CN102786183A - Method for processing garbage leachate - Google Patents

Method for processing garbage leachate Download PDF

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Publication number
CN102786183A
CN102786183A CN2012100865958A CN201210086595A CN102786183A CN 102786183 A CN102786183 A CN 102786183A CN 2012100865958 A CN2012100865958 A CN 2012100865958A CN 201210086595 A CN201210086595 A CN 201210086595A CN 102786183 A CN102786183 A CN 102786183A
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percolate
electrolysis
membrane
treatment
pond
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CN102786183B (en
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张世文
李丹
殷明彩
秦婧
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Boying Xiamen Science and Technology Co Ltd
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Boying Xiamen Science and Technology Co Ltd
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Priority to PCT/CN2013/076203 priority patent/WO2013143506A1/en
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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
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • 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
    • C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
    • 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
    • C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
    • 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
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
    • C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
    • 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
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
    • C02F1/4691—Capacitive deionisation
    • 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
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
    • C02F1/5254—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using magnesium compounds and phosphoric acid for removing ammonia
    • 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
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
    • C02F1/56—Macromolecular compounds
    • 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
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • 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
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/1236—Particular type of activated sludge installations
    • C02F3/1268—Membrane bioreactor systems
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/124—Water desalination
    • Y02A20/131—Reverse-osmosis
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)

Abstract

The invention discloses a method for processing a landfill leachate, which comprises the following steps of ammonia nitrogen removal, flocculent precipitate, electrolysis, capacitance desalination, anaerobic treatment, aerobic treatment, membrane filtration and membrane concentrate treatment. The method for processing the landfill leachate has the advantages that an electrolysis technology, a membrane technology and a bio-chemical technology are combined to form a method for processing the landfill leachate, the method has the characteristics of stable operation, strong adaptive capacity on water quality change, low cost, high treatment efficiency, effective reduction of index of ammonia nitrogen, COD, SS, chromaticity in the landfill leachate and standard discharge of effluent.

Description

Rubbish leachate treatment method
Technical field
The invention belongs to field of environment engineering, it relates to a kind of treatment process of sewage, is meant especially that a kind of cost is lower, effect rubbish leachate treatment method preferably.
Background technology
Percolate is a kind of high concentration organic percolate that is difficult to handle, and it is mainly from following three aspects: 1, natural precipitation and the runoff in the landfill yard; 2, the water that contains of rubbish self; 3, the water that behind garbage loading embeading, produces owing to the anaerobic digestion of mikrobe; Wherein the precipitation in the landfill yard is major portion.City garbage percolate pollutant load representative value is shown in table 1.
The staple (except that pH and sense index, unit is mg/L) of the general percolate of table 1
Project The concentration change scope Project The concentration change scope
Sense index Black/stench Muriate 189～3262
The pH value 3.7～8.5 Fe 50～600
Total hardness 3000～10000 Cu 0.1～1.43
COD Cr 1200～300000 Ca 200～300
BOD 5 200～60000 Pb 0.1～2.0
NH3-N 20～7400 Cr 0.01～2.61
Total phosphorus 1～70 Hg 0～0.032
Can know that by table 1 water quality of percolate has following essential characteristic:
(1) Pollutant levels are high, and COD, BOD and ammonia nitrogen are more than tens～hundred times of industrial pollutants discharging standards mostly.
(2) existing organic contamination composition also has inorganic pollutant component, also contains some micro heavy pollutant components simultaneously, and the comprehensive pollution characteristic is obvious.
(3) organic pollutant category is many, complicated component.Organic pollutant is many in the percolate, up to 77 kinds, non-chlorination aromatics, chlorination aromatic series things such as being difficult to biodegradable naphthalene, phenanthrene is arranged wherein, SULPHOSUCCINIC ACID ESTER, phthalic ester, phenolic cpd and amino benzenes compounds etc.
(4) contain more than 10 kind of metals ion in the percolate, heavy metal ion wherein can produce the severe inhibition effect to biological treatment process.
(5) the microbial nutrition element ratio is seriously lacked of proper care in the percolate.Ammonia nitrogen concentration wherein is very high, and C/N is out of proportion, and the needed nutritive props of microorganism growth greatly differed from each other when its nutritive props was handled than biological process, brought certain degree of difficulty to biological treatment.
The ammonia-nitrogen content of percolate and COD concentration are high, make the surface water body anoxic, water quality deterioration; Nutritive substances such as nitrogen phosphorus are the inducements that causes body eutrophication, also possibly have a strong impact on drinking water source; Generally speaking, COD, BOD, BOD/COD can increase with landfill yard " age " and reduce, and level of alkalinity then raises.In addition, along with the increase of stacking the time limit, new refuse gradually becomes old rubbish, and organic content descends to some extent in the percolate, but the ammonia-nitrogen content increase, and the biodegradability reduction, so intractability is very big.
The emphasis that percolate is administered is COD and treatment of ammonia nitrogen, especially treatment of ammonia nitrogen.Multiple technology and the equipment that percolate is handled of being used for has appearred in the prior art.A kind of treatment process that utilizes the submerged combustion evaporation technology to come the landfill waste percolate is for example just disclosed in patent document CN1485280A; This technology mainly is through oxidation operation being become carbonic acid gas and water, and handles penetrating fluid through evaporation and spissated mode.The technology of utilizing anaerobism molecular breakdown method to come the treating refuse percolate is then disclosed in patent document CN1440941; This method comprises predecomposition step, anaerobism step, decomposing oxidation step, adsorption step, step of flocculation precipitation and filtration step, and this method has combined the means of the physical chemistry processing and two aspects of carrying out a biological disposal upon.Similarly, disclosed percolate adopts electrolytic oxidation to handle the scheme that combines with film among the patent document CN1478737, in this technology, carries out reverse-osmosis treated again after the percolate that utilizes ceramic membrane that the process electrolytic oxidation is handled filters.
In addition; Existing known electrolysis tech can effectively be removed the objectionable impurities in the percolate; But traditional electrolytic current density is low, operating potential is high, electrical efficiency is very low, the power consumption big, the life-span is short, cost is high, and it is unsatisfactory therefore to be applied to percolate processing aspect effect.
Summary of the invention
The objective of the invention is to overcome complex treatment process that prior art exists, the chemical consumption amount is big, cost is high, handle defectives such as back percolate discharging is not up to standard; Organically combine through electrolysis process, membrane process and biochemical process; Learn from other's strong points to offset one's weaknesses, thereby form a kind of high ammonia nitrogen removal frank, high chroma clearance and high COD clearance, stable, strong, expense is lower, processing efficiency is high garbage filter liquid processing method the change of water quality adaptive faculty.
Technical scheme of the present invention may further comprise the steps:
A, ammonia nitrogen removal
Percolate gets into equalizing tank through pipeline and regulates water quality; The balanced water yield; And in equalizing tank, add the pH regulator agent through chemicals dosing plant; Regulate in pH value back inflow ammonia-nitrogen desorption device or the reaction tank, in the ammonia-nitrogen desorption device, make ammonia nitrogen in high density in the percolate convert free ammonia to and be blown, perhaps in reaction tank, add an amount of Mg (OH) through chemicals dosing plant through steam or air stripping 2And H 3PO 4, with NH 4+Reaction generates MgNH 4PO 46H 2O (struvite) deposition to reach the purpose of removing ammonia nitrogen, gets into the subsequent disposal operation after making its ammonia nitrogen concentration≤200mg/L;
B, flocculation sediment
Flow into coagulation basin behind the percolate ammonia nitrogen removal; In coagulation basin, add an amount of flocculation agent through chemicals dosing plant; Back entering preliminary sedimentation tank reacts completely; The throw out of preliminary sedimentation tank (being mud) is sent in the sludge sump through pump and pipeline, in sludge dehydration device, carries out filtering separation at last, with the COD reduction by 10～35% of percolate;
C, electrolysis
Percolate after the flocculation sediment processing is pumped into the electrolysis machine electrolysis, pond in the middle of getting into after the electrolysis, and add reductive agent, remove the remaining radical that electrolysis produces; Adjacent two interelectrode voltages of electrolysis machine are 2～12V, and current density is 10～320mA/cm 2
D, electric capacity desalination
During the specific conductivity of percolate after through step c electrolysis treatment >=5000 μ s/cm, through steps d electric capacity desalting treatment, make its specific conductivity be reduced to 500～3000 μ s/cm earlier, get into step e anaerobic treatment then; During the specific conductivity of percolate after through step c electrolysis treatment＜5000 μ s/cm, directly get into step e anaerobic treatment;
E, anaerobic treatment
Percolate after electrolysis treatment or the electric capacity desalting treatment gets in hydrolysis acidification pool and the anoxic pond successively; The residence time is 8～72 hours; Larger molecular organics in hydrolysis acidification pool in percolate acidication under the effect of acid-producing bacteria becomes small organic molecule; Resolve into methane and carbonic acid gas under the absorption of anerobes, the oxygen bacterium of holding concurrently, fermentation, the acting in conjunction of product methane in the process anoxic pond again, improve the B/C value, improve biodegradability; Denitrification through denitrifying bacterium in the anoxic pond simultaneously further removes the ammonia nitrogen in the percolate;
F, aerobic treatment
Percolate after the anaerobic treatment gets into and contains in the Aerobic Pond of mikrobes such as aerobic bacteria, nitrobacteria and nitrite bacteria; The residence time is 16～360 hours; Make good use of the organism in the further oxygenolysis percolate of oxygen animalcule; The degree of depth is removed COD and the BOD in the percolate, utilizes the nitrification of nitrobacteria and the nitrosification of nitrite bacteria to make ammonia-state nitrogen be converted into nitric nitrogen or nitrite nitrogen simultaneously; In addition, the partially mixed liquid of Aerobic Pond is back to anoxic pond through reflux pump;
G, re-electrolysis
When through the COD of the percolate after the aerobic treatment>=400mg/L; The percolate that will pass through after the aerobic treatment carries out re-electrolysis; Make wherein larger molecular organics open loop chain rupture, improve biodegradability, and during electrolysis; Adjacent two interelectrode voltages of electrolysis machine are 3～18V, and current density is 20～320mA/cm 2When through the COD of the percolate after the aerobic treatment＜400mg/L, then directly get into step h membrane filtration;
H, membrane filtration
Percolate after Aerobic Process for Treatment or re-electrolysis are handled flows into second pond; Behind further COD, BOD and the SS that removes in the percolate of precipitation, make water outlet reach the recycled water standard through membrane filtration, the mud part of second pond bottom flow in the anoxic pond through blowback; Another part flows in the sludge-tank by pipeline; Become filtrating and mud cake through the sludge dehydration device isolated by filtration again, filtrating is back in the regulating reservoir through pipeline, and mud cake is then transported outward;
I, film filtration concentrated processing
After the liquid concentrator process electric capacity desalting treatment that step h membrane filtration produces, be circulated to anoxic pond through blowback stream again.
In step a, said ammonia-nitrogen desorption device is a kind of of stripping tower, packing tower or gravity machine; The ammonia that said stripping goes out can be back to soda ash production with hydrochloric acid absorption generation ammonium chloride and make mother liquor, and also used water absorbs and produces ammoniacal liquor or produce the ammonium sulfate sub product with sulfuric acid absorption;
In step a, said MgNH 4PO 46H 2O (struvite) throw out can be developed as composite fertilizer and use after processes such as granulation.
In step b, said flocculation agent is aluminium salt (Tai-Ace S 150, aluminum chloride), molysite (ferric sulfate, ferrous sulfate, iron(ic)chloride), gather aluminium (Poly aluminum Chloride (PAC), polyaluminium sulfate, polymer aluminium silicate), a kind of or any combination more than two kinds in gather iron (poly-ferric chloride, bodied ferric sulfate, polymeric silicicacid iron), organic polymer coargulator or the microbial flocculant; Said pH regulator agent is a kind of in sulfuric acid, hydrochloric acid, sodium hydroxide, yellow soda ash, sodium hydrogencarbonate, the lime.
In step b, optimum flocculent is bodied ferric sulfate (PFS), and its dosage is percolate 200～2000g per ton.
In step b, optimum flocculent is ferrous sulfate (FeSO 4), its dosage is percolate 230～1800g per ton.
In step c, said electrolysis machine is provided with power supply and electrolyzer, and the electrode materials in the electrolyzer is a kind of in alloy and the nano-catalytic noble electrode of graphite, titanium, iron, aluminium, zinc, copper, lead, nickel, molybdenum, chromium, metal etc.; The top layer of said nano-catalytic noble electrode is coated with the MOX inertia catalyst coatings that crystal grain is 10～35nm; The substrate of said nano-catalytic noble electrode can be titanium plate or plastic plate.
Further, in step c, described best electrolysis is the nano-catalytic electrolysis; The structure of described nano-catalytic electrolysis machine is seen Chinese patent CN102010038A; Electrolytic WV is 2～500V, and adjacent two interelectrode voltages are 2～8 V, and current density is 10～300mA/cm 2
During nano-catalytic electrolysis percolate; The radical chlorine [Cl], radical oxygen [O] and the hydroxyl strong oxidizing property materials such as [OH] that produce are killed organism, ammonium ion in mikrobe in the percolate, the oxygenolysis percolate, make the big ring open loop of organic substance in the percolate, the long-chain chain rupture; Both eliminated the colourity of percolate; Also removed stink, also improved the biodegradability of percolate, and percolate is taken off under electric field action surely; Suspended substance in the percolate, colloid, charged corpuscle form larger particles.In addition, the positively charged ion in the percolate, negatively charged ion move to negative electrode and anode respectively, in negative electrode and anode generation Effect of Electric Double Layer and the effect of many electricity layers, form deposition and bring out throwing out, accelerating impurity sedimentation; The hydrogen small bubbles that electrolysis produces also have air flotation effect.
Adopt the nano-catalytic electrolysis to have following outstanding effect:
At first, make the macrocylc compound open loop in the percolate, long-chain chain rupture through electrolysis; The radical oxygenolysis organism that produces; Reduce COD fast, improved the biodegradability of percolate, thereby created better biochemical condition for follow-up anaerobic unit.
Secondly, kill the mikrobe in the percolate, make in the follow-up anaerobic treatment and can cultivate bigger dominant microflora, bring into play better biochemical effect, make the effluent quality of anaerobic treatment better through the multiple radical (strong oxidizing property material) that electrolysis produces.
The 3rd, the inorganic ammonium in the oxygenolysis percolate makes ammonium ion be converted into nitrogen, nitrate radical, nitrite anions and water, and the decreasing ratio of ammonia nitrogen can reach 80～90%, makes the ammonia nitrogen that gets into biochemical preceding percolate less than 100mg/L, eliminates stink in the water simultaneously.
The 4th; Reduce the colourity of percolate significantly; Chlorine [Cl], hydroxyl [OH] and oxygen strong oxidizing property radicals such as [O] that electrolysis produces can oxygenolysis residue in chromophoric group in the percolate, auxochrome group, reduce percolate colourity, reach the purpose of decolouring.
The 5th, deodorizing, the osmophore in multiple radical (strong oxidizing property material) the oxygenolysis percolate that electrolysis produces is removed the stench in the percolate.
The 6th; Positively charged ion during electrolysis in the percolate and negatively charged ion move to the negative electrode and the anode of electrolysis machine electrolyzer respectively; Effect of Electric Double Layer takes place; Near negative electrode and anode, form deposition, thereby reduce the heavy metal ion content in the percolate, thereby alleviate inhibition, the toxic action of heavy metal ion anaerobism, aerobic microbiological in the follow-up unit.
In step f, the reflux ratio of said mixed solution is 3:1 or 2:1, helps the ammonia nitrogen that the denitrification of denitrifying bacterium in the anoxic pond removes percolate.
In step h, said membrane filtration filters for the percolate through the second pond precipitate and separate passes through membrane bioreactor (MBR) again; Said MBR membrane module is selected from a kind of in pvdf hollow-fibre membrane, polypropylene hollow fiber membrane, ps hollow fiber uf membrane, polyethersulfone, polyacrylonitrile and the PVC hollow fiber membrane; Membrane pore size is 0.10～0.2 μ m; WP is-1～-50kPa, working temperature is 5～45 ℃.
In step h, after the percolate process immersion ultrafiltration or pillar ultra-filtration filters of said membrane filtration for process second pond precipitate and separate, filter through nanofiltration again; Said ultrafiltration is a kind of of immersion ultrafiltration, pillar ultrafiltration, tubular type ultrafiltration, rolling ultrafiltration or plate-type hyperfiltration; Molecular weight cut-off is 1000～100000MWCO; Working conditions is: normal temperature～45 ℃; The WP of immersion ultrafiltration is-1～-50kPa, the WP of pillar ultrafiltration, tubular type ultrafiltration, rolling ultrafiltration and plate-type hyperfiltration is 3～300kPa; The membrane module of said nanofiltration is a rolled membrane module, and the mould material of nf membrane is cellulose acetate film or a composite nanometer filtering film in the organic membrane, and the molecular weight cut-off of nf membrane is 200～500MWCO, and entrance pressure is 6.0～45.0bar, and going out to press is 4.5～43.5 bar.
In step h, behind the percolate process ultra-filtration filters of said membrane filtration for process second pond precipitate and separate, pass through r-o-(RO) again and filter; The membrane module of said r-o-is a rolled membrane module, and mould material is cellulose acetate film or a composite package in the organic membrane, and the molecular weight cut-off of mould material is 50～200MWCO, and entrance pressure can be 6.0～45.0bar, goes out to press to can be 4.5～35 bar.
Can know by the above-mentioned description of this invention, compare, the invention has the advantages that with prior art:
(1) passes through electrolysis step; Make non-chlorination aromatics, chlorination aromatic series things such as being difficult to biodegradable naphthalene, phenanthrene in the percolate, SULPHOSUCCINIC ACID ESTER, phthalic ester; Open loop such as phenolic cpd and amino benzenes compounds, chain rupture; Not only can reduce COD, and improve the biodegradability of percolate, the decreasing ratio to the remaining ammonia nitrogen behind the ammonia nitrogen removal can reach 80～90% simultaneously; Effectively remove heavy metal ion in the percolate through the electrolytic flocculation precipitating action simultaneously, for follow-up treatment process is created better biochemical condition.
(2) nano-catalytic electrolysis machine employing surface coverage has and has good catalytic effect crystal grain the noble electrode of the nano-catalytic coating that is 10～35nm to make anode; Anode does not consume; Cost is low; Electrical efficiency is high, is more than 10 times of ordinary electrode electrolytic efficiency, and the ton percolate is handled the electric energy that consumes and reduced significantly.
(3) bioremediation through anaerobic treatment and aerobic treatment can further effectively reduce ammonia nitrogen, COD and the BOD in the percolate.
(4) cooperate in order through above-mentioned each step and can guarantee that percolate handles back each item index and all reach " household refuse landfill sites pollution control criterion " (GB16889-2008) requirement of emission standard, for the processing of landfill percolate provides reliable assurance.
(5) through with film filtration concentrated pass through the desalination of electric capacity ionic adsorption again after, pass back into biosystem again, thoroughly solve film filtration concentrated emission problem.
Description of drawings
Fig. 1 is a process flow sheet of the present invention.
Embodiment
1 embodiment of the present invention is described with reference to the accompanying drawings.
Embodiment 1
The percolate treatment project of certain garbage sanitary filling field 1000 ton per day
The former water of described percolate is as shown in table 2 through measuring the water quality situation.
The water quality situation of the former water of table 2 percolate.
Sequence number Project Unit Measured value Sequence number Project Unit Measured value
1 COD Cr mg/L 16800 5 Ammonia nitrogen mg/L 1240
2 SS mg/L 570 6 Colourity Doubly 1200
3 Turbidity NTU 505 7 The pH value - 6.8
4 BOD 5 mg/L 2866 8 Specific conductivity μS/cm 4300
Step a, ammonia nitrogen removal
Percolate gets into equalizing tank through pipeline and regulates water quality, the balanced water yield, and feasible flow and parameter from refuse landfill percolate of different nature everywhere is able to abundant adjusting, is convenient to follow-up unitary processing.And in equalizing tank, add sodium hydroxide solution adjusting pH value to 9 ~ 11 through chemicals dosing plant, and flow into then in the reaction tank, in reaction tank, add Mg (OH) through chemicals dosing plant 2And H 3PO 4, make itself and NH 4+Reaction generates MgNH 4PO 46H 2O (struvite) deposition to reach the purpose of removing ammonia nitrogen, gets into coagulation basin after making its ammonia nitrogen concentration≤200mg/L; The struvite throw out then after processes such as granulation, use as composite fertilizer by exploitation.
Step b, flocculation sediment
Flow into coagulation basin behind the percolate ammonia nitrogen removal; After reacting completely, percolate adding 200g bodied ferric sulfate per ton (PFS) gets into preliminary sedimentation tank; The deposition of preliminary sedimentation tank (being mud) is sent in the sludge sump through pump and pipeline, in sludge dehydration device, carries out filtering separation at last; The COD of percolate is reduced by 10～35% back entering electrolysis machines.
Above-mentioned bodied ferric sulfate is a flocculation agent.Flocculation agent can be aluminium salt (Tai-Ace S 150, aluminum chloride), molysite (ferric sulfate, ferrous sulfate, iron(ic)chloride), gather aluminium (Poly aluminum Chloride (PAC), polyaluminium sulfate, polymer aluminium silicate), a kind of or any combination more than two kinds in gather iron (poly-ferric chloride, bodied ferric sulfate, polymeric silicicacid iron), organic polymer coargulator or the microbial flocculant.
Step c, electrolysis
Percolate gets into middle pond then, and adds reductive agent through flowing into the electrolysis machine electrolysis behind the flocculation sediment, removes the remaining radical that electrolysis produces.Said electrolysis machine is the nano-catalytic electrolysis machine, and its WV is 40V, and current density is 20mA/cm 2, two interpolar voltages are 3.5 V.Organic substance in the radical chlorine [Cl] of the strong oxidizing property that the little electrolysis of nano-catalytic produces, oxygen [O] and the quick oxygenolysis percolate of hydroxyl [OH] ability; Make the big organic molecule open loop, chain rupture, the macromole that are difficult to biochemical degradation in the percolate be decomposed into small molecules; Reduce COD with improve percolate can be biochemical, for biochemistry provides better condition; Make chromophoric group, the auxochrome group oxidation of the dye molecule in the percolate simultaneously or be reduced to colourless group, reach the purpose of decolouring; Moreover; Positively charged ion in the percolate and negatively charged ion move to the negative electrode and the anode of electrolysis machine electrolyzer respectively; Near negative electrode and anode, form deposition; Thereby the heavy metal ion content in the reduction percolate, thereby alleviate inhibition, the toxic action of heavy metal ion to anaerobism, aerobic microbiological in the follow-up unit; In addition, can also kill mikrobe in the percolate, and make suspended substance, colloid, charged corpuscle in the percolate under electric field action, form larger particles.
Steps d, anaerobic treatment
The specific conductivity of the percolate after the electrolysis treatment＜5000 μ s/cm; Therefore directly get in hydrolysis acidification pool and the anoxic pond; The residence time is 10 hours, and the acidication under the effect of acid-producing bacteria of the larger molecular organics in hydrolysis acidification pool in the percolate becomes small organic molecule, resolves into methane and carbonic acid gas under the absorption of anerobes, the oxygen bacterium of holding concurrently, fermentation, the acting in conjunction of product methane in the process anoxic pond again; Improve the B/C value, improve biodegradability; Denitrification through denitrifying bacterium in the anoxic pond simultaneously further removes the ammonia nitrogen in the percolate.
Step e, aerobic treatment
Percolate after the anaerobic treatment gets into and contains in the Aerobic Pond of mikrobes such as aerobic bacteria, nitrobacteria and nitrite bacteria; The residence time is 18 hours; Make good use of the organism in the further oxygenolysis percolate of oxygen animalcule; The degree of depth is removed COD and the BOD in the percolate, utilizes the nitrification of nitrobacteria and the nitrosification of nitrite bacteria to make ammonia-state nitrogen be converted into nitric nitrogen or nitrite nitrogen simultaneously; In addition, the mixed solution of Aerobic Pond is back to anoxic pond with the ratio of 2:1 through reflux pump.
Step f, membrane filtration
COD＜the 400mg/L of the percolate after the aerobic treatment flows directly into second pond, through the COD in the further removal of the deposition percolate, BOD, SS etc.; Make water outlet reach the reuse water standard through the MBR filtering separation; The mud part of second pond bottom flow in the anoxic pond through blowback, and another part flows in the sludge sump through pipeline, becomes filtrating and mud cake through the sludge dehydration device filtering separation again; Filtrating is back in the equalizing tank through pipeline, and mud cake is then transported outward.
Said MBR membrane module is a polypropylene hollow fiber membrane, and membrane pore size is 0.10～0.2 μ m, WP is-1～-50kPa, working temperature is 5～45 ℃.
G, film filtration concentrated processing
After MBR filters the liquid concentrator process electric capacity desalting treatment that produces among the step f, be circulated to anoxic pond through blowback stream again.
The effluent quality situation of the percolate after table 3 is handled
Sequence number Project Unit Measured value Sequence number Project Unit Measured value
1 COD Cr mg/L 58 5 Ammonia nitrogen mg/L ≤5
2 SS mg/L ≤5 6 Colourity Doubly 8
3 Turbidity NTU ≤5 7 The pH value - 7.2
4 BOD 5 mg/L 16 8 Specific conductivity μS/cm ≤3500
Embodiment 2
The percolate treatment project of certain garbage sanitary filling field 300 ton per day
The former water of described percolate is as shown in table 4 through testing index.
The water quality situation of the former water of table 4 percolate.
Sequence number Project Unit Measured value Sequence number Project Unit Measured value
1 COD Cr mg/L 89600 5 Ammonia nitrogen mg/L 3660
2 SS mg/L 802 6 Colourity Doubly 2500
3 Turbidity NTU 730 7 The pH value - 9.3
4 BOD 5 mg/L 17900 8 Specific conductivity μS/cm 9030
Step a, ammonia nitrogen removal
Percolate gets into equalizing tank through pipeline and regulates water quality, the balanced water yield, and feasible flow and parameter from refuse landfill percolate of different nature everywhere is able to abundant adjusting, is convenient to follow-up unitary processing.And in equalizing tank, add lime adjusting pH value to 10 ~ 11 through chemicals dosing plant; Flow in the stripping tower then; Making ammonia nitrogen in high density in the percolate convert free ammonia to through the steam stripping is blown; To reach the purpose of removing ammonia nitrogen, get into the back coagulation basin after making its ammonia nitrogen concentration≤200mg/L; The ammonia that stripping goes out then is back to soda ash production with hydrochloric acid absorption generation ammonium chloride and makes mother liquor.
Step b, flocculation sediment
Flow into coagulation basin behind the percolate ammonia nitrogen removal, percolate per ton adds 250g ferrous sulfate (FeSO 4), the back that reacts completely gets into preliminary sedimentation tank, and the deposition of preliminary sedimentation tank (being mud) is sent in the sludge sump through pump and pipeline, in sludge dehydration device, carries out filtering separation at last; The COD of percolate reduces by 10～35% backs and flows into electrolysis machine.
Above-mentioned ferrous sulfate is a flocculation agent.Flocculation agent can be aluminium salt (Tai-Ace S 150, aluminum chloride), molysite (ferric sulfate, ferrous sulfate, iron(ic)chloride), gather aluminium (Poly aluminum Chloride (PAC), polyaluminium sulfate, polymer aluminium silicate), a kind of or any combination more than two kinds in gather iron (poly-ferric chloride, bodied ferric sulfate, polymeric silicicacid iron), organic polymer coargulator or the microbial flocculant.
Step c, electrolysis
Percolate gets into middle pond, and adds reductive agent through flowing into the electrolysis machine electrolysis behind the flocculation sediment after the electrolysis, remove the remaining radical that electrolysis produces; The electrolysis machine WV is 4V, and current density is 150mA/cm 2, the voltage between two neighboring pole is 2 V.
Steps d, electric capacity desalination
The specific conductivity of percolate after the step c electrolysis treatment＞5000 μ s/cm is carried out the electric capacity desalting treatment earlier, its specific conductivity is reduced to gets into step e anaerobic treatment behind 500～3000 μ s/cm.
Step e, anaerobic treatment
Percolate after the electric capacity desalting treatment gets in hydrolysis acidification pool and the anoxic pond successively; The residence time is 36 hours; Larger molecular organics in hydrolysis acidification pool in percolate acidication under the effect of acid-producing bacteria becomes small organic molecule; Resolve into methane and carbonic acid gas under the absorption of anerobes, the oxygen bacterium of holding concurrently, fermentation, the acting in conjunction of product methane in the process anoxic pond again, improve the B/C value, improve biodegradability; Denitrification through denitrifying bacterium in the anoxic pond simultaneously further removes the ammonia nitrogen in the percolate.
Step f, aerobic treatment
Percolate after the anaerobic treatment gets into and contains in the Aerobic Pond of mikrobes such as aerobic bacteria, nitrobacteria and nitrite bacteria; The residence time is 180 hours; Make good use of the organism in the further oxygenolysis percolate of oxygen animalcule, the degree of depth is removed the COD in the percolate CrAnd BOD 5, utilize the nitrification of nitrobacteria and the nitrosification of nitrite bacteria to make ammonia-state nitrogen be converted into nitric nitrogen or nitrite nitrogen simultaneously; In addition, the mixed solution of Aerobic Pond is back to anoxic pond with the ratio of 2:1 through reflux pump.
Step g, re-electrolysis
COD>=the 400mg/L of the percolate after the aerobic treatment, therefore flowing into electrolysis machine carries out re-electrolysis, makes wherein larger molecular organics open loop chain rupture; Improve biodegradability; And during electrolysis, adjacent two interelectrode voltages of electrolysis machine are 5V, and current density is 190mA/cm 2
Step h, membrane filtration
Percolate after re-electrolysis is handled flows into second pond; Behind further COD, BOD and the SS that removes in the percolate of deposition, process immersion ultrafiltration and nanofiltration are filtered and are made water outlet reach the reuse water standard successively, and the mud part of second pond bottom flow in the anoxic pond through blowback; Another part flows in the sludge sump through pipeline; Become filtrating and mud cake through the sludge dehydration device filtering separation again, filtrating is back in the equalizing tank through pipeline, and mud cake is then transported outward.
The working conditions of said immersion ultrafiltration is: normal temperature～45 ℃, WP are-1～-50kPa; The membrane module of said nanofiltration is a rolled membrane module, and mould material is a composite nanometer filtering film, and entrance pressure is 6.0～45.0bar, and going out to press is 4.5～43.5 bar.
Above-mentioned ultra-filtration equipment is the immersion ultrafiltration.Ultra-filtration equipment can be a kind of of immersion ultrafiltration, pillar ultrafiltration, tubular type ultrafiltration, rolling ultrafiltration or plate-type hyperfiltration.
Step I, film filtration concentrated processing
Ultrafiltration of step h immersion and nanofiltration are circulated to anoxic pond through blowback stream after filtering the liquid concentrator process electric capacity desalting treatment that produces again.
The effluent quality situation of the percolate after table 5 is handled
Sequence number Project Unit Measured value Sequence number Project Unit Measured value
1 COD Cr mg/L 54 5 Ammonia nitrogen mg/L ≤5
2 SS mg/L ≤5 6 Colourity Doubly 3
3 Turbidity NTU ≤5 7 The pH value - 7.2
4 BOD 5 mg/L 17 8 Specific conductivity μS/cm ≤1200
Embodiment 3
The percolate treatment project of certain garbage sanitary filling field 1500 ton per day
The former water of described percolate is as shown in table 6 through testing index.
The water quality situation of the former water of table 6 percolate.
Sequence number Project Unit Measured value Sequence number Project Unit Measured value
1 COD Cr mg/L 284300 5 Ammonia nitrogen mg/L 4510
2 SS mg/L 1381 6 Colourity Doubly 4500
3 Turbidity NTU 1200 7 The pH value - 9.5
4 BOD 5 mg/L 42800 8 Specific conductivity μS/cm 11290
Step a, ammonia nitrogen removal
Percolate gets into equalizing tank through pipeline and regulates water quality, the balanced water yield, and feasible flow and parameter from refuse landfill percolate of different nature everywhere is able to abundant adjusting, is convenient to follow-up unitary processing.And in equalizing tank, add lime adjusting pH value to 10 ~ 11 through chemicals dosing plant; Flow in the gravity machine then; Making ammonia nitrogen in high density in the percolate convert free ammonia to through air stripping is blown; To reach the purpose of removing ammonia nitrogen, get into coagulation basin after making its ammonia nitrogen concentration≤200mg/L, the ammonia that stripping goes out is then produced the ammonium sulfate sub product with sulfuric acid absorption
Step b, flocculation sediment
Flow into coagulation basin behind the percolate ammonia nitrogen removal, percolate per ton adds 1500g ferrous sulfate (FeSO 4), the back that reacts completely gets into preliminary sedimentation tank, and the deposition of preliminary sedimentation tank (being mud) is sent in the sludge sump through pump and pipeline, in sludge dehydration device, carries out filtering separation at last; The COD of percolate is reduced by 10～35% back entering electrolysis machines.
Above-mentioned ferrous sulfate is a flocculation agent.Flocculation agent can be aluminium salt (Tai-Ace S 150, aluminum chloride), molysite (ferric sulfate, ferrous sulfate, iron(ic)chloride), gather aluminium (Poly aluminum Chloride (PAC), polyaluminium sulfate, polymer aluminium silicate), a kind of or any combination more than two kinds in gather iron (poly-ferric chloride, bodied ferric sulfate, polymeric silicicacid iron), organic polymer coargulator or the microbial flocculant.
Step c, electrolysis
Percolate after the flocculation sediment processing is pumped into the electrolysis machine electrolysis, pond in the middle of getting into after the electrolysis, and add reductive agent, remove the remaining radical that electrolysis produces; The current density of electrolysis machine is 320mA/cm 2, two interpolar voltages are 12 V.
Steps d, electric capacity desalination
Through the specific conductivity >=5000 μ s/cm of percolate after the step c electrolysis treatment,, get into step e anaerobic treatment after making its specific conductivity be reduced to 500～3000 μ s/cm therefore earlier through the electric capacity desalting treatment.
Step e, anaerobic treatment
Percolate after the electric capacity desalting treatment gets in hydrolysis acidification pool and the anoxic pond successively; The residence time is 72 hours; Larger molecular organics in hydrolysis acidification pool in percolate acidication under the effect of acid-producing bacteria becomes small organic molecule; Resolve into methane and carbonic acid gas under the absorption of anerobes, the oxygen bacterium of holding concurrently, fermentation, the acting in conjunction of product methane in the process anoxic pond again, improve the B/C value, improve biodegradability; Denitrification through denitrifying bacterium in the anoxic pond simultaneously further removes the ammonia nitrogen in the percolate.
Step f, aerobic treatment
Percolate after the anaerobic treatment gets into and contains in the Aerobic Pond of mikrobes such as aerobic bacteria, nitrobacteria and nitrite bacteria; The residence time is 280 hours; Make good use of the organism in the further oxygenolysis percolate of oxygen animalcule, the degree of depth is removed the COD in the percolate CrAnd BOD 5, utilize the nitrification of nitrobacteria and the nitrosification of nitrite bacteria to make ammonia-state nitrogen be converted into nitric nitrogen or nitrite nitrogen simultaneously; In addition, the mixed solution of Aerobic Pond is back to anoxic pond with the ratio of 3:1 through reflux pump.
Step g, re-electrolysis
COD>=the 400mg/L of the percolate after the aerobic treatment, therefore flowing into electrolysis machine carries out re-electrolysis, makes wherein larger molecular organics open loop chain rupture; Improve biodegradability; And during electrolysis, adjacent two interelectrode voltages of electrolysis machine are 16V, and current density is 300mA/cm 2
Step h, membrane filtration
Percolate after re-electrolysis is handled flows into second pond; Behind further COD, BOD and the SS that removes in the percolate of deposition, make water outlet reach the reuse water standard through pillar ultrafiltration and osmosis filtration successively, the mud part of second pond bottom flow in the anoxic pond through blowback; Another part flows in the sludge sump through pipeline; Become filtrating and mud cake through the sludge dehydration device filtering separation again, filtrating is back in the equalizing tank through pipeline, and mud cake is then transported outward.
The working conditions of said pillar ultrafiltration is: normal temperature～45 ℃, and WP is 3～300kPa; The membrane module of said r-o-is a rolled membrane module, and mould material is a composite package, and entrance pressure can be 6.0～45.0bar, goes out to press to can be 4.5～35 bar.
Above-mentioned ultra-filtration equipment is the pillar ultrafiltration.Ultra-filtration equipment can be a kind of of immersion ultrafiltration, pillar ultrafiltration, tubular type ultrafiltration, rolling ultrafiltration or plate-type hyperfiltration.
Step I, film filtration concentrated processing
After the liquid concentrator process electric capacity desalting treatment that ultrafiltration of step h pillar and osmosis filtration produce, be circulated to anoxic pond through blowback stream again.
The effluent quality situation of the percolate after table 7 is handled
Sequence number Project Unit Measured value Sequence number Project Unit Measured value
1 COD Cr mg/L 46 5 Ammonia nitrogen mg/L ≤5
2 SS mg/L ≤5 6 Colourity Doubly 5
3 Turbidity NTU ≤5 7 The pH value - 7.2
4 BOD 5 mg/L 21 8 Specific conductivity μS/cm ≤100
Above-mentionedly be merely embodiment of the present invention, but design concept of the present invention is not limited thereto, allly utilizes this design that the present invention is carried out the change of unsubstantiality, all should belong to the behavior of invading protection domain of the present invention.

Claims (11)

1. rubbish leachate treatment method is characterized in that it may further comprise the steps:
A, ammonia nitrogen removal
Percolate gets into equalizing tank through pipeline and regulates water quality; The balanced water yield; And in equalizing tank, add the pH regulator agent through chemicals dosing plant; Regulate in pH value back inflow ammonia-nitrogen desorption device or the reaction tank, in the ammonia-nitrogen desorption device, make ammonia nitrogen in high density in the percolate convert free ammonia to and be blown, perhaps in reaction tank, add an amount of Mg (OH) through chemicals dosing plant through steam or air stripping 2And H 3PO 4, with NH 4+Reaction generates MgNH 4PO 46H 2O (struvite) deposition to reach the purpose of removing ammonia nitrogen, gets into the subsequent disposal operation after making its ammonia nitrogen concentration≤200mg/L;
B, flocculation sediment
Flow into coagulation basin behind the percolate ammonia nitrogen removal; In coagulation basin, add an amount of flocculation agent through chemicals dosing plant; Back entering preliminary sedimentation tank reacts completely; The throw out of preliminary sedimentation tank (being mud) is sent in the sludge sump through pump and pipeline, in sludge dehydration device, carries out filtering separation at last, with the COD reduction by 10～35% of percolate;
C, electrolysis
Percolate after the flocculation sediment processing is pumped into the electrolysis machine electrolysis, pond in the middle of getting into after the electrolysis, and add reductive agent, remove the remaining radical that electrolysis produces; Adjacent two interelectrode voltages of electrolysis machine are 2～12V, and current density is 10～320mA/cm 2
D, electric capacity desalination
During the specific conductivity of percolate after through step c electrolysis treatment >=5000 μ s/cm, through steps d electric capacity desalting treatment, make its specific conductivity be reduced to 500～3000 μ s/cm earlier, get into step e anaerobic treatment then; During the specific conductivity of percolate after through step c electrolysis treatment＜5000 μ s/cm, directly get into step e anaerobic treatment;
E, anaerobic treatment
Percolate after electrolysis treatment or the electric capacity desalting treatment gets in hydrolysis acidification pool and the anoxic pond successively; The residence time is 8～72 hours; Larger molecular organics in hydrolysis acidification pool in percolate acidication under the effect of acid-producing bacteria becomes small organic molecule; Resolve into methane and carbonic acid gas under the absorption of anerobes, the oxygen bacterium of holding concurrently, fermentation, the acting in conjunction of product methane in the process anoxic pond again, improve the B/C value, improve biodegradability; Denitrification through denitrifying bacterium in the anoxic pond simultaneously further removes the ammonia nitrogen in the percolate;
F, aerobic treatment
Percolate after the anaerobic treatment gets into and contains in the Aerobic Pond of mikrobes such as aerobic bacteria, nitrobacteria and nitrite bacteria; The residence time is 16～360 hours; Make good use of the organism in the further oxygenolysis percolate of oxygen animalcule; The degree of depth is removed COD and the BOD in the percolate, utilizes the nitrification of nitrobacteria and the nitrosification of nitrite bacteria to make ammonia-state nitrogen be converted into nitric nitrogen or nitrite nitrogen simultaneously; In addition, the partially mixed liquid of Aerobic Pond is back to anoxic pond through reflux pump;
G, re-electrolysis
When through the COD of the percolate after the aerobic treatment>=400mg/L; The percolate that will pass through after the aerobic treatment carries out re-electrolysis; Make wherein larger molecular organics open loop chain rupture, improve biodegradability, and during electrolysis; Adjacent two interelectrode voltages of electrolysis machine are 3～18V, and current density is 20～320mA/cm 2When through the COD of the percolate after the aerobic treatment＜400mg/L, then directly get into step h membrane filtration;
H, membrane filtration
Percolate after Aerobic Process for Treatment or re-electrolysis are handled flows into second pond; Behind further COD, BOD and the SS that removes in the percolate of precipitation, make water outlet reach the recycled water standard through membrane filtration, the mud part of second pond bottom flow in the anoxic pond through blowback; Another part flows in the sludge-tank by pipeline; Become filtrating and mud cake through the sludge dehydration device isolated by filtration again, filtrating is back in the regulating reservoir through pipeline, and mud cake is then transported outward;
I, film filtration concentrated processing
After the liquid concentrator process electric capacity desalting treatment that step h membrane filtration produces, be circulated to anoxic pond through blowback stream again.
2. a kind of rubbish leachate treatment method as claimed in claim 1 is characterized in that: the device of ammonia-nitrogen desorption described in the step a is a kind of of stripping tower, packing tower or gravity machine; The ammonia that said stripping goes out can be back to soda ash production with hydrochloric acid absorption generation ammonium chloride and make mother liquor, and also used water absorbs and produces ammoniacal liquor or produce the ammonium sulfate sub product with sulfuric acid absorption;
A kind of rubbish leachate treatment method as claimed in claim 1 is characterized in that: MgNH described in the step a 4PO 46H 2O (struvite) throw out can be developed as composite fertilizer and use after processes such as granulation.
3. a kind of rubbish leachate treatment method as claimed in claim 1 is characterized in that: flocculation agent described in the step b is aluminium salt (Tai-Ace S 150, aluminum chloride), molysite (ferric sulfate, ferrous sulfate, iron(ic)chloride), gather aluminium (Poly aluminum Chloride (PAC), polyaluminium sulfate, polymer aluminium silicate), a kind of or any combination more than two kinds in gather iron (poly-ferric chloride, bodied ferric sulfate, polymeric silicicacid iron), organic polymer coargulator or the microbial flocculant; Said pH regulator agent is a kind of in sulfuric acid, hydrochloric acid, sodium hydroxide, yellow soda ash, sodium hydrogencarbonate, the lime.
4. like claim 1 or 4 described a kind of rubbish leachate treatment method, it is characterized in that: optimum flocculent described in the step b is bodied ferric sulfate (PFS), and its dosage is percolate 200～2000g per ton.
5. like claim 1 or 4 described a kind of rubbish leachate treatment method, it is characterized in that: optimum flocculent described in the step b is ferrous sulfate (FeSO 4), its dosage is percolate 230～1800g per ton.
6. a kind of rubbish leachate treatment method as claimed in claim 1; It is characterized in that: electrolysis machine described in the step c is provided with power supply and electrolyzer, and the electrode materials in the electrolyzer is a kind of in alloy and the nano-catalytic noble electrode of graphite, titanium, iron, aluminium, zinc, copper, lead, nickel, molybdenum, chromium, metal etc.; The top layer of said nano-catalytic noble electrode is coated with the MOX inertia catalyst coatings that crystal grain is 10～35nm; The substrate of said nano-catalytic noble electrode can be titanium plate or plastic plate.
7. like claim 1 or 7 described a kind of rubbish leachate treatment method; It is characterized in that: best electrolysis described in the step c is the nano-catalytic electrolysis; Electrolytic WV is 2～500V, and adjacent two interelectrode voltages are 2～8 V, and current density is 10～300mA/cm 2
8. a kind of rubbish leachate treatment method as claimed in claim 1 is characterized in that: the reflux ratio of mixed solution described in the step f is 3:1 or 2:1.
9. a kind of rubbish leachate treatment method as claimed in claim 1 is characterized in that: membrane filtration described in the step h filters for the percolate through the second pond precipitate and separate passes through membrane bioreactor (MBR) again; Said MBR device membrane module is selected from a kind of in pvdf hollow-fibre membrane, polypropylene hollow fiber membrane, ps hollow fiber uf membrane, polyethersulfone, polyacrylonitrile and the PVC hollow fiber membrane; Membrane pore size is 0.10～0.2 μ m; WP is-1～-50kPa, working temperature is 5～45 ℃.
10. a kind of rubbish leachate treatment method as claimed in claim 1 is characterized in that: behind the percolate process ultra-filtration filters of membrane filtration described in the step h for process second pond precipitate and separate, filter through nanofiltration again; Said ultrafiltration is a kind of of immersion ultrafiltration, pillar ultrafiltration, tubular type ultrafiltration, rolling ultrafiltration or plate-type hyperfiltration; Molecular weight cut-off is 1000～100000MWCO; Working conditions is: normal temperature～45 ℃; The WP of immersion ultrafiltration is-1～-50kPa, the WP of pillar ultrafiltration, tubular type ultrafiltration, rolling ultrafiltration and plate-type hyperfiltration is 3～300kPa; The membrane module of said nanofiltration is a rolled membrane module, and the mould material of nf membrane is cellulose acetate film or a composite nanometer filtering film in the organic membrane, and the molecular weight cut-off of nf membrane is 200～500MWCO, and entrance pressure is 6.0～45.0bar, and going out to press is 4.5～43.5 bar.
11. a kind of rubbish leachate treatment method as claimed in claim 1 is characterized in that: behind the percolate elder generation process ultra-filtration filters of membrane filtration described in the step h for process second pond precipitate and separate, pass through r-o-(RO) again and filter; The membrane module of said r-o-is a rolled membrane module, and mould material is cellulose acetate film or a composite package in the organic membrane, and the molecular weight cut-off of mould material is 50～200MWCO, and entrance pressure can be 6.0～45.0bar, goes out to press to can be 4.5～35 bar.
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