), and the inclined bearing plates (209) and the stirring rod (210) are arranged at intervals.
4. The aged landfill leachate treatment device according to claim 1, wherein: the tail end of the delivery pipe (4) is fixedly connected with an outer ring pipe (401), the outer ring pipe (401) is fixedly arranged outside the mixing drum (5), and the inner side of the outer ring pipe (401) is fixedly connected with an inclined inlet pipe (402) in an annular array mode.
5. The aged refuse leachate treatment device according to claim 4, wherein: an inner cylinder body (504) is integrally and fixedly arranged in the mixing cylinder (5), and the tail end of the inclined inlet pipe (402) is obliquely inserted into the inner cylinder body (504).
6. The aged refuse leachate treatment device according to claim 5, characterized in that: the edge annular array type mixing drum (5) is fixedly provided with an outer guide frame (505), the inner sides of the outer guide frames (505) are respectively and slidably assembled with a climbing machine (510), and the inner sides of the climbing machines (510) are respectively and fixedly provided with a magnet (509).
7. The aged refuse leachate treatment device according to claim 6, characterized in that: the inner wall of the inner cylinder body (504) and the position close to the outer guide frame (505) are fixedly provided with inner guide frames (506), an inner net frame (507) is assembled in the inner lifting type of the inner cylinder body (504), end metal sliding blocks (508) are fixedly arranged on the edge of the inner net frame (507) in an annular array mode, and the end metal sliding blocks (508) are slidably arranged in the inner guide frames (506).
8. The aged refuse leachate treatment device according to claim 7, wherein: the inner net rack (507) is characterized in that a turbine blade rack (512) is rotatably assembled on the upper surface of the inner net rack (507), and blades with inclination angles are fixedly arranged on the inner side of the turbine blade rack (512) in an annular array mode.
9. The aged landfill leachate treatment device according to claim 8, wherein: the lower surface of the center of the turbine blade frame (512) is fixedly provided with a bottom disc (513), the bottom disc (513) is arranged below the center of the inner net frame (507), the annular array of the center of the inner net frame (507) is fixedly provided with a limit stop (511), and the outer wall of the edge of the bottom disc (513) is fixedly provided with a protrusion (514).
10. A method for treating aged landfill leachate, which uses the aged landfill leachate treatment device according to any one of claims 1 to 9, and is characterized by comprising the following specific steps:
s1: firstly, preprocessing old landfill leachate in a middle-placed barrel (101) to separate filtrate containing high-concentration ammonia nitrogen components, temporarily storing the separated filtrate in a filter barrel (105), and compressing organic matters which are difficult to biodegrade and other suspended and colloidal impurities in concentrated liquid;
s2: after a certain volume of landfill leachate is injected into the middle cylinder (101), the injection process is stopped, and meanwhile, the cylinder (202) is started to drive the booster disc (204) to reciprocate, in the descending process of the booster disc (204), each through hole (205) is blocked by the inner ring plate (207), so that the booster disc (204) can give downward pressure to the landfill leachate to accelerate the filtration work, in the ascending process of the booster disc (204), the through holes (205) are dredged, and in the penetrating process of the booster disc (204), the landfill leachate can give a certain pressure to the inclined bearing plate (209) and drive the booster disc (204) to rotate, and the stirring effect is realized by matching with the stirring rod (210), so that the landfill leachate at other positions is stirred to the nanofiltration membrane (106);
s3: the nanofiltration membrane filtrate contains high-concentration ammonia nitrogen, and other impurities are low in content, and an efficient anaerobic ammonia oxidation treatment device can be adopted to remove ammonia nitrogen and total nitrogen in water, wherein a valve III (111) is opened to lead filtrate in each sub-filter cartridge (105) into the anaerobic ammonia oxidation treatment device (3) for anaerobic ammonia oxidation treatment;
s4: the filtrate after anaerobic ammonia oxidation denitrification treatment is led into the inner cylinder body (504) through the delivery pipe (4), the concentrated solution which is originally positioned in the middle cylinder (101) is also led into the inner cylinder body (504) through the delivery pipe (107), at the moment, the filtrate and the concentrated solution are remixed, and at the moment, most ammonia nitrogen and total nitrogen in the mixed solution are removed by the anaerobic ammonia oxidation treatment device (3), so that only non-biodegradable COD and other substances are left;
s5: and (3) opening a power pump (502) and a valve IV (503), introducing the mixed solution into an oxidation strengthening treatment device (6) for biochemical strengthening treatment, and further removing ammonia nitrogen and total nitrogen in COD and water, so that the treated percolate reaches the national specified discharge standard.
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