CN102295385B - Garbage percolate processing technology - Google Patents
Garbage percolate processing technology Download PDFInfo
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Abstract
The invention relates to the technical field of sewage processing, and provides a garbage percolate processing technology. The technology comprises steps of coagulative precipitation, advanced catalytic oxidation, ammonia nitrogen stripping, combined biochemical processing, and the like. With the technology provided by the invention, ammonia nitrogen transformation rate and COD removing effect are greatly improved, garbage percolates at different stages can be effectively processed, and the processed percolates can all satisfy a discharge standard.
Description
Technical field
The present invention relates to a kind of technical field of sewage, a kind of specifically garbage leachate treatment process.
Background technology
Along with the propelling that rapid economy development and urbanization are built, the quantity of application of city life garbage also increases year by year fast, and consumer waste landfill percolate is the main pollution that landfill yard produces; Percolate possesses following two principal features: 1, percolate organic contamination substrate concentration is high; The COD of part percolate is up to tens thousand of mg/L, and colourity is higher, and distributes certain foul smell; Its ammonia nitrogen can reach several thousand mg/L, generally contains the heavy metal class material of higher concentration simultaneously; And has relatively than supersalinity more pathogenic microorganism.Middle and later periods percolate biodegradability is poor, and BOD/COD generally is in low scope.2, change of water quality is bigger, and leachate quality is with variations such as component of refuse, landfill process, landfill time, seasons, and presents tangible aperiodicity characteristics.Along with the prolongation of landfill time, COD progressively is reduced to below the 1000mg/L, and ammonia nitrogen then rises to about 2000mg/L gradually.
China has now and in the landfill yard of building, the percolate only a few is properly disposed.In the percolate of properly disposing, most accumulated with overflow, the in line current of going into physical environment or flowing through in, surrounding enviroment produced more and more seriously influence, public response is more and more stronger.
Administer in the puzzlement factor at many percolate, not having suitable treatment process technology is primary factor the most, in can not adapting to like the treatment facility of part landfill yard initial investment construction, late period the landfill yard change of water quality do not reach treatment effect gradually and stop transport; Also have the complicated cost of treatment facility operational management of part landfill yard investment construction high, be difficult to support lasting normal operation economically; There is not the suitable processing Technology cause to continue that operation cost is high, to need overlapping investment construction etc. all are principal elements that the puzzlement percolate is properly disposed.
Seek suitable percolate treating process technology, become the management goal that reaches new, solve the percolate disposal difficulties, the matter of utmost importance that must consider of suitable national environmental protection policy development.Develop percolate handled and reach discharging standards, investment and the cheap relatively treatment process of running cost are tasks that ten minutes is urgent of present stage percolate processing.
Summary of the invention
The objective of the invention is provides a kind of garbage leachate treatment process in order to overcome the weak point of above-mentioned background technology, and it can effectively be handled the percolate of different steps and all can stablize and reach emission standard.
A kind of garbage leachate treatment process may further comprise the steps successively:
(1) percolate is from flowing into equalizing tank, in equalizing tank, waste water carried out the adjusting of the water yield, water quality, and degraded partial C OD and ammonia nitrogen;
(2) equalizing tank waste water is pumped to coagulation-sedimentation equipment, in this equipment, earlier waste water is adjusted to PH3 ~ 4, adds coagulating agent and mix the back to precipitate in the settling region and scrape slag;
(3) the coagulation water outlet is flow automatically, and priority gets into iron-carbon micro-electrolysis equipment and preceding Fenton oxidation furnaces reacts; Organism in the waste water is oxidized reduction under the microbattery effect of iron powder and carbon dust formation earlier; Ferrous and the ydrogen peroxide 50 that adds of its generation is formed Fenton reagent; Generation has the hydroxyl radical free radical of high oxidizing potential, to the further redox of waste water;
(4) the waste water PH behind the senior catalytic oxidation is brought up to about 10; Heavy metal and the iron ion of deposition in the sewage pumps into the ammonia-nitrogen desorption tower with supernatant, utilize air with the ammonia nitrogen in high density stripping in the waste water to low concentration; Regulate waste water PH7 ~ 8, make it to be fit to biochemical treatment;
(5) through after the above-mentioned pre-treatment, waste water is introduced into anoxic pond from flowing into the combination biochemistry pool, regulates water quality, carries out denitrification process; Get into the ontozone biochemistry pool subsequently, arrange the ontozone in the said pond, add efficient composite bacteria, be aided with micro-pore aeration, biological bacteria is the raised growth breeding on ontozone surface, forms microbial film, in this step, is that the main pollutent overwhelming majority is removed with COD; Get into the BM nitrification tank then, drop into the BM filler in the said pond, add the high efficiency nitrification bacterium; Be aided with micro-pore aeration, nitrifier grows on the BM filler and hangs film, forms biological moving bed; Most ammonia nitrogens are converted to nitrous acid nitrogen, nitrate nitrogen in this step; This nitrification liquid gets into return-flow system, and be back to aforementioned anoxic pond and carry out denitrification, thus the degraded total nitrogen; Pollutents such as the COD of remainder also can further be removed at this;
(6) mud and the combination biochemistry pool excess sludge of transferring alkali to produce behind coagulating sedimentation mud, the senior catalyzed oxidation are collected into sludge thickener, pump into the belt filter press press filtration through spiral pump, and clear liquid is back to equalizing tank, and dried mud can be transported to the landfill yard sanitary landfill.
In technique scheme; Said waste water after the combination biochemical treatment reaches emission standard basically; For guaranteeing waste water qualified discharge under special circumstances; Fenton oxidation safeguard measure is set after biochemical treatment, and the secondary sedimentation water outlet is pumped to the Fenton oxidation trough and carries out the advanced oxidation reaction, and water outlet is handled through uv sterilisation again.
In technique scheme, said iron-carbon micro-electrolysis equipment is made up of reaction zone, settling region, reflux, whipping appts, and reaction zone links to each other with water-in, and the settling region links to each other with water outlet; Said reaction zone is formed highly different concentric columns in interior, settling region outside, bottom, settling region and the welding of reaction zone pool wall; The circular hole that is provided with 40 millimeters of a plurality of diameters in settling region and reaction zone joint portion is made return port, in reaction zone, is provided with whipping appts, and said reactor body structure adopts stainless steel plate to make; In reaction zone, be provided with in the wear-resistant plastic of being close to inwall and overlap, said reactor bottom is provided with the skirt that is used to support top, and skirt is provided with handle hole and stationary installation; Said whipping appts is fixed by the channel-section steel support that is welded on reaction zone, pool wall upper edge, settling region, is equipped with step-down gear, and stir shaft and agitating vane adopt stainless steel to make; Blade is straight blade profile; Tilt to install, whipping appts and frequency conversion system link, and said reactor drum also is provided with stainless steel bottom valve and blow-down pipe in the reaction zone bottom.
In technique scheme, three parts before, during and after said combination biochemistry pool is divided into, the fore portion pond is conventional anoxic pond; In establish diving mixer; Middle portion is the ontozone biochemistry pool, in the pond, arranges the ontozone, adds composite bacteria, and the rear portion is divided into the BM nitrification tank; In the pond, drop into BM filler and high efficiency nitrification bacterium, said ontozone biochemistry pool all links to each other with Blast mechanism with the BM nitrification tank.
In technique scheme; The bottom of said anoxic pond, ontozone biochemistry pool and BM nitrification tank is provided with the sludge pipe that is used to export mud; The output terminal of said sludge pipe links to each other with anoxic pond with sludge thickener respectively through sludge pump, and the mud output terminal of sludge thickener is connected to sludge dewatering mechanism.
The present invention compared with prior art has the following advantages:
1, adopts this technology can handle the percolate of different steps and all can stablize and reach emission standard.
This process using pre-treatment-biochemical treatment-aftertreatment pattern; At pretreatment stage percolate is adjusted; Guarantee that the pre-treatment stable water outlet is in certain scope; Favourable to the generate subsequent metallization processes, and make final outflow water to be up to state standards, the percolate of a whole set of technology ability suitable treatment different steps.
2, biological nitration stage orientation adds the conversion that nitrifier is strengthened ammonia nitrogen.
Another characteristics of this technology are through in the biological nitration pond, adding the high efficiency nitrification bacterium; Through improving the microorganism concn in the nitrification tank; Thereby improved ammonia nitrogen conversion rate and COD removal effect greatly, and realized that the short-cut denitrification of whole technology removes the purpose of total nitrogen, thereby practiced thrift cost.
3, the comprehensive method of investment and running cost are cheap relatively.
For percolate, adopt the cost of investment of this technology can be controlled at 5 ~ 60,000 yuan of/ton water, running cost is greatly about about 25 ~ 30 yuan of/ton water; For fresh landfill yard percolate, its working cost can significantly reduce when adopting this technology, greatly about about 5 yuan of/ton water.
Description of drawings
Fig. 1 is the processing flow chart of a kind of garbage leachate treatment process of the present invention.
Fig. 2 is the structural representation of iron-carbon micro-electrolysis conversion unit in the embodiment of the invention.
Fig. 3 is the structural representation of combination biochemistry pool in the embodiment of the invention.
Wherein: cover, 8 stainless steel bottom valves, 9 skirts, 10 handle holes, 11 blow-down pipes, 12 anoxic pond, 13 ontozone biochemistry pools, 14BM nitrification tank, 15 diving mixers, 16 Blast mechanisms, 17 ontozones, 18BM filler, 19 sludge pipes in 1 water-in, 2 reaction zones, 3 whipping apptss, 4 settling regions, 5 water outlets, 6 return ports, 7 wear-resistant plastics.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further described.
As shown in Figure 1, present embodiment provides a kind of garbage leachate treatment process, may further comprise the steps successively:
(1) percolate is from flowing into equalizing tank, in equalizing tank, waste water carried out the adjusting of the water yield, water quality, and the COD and the ammonia nitrogen of degraded considerable part;
(2) equalizing tank waste water is pumped to coagulation-sedimentation equipment; In this equipment; Earlier waste water is adjusted to about PH4; Add coagulating agent and mix the back and precipitate in the settling region and scrape slag, waste water is precipitated with scum silica frost with the colloidal type organism through a large amount of suspended states behind this equipment to be taken away, and colourity is by significantly reduction;
(3) the coagulation water outlet is flow automatically, and priority gets into iron-carbon micro-electrolysis equipment and preceding Fenton oxidation furnaces reacts; Its ultimate principle is iron-carbon micro-electrolysis reaction and Fenton oxidizing reaction, and the organism in the waste water is oxidized reduction under the microbattery effect of iron powder and carbon dust formation earlier, and the ferrous and ydrogen peroxide 50 that adds of its generation is formed Fenton reagent; Can produce hydroxyl radical free radical with high oxidizing potential; To the further redox of waste water, after iron-carbon micro-electrolysis and Fenton oxidation, the hardly degraded organic substance in the waste water is by effectively degraded; Colourity obtains removing, and the biodegradability of waste water also is enhanced simultaneously;
(4) waste water PH behind the senior catalytic oxidation is brought up to about 10; Heavy metal and the iron ion of deposition in the sewage pumps into the ammonia-nitrogen desorption tower with supernatant, utilize air with the ammonia nitrogen in high density stripping in the waste water to low concentration; Regulate waste water PH 7 ~ 8, make it to be fit to biochemical treatment;
(5) through after the above-mentioned pre-treatment, waste water is introduced into anoxic pond from flowing into the combination biochemistry pool, regulates water quality, carries out denitrification process; Get into the ontozone biochemistry pool subsequently, arrange the ontozone in the said pond, add composite bacteria, be aided with micro-pore aeration, biological bacteria is the raised growth breeding on ontozone surface, forms microbial film, in this step, is that the main pollutent overwhelming majority is removed with COD; Get into the BM nitrification tank then, drop into the BM filler in the said pond, add the high efficiency nitrification bacterium; Be aided with micro-pore aeration, nitrifier grows on the BM filler and hangs film, forms biological moving bed; Most ammonia nitrogens are converted to nitrous acid nitrogen, nitrate nitrogen in this step; This nitrification liquid gets into return-flow system, and be back to aforementioned anoxic pond and carry out denitrification, thus the degraded total nitrogen; Pollutents such as the COD of remainder also can further be removed at this; Said efficient composite bacteria by bacillus, nitrobacteria, denitrifying bacterium, short-cut denitrification bacterium, polyP bacteria, phenol bacterium, more than 300 kind of composite floras that bacterial strain is formed such as decolouring bacterium etc. fall.The viable count of every gram product is up to hundred million of hundreds ofs, and existence under the differing temps environment can suit; Said high efficiency nitrification bacteria agent is to utilize contaminant degradation mikrobe from the nature screening and separating as bacterial classification; Cooperate the microbiobacterial agent product that forms through biotechnology enlarged culturing and compound, its composition mainly is Nitrosomonas, nitrosification coccus, nitrosification vibrios, nitrosification bacillus, nitrated Zymomonas mobilis, nitrated coccus, nitrated vibrios, bacterium nitrobacter, nutritive salt etc.;
(6) waste water after the biochemical treatment reaches emission standard basically; For guaranteeing waste water qualified discharge under special circumstances; Present embodiment is provided with Fenton oxidation safeguard measure behind biochemical system; The secondary sedimentation water outlet is pumped to the Fenton oxidation trough and carries out the advanced oxidation reaction, and water outlet is handled back each item index through uv sterilisation all can guarantee the emission standard of marking up to standard.
As shown in Figure 2, in the above-described embodiments, said iron-carbon micro-electrolysis conversion unit is made up of reaction zone 2, settling region 4, reflux 6, whipping appts 3, and reaction zone 2 links to each other with water-in 1, and settling region 4 links to each other with water outlet 5; Said reaction zone 2 is formed highly different concentric columns in interior, settling region 4 outside, and suspension iron powder carbon fully reacts at reaction zone 2 and acid waste water, and the iron powder carbon that carries in the waste water that has reacted 4 precipitates in the settling region.4 bottoms, settling region and the welding of reaction zone 2 pool walls; In the settling region 4 be provided with 40 millimeters of a plurality of diameters with reaction zone 2 joint portions circular hole make return port 6; The iron powder carbon that is beneficial to be deposited in the settling region relies on self gravitation to be back to reaction zone to continue to participate in reaction; In reaction zone 2, be provided with whipping appts 3, make the iron powder carbon in the waste water be in suspended state, react fully and carry out.
Said conversion unit agent structure adopts stainless steel plate to make, and in reaction zone 2, is provided with in the replaceable wear-resistant plastic of being close to inwall and overlaps 7, alleviates the wearing and tearing of reaction pair stainless steel inwall, improves the whole service life of equipment.Reactor bottom is provided with the skirt 9 that is used to support top, and skirt 9 is provided with the handle hole 10 and the stationary installation that is used for fixing whole reactor of maintenance usefulness.Said reactor drum is provided with stainless steel bottom valve 8 and blow-down pipe 11 in reaction zone bottom, when being used to overhaul with device interior emptying.
Said whipping appts 3 is fixed by the channel-section steel support that is welded on reaction zone 2,4 pool wall upper edges, settling region, is equipped with step-down gear, and stir shaft and agitating vane adopt stainless steel to make; Blade is straight blade profile; Tilt to install, whipping appts and frequency conversion system link, and stirring velocity adopts frequency conversion system to control.
As shown in Figure 3, in the above-described embodiments, three parts before, during and after said combination biochemistry pool is divided into; The fore portion pond is conventional anoxic pond 12, in establish diving mixer 15, middle portion is an ontozone biochemistry pool 13; In the pond, arrange ontozone 17, add efficient composite bacteria; The rear portion is divided into BM nitrification tank 14, in the pond, drops into BM filler 18 and high efficiency nitrification bacterium, and said ontozone biochemistry pool all links to each other with Blast mechanism 16 with the BM nitrification tank.
In the above-described embodiments; The bottom of said anoxic pond 12, ontozone biochemistry pool 13 and BM nitrification tank 14 is provided with the sludge pipe 19 that is used to export mud; The output terminal of said sludge pipe 19 links to each other with anoxic pond with sludge thickener respectively through sludge pump, and the mud output terminal of sludge thickener is connected to sludge dewatering mechanism.
In the above-described embodiments; Mud and the secondary sedimentation excess sludge of transferring alkali to produce behind coagulating sedimentation mud, the senior catalyzed oxidation also are collected into sludge thickener; Pump into the belt filter press press filtration through spiral pump, clear liquid is back to equalizing tank, and dried mud can be transported to the landfill yard sanitary landfill.
Claims (5)
1. garbage leachate treatment process is characterized in that this method may further comprise the steps successively:
(1) percolate is from flowing into equalizing tank, in equalizing tank, waste water carried out the adjusting of the water yield, water quality, and degraded partial C OD and ammonia nitrogen;
(2) equalizing tank waste water is pumped to coagulation-sedimentation equipment, in this equipment, earlier waste water is adjusted to pH 3 ~ 4, adds coagulating agent and mix the back to precipitate in the settling region and scrape slag;
(3) the coagulation water outlet is flow automatically, and priority gets into iron-carbon micro-electrolysis equipment and preceding Fenton oxidation furnaces reacts; Organism in the waste water is oxidized reduction under the microbattery effect of iron powder and carbon dust formation earlier; Ferrous and the ydrogen peroxide 50 that adds of its generation is formed Fenton reagent; Generation has the hydroxyl radical free radical of high oxidizing potential, to the further redox of waste water;
(4) wastewater pH behind the senior catalytic oxidation is brought up to 10; Heavy metal and the iron ion of deposition in the sewage pumps into the ammonia-nitrogen desorption tower with supernatant, utilize air with the ammonia nitrogen in high density stripping in the waste water to low concentration; Regulate wastewater pH 7 ~ 8, make it to be fit to biochemical treatment;
(5) through after the above-mentioned pre-treatment, waste water is introduced into anoxic pond from flowing into the combination biochemistry pool, regulates water quality, carries out denitrification process; Get into the ontozone biochemistry pool subsequently, arrange the ontozone in the said pond, add composite bacteria, be aided with micro-pore aeration, biological bacteria is the raised growth breeding on ontozone surface, forms microbial film, in this step, is that the main pollutent overwhelming majority is removed with COD; Get into the BM nitrification tank then, drop into the BM filler in the said pond, add the high efficiency nitrification bacterium; Be aided with micro-pore aeration, nitrifier grows on the BM filler and hangs film, forms biological moving bed; Most ammonia nitrogens are converted to nitrous acid nitrogen, nitrate nitrogen in this step; This nitrification liquid gets into return-flow system, and be back to aforementioned anoxic pond and carry out denitrification, thus the degraded total nitrogen; The COD pollutent of remainder also can further be removed at this;
(6) mud and the combination biochemistry pool excess sludge of transferring alkali to produce behind coagulating sedimentation mud, the senior catalyzed oxidation are collected into sludge thickener, pump into the belt filter press press filtration through spiral pump, and clear liquid is back to equalizing tank, and dried mud is transported to the landfill yard sanitary landfill.
2. garbage leachate treatment process according to claim 1 is characterized in that: said iron-carbon micro-electrolysis equipment is made up of reaction zone, settling region, reflux, whipping appts, and reaction zone links to each other with water-in, and the settling region links to each other with water outlet; Said reaction zone is formed highly different concentric columns in interior, settling region outside, bottom, settling region and the welding of reaction zone pool wall; The circular hole that is provided with 40 millimeters of a plurality of diameters in settling region and reaction zone joint portion is made return port, in reaction zone, is provided with whipping appts, and said iron-carbon micro-electrolysis equipment body structure adopts stainless steel plate to make; In reaction zone, be provided with in the wear-resistant plastic of being close to inwall and overlap; Said iron-carbon micro-electrolysis device bottom is provided with the skirt that is used to support top, and skirt is provided with handle hole and stationary installation, and said whipping appts is fixed by the channel-section steel support that is welded on reaction zone, pool wall upper edge, settling region; Be equipped with step-down gear; Stir shaft and agitating vane adopt stainless steel to make, and blade is straight blade profile, tilt to install; Whipping appts and frequency conversion system link, and said iron-carbon micro-electrolysis equipment also is provided with stainless steel bottom valve and blow-down pipe in the reaction zone bottom.
3. garbage leachate treatment process according to claim 1 is characterized in that: in the said ammonia-nitrogen desorption, the ammonia nitrogen in the water is many with ammonium ion (NH
4 +) and free ammonia NH
3State exist, both also keep balance, concern to be NH
4 ++ OH
-NH
3+ H
2O, when the pH value is 10, the ratio that free ammonia accounts for increases, and this moment is aeration stripping in addition, impels ammonia from water, to overflow, and the ammonia of effusion gets into the absorption tower, generates ammonium sulfate with dilute sulphuric acid.
4. garbage leachate treatment process according to claim 1 is characterized in that: three parts before, during and after said combination biochemistry pool is divided into, fore portion pond are conventional anoxic pond; In establish diving mixer; Middle portion is the ontozone biochemistry pool, in the pond, arranges the ontozone, adds efficient composite bacteria, and the rear portion is divided into the BM nitrification tank; In the pond, drop into BM filler and high efficiency nitrification bacterium, said ontozone biochemistry pool all links to each other with Blast mechanism with the BM nitrification tank; Said efficient composite bacteria by bacillus, nitrobacteria, denitrifying bacterium, short-cut denitrification bacterium, polyP bacteria, phenol bacterium, the composite flora formed of decolouring bacterium fall, the viable count of every gram product can suit under the differing temps environment, to survive up to hundred million of hundreds ofs; Said high efficiency nitrification bacteria agent is to utilize contaminant degradation mikrobe from the nature screening and separating as bacterial classification, cooperates the microbiobacterial agent product that forms through biotechnology enlarged culturing and compound; Its composition mainly is Nitrosomonas, nitrosification coccus, nitrosification vibrios, nitrosification bacillus, nitrated Zymomonas mobilis, nitrated coccus, nitrated vibrios, bacterium nitrobacter, nutritive salt.
5. garbage leachate treatment process according to claim 4; It is characterized in that: the bottom of said anoxic pond, ontozone biochemistry pool and BM nitrification tank is provided with the sludge pipe that is used to export mud; The output terminal of said sludge pipe links to each other with anoxic pond with sludge thickener respectively through sludge pump, and the mud output terminal of sludge thickener is connected to sludge dewatering mechanism.
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| CN101774726A (en) * | 2009-08-25 | 2010-07-14 | 上海市固体废物处置中心 | Percolate biology physical and chemical treatment device of municipal solid waste landfill |
| CN101665311A (en) * | 2009-09-24 | 2010-03-10 | 中南大学 | Catalysis and micro-electrolysis combined technology for high-concentration refractory organic wastewater |
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