CN101767877A - Microaerophilic recirculation treatment method for membrane-separation concentrated solution of garbage leachate - Google Patents
Microaerophilic recirculation treatment method for membrane-separation concentrated solution of garbage leachate Download PDFInfo
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- CN101767877A CN101767877A CN201010045628A CN201010045628A CN101767877A CN 101767877 A CN101767877 A CN 101767877A CN 201010045628 A CN201010045628 A CN 201010045628A CN 201010045628 A CN201010045628 A CN 201010045628A CN 101767877 A CN101767877 A CN 101767877A
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Abstract
The invention relates to a microaerophilic recirculation treatment method for a membrane-separation concentrated solution of garbage leachate, which comprises the following steps: the concentrated solution is uniformly distributed on the surface layer of the recirculation area via an overhead tank and water distribution pipes, and discharged into a drain pipe via an overlaid soil layer, a garbage landfill layer and a pebble layer; and a forced draft is introduced into the recirculation area to accelerate the organic matters in the concentrated solution and garbage to decompose, and the concentrated solution is finally discharged into a stabilization pond. Since the landfill layer provides a microaerophillic environment, acid fermentation, high concentration and organic acid accumulation are inhibited, thereby accelerating the removal of COD and NH3-N; and the abundant microbial populations in the landfill layer is beneficial to the degradation and stabilization of the landfill layer. Thus, the invention has strong capability for resisting hydraulic load variations and favorable recirculation treatment effect on the concentrated solution.
Description
Technical field
The invention belongs to a kind of little aerobic treatment process of recharging of rubbish percolation liquid membrane separation concentrated solution.
Background technology
China's domestic waste mainly takes the method for sanitary landfill to handle at present, the landfill process produces the organic concentration height of a large amount of percolates, complicated component, hazardous and noxious substances is many, traditional anaerobism+aerobe handles, be aided with physico-chemical processeses such as charcoal absorption, chemical precipitation, chemical oxidation carries out advanced treatment, is difficult to reach the emission request of " consumer waste filling and embedding pollution control criterion " GB16889-2008.Major cause is that the percolate ammonia nitrogen concentration is too high, and biodegradability is poor, and especially dry season and landfill later stage, ammonia nitrogen concentration is up to more than the 2000mg/L, COD/NH
3-N is near 1.0, and BOD/COD causes the biochemical system collapse near 0.1, and follow-up physico-chemical processes treatment system can't normally be moved.
Compare with biochemical process, membrane separation technique influences clear superiorities such as little, stable effluent quality and floor space be little having the raw water quality of being subjected to aspect the treating refuse percolate.External widespread use membrane separation process treating refuse percolate, along with the improvement of mould material and the raising of film groundwater pollution control, membrane technique percolate at home progressively finds application in handling, and can make the be up to state standards emission request of GB16889-2008 of water outlet.
To dry season and the landfill later stage percolate water quality characteristic that " wears out ", adopt porous ceramic micro filter film+secondary low pressure reverse osmosis device treatment process, can solve the difficult problem that above-mentioned traditional treatment process can not qualified discharge.
The inevitable association concentrated solution of membrane separation process treating refuse percolate, the generation that membrane sepn concentrates liquid is 1/3～1/4 of a percolate, its COD and specific conductivity be 3～4 times of primary percolate often.At present both at home and abroad the treatment process of garbage filter concentrated liquor recharge, burn, curing and evaporation drying etc., wherein burn, method processing costs such as curing and evaporation drying are very expensive, seldom be used.And concentrated solution recharges facture owing to can promote the stabilization of landfill waste, has been used as an integral part of reverse osmosis method treating refuse percolate and is widely adopted.Concentrated solution recharges facture and mainly refers to reverse osmosis method is handled the concentrated solution that produces, and recharges to the specific zone of refuse landfill, under anaerobic with the organic natural degradation in the rubbish.Remain in following problems but recharge under the anaerobic condition to handle at present:
1, recharge carry out of initial stage along with degraded, the oxygen that waste layer Central Plains is contained is consumed and finishes, and in degradation process subsequently, because organic hydrolysis acid production, organic acid accumulates in a large number in the percolate, is unfavorable for COD, NH
3The removal of-H.
2, along with the increase of the time of recharging, garbage loading embeading layer subsidence rate slowed down, and porosity reduces gradually, causes the oxygen deficiency to influence nitration reaction, and along with the increase of soil landfill layer adsorptive capacity, it is saturated to reach absorption gradually, makes water outlet NH
3-N accumulation, concentration obviously raises, and is unfavorable for subsequent disposal.
Therefore how effectively controlling the accumulation of concentrated solution organic acid and ammonia nitrogen in recharging treating processes, is a difficult problem during the concentrated solution recharging technique is used.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of little aerobic treatment process of recharging of rubbish percolation liquid membrane separation concentrated solution.
The present invention solves the problems of the technologies described above with following technical scheme:
Little aerobic treatment system of recharging comprises that header tank, water distributor, garbage loading embeading floor recharge district, ventilation system, water exhaust system; The step of recharging processing is:
(1) the rubbish percolation liquid membrane separation concentrated solution that recharges utilizes gravity to enter water distributor through header tank, is uniformly distributed in garbage loading embeading by surface sprinkling and recharges the top layer, district; Material moisture is less than 70% in the landfill unit;
(2) the garbage loading embeading floor recharges the bottom, district and lays one deck cobble, landfill waste on pebble bed; The top of this garbage loading embeading layer and middle part have the overburden layer of a bed thickness 4～7cm respectively, and temperature-detecting device is arranged respectively at middle part and bottom.The percolate that recharges is flowed through from top to down and is entered the drainage collection pipe behind overburden layer, garbage loading embeading layer and the pebble bed;
(3) adopt and just to press to the garbage loading embeading floor and recharge district's forced ventilation, by gas flow regulating valve control air demand, make air recharge district's diffusion at the landfill floor by airway, be beneficial to the formation of pore in the landfill layer, quicken concentrated solution and the oxygenolysis of recharging organic substance in district's rubbish, the heat that produces rises landfill layer temperature, can also dispel the heat effectively and transpiring moisture; The temperature of landfill layer remains on 30～40 ℃;
(4) treated percolate enters the percolate stabilization pond by the drainage collection pipe.
The operating parameter of recharging employing is: when recharging the initial stage, recharge frequency and remain on 3～4 times/d, hydraulic load is controlled at 12.5mL/ (Ld)～37.5mL/ (Ld), and air demand is controlled at 0.03L/ (minkg)～0.06L/ (minkg); Different zones in the landfill layer is that biological species forms gradually and quantity increases and tends towards stability, and water outlet COD reduces to below 4000, NH
3-H reduces to 400 when following, and recharge frequency and should remain on 2～3 times/d this moment, and hydraulic load is controlled at 37.5mL/ (Ld)～75.0mL/ (Ld), and air demand is controlled at 0.06L/ (minkg)～0.10L/ (minkg).
The present invention compared with prior art has the following advantages:
1, because the landfill layer is in little oxygen environment, shortened the rubbish acid fermentation stage, the percolate that has suppressed high density produces, and avoids having quickened COD and NH recharging organic acid accumulation phenomenon in early stage
3The removal of-N.
2, because stable aerobic, hold concurrently oxygen, the anaerobic zone of inner each self-forming of different zones of little aerobic landfill layer, microbial population is abundant, can quicken garbage degradation, suppresses gases such as methane, hydrogen sulfide and produces, and more helps the degraded of landfill layer and stable.
3, avoided anaerobism to recharge because of the not enough ammonia that occurs of later stage oxygen supply accumulates problem, forced ventilation has reduced the concentration of ammonia in the percolate again, and the recycling mode of surface spraying has also increased NH
3The volatilization of-N.
4, biotic population is abundant and quantity is more in little aerobic landfill, and temperature is than anaerobism landfill height in the aerobic landfill, and landfill layer moisture evaporation is very fast, and the ability that anti-hydraulic load changes is stronger.
Description of drawings
Fig. 1 is the little aerobic treatment system testing apparatus figure that recharges of rubbish percolation liquid membrane separation concentrated solution of the present invention
Embodiment
The little aerobic treatment system of recharging of rubbish percolation liquid membrane separation concentrated solution of the present invention is recharged district, ventilation system, water exhaust system by header tank, water distributor, garbage loading embeading floor and is formed, and is specially adapted to newly-built garbage loading embeading district.The garbage filter concentrated liquor of high density, high ammonia nitrogen, bio-refractory is recharged little aerobic treatment system to refuse landfill, and concentrated solution recharges the organism that can help to dissolve on the one hand in the rubbish, participates in the metabolism of garbage loading embeading process microorganism; Portion water branch and landfill layer heat are taken away in temperature rising evaporation in the rubbish oxygenolysis on the other hand.The present invention carries out micro-oxygen supply with the malleation forced ventilation, in conjunction with the advantage of garbage loading embeading anaerobic treatment process, from the biological denitrification process of heating power and biochemical aspect reinforcement concentrated solution.
The little aerobic treatment system of recharging of rubbish percolation liquid membrane separation concentrated solution of the present invention, the effect of header tank and water distributor are to utilize gravity will recharge concentrated solution evenly to be sprayed on the garbage loading embeading top layer, to guarantee the rubbish synchronism stabilityization of each garbage loading embeading layer region.Recharge district's void volume minimizing for avoiding moisture to spray the excessive garbage loading embeading floor that causes, should control the concentrated solution input, material moisture should be not more than 70% in the landfill unit.
Recharge the district at the garbage loading embeading floor, a pebble bed 11 is arranged between the porose gas distribution pipe 6 of bottom and the drainage collection pipe 7, stop up, make gas distribution even to prevent ventilation system and water exhaust system.Landfill waste layer 5 on pebble bed.The landfill waste floor recharges the overburden layer 12 that district top and middle part cover a bed thickness 4～7cm respectively, and middle part and bottom are respectively arranged with temperature-detecting device.
Ventilation system comprises airway 4, porose gas distribution pipe 6, gas flow regulating valve 9 and gas blower 10.Air recharges the district by airway 4 at the landfill floor and spreads, and carries out the malleation forced ventilation to the garbage loading embeading layer, by gas flow regulating valve 9 control air demands.The malleation forced ventilation helps the formation of pore in the landfill layer, quickens concentrated solution and recharges organic substance oxygenolysis in district's rubbish, and produced simultaneously heat causes landfill layer temperature to rise, and can also dispel the heat effectively and transpiring moisture.If yet landfill layer temperature is too high, the microorganism that participates in biochemical reaction is suppressed even deactivation, will have a strong impact on the organic substance oxygenolysis.Should make temperature remain on 30～40 ℃ and be advisable by the control wind supply quantity.Draft type can be controlled according to temperature, can be by being arranged on the temperature feedback system that the garbage loading embeading floor recharges middle part, district and bottom, and when temperature surpassed 50 ℃, gas blower was started working, and discharged heat and water vapour, and landfill layer temperature descended.Also can adopt regularly airy mode controlled temperature.
Water exhaust system comprises drainage collection pipe 7, percolate stabilization pond 8.The drainage collection pipe is positioned at porose gas distribution pipe below, should be able to drain ponding and percolate rapidly.
In recharging special-purpose landfill yard, be provided with the impervious barrier identical with other landfill units.Recharge the concentrated solution reply landfill layer stabilization of fully degrading.Recharge the initial stage, population of microorganism and comparatively small amt, recharge number of times what directly have influence on the residence time of concentrated solution in the garbage loading embeading layer, it is also just long more to recharge many more residence time of number, make microorganism can not carry out fully effectively degraded to organic matter wherein, recharge frequency and can remain on 3～4 times/d, hydraulic load should be controlled at: 12.5mL/ (Ld)～37.5mL/ (Ld); Air demand is controlled at: 0.03L/ (minkg)～0.06L/ (minkg).Hydraulic load and air demand increase gradually along with the prolongation of the time of recharging, and the different zones in the landfill layer is that biological species forms gradually and quantity increases and tends towards stability, and water outlet COD reduces to below 4000, NH
3-H reduces to 400 when following, and recharge frequency and should remain on 2～3 times/d this moment, and the frequency is too high to be unfavorable for drawing of landfill gas in the apposition growth of microorganism and the waste layer, causes the flow area to reduce, and reduces contacting of water and microorganism, influences garbage degradation.Simultaneously, hydraulic load is controlled at 37.5mL/ (Ld)～75.0mL/ (Ld), and air demand is controlled at: 0.06L/ (minkg)～0.10L/ (minkg).Recharging the interior temperature of special-purpose landfill layer can be at 30～40 ℃.
The embodiment of treatment process of the present invention is described below in conjunction with Fig. 1:
Embodiment 1:
Testing apparatus is simulated the garbage loading embeading unit of leachate recirculation as shown in Figure 1 with Φ 350 * 700mm drum.Filling rubbish 60Kg in the device, rubbish derives from the municipal wastes transhipment station.Recharging district top and middle part establishes one respectively and thickly is the overburden layer of 50mm.Recharge concentrated solution and regulate hydraulic load by feed liquor valve 2 from header tank 1, evenly be sprayed at the garbage loading embeading top layer by water distributor 3, twice seepage flow of concentrated solution passes overburden layer 12 and garbage loading embeading layer 5 successively, after the synergies such as the filtration of carrying out organic pollutant is held back, physical adsorption, electroless plating, biological degradation, the final drainage collection pipe 7 that imports the bottom flows to percolate stabilization pond 8.Gas blower 10 passes through porose gas distribution pipe 6 at bottom cobble packing layer 11 even gas distributions with air, by gas flow regulating valve 9 control air demands, makes landfill layer temperature remain on 30～40 ℃.The effect of airway 4 is to carry out the air conducting diffusion at the landfill layer, helps the formation of pore in the landfill layer, quickens concentrated solution and recharges organic substance oxygenolysis in district's rubbish.Adopt air quantity constant operation mode, realize the little oxygen of environment.
Recharge the initial stage hydraulic load and be controlled at 37.5mL/ (Ld) by water intaking valve 2; Air demand is controlled at 0.03L/ (minkg) by gas flow regulating valve 9, when water outlet COD reduces to below 4000, NH
3-H reduces to 400 when following, and hydraulic load is controlled at 75.0mL/ (Ld) by water intaking valve 2, and air demand is controlled at 0.06L/ (minkg) by gas flow regulating valve 9.Under the certain situation of hydraulic load, the initial stage is recharged frequency: 4 times/d; Middle and later periods is recharged frequency: 3 times/d.Concrete testing data is as follows:
Embodiment 2:
Other are with embodiment 1, and difference is to recharge the initial stage hydraulic load and is controlled at 12.5mL/ (Ld), and air demand is controlled at 0.06L/ (minkg); When water outlet COD reduces to below 4000 NH
3-H reduces to 400 when following, and hydraulic load is controlled at 37.5mL/ (Ld), and air demand is controlled at 0.10L/ (minkg).Concrete testing data is as follows:
Embodiment 3:
Other are with embodiment 1, and difference is that the initial stage is recharged frequency: 3 times/d; Middle and later periods is recharged frequency: 2 times/d.Concrete testing data is as follows:
Claims (2)
1. the little aerobic treatment process of recharging of a rubbish percolation liquid membrane separation concentrated solution is characterized in that little aerobic treatment system of recharging comprises that header tank, water distributor, garbage loading embeading floor recharge district, ventilation system, water exhaust system; The step of recharging processing is:
(1) the rubbish percolation liquid membrane separation concentrated solution that recharges utilizes gravity to enter water distributor through header tank, is uniformly distributed in garbage loading embeading by surface sprinkling and recharges the top layer, district; Material moisture is less than 70% in the landfill unit;
(2) the garbage loading embeading floor recharges the bottom, district and lays one deck cobble, landfill waste on pebble bed; The top of this garbage loading embeading layer and middle part have the overburden layer of a bed thickness 4～7cm respectively, and temperature-detecting device is arranged respectively at middle part and bottom.The percolate that recharges is flowed through from top to down and is entered the drainage collection pipe behind overburden layer, garbage loading embeading layer and the pebble bed;
(3) adopt and just to press to the garbage loading embeading floor and recharge district's forced ventilation, by gas flow regulating valve control air demand, make air recharge district's diffusion at the landfill floor by airway, be beneficial to the formation of pore in the landfill layer, quicken concentrated solution and the oxygenolysis of recharging organic substance in district's rubbish, the heat that produces rises landfill layer temperature, can also dispel the heat effectively and transpiring moisture; The temperature of landfill layer remains on 30～40 ℃;
(4) treated percolate enters the percolate stabilization pond by the drainage collection pipe.
2. the little aerobic treatment process of recharging of rubbish percolation liquid membrane separation concentrated solution as claimed in claim 1, it is characterized in that the operating parameter of recharging employing is: when recharging the initial stage, recharge frequency and remain on 3～4 times/d, hydraulic load is controlled at 12.5mL/ (Ld)～37.5mL/ (Ld), and air demand is controlled at 0.03L/ (minkg)～0.06L/ (minkg); Different zones in the landfill layer is that biological species forms gradually and quantity increases and tends towards stability, and water outlet COD reduces to below 4000, NH
3-H reduces to 400 when following, and recharge frequency and should remain on 2～3 times/d this moment, and hydraulic load is controlled at 37.5mL/ (Ld)～75.0mL/ (Ld), and air demand is controlled at 0.06L/ (minkg)～0.10L/ (minkg).
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| CN103922488A (en) * | 2014-05-06 | 2014-07-16 | 常州市生活废弃物处理中心 | Concentrated liquor recharging technology |
| CN104259173A (en) * | 2014-07-23 | 2015-01-07 | 浙江工商大学 | H2S endogenesis cutting-down method and device of quasi aerobic landfill |
| CN104275343A (en) * | 2014-10-21 | 2015-01-14 | 华新水泥股份有限公司 | Garbage-drying and deodorization and percolate-disposing system and method |
| CN105127174A (en) * | 2015-10-20 | 2015-12-09 | 南京大学 | Circulating sustainable domestic waste landfill site and treatment method thereof |
| CN106799385A (en) * | 2017-01-21 | 2017-06-06 | 江翠珍 | A kind of municipal refuse environment-friendly disposal system |
| CN107876539A (en) * | 2017-10-17 | 2018-04-06 | 南京中电环保工程有限公司 | The aerobic Ecosystem restoration system of refuse landfill and method |
| CN109174926A (en) * | 2018-10-31 | 2019-01-11 | 湖南新九方科技有限公司 | A kind of consumer waste filling and embedding method |
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| CN100491275C (en) * | 2006-11-30 | 2009-05-27 | 湖南大学 | Circulated backfilling and artificial wetland combined leachate processing method and its facility |
| CN100569676C (en) * | 2007-11-23 | 2009-12-16 | 陈伟雄 | A kind of treatment process of percolate |
| CN101249988B (en) * | 2008-03-27 | 2011-08-10 | 清华大学 | Method for processing landfill leachate and special device thereof |
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| CN103922488A (en) * | 2014-05-06 | 2014-07-16 | 常州市生活废弃物处理中心 | Concentrated liquor recharging technology |
| CN103922488B (en) * | 2014-05-06 | 2016-01-20 | 常州市生活废弃物处理中心 | A kind of Concentrated liquid recharge technique |
| CN104259173A (en) * | 2014-07-23 | 2015-01-07 | 浙江工商大学 | H2S endogenesis cutting-down method and device of quasi aerobic landfill |
| CN104275343A (en) * | 2014-10-21 | 2015-01-14 | 华新水泥股份有限公司 | Garbage-drying and deodorization and percolate-disposing system and method |
| CN105127174A (en) * | 2015-10-20 | 2015-12-09 | 南京大学 | Circulating sustainable domestic waste landfill site and treatment method thereof |
| CN106799385A (en) * | 2017-01-21 | 2017-06-06 | 江翠珍 | A kind of municipal refuse environment-friendly disposal system |
| CN107876539A (en) * | 2017-10-17 | 2018-04-06 | 南京中电环保工程有限公司 | The aerobic Ecosystem restoration system of refuse landfill and method |
| CN109174926A (en) * | 2018-10-31 | 2019-01-11 | 湖南新九方科技有限公司 | A kind of consumer waste filling and embedding method |
| CN111112275A (en) * | 2019-11-27 | 2020-05-08 | 同济大学 | Sanitary landfill covering method for domestic garbage in loess area |
| CN111112275B (en) * | 2019-11-27 | 2022-05-27 | 同济大学 | Sanitary landfill covering method for domestic garbage in loess area |
| CN112830573A (en) * | 2021-03-24 | 2021-05-25 | 三亚易可霖环保科技有限公司 | On-site treatment equipment for landfill leachate |
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