CN102603119A - Garbage leachate treatment device and treatment method thereof - Google Patents

Garbage leachate treatment device and treatment method thereof Download PDF

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Publication number
CN102603119A
CN102603119A CN2012100657565A CN201210065756A CN102603119A CN 102603119 A CN102603119 A CN 102603119A CN 2012100657565 A CN2012100657565 A CN 2012100657565A CN 201210065756 A CN201210065756 A CN 201210065756A CN 102603119 A CN102603119 A CN 102603119A
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waste water
pond
treatment
water
electrolysis
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CN102603119B (en
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张世文
许雅玲
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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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    • 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
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • 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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • 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
    • 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
    • C02F3/28—Anaerobic digestion 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
    • 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

Abstract

The invention discloses a garbage leachate treatment device, which comprises a regulating tank, a coagulating tank, a primary settling tank, an electrolytic machine, a hydrolytic acidification tank, an anoxia tank, an aerobic tank, a secondary settling tank, a sludge tank and a sludge dewatering device. A perfect waste water treatment effect can be realized by the aid of cooperation of various treatment units. The invention further discloses a treatment method applicable to the treatment device. The method includes steps of regulating, coagulation, settling, electrolysis, hydrolytic acidification, anoxia treatment, aerobic treatment and secondary settling. The garbage leachate treatment device and the treatment method have the advantages that garbage leachate treated by the treatment method can meet the discharge standards of the Pollution Control Standards for Domestic Refuse Landfills (GB16889-2008), and cost is quite low.

Description

The treatment unit of percolate and treatment process thereof
Technical field
The invention belongs to field of environment engineering, it relates to a kind of treatment unit of sewage, is meant especially that a kind of cost is lower, the effect treatment unit of percolate preferably; The invention still further relates to this rubbish leachate treatment method, the waste water of handling through this method can reach " household refuse landfill sites pollution control criterion " (GB16889-2008) emission standard.
Background technology
Percolate is a kind of high concentrated organic wastewater 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 Variation range Project Variation range
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 1200～100000 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, COD Cr, BOD 5With ammonia nitrogen be 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 CrConcentration is high, makes 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 Cr, BOD 5, BOD 5/ COD CrCan increase with " age " of landfill yard and reduce, 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 also is to adopt materialization to handle the scheme that combines with biological treatment among the patent document CN1478737, in this technology, utilizes ceramic membrane that the percolate of handling through electrolytic oxidation is carried out reverse-osmosis treated.
In above-mentioned treatment process, especially ammonia nitrogen is handled and the method that adopts has the alkali of adding blow-off method, chlorine break method.With regard to state-of-the art, add the alkali blow-off method because high (20 yuan/m of suspension object height and processing cost in the waste water 3) and can't put it over; Chlorine break method is because of the ammonia-nitrogen content height and need a large amount of chlorine and sodium hydroxide make cost very high (30 yuan/m 3), also can't promote.
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, power consumption is big, the life-span is short, cost is higher, and it is unsatisfactory therefore to be applied to wastewater treatment aspect effect.
Summary of the invention
The invention provides the treatment unit of percolate, the garbage filter fluid power after handling through this treatment unit reaches emission standard; The present invention also provides the rubbish leachate treatment method of simple, the with low cost and ideal treatment effect of a kind of technology, and its purpose is to overcome complex process, the defect of high cost that prior art exists.
Technical scheme of the present invention is following:
The treatment unit of percolate, it comprises equalizing tank, coagulation basin, preliminary sedimentation tank, electrolysis machine, hydrolysis acidification pool, anoxic pond, Aerobic Pond, second pond, sludge sump and sludge dehydration device; The import of described equalizing tank connects with the outlet of percolate, and the equalizing tank water outlet connects with the coagulation basin water-in, and the coagulation basin water outlet connects with the preliminary sedimentation tank water-in; The preliminary sedimentation tank water outlet connects with the electrolysis machine water-in; The electrolysis machine water outlet connects with the hydrolysis acidification pool water-in, and the hydrolysis acidification pool water outlet connects with the anoxic pond water-in, and the anoxic pond water outlet connects with the Aerobic Pond water-in; The Aerobic Pond water outlet connects with the second pond water-in; The second pond water outlet connects with sewage vent line, and the sludge outlet of preliminary sedimentation tank and second pond connects with sludge sump, is provided with sludge pump between sludge sump and the sludge dehydration device.
A pH regulator agent chemicals dosing plant and flocculation agent chemicals dosing plant are arranged respectively on said equalizing tank and the coagulation basin.
Said treatment unit comprises that also one makes the partially mixed liquid of Aerobic Pond be back to the mixed-liquor return pump of anoxic pond, and the reflux ratio of said mixed solution is 3:1 or 2:1.
Garbage filter liquid processing method of the present invention passes through to adopt aforesaid garbage filter liquid processing device, and realize through following steps:
A, flocculation sediment
Percolate gets into equalizing tank through pipeline, 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.In equalizing tank, add pH regulator agent adjusting pH value and flow into coagulation basin for behind the 7-10; Add flocculation agent through chemicals dosing plant; Back entering preliminary sedimentation tank reacts completely; Deposition (being mud) is sent in the sludge sump through pump and pipeline, in sludge dehydration device, carries out filtering separation at last, and waste water then gets into electrolysis machine;
B, electrolysis
Waste water after the flocculation sediment processing is pumped into the electrolysis machine electrolysis.Electrolytic WV is 2～1000V, and adjacent two interelectrode voltages are 2～12 V, and current density is 1～320mA/cm 2, the residence time of waste water in electrolysis machine is 2～50s;
C, anaerobic treatment
Waste water after the electrolysis treatment gets in hydrolysis acidification pool and the anoxic pond successively; Make the larger molecular organics acidication under the effect of acid-producing bacteria in the waste water become small organic molecule; Resolve into methane and carbonic acid gas under the actings in conjunction such as the absorption of anerobes, the various mikrobes such as oxygen bacterium of holding concurrently, fermentation, product methane in the process anoxic pond again; Improve the B/C value, improve biodegradability; Denitrification through denitrifying bacterium in the anoxic pond simultaneously removes the ammonia nitrogen in the waste water;
D, aerobic treatment
Waste water after the anaerobic treatment gets into and contains in the Aerobic Pond of aerobic bacteria and Nitrate bacteria, makes good use of the organism in the further oxygenolysis waste water of oxygen animalcule, and the degree of depth is removed the COD in the waste water 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;
E, deposition
Waste water after the aerobic treatment flows into second pond, further removes the COD in the waste water Cr, BOD 5, SS etc., but the water outlet qualified discharge of second pond, 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.
In step a, one or more combinations that described 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), gather iron in (poly-ferric chloride, bodied ferric sulfate, polymeric silicicacid iron); Said pH regulator agent is a kind of in sulfuric acid, sodium hydroxide, yellow soda ash, sodium hydrogencarbonate, the lime.
In step a, described optimum flocculent is bodied ferric sulfate (PFS), and dosage is waste water 200～2000g per ton.
In step a, described optimum flocculent is ferrous sulfate (FeSO 4), dosage is waste water 230～1800g per ton.
In step b, the anode of said electrolysis machine is metal or Graphite Electrodes, and the negative electrode of said electrolysis machine is iron cathode, aluminium negative electrode, stainless steel cathode, nickel cathode, titanium or zinc negative electrode.
Further, in step b, the structure of described nano-catalytic electrolysis machine is seen Chinese patent CN102010038A, and anode is coated with the noble electrode that crystal grain is the nano-noble metal oxygen thing coating of 15～32nm for being substrate with the titanium at substrate surface.The negative electrode of said nano-catalytic electrolysis machine is iron cathode, aluminium negative electrode, stainless steel cathode, nickel cathode, titanium or zinc negative electrode etc.The WV of said nano-catalytic electrolysis machine is 2～500V, and two interelectrode voltages are 2～8 V, and electrolysis density is 10～300mA/cm 2, keeping the residence time of waste water in the nano-catalytic electrolysis machine is 2～30s.
During nano-catalytic electrolysis percolate, the radical chlorine [Cl] of generation, radical oxygen [O] and hydroxyl [OH] etc. are killed organism, the ammonium ion in mikrobe in the waste water, the oxygenolysis waste water, make the big ring open loop of organic substance in the waste water; The colourity of waste water had both been eliminated in the long-chain chain rupture, had also removed stink; Also improve the biodegradability of waste water; And waste water is taken off under electric field action surely, the suspended substance in the waste water, colloid, charged corpuscle form larger particles.In addition, the positively charged ion in the waste water, 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 nano-catalytic to have following outstanding effect:
At first, make the macrocylc compound open loop in the waste water through electrolysis, the long-chain chain rupture, the radical oxygenolysis organism of generation reduces COD fast Cr, improved the biodegradability of waste water, thereby created better biochemical condition for follow-up anaerobic unit.
Secondly, kill the mikrobe in the waste water, 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 waste water 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 waste water less than 100mg/L, eliminates stink in the water simultaneously.
The 4th, reduce the colourity of waste water 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 waste water, auxochrome group, and the reduction chroma in waste water reaches the purpose of decolouring.
The 5th, deodorizing, the osmophore in multiple radical (strong oxidizing property material) the oxygenolysis waste water that electrolysis produces is removed the stench in the waste water.
The 6th; Positively charged ion during electrolysis in the waste water 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 waste water, thereby alleviate inhibition, the toxic action of heavy metal ion anaerobism, aerobic microbiological in the follow-up unit.
In steps d, the mixed solution in the said Aerobic Pond is partly refluxed in the anoxic pond, and reflux ratio is 3:1 or 2:1, helps the ammonia nitrogen that the denitrification of denitrifying bacterium in the anoxic pond removes waste water.
Can know by the above-mentioned description of this invention, compare, the invention has the advantages that with prior art:
(1) through electrolysis step, not only can reduce COD fast Cr, improved the biodegradability of waste water, and can reach 80～90% the decreasing ratio of ammonia nitrogen, effectively remove heavy metal ions in wastewater 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 15～32nm 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 electric energy that the ton wastewater treatment consumes reduces significantly.
(3) bioremediation through anaerobic treatment and aerobic treatment can further effectively reduce ammonia nitrogen, the COD in the percolate CrAnd BOD 5
(4) cooperate in order through above-mentioned each step and can guarantee that percolate reaches " household refuse landfill sites pollution control criterion " (GB16889-2008) emission standard after handling.
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.
With reference to Fig. 1, the treatment unit of percolate, it comprises: equalizing tank 1, coagulation basin 2, preliminary sedimentation tank 3, electrolysis machine 4, hydrolysis acidification pool 5, anoxic pond 6, Aerobic Pond 7, second pond 8, sludge sump 9 and sludge dehydration device 10; The import of equalizing tank 1 connects with the outlet of percolate; Equalizing tank 1 water outlet connects with coagulation basin 2 water-ins; Coagulation basin 2 water outlets connect with preliminary sedimentation tank 3 water-ins, and preliminary sedimentation tank 3 water outlets connect with electrolysis machine 4 water-ins through water pump 34, and electrolysis machine 4 water outlets connect with hydrolysis acidification pool 5 water-ins; Hydrolysis acidification pool 5 water outlets connect with anoxic pond 6 water-ins; Anoxic pond 6 water outlets connect with Aerobic Pond 7 water-ins, and Aerobic Pond 7 water outlets connect with second pond 8 water-ins, and second pond 8 water outlets connect with sewage vent line.The sludge outlet of preliminary sedimentation tank 3 and second pond 8 then connects with sludge sump 9, is provided with sludge pump 11 between sludge sump 9 and the sludge dehydration device 10, and sludge pump 11 can pump into the mud in the sludge sump 9 in the sludge dehydration device 10 and handle.On equalizing tank 1 and the coagulation basin 2 a pH regulator agent chemicals dosing plant (not drawing among the figure) and flocculation agent chemicals dosing plant (not drawing among the figure) are arranged respectively, above-mentioned chemicals dosing plant can be respectively to adding pH regulator agent and flocculation agent in equalizing tank 1 and the coagulation basin 2.
Can find out that from Fig. 1 treatment unit comprises that also a partially mixed liquid that makes Aerobic Pond 7 is back to the mixed-liquor return pump 67 of anoxic pond 6.
Provide the specific embodiment of garbage filter liquid processing device method below in conjunction with Fig. 1.
Embodiment 1
The percolate treatment project of certain garbage sanitary filling field 800 ton per day
The former water of described percolate is as shown in table 2 through testing index.
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 4000 5 Ammonia nitrogen mg/L 900
2 SS mg/L 600 6 Colourity Doubly 1000
3 Turbidity NTU 510 7 The pH value - 7.0
4 BOD 5 mg/L 2500 8 Specific conductivity μS/cm 8500
Can find out that from table 2 Pollutant levels of percolate are high, COD Cr, BOD 5With ammonia nitrogen be more than tens～hundred times of industrial pollutants discharging standards mostly.Present embodiment can effectively utilize above-mentioned treatment unit treating refuse percolate, and its concrete treatment process is following:
Step a, flocculation sediment
Waste water is pressed 40m through water 3The flow velocity of/h gets into equalizing tank 1; Get into coagulation basin 2 behind the thorough mixing; The back that reacts completely that waste water per ton adds 300g bodied ferric sulfate (PFS) gets into preliminary sedimentation tank 3; The sludge settling of preliminary sedimentation tank 3 is sent in the sludge sump 9 through pump and pipeline, in sludge dehydration device 10, carries out filtering separation at last, and the waste water of preliminary sedimentation tank 3 then flows into electrolysis machine 4 through pump 34.
Step b, electrolysis
Waste water is separated through flowing into electrolysis dynamo-electric 4 behind the flocculation sediment, and said electrolysis machine 4 is the nano-catalytic electrolysis machine, and its WV is 48V, and current density is 200mA/cm 2, two interpolar voltages are for 3.6 V, and the residence time of waste water in electrolysis machine 4 is 10s.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 waste water of hydroxyl [OH] ability; Make the big organic molecule open loop, chain rupture, the macromole that are difficult to biochemical degradation in the waste water be decomposed into small molecules, reduce COD CrWith improve waste water can be biochemical, for biochemistry provides better condition; Make chromophoric group, the auxochrome group oxidation of the dye molecule in the waste water simultaneously or be reduced to colourless group, reach the purpose of decolouring; Moreover; Positively charged ion in the waste water and negatively charged ion move to the negative electrode and the anode of electrolysis machine 4 electrolyzers respectively; Near negative electrode and anode, form deposition; Thereby the heavy metal ion content in the reduction waste water, 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 waste water, and make suspended substance, colloid, charged corpuscle in the waste water under electric field action, form larger particles.
Step c, anaerobic treatment
Waste water after the electrolysis treatment gets in hydrolysis acidification pool 5 and the anoxic pond 6 successively; Make the larger molecular organics acidication under the effect of acid-producing bacteria in the waste water become small organic molecule; Resolve into methane and carbonic acid gas under the actings in conjunction such as the absorption of anerobes, the various mikrobes such as oxygen bacterium of holding concurrently, fermentation, product methane in the process anoxic pond 6 again; Improve the B/C value, improve biodegradability; Denitrification through denitrifying bacterium in the anoxic pond 6 simultaneously removes the ammonia nitrogen in the waste water.
Steps d, aerobic treatment
Waste water after the anaerobic treatment gets in the Aerobic Pond 7 successively, makes good use of the organism in the further oxygenolysis waste water of oxygen animalcule, and the degree of depth is removed the COD in the waste water 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.Mixed solution in the Aerobic Pond 7 is back in the anoxic pond 6 through the ratio of mixed-liquor return pump 67 with 2:1, utilizes the denitrification of the denitrifying bacterium in the anoxic pond 6 to remove the ammonia nitrogen of waste water.
Step e, deposition
Waste water after the aerobic treatment flows into second pond 8 and carries out precipitate and separate, further removes the COD in the waste water Cr, BOD 5, SS etc., but the water outlet qualified discharge of second pond 8, the water quality situation of water outlet is as shown in table 3; The mud part of second pond 8 bottoms is back in the anoxic pond 6 through pump 68, and another part flows in the sludge sump 9 through pipeline, becomes filtrating and mud cake through sludge dehydration device 10 filtering separation again, and filtrating is back in the equalizing tank 1 through pipeline, and mud cake is then transported outward.
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 80 5 Ammonia nitrogen mg/L 10
2 SS mg/L 30 6 Colourity Doubly 10
3 Turbidity NTU 12 7 The pH value - 7.5
4 BOD 5 mg/L 30 8 Specific conductivity μS/cm 4100
Can know COD from table 3 CrObviously reduce with ammonia nitrogen content, each item index can both reach " household refuse landfill sites pollution control criterion " (GB16889-2008) emission standard.
Embodiment 2
The percolate treatment project of certain garbage sanitary filling field 500 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 96100 5 Ammonia nitrogen mg/L 1250
2 SS mg/L 848 6 Colourity Doubly 1500
3 Turbidity NTU 700 7 The pH value - 7.0
4 BOD 5 mg/L 69200 8 Specific conductivity μS/cm 8480
Present embodiment can effectively utilize above-mentioned treatment unit treating refuse percolate, and its concrete treatment process is following:
Step a, flocculation sediment
Waste water is pressed 25m through water 3The flow velocity of/h gets into equalizing tank 1; Get into coagulation basin 2 behind the thorough mixing; Waste water per ton adds the 500g ferrous sulfate, and the back that reacts completely gets into preliminary sedimentation tank 3, and the sludge settling of preliminary sedimentation tank 3 is sent in the sludge sump 9 through pump and pipeline; In sludge dehydration device 10, carry out filtering separation at last, the waste water of preliminary sedimentation tank 3 then flows into electrolysis machine 4 through pump 34.
Step b, electrolysis
Waste water is separated through flowing into electrolysis dynamo-electric 4 behind the flocculation sediment, and said electrolysis machine 4 WVs are 4V, and current density is 15mA/cm 2, two interpolar voltages are for 2 V, and the residence time of waste water in electrolysis machine 4 is 10s.
Step c, anaerobic treatment
Waste water after the electrolysis treatment gets in hydrolysis acidification pool 5 and the anoxic pond 6 successively; Make the larger molecular organics acidication under the effect of acid-producing bacteria in the waste water become small organic molecule; Resolve into methane and carbonic acid gas under the actings in conjunction such as the absorption of anerobes, the various mikrobes such as oxygen bacterium of holding concurrently, fermentation, product methane in the process anoxic pond 6 again; Improve the B/C value, improve biodegradability; Denitrification through denitrifying bacterium in the anoxic pond 6 simultaneously removes the ammonia nitrogen in the waste water.
Steps d, aerobic treatment
Waste water after the anaerobic treatment gets in the Aerobic Pond 7 successively, makes good use of the organism in the further oxygenolysis waste water of oxygen animalcule, and the degree of depth is removed the COD in the waste water 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.Mixed solution in the Aerobic Pond 7 is back in the anoxic pond 6 through the ratio of mixed-liquor return pump 67 with 3:1, utilizes the denitrification of the denitrifying bacterium in the anoxic pond 6 to remove the ammonia nitrogen of waste water.
Step e, deposition
Waste water after the aerobic treatment flows into second pond 8 and carries out precipitate and separate, further removes the COD in the waste water Cr, BOD 5, SS etc., but the water outlet qualified discharge of second pond 8, the water quality situation of water outlet is as shown in table 5; The mud part of second pond 8 bottoms is back in the anoxic pond 6 through pump 68, and another part flows in the sludge sump 9 through pipeline, becomes filtrating and mud cake through sludge dehydration device 10 filtering separation again, and filtrating is back in the equalizing tank 1 through pipeline, and mud cake is then transported outward.
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 74 5 Ammonia nitrogen mg/L 14.2
2 SS mg/L 28 6 Colourity Doubly 5
3 Turbidity NTU 23 7 The pH value - 7.3
4 BOD 5 mg/L 30 8 Specific conductivity μS/cm 8150
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 185660 5 Ammonia nitrogen mg/L 1360
2 SS mg/L 1420 6 Colourity Doubly 2600
3 Turbidity NTU 1400 7 The pH value - 6.5
4 BOD 5 mg/L 131408 8 Specific conductivity μS/cm 3040
Present embodiment can effectively utilize above-mentioned treatment unit treating refuse percolate, and its concrete treatment process is following:
Step a, flocculation sediment
Waste water is pressed 75m through water 3The flow velocity of/h gets into equalizing tank 1; Get into coagulation basin 2 behind the thorough mixing; The back that reacts completely that waste water per ton adds 1500g bodied ferric sulfate (PFS) gets into preliminary sedimentation tank 3; The sludge settling of preliminary sedimentation tank 3 is sent in the sludge sump 9 through pump and pipeline, in sludge dehydration device 10, carries out filtering separation at last, and the waste water of preliminary sedimentation tank 3 then flows into electrolysis machine 4 through pump 34.
Step b, electrolysis
Waste water is separated through flowing into electrolysis dynamo-electric 4 behind the flocculation sediment, and said electrolysis machine 4 its WVs are 960V, and current density is 320mA/cm 2, two interpolar voltages are for 12 V, and the residence time of waste water in electrolysis machine 4 is 50s.
Step c, anaerobic treatment
Waste water after the electrolysis treatment gets in hydrolysis acidification pool 5 and the anoxic pond 6 successively; Make the larger molecular organics acidication under the effect of acid-producing bacteria in the waste water become small organic molecule; Resolve into methane and carbonic acid gas under the actings in conjunction such as the absorption of anerobes, the various mikrobes such as oxygen bacterium of holding concurrently, fermentation, product methane in the process anoxic pond 6 again; Improve the B/C value, improve biodegradability; Denitrification through denitrifying bacterium in the anoxic pond 6 simultaneously removes the ammonia nitrogen in the waste water.
Steps d, aerobic treatment
Waste water after the anaerobic treatment gets in the Aerobic Pond 7 successively, makes good use of the organism in the further oxygenolysis waste water of oxygen animalcule, and the degree of depth is removed the COD in the waste water 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.Mixed solution in the Aerobic Pond 7 is back in the anoxic pond 6 through the ratio of mixed-liquor return pump 67 with 2:1, utilizes the denitrification of the denitrifying bacterium in the anoxic pond 6 to remove the ammonia nitrogen of waste water.
Step e, deposition
Waste water after the aerobic treatment flows into second pond 8 and carries out precipitate and separate, further removes the COD in the waste water Cr, BOD 5, SS etc., but the water outlet qualified discharge of second pond 8, the water quality situation of water outlet is as shown in table 7; The mud part of second pond 8 bottoms is back in the anoxic pond 6 through pump 68, and another part flows in the sludge sump 9 through pipeline, becomes filtrating and mud cake through sludge dehydration device 10 filtering separation again, and filtrating is back in the equalizing tank 1 through pipeline, and mud cake is then transported outward.
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 68 5 Ammonia nitrogen mg/L 12
2 SS mg/L 30 6 Colourity Doubly 8
3 Turbidity NTU 28 7 The pH value - 7.0
4 BOD 5 mg/L 24 8 Specific conductivity μS/cm 2890
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 (9)

1. the treatment unit of percolate is characterized in that it comprises: equalizing tank, coagulation basin, preliminary sedimentation tank, electrolysis machine, hydrolysis acidification pool, anoxic pond, Aerobic Pond, second pond, sludge sump and sludge dehydration device; The import of described equalizing tank connects with the outlet of percolate, and the equalizing tank water outlet connects with the coagulation basin water-in, and the coagulation basin water outlet connects with the preliminary sedimentation tank water-in; The preliminary sedimentation tank water outlet connects with the electrolysis machine water-in; The electrolysis machine water outlet connects with the hydrolysis acidification pool water-in, and the hydrolysis acidification pool water outlet connects with the anoxic pond water-in, and the anoxic pond water outlet connects with the Aerobic Pond water-in; The Aerobic Pond water outlet connects with the second pond water-in; The second pond water outlet connects with sewage vent line, and the sludge outlet of preliminary sedimentation tank and second pond connects with sludge sump, is provided with sludge pump between sludge sump and the sludge dehydration device.
2. the treatment unit of percolate as claimed in claim 1 is characterized in that: a pH regulator agent chemicals dosing plant and flocculation agent chemicals dosing plant are arranged respectively on said equalizing tank and the coagulation basin.
3. the treatment unit of percolate as claimed in claim 1 is characterized in that: said treatment unit comprises that also a partially mixed liquid that makes Aerobic Pond is back to the mixed-liquor return pump of anoxic pond, and the reflux ratio of said mixed solution is 3:1 or 2:1.
4. a kind of hair products cycling utilization of wastewater device as claimed in claim 1, it is characterized in that: the anode of said electrolysis machine is metal or Graphite Electrodes, the negative electrode of said electrolysis machine is iron cathode, aluminium negative electrode, stainless steel cathode, nickel cathode, titanium or zinc negative electrode.
5. a rubbish leachate treatment method is characterized in that, it adopts the treatment unit of the described percolate of claim 1, and said treatment process adopts following steps:
A, flocculation sediment
Percolate gets into equalizing tank through pipeline; And flow into coagulation basin after the agent of adding pH regulator is adjusted to 7-10 with the pH value in equalizing tank; In coagulation basin, add an amount of flocculation agent; Get into preliminary sedimentation tank after reacting completely, the deposition of preliminary sedimentation tank is sent in the sludge sump through pump and pipeline, in sludge dehydration device, carries out filtering separation at last; The waste water of preliminary sedimentation tank then pumps in the electrolysis machine;
B, electrolysis
The WV of electrolysis machine is 2～1000V, and adjacent two interelectrode voltages are 2～12V, and current density is 1～320mA/cm 2, the residence time of waste water in electrolysis machine is 2～50s;
C, anaerobic treatment
Waste water after the electrolysis treatment gets in hydrolysis acidification pool and the anoxic pond successively; Larger molecular organics in hydrolysis acidification pool in waste water 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 removes the ammonia nitrogen in the waste water;
D, aerobic treatment
Waste water after the anaerobic treatment gets into and contains in the Aerobic Pond of aerobic bacteria and Nitrate bacteria, makes good use of the organism in the further oxygenolysis waste water of oxygen animalcule, and the degree of depth is removed the COD in the waste water 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;
E, deposition
Waste water after the aerobic treatment flows into second pond, further removes the COD in the waste water Cr, BOD 5, SS etc., but the water outlet qualified discharge of second pond, 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.
6. a kind of rubbish leachate treatment method as claimed in claim 5 is characterized in that: the flocculation agent described in the step a is aluminium salt, molysite, gathers aluminium, gathers one or more combinations in the iron; Said pH regulator agent is a kind of in sulfuric acid, hydrochloric acid, sodium hydroxide, yellow soda ash, sodium hydrogencarbonate, the lime.
7. a kind of rubbish leachate treatment method as claimed in claim 5; It is characterized in that: the best electrolysis described in the step b 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, the residence time of waste water in electrolysis machine is 2～30s.
8. a kind of rubbish leachate treatment method as claimed in claim 5 is characterized in that: the optimum flocculent among the said step a is a bodied ferric sulfate, and its dosage is waste water 200～2000g per ton.
9. a kind of rubbish leachate treatment method as claimed in claim 5 is characterized in that: the optimum flocculent among the said step a is a ferrous sulfate, and its dosage is waste water 230～1800g per ton.
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