CN103570175B - Method for processing percolate membrane treatment concentrated solution of waste incineration plant - Google Patents
Method for processing percolate membrane treatment concentrated solution of waste incineration plant Download PDFInfo
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Abstract
The invention discloses a method for processing a percolate membrane treatment concentrated solution of a waste incineration plant. The method comprises steps of adding an alkali into the percolate membrane treatment concentrated solution of the waste incineration plant, and reacting to obtain a mixed liquor containing precipitate; micro-filtering the mixed liquor to obtain a first permeating liquor and a closure liquor; press-filtering for dehydrating the closure liquor through a plate frame to obtain a second permeating liquor and mud cakes, returning the second permeating liquor to the alkali adding step for recycling, and solidifying the mud cakes; adding an acid into the first permeating liquor, regulating pH to be 6-9, and then desalting the first permeating liquor through electrodialysis to obtain electrodialysis fresh water and electrodialysis thick water; carrying out evaporative crystallizing on the electrodialysis thick water, and concentrating the electrodialysis fresh water through reverse osmosis to obtain a third permeating liquor and a concentrated liquor; directly discharging the third permeating liquor, and drying and solidifying the concentrated liquor. The method is simple, has good processing effect, and high recovery rate of the percolate membrane concentrated solution of the waste.
Description
Technical field
The invention belongs to technical field of sewage, particularly relate to a kind of method for the treatment of refuse incineration leachate film process concentrated solution.
Background technology
In recent years, due to giving prominence to further of environmental problem, municipal wastes causes the attention of each relevant departments and scientific research institution, the comprehensive regulation level of domestic waste obtains significant raising, domestic waste is just according to based on minimizing, turn to main body with harmless, turn to the waste control basic principle steady progression of target with resource.With regard to present Research, innoxious process for treating mainly comprises waste incineration method, compost fermentation facture and sanitary landfill.
Except smoke pollution etc. needs to carry out to control and dispose, equally also there is the problem of percolate in waste incineration method.This is the waste water that a kind of change of water quality is large, complicated component, organic concentration are high, ammonia-nitrogen content is high, saltiness is high, soil ulmin concentration is high, and intractability is very large.The processing mode of percolate mainly contains the method for recharging, physico-chemical process, biochemical process etc.Along with the raising of national requirements for environmental protection, the percolate treatment facility of current domestic built employing conventional treatment process, after its process, water outlet all can not meet the requirement of " GB16889-2008 household refuse landfill sites Environmental capacity standard ".
At present, the most effective treatment process of percolate is biochemical process+film process, but the concentrated solution water yield that membrane treatment process produces is larger, and concentrated solution belongs to the organic waste water of high density, difficult for biological degradation, intractability is large, limits the biochemical process+application & development of film process process integration in landfill leachate treatment.
The main methods of current garbage burning factory percolation liquid membrane process concentrated liquid is back spray and evaporation.Return the situation that spray can make incinerator fire box temperature too low, even flame-out; Method of evaporation because energy consumption is high, apparatus expensive and equipment loss is serious, be temporarily difficult to promote, in addition, as concentrated solution is directly evaporated or spraying dry because of in concentrated solution containing middle salt and organism, can make vaporizer and spray-dryer hardens, heat transfer coefficient declines, inefficiency, finally causes processing.Therefore, there is no the method for effective treating refuse incineration leachate film process concentrated solution so far.
Summary of the invention
The invention provides a kind of method for the treatment of refuse incineration leachate film process concentrated solution, technique is simple, practical, and treatment effect is good, improves the rate of recovery of rubbish percolation liquid membrane concentrated solution.
A method for treating refuse incineration leachate film process concentrated solution, comprising:
(1) alkali is added in garbage burning factory percolation liquid membrane process concentrated liquid react, obtain the mixed solution containing precipitation;
(2) micro-filtration is carried out to described mixed solution, obtain the first permeate and the liquid that dams;
(3) carry out filter press dehydration to described trapped fluid, obtain the second permeate and mud cake, described second permeate returns step (1) and carries out circular treatment, and described mud cake is cured;
(4) toward acid adding in described first permeate, regulate pH to 6-9, then by electrodialysis, desalination is carried out to the first permeate, obtain electrodialysis fresh water and the dense water of electrodialysis;
(5) by dense for described electrodialysis water evaporative crystallization, by reverse osmosis, described electrodialysis fresh water is concentrated, obtain the 3rd permeate and concentrated solution;
(6) described 3rd permeate is directly discharged, and described concentrated solution carries out dry solidification.
Alkali can generate and precipitate with the calcium in garbage burning factory percolation liquid membrane process concentrated liquid (hereinafter referred to as film process concentrated solution), magnesium, heavy metal plasma reaction, reduce the total hardness of film process concentrated solution, and suitable pH is not only conducive to fully carrying out of reaction, also can ensure the stable of precipitation simultaneously, reach preferably sedimentation effect, after adding alkali, the pH of system is 10.5-12.0, be preferably 11.0-11.5, being more preferably pH is 11.5.
Described alkali is sodium hydroxide, calcium hydroxide or sodium carbonate.Above-mentioned alkali source is wide, and cheap.
Throw out in described mixed solution, suspended particle, colloid, macromole organic pollutant etc. retain by micro-filtration, avoid it to block when follow-up reverse osmosis, corrode reverse osmosis membrane, in step (2), adopt tube type filter membrance to carry out micro-filtration to described mixed solution.Tube type filter membrance is insensitive to blocking, is easy to cleaning, and the pressure-losses in membrane module is less, is applicable to containing higher how sedimentary filtration.
The aperture of described tube type filter membrance is 0.05-0.2 μm, is more preferably 0.1 μm.The aperture of tube type filter membrance is too small, easily blocks, and aperture is excessive then can not effectively catching pollutent, affects filter effect.
The operating pressure of described tube type filter membrance is 0.07MPa-0.7MPa, and be preferably 0.1-0.5MPa, be more preferably 0.35-0.45MPa, what can ensure tube type filter membrance has higher filtration efficiency.
For avoiding affecting micro-filtration, when the precipitate buildup in trapped fluid to a certain extent time, need process in time, usually, carry out filter press dehydration when the described contents of precipitate dammed in liquid reaches 2-5%.
Electrodialysis can remove the salinity in micro-filtration product water further, is better protective membrane element, extends the work-ing life of membrane element, and before electrodialysis, regulate pH to 6-9, preferred pH to be 6.5-7.5, preferred pH is 7.0.
Reverse osmosis can retain various mineral ions, colloidalmaterial and macromole solute in electrodialysis fresh water further, during reverse osmosis, can adopt conventional reverse osmosis membrane, as coiled reverse osmosis membrane.
The ratio of desalinization of described reverse osmosis membrane is 99.0-99.8%, is preferably 99.5%, selects the reverse osmosis membrane of above-mentioned ratio of desalinization can reach better treatment effect.For ensureing higher reverse osmosis efficiency, the operating pressure of described reverse osmosis membrane is 0.5MPa-4.0MPa, is preferably 3-4MPa, is more preferably 3.5MPa.
After described concentrated solution makes powder by spraying dry, then powder is cured processes.
Compared with prior art, beneficial effect of the present invention is:
The method for the treatment of refuse incineration leachate film process concentrated solution of the present invention, first calcium, magnesium, heavy metal plasma in film process concentrated solution is removed by adding alkali, reduce the total hardness of film process concentrated solution, then after carrying out preliminary treatment by micro-filtration, because garbage burning factory is high relative to refuse landfill film process concentrated solution salinity, pollutant load high, can be very low as directly carried out the reverse osmosis rate of recovery, therefore reduce by electrodialysis the salinity that micro-filtration produces water again, finally carry out advanced treatment through reverse osmosis again.
The present invention is directed to the singularity of garbage burning factory percolation liquid membrane process concentrated liquid composition, select suitable treatment process, operation, good treatment effect can be reached, process standard water discharge.
Method of the present invention improves the rate of recovery (can reach 80%) of rubbish percolation liquid membrane concentrated solution, decreases the dense water yield of final reverse osmosis membrane.
Method operation of the present invention arranges rationally, removes pollutent gradually by micro-filtration, electrodialysis, reverse osmosis, and not only treatment effect is good, also can reduce the loss to equipment.
Present invention process is simple, and easy and simple to handle, practical, treatment effect is good, and it is as a kind of further treatment technique, can make up the deficiency of conventional garbage incineration leachate treatment technology very well.
Accompanying drawing explanation
Fig. 1 is the process flow sheet of the treatment process of garbage burning factory percolation liquid membrane process concentrated liquid of the present invention.
Embodiment
The present invention is explained further below in conjunction with embodiment.
Embodiment 1
Adopt combination process process garbage burning factory percolation liquid membrane process concentrated liquid disclosed by the invention.
After this incineration plant film process, concentrated solution CODcr concentration is 3000mg/L, and total hardness content is 8000mg/L, and conductance is 15600 μ s/cm, pH is 7.2.
(1) get 5 tons of film process concentrated solutions, in film process concentrated solution, add technical grade sheet alkali regulate pH to be 11.5, now, after the heavy metal ion in film process concentrated solution and calcium, magnesium ion etc. and sheet alkali reaction, generate a large amount of precipitations;
(2) the above-mentioned mixed solution containing precipitation is filtered by tube type filter membrance, microfiltration membrane aperture is 0.1 μm, operating pressure is 0.35MPa, the first permeate 4.5 tons is obtained with 500L containing sedimentary trapped fluid after filtration, wherein, the CODcr concentration of the first permeate is 2400mg/L, and total hardness content is 600mg/L, conductance is 16000 μ s/cm, pH is 11.5; In trapped fluid, sedimentary weight content is 3.0%;
(3) 500L goes filter press to dewater containing sedimentary trapped fluid, obtains the second permeate and mud cake, and the second permeate is back to step (1) and continues process, and mud cake concentrates packing landfill after being directly cured process;
(4) pH of the first permeate is regulated, regulating during pH selects acid for technical-grade hydrochloric acid, after acid adding, pH is that the 7.0, first permeate obtains electrodialysis fresh water 4.5 tons after the light indoor desalination of electrodialysis system, and the CODcr concentration of electrodialysis fresh water is 2200mg/L, total hardness content is 200mg/L, conductance is 1200 μ s/cm, pH is 6.8, and the dense room of electrodialysis system adds 250L reverse osmosis produced water, the dense water 250L of electrodialysis is obtained, devaporation crystallization after desalination;
(5) electrodialysis fresh water obtains the 3rd permeate and concentrated solution after coiled reverse osmosis membrane is concentrated, and the ratio of desalinization of reverse osmosis membrane is 99.5%, and operating pressure is 3.5MPa, the 3rd permeate obtained is 4 tons, and CODcr concentration is 32mg/L, and total hardness content is 20mg/L, conductance is 130 μ s/cm, pH is 6.5, qualified discharge, and concentrated solution is 0.5 ton, CODcr concentration is 16800mg/L, total hardness content is 1500mg/L, and conductance is 9800 μ s/cm, pH is 7.2; Adopt spray drying unit to carry out drying to concentrated solution, control the inlet temperature of spray drying unit at 115-120 DEG C, 0.5 ton of concentrated solution last powder 30kg, powder concentrates packing landfill after being cured process.
Embodiment 2
This exemplary application combination process process disclosed by the invention garbage burning factory percolation liquid membrane process concentrated liquid.
After this incineration plant film process, concentrated solution CODcr concentration is 4500mg/L, and total hardness content is 11000mg/L, and conductance is 18600 μ s/cm, pH is 7.2.
(1) get 5 tons of film process concentrated solutions, in film process concentrated solution, add technical grade sheet alkali regulate pH to be 11.5, now, after the heavy metal ion in film process concentrated solution and calcium, magnesium ion etc. and sheet alkali reaction, generate a large amount of precipitations;
(2) the above-mentioned mixed solution containing precipitation is filtered by tube type filter membrance, microfiltration membrane aperture is 0.1 μm, operating pressure is 0.45MPa, the first permeate 4.5 tons is obtained with 500L containing sedimentary trapped fluid after filtration, wherein, the CODcr concentration of the first permeate is 3600mg/L, and total hardness content is 800mg/L, conductance is 19000 μ s/cm, pH is 11.5; In trapped fluid, sedimentary weight content is 3.5%;
(3) 500L goes filter press to dewater containing sedimentary trapped fluid, obtains the second permeate and mud cake, and the second permeate is back to step (1) and continues process, and mud cake concentrates packing landfill after being directly cured process;
(4) pH of the first permeate is regulated, regulating during pH selects acid for technical-grade hydrochloric acid, after acid adding, pH is that the 7.0, first permeate obtains electrodialysis fresh water 4.5 tons after the light indoor desalination of electrodialysis system, and the CODcr concentration of electrodialysis fresh water is 3200mg/L, total hardness content is 260mg/L, conductance is 1500 μ s/cm, pH is 6.8, and the dense room of electrodialysis system adds 250L reverse osmosis produced water, the dense water 250L of electrodialysis is obtained, devaporation crystallization after desalination;
(5) electrodialysis fresh water obtains the 3rd permeate and concentrated solution after coiled reverse osmosis membrane is concentrated, and the ratio of desalinization of reverse osmosis membrane is 99.5%, and operating pressure is 3.5MPa, wherein the 3rd permeate is 4 tons, and CODcr concentration is 50mg/L, and total hardness content is 20mg/L, conductance is 180 μ s/cm, pH is 6.5, qualified discharge, and concentrated solution is 0.5 ton, CODcr concentration is 26000mg/L, total hardness content is 1800mg/L, and conductance is 12000 μ s/cm, pH is 7.2; Adopt spray drying unit to carry out drying to concentrated solution, control the inlet temperature of spray drying unit at 115-120 DEG C, 0.5 ton of concentrated solution last powder 32kg, powder concentrates packing landfill after being cured process.
Finally should be noted that; the above embodiment is described in detail the treatment process of a kind of percolate from garbage filling field film process concentrated solution of the present invention; just understand method of the present invention for helping; not scope of the present invention is limited; for those of ordinary skill in the art; under not departing from the present invention and designing the prerequisite of spirit, to the changes and improvements part that technical scheme of the present invention is made, all should fall within protection domain that claims of the present invention determine.
Claims (5)
1. a method for treating refuse incineration leachate film process concentrated solution, is characterized in that, comprising:
(1) alkali is added in garbage burning factory percolation liquid membrane process concentrated liquid react, obtain the mixed solution containing precipitation;
(2) micro-filtration is carried out to described mixed solution, obtain the first permeate and the liquid that dams;
(3) carry out filter press dehydration to described trapped fluid, obtain the second permeate and mud cake, described second permeate returns step (1) and carries out circular treatment, and described mud cake is cured;
(4) toward acid adding in described first permeate, regulate pH to 6-9, then by electrodialysis, desalination is carried out to the first permeate, obtain electrodialysis fresh water and the dense water of electrodialysis;
(5) by dense for described electrodialysis water evaporative crystallization, by reverse osmosis, described electrodialysis fresh water is concentrated, obtain the 3rd permeate and concentrated solution;
(6) described 3rd permeate is directly discharged, and described concentrated solution carries out dry solidification;
In step (1), after adding alkali, the pH of system is 10.5-12.0;
In step (2), tube type filter membrance is adopted to carry out micro-filtration to described mixed solution; The aperture of described tube type filter membrance is 0.05-0.2 μm; The operating pressure of described tube type filter membrance is 0.35-0.45MPa.
2. the method for claim 1, is characterized in that, described alkali is sodium hydroxide, calcium hydroxide or sodium carbonate.
3. the method for claim 1, is characterized in that, described in the contents of precipitate dammed in liquid carry out filter press dehydration when reaching 2-5%.
4. the method for claim 1, is characterized in that, in step (4), regulates pH to 6.5-7.5.
5. the method for claim 1, is characterized in that, in step (5), during reverse osmosis, the ratio of desalinization of reverse osmosis membrane is 99.0-99.8%.
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| CN103964609A (en) * | 2014-05-16 | 2014-08-06 | 天津海普尔膜科技有限公司 | Membrane treatment method of landfill leachate concentrate |
| CN104150666B (en) * | 2014-06-09 | 2015-09-02 | 煤科集团杭州环保研究院有限公司 | High ammonia nitrogen tail washings zero-discharge treatment system after a kind of alkaline etching waste liquid for producing process and method |
| CN104310682A (en) * | 2014-08-16 | 2015-01-28 | 厦门世达膜科技有限公司 | A zero-discharge process for tartaric acid production wastewater |
| CN104496103A (en) * | 2014-12-23 | 2015-04-08 | 北京桑德环境工程有限公司 | Method for treating landfill leachate concentrated liquid |
| CN105984986A (en) * | 2015-02-02 | 2016-10-05 | 湖南华电常德发电有限公司 | Advanced treatment method for desulphurization wastewater of power plant |
| CN104787982B (en) * | 2015-04-22 | 2016-07-13 | 江苏省环境科学研究院 | A kind of processing method of percolate |
| CN107840537A (en) * | 2017-11-10 | 2018-03-27 | 深圳能源资源综合开发有限公司 | Method for treating garbage percolation liquid and system |
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| CN111252868A (en) * | 2020-02-24 | 2020-06-09 | 鹭滨环保科技（上海）股份有限公司 | Resource disposal system and method for landfill leachate membrane filtration concentrated solution |
| CN111470735A (en) * | 2020-05-19 | 2020-07-31 | 厦门嘉戎技术股份有限公司 | Treatment method and system for aged leachate |
| CN114538675A (en) * | 2022-01-11 | 2022-05-27 | 安徽普朗膜技术有限公司 | Landfill leachate treatment system and treatment method |
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| JP3909793B2 (en) * | 1999-09-07 | 2007-04-25 | 株式会社荏原製作所 | Method and apparatus for treating organic wastewater containing high-concentration salts |
| CN100406399C (en) * | 2005-08-01 | 2008-07-30 | 陈昆柏 | Method and system for harnessing consumer waste landfill percolate |
| CN101402499B (en) * | 2008-10-23 | 2011-03-23 | 杭州水处理技术研究开发中心有限公司 | Method for concentrating waster solution from process for processing seafood |
| CN101734820B (en) * | 2008-11-07 | 2011-12-28 | 中国石油化工股份有限公司 | Method for treating high slat-containing wastewater |
| CN101928094B (en) * | 2009-10-12 | 2012-07-04 | 杭州深瑞水务有限公司 | Technology for treating garbage leachate |
| CN102153233B (en) * | 2011-03-03 | 2012-11-07 | 浙江博世华环保科技有限公司 | Treatment method and treatment system for percolate in garbage-burning plant |
| CN102774994B (en) * | 2011-05-13 | 2015-11-25 | 周健 | Combination membrane Separation and Recovery brine waste technique |
| CN102942279A (en) * | 2012-10-12 | 2013-02-27 | 江苏华晖环保科技有限公司 | Treatment method for circulating water sewerage and reverse osmosis concentrated water and equipment thereof |
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Inventor after: Chen Kunbai Inventor after: Yao Huangli Inventor after: Wang Lijiang Inventor after: Shen Bin Inventor after: Yu Tianyun Inventor after: Liao Xiaofeng Inventor after: Huang Zhuomin Inventor after: Li Yuyun Inventor after: Shi Yongqi Inventor after: Tao Lixia Inventor before: Chen Kunbai Inventor before: Wang Lijiang Inventor before: Shen Bin Inventor before: Yu Tianyun Inventor before: Huang Zhuomin Inventor before: Han Zhixiong Inventor before: Jin Xiangfu |
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