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CN102603119B - 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
CN102603119B
CN102603119B CN201210065756.5A CN201210065756A CN102603119B CN 102603119 B CN102603119 B CN 102603119B CN 201210065756 A CN201210065756 A CN 201210065756A CN 102603119 B CN102603119 B CN 102603119B
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China
Prior art keywords
waste water
pond
treatment
water
percolate
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CN201210065756.5A
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CN102603119A (en
Inventor
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

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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)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)

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 for the treatment of unit of sewage, refers to that especially a kind of cost is lower, the treatment unit of the good percolate of effect; The invention still further relates to the treatment process of this percolate, the waste water energy of processing through the method reaches < < household refuse landfill sites and pollutes control criterion > > (GB16889-2008) emission standard.
Background technology
Percolate is a kind of high concentrated organic wastewater that is difficult to process, and it is mainly from following three aspects: 1, the natural precipitation in landfill yard and runoff; 2, the water that rubbish self contains; 3, the water producing due to the anaerobic digestion of microorganism after garbage loading embeading; Wherein the precipitation in landfill yard is major portion.City garbage percolate pollutant load representative value is as shown in table 1.
The main component (except 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
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
As shown in Table 1, the water quality of percolate has following essential characteristic:
(1) Pollutant levels are high, COD cr, BOD 5more than being mostly tens～hundred times of industrial pollutants discharging standards with ammonia nitrogen.
(2) existing organic contamination composition, also has inorganic pollutant component, also contains some micro heavy pollutant components simultaneously, and comprehensive pollution feature is obvious.
(3) organic pollutant category is many, complicated component.In percolate, organic pollutant is many, up to 77 kinds, wherein has non-chlorination aromatics, chlorination aromatic series compounds such as being difficult to biodegradable naphthalene, phenanthrene, phosphoric acid ester, phthalic ester, phenolic compound and amino benzenes compounds etc.
(4) in percolate, contain 10 many kinds of metal ions, heavy metal ion wherein can produce severe inhibition effect to biological treatment process.
(5) in percolate, microbial nutrition element ratio is seriously lacked of proper care.Ammonia nitrogen concentration is wherein very high, and C/N is out of proportion, and when its nutritive props is processed than biological process, the needed nutritive props of microorganism growth greatly differs from each other, and to biological treatment, brings certain difficulty.
The ammonia-nitrogen content of percolate and COD crconcentration is high, makes surface water body anoxic, water quality deterioration; The nutritive substances such as nitrogen phosphorus are the inducements that causes body eutrophication, also may have a strong impact on drinking water source; Generally speaking, COD cr, BOD 5, BOD 5/ COD crcan increase and reduce with " age " of landfill yard, level of alkalinity raises.In addition, along with stacking the increase of the time limit, new refuse gradually becomes old rubbish, and Organic Pollutants of Landfill Leachate content declines to some extent, but ammonia-nitrogen content increase, and biodegradability reduction, so intractability is very large.
The emphasis that percolate is administered is the processing of the processing of COD and ammonia nitrogen, especially ammonia nitrogen.In prior art, there is the multiple technology and equipment for percolate is processed.For example in patent document CN1485280A, disclose a kind for the treatment of process that utilizes submerged combustion evaporation technique to carry out landfill waste percolate, this technique is mainly by oxidation operation being become to carbonic acid gas and water, and by evaporating and concentrated mode is processed penetrating fluid.The technology of utilizing anaerobism molecular breakdown method to carry out treating refuse percolate is disclosed in patent document CN1440941, the method comprises predecomposition step, anaerobism step, decomposes oxidation step, adsorption step, step of flocculation precipitation and filtration step, and the method combines the means of physical chemistry processing and biological treatment two aspects.Similarly, in patent document CN1478737, disclosed percolate is also to adopt materialization to process the scheme combining with biological treatment, in this technique, utilizes ceramic membrane to carry out reverse-osmosis treated to the percolate of processing through electrolytic oxidation.
In above-mentioned treatment process, especially ammonia nitrogen is processed and the method that adopts has the alkali of adding blow-off method, chlorine break method.With regard to state-of-the art, add alkali blow-off method because suspend in waste water object height and processing cost are high (20 yuan/m 3) and cannot put it over; Chlorine break method is because ammonia-nitrogen content is high and need a large amount of chlorine and sodium hydroxide to make cost very high (30 yuan/m 3), also cannot promote.
In addition, existing known electrolysis tech can effectively be removed the objectionable impurities in percolate, but the current density of traditional electrolysis is low, operating potential is high, electrical efficiency is very low, power consumption is large, the life-span is short, cost is higher, is therefore applied to wastewater treatment aspect effect unsatisfactory.
Summary of the invention
The invention provides the treatment unit of percolate, the percolate after processing by this treatment unit can reach emission standard; The present invention also provides the treatment process of the percolate of simple, the with low cost and ideal treatment effect of a kind of technique, and its object is to overcome the high defect of complex process, cost that prior art exists.
Technical scheme of the present invention is as follows:
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, equalizing tank water outlet connects with coagulation basin water-in, coagulation basin water outlet connects with preliminary sedimentation tank water-in, preliminary sedimentation tank water outlet connects with electrolysis machine water-in, electrolysis machine water outlet connects with hydrolysis acidification pool water-in, hydrolysis acidification pool water outlet connects with anoxic pond water-in, anoxic pond water outlet connects with Aerobic Pond water-in, Aerobic Pond water outlet connects with second pond water-in, second pond water outlet connects with sewage vent line, the sludge outlet of preliminary sedimentation tank and second pond connects with sludge sump, between sludge sump and sludge dehydration device, be provided with sludge pump.
On described equalizing tank and coagulation basin, there are respectively a pH adjusting agent chemicals dosing plant and flocculation agent chemicals dosing plant.
Described treatment unit also comprises that one makes the part mixed-liquor return of Aerobic Pond to the mixed-liquor return pump of anoxic pond, and the reflux ratio of described mixed solution is 3:1 or 2:1.
Method for treating garbage percolation liquid of the present invention passes through to adopt garbage leachate treatment device as above, and realize through following steps:
A, flocculation sediment
Percolate enters equalizing tank through pipeline, makes to be able to abundant adjusting from flow and the parameter of refuse landfill percolate of different nature everywhere, is convenient to the processing of follow-up unit.After adding pH adjusting agent to regulate pH value for 7-10, flow into coagulation basin in equalizing tank, by chemicals dosing plant, add flocculation agent, after reacting completely, enter preliminary sedimentation tank, precipitation (being mud) is sent in sludge sump through pump and pipeline, finally in sludge dehydration device, carry out filtering separation, waste water enters electrolysis machine;
B, electrolysis
Waste water after flocculation sediment is processed pumps into electrolysis machine electrolysis.The operating voltage of electrolysis 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 electrolysis treatment enters in hydrolysis acidification pool and anoxic pond successively, make the larger molecular organics acidication under the effect of acid-producing bacteria in waste water become small organic molecule, again through resolving into methane and carbon dioxide under the actings in conjunction such as the absorption of anerobe, the various microorganisms such as oxygen bacterium of holding concurrently in anoxic pond, fermentation, product methane, improve B/C value, improve biodegradability; Denitrification by denitrifying bacterium in anoxic pond simultaneously removes the ammonia nitrogen in waste water;
D, aerobic treatment
Waste water after anaerobic treatment enters in the Aerobic Pond that contains 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 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, precipitation
Waste water after aerobic treatment flows into second pond, further removes the COD in waste water cr, BOD 5, SS etc., the water outlet of second pond can qualified discharge, a mud part for second pond bottom through pump reflux to anoxic pond, another part flows in sludge sump by pipeline, through sludge dehydration device filtering separation, become filtrate and mud cake again, filtrate flow in equalizing tank through back of pipeline, and mud cake is transported outward.
In step a, described flocculation agent is one or more combinations in aluminium salt (Tai-Ace S 150, aluminum chloride), molysite (ferric sulfate, ferrous sulfate, iron(ic) chloride), poly-aluminium (polymerize aluminum chloride, polyaluminium sulfate, polymer aluminium silicate), Polyferric Sulfate (poly-ferric chloride, bodied ferric sulfate, polymeric silicicacid iron); Described pH adjusting agent is a kind of in sulfuric acid, sodium hydroxide, sodium carbonate, sodium bicarbonate, 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 described electrolysis machine is metal or Graphite Electrodes, and the negative electrode of described 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 shown in Chinese patent CN102010038A, and anode, for take titanium as substrate, is coated with at substrate surface the noble electrode that crystal grain is the nano-noble metal oxygen thing coating of 15～32nm.The negative electrode of described nano-catalytic electrolysis machine is iron cathode, aluminium negative electrode, stainless steel cathode, nickel cathode, titanium or zinc negative electrode etc.The operating voltage of described 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 nano-catalytic electrolysis machine is 2～30s.
During nano-catalytic electrolysis percolate, radical chlorine [Cl], radical oxygen [O] and the hydroxyl [OH] etc. that produce are killed organism, the ammonium ion in microorganism in waste water, oxygenolysis waste water, make the large ring open loop of organic substance in waste water, long-chain chain rupture, had both eliminated the colourity of waste water, had also removed stink, also improve the biodegradability of waste water, and making waste water de-steady under electric field action, the suspended substance in waste water, colloid, charged corpuscle, form larger particles.In addition, the positively charged ion in 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 precipitation and bring out throwing out, accelerating impurity sedimentation; The hydrogen small bubbles that electrolysis produces also have air flotation effect.
Adopt nano-catalytic to there is following outstanding effect:
First, by electrolysis, make the macrocylc compound open loop in waste water, long-chain chain rupture, the radical oxygenolysis organism of generation, fast reducing COD cr, improved the biodegradability of waste water, thereby created better biochemical condition for follow-up anaerobic unit.
Secondly, the multiple radical producing by electrolysis (strong oxidizing property material) is killed the microorganism in waste water, makes can cultivate larger dominant microflora in follow-up anaerobic treatment, brings into play better biochemical effect, makes the effluent quality of anaerobic treatment better.
The 3rd, the Inorganic Ammonium in 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 enters biochemical front waste water be less than 100mg/L, eliminates stink in water simultaneously.
The 4th, significantly reduce the colourity of waste water, the strong oxidizing property free radicals such as chlorine [Cl], hydroxyl [OH] and oxygen [O] that electrolysis produces can oxygenolysis residue in chromophoric group in waste water, auxochrome group, and reduction chroma in waste water reaches the object of decolouring.
The 5th, deodorizing, the osmophore in multiple radical (strong oxidizing property material) the oxygenolysis waste water that electrolysis produces, removes the stench in waste water.
The 6th, positively charged ion during electrolysis in waste water and negatively charged ion move to negative electrode and the anode of electrolysis machine electrolyzer respectively, there is Effect of Electric Double Layer, near negative electrode and anode, form precipitation, thereby the heavy metal ion content in reduction waste water, thereby alleviate inhibition, the toxic action of heavy metal ion to anaerobism, aerobic microbiological in follow-up unit.
In steps d, the mixed solution in described Aerobic Pond is partly refluxed in anoxic pond, and reflux ratio is 3:1 or 2:1, is conducive to the ammonia nitrogen that the denitrification of denitrifying bacterium in anoxic pond removes waste water.
From the above-mentioned description of this invention, compared to the prior art, the invention has the advantages that:
(1) by electrolysis step, not only can fast reducing COD cr, improve the biodegradability of waste water, and can reach 80～90% to the decreasing ratio of ammonia nitrogen, by electrolytic flocculation precipitating action, effectively remove heavy metal ions in wastewater, for follow-up treatment process is created better biochemical condition simultaneously.
(2) nano-catalytic electrolysis machine adopts surface coverage to have the noble electrode with the nano-catalytic coating that good catalytic effect crystal grain is 15～32nm to make anode, anode does not consume, cost is low, electrical efficiency is high, be the more than 10 times of ordinary electrode electrolytic efficiency, the electric energy that ton wastewater treatment consumes significantly reduces.
(3) bioremediation by anaerobic treatment and aerobic treatment can further effectively reduce ammonia nitrogen, the COD in percolate crand BOD 5.
(4) by above steps, coordinate in order the < < household refuse landfill sites that reaches that can guarantee after percolate is processed to pollute control criterion > > (GB16889-2008) emission standard.
Accompanying drawing explanation
Fig. 1 is process flow sheet of the present invention.
Embodiment
1 the specific 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, preliminary sedimentation tank 3 water outlets connect with electrolysis machine 4 water-ins through water pump 34, 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, 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 connects with sludge sump 9, between sludge sump 9 and sludge dehydration device 10, is provided with sludge pump 11, and sludge pump 11 can pump into the mud in sludge sump 9 in sludge dehydration device 10 and process.On equalizing tank 1 and coagulation basin 2, have respectively a pH adjusting agent chemicals dosing plant (not shown in FIG.) and flocculation agent chemicals dosing plant (not shown in FIG.), above-mentioned chemicals dosing plant can be respectively to adding pH adjusting agent and flocculation agent in equalizing tank 1 and coagulation basin 2.
As can be seen from Figure 1, treatment unit also comprises that one makes the part mixed-liquor return of Aerobic Pond 7 to the mixed-liquor return pump 67 of anoxic pond 6.
Below in conjunction with Fig. 1, provide the specific embodiment of garbage leachate treatment device method.
Embodiment 1
The percolate of certain garbage sanitary filling field 800 ton per day is processed engineering
Index is as shown in table 2 after measured for the former water of described percolate.
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 PH value - 7.0
4 BOD 5 mg/L 2500 8 Specific conductivity μS/cm 8500
As can be seen from Table 2, the Pollutant levels of percolate are high, COD cr, BOD 5more than being mostly tens～hundred times of industrial pollutants discharging standards with ammonia nitrogen.The present embodiment can effectively utilize above-mentioned treatment unit treating refuse percolate, and its concrete treatment process is as follows:
Step a, flocculation sediment
Waste water is pressed 40m through water 3the flow velocity of/h enters equalizing tank 1, after fully mixing, enter coagulation basin 2, waste water per ton enters preliminary sedimentation tank 3 after adding reacting completely of 300g bodied ferric sulfate (PFS), the sludge settling of preliminary sedimentation tank 3 is sent in sludge sump 9 through pump and pipeline, finally in sludge dehydration device 10, carry out filtering separation, the waste water of preliminary sedimentation tank 3 flows into electrolysis machine 4 by pump 34.
Step b, electrolysis
Waste water flows into electrolysis dynamo-electric 4 and separates after flocculation sediment, and described electrolysis machine 4 is nano-catalytic electrolysis machine, and its operating voltage is 48V, and current density is 200mA/cm 2, the voltage of two interpolars is for 3.6 V, and the residence time of waste water in electrolysis machine 4 is 10s.Organic substance in the free radical chlorine [Cl] of the strong oxidizing property that the micro-electrolysis of nano-catalytic produces, oxygen [O] and hydroxyl [OH] energy Quick Oxidation Decomposition Wastewater, make the large organic molecule open loop, chain rupture, the macromole that in waste water, are difficult to biochemical degradation 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 waste water simultaneously or be reduced to colourless group, reaching the object of decolouring; Moreover, positively charged ion in waste water and negatively charged ion move to negative electrode and the anode of electrolysis machine 4 electrolyzers respectively, near negative electrode and anode, form precipitation, thereby the heavy metal ion content in reduction waste water, thereby alleviate inhibition, the toxic action of heavy metal ion to anaerobism, aerobic microbiological in follow-up unit; In addition, can also kill microorganism in waste water, and make suspended substance, colloid, charged corpuscle in waste water form larger particles under electric field action.
Step c, anaerobic treatment
Waste water after electrolysis treatment enters in hydrolysis acidification pool 5 and anoxic pond 6 successively, make the larger molecular organics acidication under the effect of acid-producing bacteria in waste water become small organic molecule, again through resolving into methane and carbon dioxide under the actings in conjunction such as the absorption of anerobe, the various microorganisms such as oxygen bacterium of holding concurrently in anoxic pond 6, fermentation, product methane, improve B/C value, improve biodegradability; Denitrification by denitrifying bacterium in anoxic pond 6 simultaneously removes the ammonia nitrogen in waste water.
Steps d, aerobic treatment
Waste water after anaerobic treatment enters in 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 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.By mixed-liquor return pump 67, the ratio with 2:1 is back in anoxic pond 6 mixed solution in Aerobic Pond 7, utilizes the denitrification of the denitrifying bacterium in anoxic pond 6 to remove the ammonia nitrogen of waste water.
Step e, precipitation
Waste water after aerobic treatment flows into second pond 8 and carries out precipitate and separate, further removes the COD in waste water cr, BOD 5, SS etc., the water outlet of second pond 8 can qualified discharge, the water quality situation of water outlet is as shown in table 3; A mud part for second pond 8 bottoms is back in anoxic pond 6 through pump 68, and another part flows in sludge sump 9 by pipeline, then becomes filtrate and mud cake through sludge dehydration device 10 filtering separation, and filtrate flow in equalizing tank 1 through back of pipeline, and mud cake is transported outward.
The effluent quality situation of the percolate after table 3 is processed
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 PH value - 7.5
4 BOD 5 mg/L 30 8 Specific conductivity μS/cm 4100
As known from Table 3, COD crobviously reduce with the content of ammonia nitrogen, indices can reach < < household refuse landfill sites and pollute control criterion > > (GB16889-2008) emission standard.
Embodiment 2
The percolate of certain garbage sanitary filling field 500 ton per day is processed engineering
Index is as shown in table 4 after measured for the former water of described percolate.
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 PH value - 7.0
4 BOD 5 mg/L 69200 8 Specific conductivity μS/cm 8480
The present embodiment can effectively utilize above-mentioned treatment unit treating refuse percolate, and its concrete treatment process is as follows:
Step a, flocculation sediment
Waste water is pressed 25m through water 3the flow velocity of/h enters equalizing tank 1, after fully mixing, enter coagulation basin 2, waste water per ton adds 500g ferrous sulfate, after reacting completely, enter preliminary sedimentation tank 3, the sludge settling of preliminary sedimentation tank 3 is sent in sludge sump 9 through pump and pipeline, finally in sludge dehydration device 10, carry out filtering separation, the waste water of preliminary sedimentation tank 3 flows into electrolysis machine 4 by pump 34.
Step b, electrolysis
Waste water flows into electrolysis dynamo-electric 4 and separates after flocculation sediment, and described electrolysis machine 4 operating voltage are 4V, and current density is 15mA/cm 2, the voltage of two interpolars is for 2 V, and the residence time of waste water in electrolysis machine 4 is 10s.
Step c, anaerobic treatment
Waste water after electrolysis treatment enters in hydrolysis acidification pool 5 and anoxic pond 6 successively, make the larger molecular organics acidication under the effect of acid-producing bacteria in waste water become small organic molecule, again through resolving into methane and carbon dioxide under the actings in conjunction such as the absorption of anerobe, the various microorganisms such as oxygen bacterium of holding concurrently in anoxic pond 6, fermentation, product methane, improve B/C value, improve biodegradability; Denitrification by denitrifying bacterium in anoxic pond 6 simultaneously removes the ammonia nitrogen in waste water.
Steps d, aerobic treatment
Waste water after anaerobic treatment enters in 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 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.By mixed-liquor return pump 67, the ratio with 3:1 is back in anoxic pond 6 mixed solution in Aerobic Pond 7, utilizes the denitrification of the denitrifying bacterium in anoxic pond 6 to remove the ammonia nitrogen of waste water.
Step e, precipitation
Waste water after aerobic treatment flows into second pond 8 and carries out precipitate and separate, further removes the COD in waste water cr, BOD 5, SS etc., the water outlet of second pond 8 can qualified discharge, the water quality situation of water outlet is as shown in table 5; A mud part for second pond 8 bottoms is back in anoxic pond 6 through pump 68, and another part flows in sludge sump 9 by pipeline, then becomes filtrate and mud cake through sludge dehydration device 10 filtering separation, and filtrate flow in equalizing tank 1 through back of pipeline, and mud cake is transported outward.
The effluent quality situation of the percolate after table 5 is processed
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 PH value - 7.3
4 BOD 5 mg/L 30 8 Specific conductivity μS/cm 8150
Embodiment 3
The percolate of certain garbage sanitary filling field 1500 ton per day is processed engineering
Index is as shown in table 6 after measured for the former water of described percolate.
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 PH value - 6.5
4 BOD 5 mg/L 131408 8 Specific conductivity μS/cm 3040
The present embodiment can effectively utilize above-mentioned treatment unit treating refuse percolate, and its concrete treatment process is as follows:
Step a, flocculation sediment
Waste water is pressed 75m through water 3the flow velocity of/h enters equalizing tank 1, after fully mixing, enter coagulation basin 2, waste water per ton enters preliminary sedimentation tank 3 after adding reacting completely of 1500g bodied ferric sulfate (PFS), the sludge settling of preliminary sedimentation tank 3 is sent in sludge sump 9 through pump and pipeline, finally in sludge dehydration device 10, carry out filtering separation, the waste water of preliminary sedimentation tank 3 flows into electrolysis machine 4 by pump 34.
Step b, electrolysis
Waste water flows into electrolysis dynamo-electric 4 and separates after flocculation sediment, and described electrolysis machine 4 its operating voltage are 960V, and current density is 320mA/cm 2, the voltage of two interpolars is for 12 V, and the residence time of waste water in electrolysis machine 4 is 50s.
Step c, anaerobic treatment
Waste water after electrolysis treatment enters in hydrolysis acidification pool 5 and anoxic pond 6 successively, make the larger molecular organics acidication under the effect of acid-producing bacteria in waste water become small organic molecule, again through resolving into methane and carbon dioxide under the actings in conjunction such as the absorption of anerobe, the various microorganisms such as oxygen bacterium of holding concurrently in anoxic pond 6, fermentation, product methane, improve B/C value, improve biodegradability; Denitrification by denitrifying bacterium in anoxic pond 6 simultaneously removes the ammonia nitrogen in waste water.
Steps d, aerobic treatment
Waste water after anaerobic treatment enters in 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 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.By mixed-liquor return pump 67, the ratio with 2:1 is back in anoxic pond 6 mixed solution in Aerobic Pond 7, utilizes the denitrification of the denitrifying bacterium in anoxic pond 6 to remove the ammonia nitrogen of waste water.
Step e, precipitation
Waste water after aerobic treatment flows into second pond 8 and carries out precipitate and separate, further removes the COD in waste water cr, BOD 5, SS etc., the water outlet of second pond 8 can qualified discharge, the water quality situation of water outlet is as shown in table 7; A mud part for second pond 8 bottoms is back in anoxic pond 6 through pump 68, and another part flows in sludge sump 9 by pipeline, then becomes filtrate and mud cake through sludge dehydration device 10 filtering separation, and filtrate flow in equalizing tank 1 through back of pipeline, and mud cake is transported outward.
The effluent quality situation of the percolate after table 7 is processed
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 PH value - 7.0
4 BOD 5 mg/L 24 8 Specific conductivity μS/cm 2890
Above are only the specific embodiment of the present invention, but design concept of the present invention is not limited to this, allly utilizes this design to carry out the change of unsubstantiality to the present invention, all should belong to the behavior of invading protection domain of the present invention.

Claims (7)

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, equalizing tank water outlet connects with coagulation basin water-in, coagulation basin water outlet connects with preliminary sedimentation tank water-in, preliminary sedimentation tank water outlet connects with electrolysis machine water-in, the anode of electrolysis machine is for take titanium as substrate, at substrate surface, be coated with the noble electrode that crystal grain is the nano-noble metal oxide coating of 15～32nm, the negative electrode of nano-catalytic electrolysis machine is iron cathode, aluminium negative electrode, stainless steel cathode, nickel cathode, titanium or zinc negative electrode, the operating voltage of described nano-catalytic electrolysis machine is 2～500V, two interelectrode voltages are 2～8 V, current density is 10～300mA/cm 2keeping the residence time of waste water in nano-catalytic electrolysis machine is 2～30s, electrolysis machine water outlet connects with hydrolysis acidification pool water-in, hydrolysis acidification pool water outlet connects with anoxic pond water-in, anoxic pond water outlet connects with Aerobic Pond water-in, and Aerobic Pond water outlet connects with second pond water-in, and second pond water outlet connects with sewage vent line, the sludge outlet of preliminary sedimentation tank and second pond connects with sludge sump, between sludge sump and sludge dehydration device, is provided with sludge pump.
2. the treatment unit of percolate as claimed in claim 1, is characterized in that: on described equalizing tank and coagulation basin, have respectively a pH adjusting agent chemicals dosing plant and flocculation agent chemicals dosing plant.
3. the treatment unit of percolate as claimed in claim 1, is characterized in that: described treatment unit also comprises that one makes the part mixed-liquor return of Aerobic Pond to the mixed-liquor return pump of anoxic pond, and the reflux ratio of described mixed solution is 3:1 or 2:1.
4. a treatment process for percolate, is characterized in that, it adopts the treatment unit of percolate claimed in claim 1, and described treatment process adopts following steps:
A, flocculation sediment
Percolate enters equalizing tank through pipeline, and flow into coagulation basin after adding pH adjusting agent that pH value is adjusted to 7-10 in equalizing tank, in coagulation basin, add appropriate flocculation agent, after reacting completely, enter preliminary sedimentation tank, the precipitation of preliminary sedimentation tank is sent in sludge sump through pump and pipeline, finally in sludge dehydration device, carries out filtering separation; The waste water of preliminary sedimentation tank pumps in electrolysis machine;
B, electrolysis
The operating voltage of electrolysis machine is 2～500V, and adjacent two interelectrode voltages are 2～8V, and current density is 10～300mA/cm 2, the residence time of waste water in electrolysis machine is 2～30s;
C, anaerobic treatment
Waste water after electrolysis treatment enters in hydrolysis acidification pool and 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, in process anoxic pond, under the absorption of anerobe, the oxygen bacterium of holding concurrently, fermentation, the acting in conjunction of product methane, resolve into methane and carbon dioxide again, improve B/C value, improve biodegradability; Denitrification by denitrifying bacterium in anoxic pond simultaneously removes the ammonia nitrogen in waste water;
D, aerobic treatment
Waste water after anaerobic treatment enters in the Aerobic Pond that contains aerobic bacteria and nitrobacteria, 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 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, precipitation
Waste water after aerobic treatment flows into second pond, further removes the COD in waste water cr, BOD 5, SS etc., the water outlet of second pond can qualified discharge, a mud part for second pond bottom through pump reflux to anoxic pond, another part flows in sludge sump by pipeline, through sludge dehydration device filtering separation, become filtrate and mud cake again, filtrate flow in equalizing tank through back of pipeline, and mud cake is transported outward.
5. the treatment process of a kind of percolate as claimed in claim 4, is characterized in that: the flocculation agent described in step a is one or more combinations in aluminium salt, molysite, poly-aluminium, Polyferric Sulfate; Described pH adjusting agent is a kind of in sulfuric acid, hydrochloric acid, sodium hydroxide, sodium carbonate, sodium bicarbonate, lime.
6. the treatment process of a kind of percolate as claimed in claim 4, is characterized in that: the flocculation agent in described step a is bodied ferric sulfate, and its dosage is waste water 200～2000g per ton.
7. the treatment process of a kind of percolate as claimed in claim 4, is characterized in that: the flocculation agent in described step a is ferrous sulfate, and its dosage is waste water 230～1800g per ton.
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