CN100478289C - Method for treating medium and terminal garbage percolate - Google Patents
Method for treating medium and terminal garbage percolate Download PDFInfo
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- CN100478289C CN100478289C CNB2007101187759A CN200710118775A CN100478289C CN 100478289 C CN100478289 C CN 100478289C CN B2007101187759 A CNB2007101187759 A CN B2007101187759A CN 200710118775 A CN200710118775 A CN 200710118775A CN 100478289 C CN100478289 C CN 100478289C
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- REZZEXDLIUJMMS-UHFFFAOYSA-M dimethyldioctadecylammonium chloride Chemical compound [Cl-].CCCCCCCCCCCCCCCCCC[N+](C)(C)CCCCCCCCCCCCCCCCCC REZZEXDLIUJMMS-UHFFFAOYSA-M 0.000 claims description 3
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- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 13
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Abstract
本发明提供了一种专门针对中晚期垃圾渗滤液的处理方法：将中晚期垃圾渗滤液中可溶性有机物质划分为亲水性有机物和疏水性有机物两大类型，利用鸟粪石结晶沉淀法除氨氮后，首先利用有机化改性膨润土吸附疏水性物质，并结合絮凝法进行循环处理，然后利用天然膨润土吸附亲水性物质。该方法应用我国储量巨大的天然膨润土，工艺简单，操作方便，处理效果好且稳定，特别适用于难生物降解的中晚期垃圾渗滤液，处理后可以达到国家二级排放标准。其中，鸟粪石可回收作为优质肥料，吸附饱和后的固体废物可就地填埋，被吸附有机物与天然和改性膨润土之间结合力较强而发生固定化作用，不易重新进入溶液相而避免二次污染问题，综合效益明显优于现行技术。The invention provides a treatment method specially for the middle and late stage landfill leachate: the soluble organic matter in the middle and late stage landfill leachate is divided into two types: hydrophilic organic matter and hydrophobic organic matter, and ammonia nitrogen is removed by struvite crystal precipitation method Finally, organically modified bentonite is used to absorb hydrophobic substances, and combined with flocculation for recycling treatment, and then natural bentonite is used to absorb hydrophilic substances. The method uses natural bentonite with huge reserves in my country. The process is simple, the operation is convenient, and the treatment effect is good and stable. It is especially suitable for the middle and late stage landfill leachate that is difficult to biodegrade. After treatment, it can meet the national secondary discharge standard. Among them, struvite can be recycled as a high-quality fertilizer, and the solid waste after adsorption and saturation can be landfilled on the spot. The binding force between the adsorbed organic matter and natural and modified bentonite is strong and immobilized, and it is not easy to re-enter the solution phase. The problem of secondary pollution is avoided, and the comprehensive benefit is obviously better than that of the current technology.
Description
Technical field
The present invention relates to the percolate process field, relate in particular to a kind of method of mineral method combined treatment middle and advanced stage percolate.
Background technology
As a modern sanitary filling field, it is a requisite link that percolate is handled.Percolate is as a kind of special water, because organic concentration height, ammonia nitrogen concentration height, change of water quality is big, the later stage biodegradability is poor, its processing at home and abroad never is well solved as a technical barrier.
China's domestic waste is much higher than organic content in developed country's domestic waste based on food garbage, causes China city garbage percolate COD
CrAnd BOD
5The concentration height.COD in the percolate
CrAnd BOD
5Respectively can be up to 90000mg/L, 38000mg/L even higher, the water quality complexity, hazardness is big, as deals with meeting contaminated soil, surface water or underground water improperly.In a single day percolate pollutes underground water or surface water, its influence is several years, decades at least, go up a century at most, and artificial reparation purification almost is impossible.The Beijing area refuse landfill causes that phreatic Organic pollutants situation is troubling, has caused phreatic pollution as area, northern paradise city refuse landfill.
The A Suwei of Beijing, Bei Shenshu, stable and six li larger refuse landfills such as village, all be the above the average age for marriage refuse landfill of an age about 10 years, there are a large amount of reluctant middle and advanced stage percolates always, becoming the sustainable safe handling of Beijing's household refuse landfill sites, the bottleneck problem of control Beijing groundwater pollution is demanded developing efficient cheap percolate urgently and is handled new technology and novel process.
Domestic and international existing garbage filter liquid processing method mainly contains physico-chemical processes, biological process and reverse osmosis (RO) to be separated.
Physico-chemical processes comprises absorption method, chemical oxidization method, chemical coagulation, the precipitator method, catalytic oxidation etc.Absorption method mainly is to utilize the multi-hole type solid matter, makes one or more materials in the waste water be adsorbed on solid surface simultaneously and the method removed.It comprises two kinds of physical adsorption and chemisorption.Sorbent material commonly used has gac, wilkinite, zeolite, coke, alumina, incinerator bottom ash etc.Gac is owing to have 500～1700m
2The huge specific surface area of/g reaches very strong adsorptive power and is widely used.Active carbon adsorption degree of treatment height, loading capacity is big, and most of organism in the water are all had stronger adsorptive power.Wilkinite becomes popular sorbing material because it has a lot of special nature.But the wetting ability that the surface silicon oxide structure of natural montmorillonite is extremely strong and the hydrolysis of interlayer cation make its absorb organic molecule effectively.Therefore, a lot of in recent years scholars carry out organic modification to natural montmorillonite, increase it to organic adsorptive power.Chemical oxidization method is to utilize strong oxidizer to become micromolecular hydrocarbon polymer or permineralization to become CO the oxidation operation in the waste water
2And H
2O, H
2O
2And O
3Be two kinds of the most frequently used oxygenants.Chemical coagulation, the precipitator method need add chemical agent and produce throwing out, belong to chemically treated category so plant precipitation.Coagulating agent commonly used has Al
2(SO
4)
3, FeSO
4, FeCl
3, PAM etc.For treating refuse percolate more up hill and dale, people have carried out a large amount of explorations at aspects such as catalyzed oxidations.At present, studying many both at home and abroad is ultraviolet oxidation method, catalytic oxidation method etc.The ultraviolet oxidation method is under the prerequisite of UV-irradiation, and the hydroxyl radical free radical that utilizes catalyzed oxidation or semiconductor material to produce comes material in the oxidation percolate, thereby reduces its COD
CrAnd NH
3A kind of method of-N.
Biological process treating refuse percolate is the most frequently used method, and domestic several big main refuse landfill sewage disposal technologies adopt biotechnology more, comprise the processing mode that aerobe processing, anaerobic biological treatment and anaerobic-aerobic combine.Aerobe is handled and is comprised activated sludge process, aeration oxidation pond, biomembrance process, blodisc and bio-trickling filter.Wherein activated sludge process is that aerobe is handled method the most commonly used.Using the maximum form of anaerobic biological treatment both at home and abroad is up-flow anaerobic sludge blanket (UASB).Updraft anaerobic filter has characteristics such as the starting period is short, and shock-resistance is good.Anaerobic Microbiological Treatment Technology is suitable for handling dissolved organic matter, is handling high density (BOD
5〉=2000mg/L) the organic waste water aspect has obtained good result.The bio-oxidation treatment process that domestic many refuse landfill wastewater treatments adopt anaerobic-aerobic to combine.Percolate to high density adopts this method economical rationality, processing efficiency height.
External just gradually adopting novel membrane separation technique to handle and purify percolate, being most widely used of wherein reverse osmosis (RO) isolation technique, and obtained good effect.The effect of membrane sepn pollutent is conspicuous, and the water outlet after separating can reach the corresponding emission standard of country.
Above treatment process respectively has its relative merits, physico-chemical processes be not subjected to the influence of the influent quality water yield, effluent quality more stable, the poor sewage of biochemical is had treatment effect preferably, but the COD clearance is not ideal enough, cost is higher relatively.Gac is on the high side, and absorption is subject to the pH value, and the phenomenon that removal decrease in efficiency and gac are polluted in a large number appears in the influence of factors such as water temperature and duration of contact sometimes, and regeneration is difficult, easily produces secondary pollution.Biological process is better to early stage percolate treatment effect, but require that influent quality is relatively stable, treatment effect is subjected to season and Temperature Influence and instability, construction investment are big, to the middle and advanced stage percolate poor processing effect of biochemical difference.The reverse osmosis method treatment effect is very desirable, but percolate middle and high concentration ammonia nitrogen material, high-enriched organics and inorganic sediment easily form fouling on the film surface, usually causes the membrane sepn effect to be lost efficacy; It is quite big that the percolate high conductivity makes reverse osmosis method handle load; The concentrated solution that produces after the reverse osmosis membrane separation has no idea to handle at present.
For early stage percolate, because the BOD of early stage percolate
5/ COD
Cr＞0.5, easily by biological degradation, bioremediation is a best choice.
For the percolate in mid-term, have only the reverse osmosis effect better at present, the additive method treatment effect is all general.
For the percolate in late period, charcoal absorption and reverse osmosis method effect are all relatively good.
But, therefore,, have only early stage percolate applying biological method to obtain gratifying effect at present with regard to the garbage filter liquid processing method because the shortcoming of charcoal absorption and reverse osmosis method is restricted its application.Be greater than 15 years the working life of general landfill yard, for a landfill yard, the percolate that is produced in most of times belongs to the middle and advanced stage percolate, therefore, the processing of middle and advanced stage percolate is the problem that any one refuse landfill must be faced, and is the focus and the difficult point of present stage percolate processing.
Summary of the invention
The purpose of this invention is to provide a kind of the processing specially and the wholesomeness of exploitation is administered novel method, mainly utilize in natural montmorillonite and the organic bentonite absorption percolate organism and with ammonia nitrogen in the struvite precipitator method removal percolate at the middle and advanced stage percolate.
Treatment process of the present invention may further comprise the steps:
(1) percolate is poured in the reactor 1, according to its NH
4The difference of-N concentration adds Mg
2+And PO
4 3-, make Mg
2+, NH
4 +And PO
4 3-By 1: 1: 1 mol ratio proportioning, stirring reaction postprecipitation, suction filtration makes solid-liquid separation, and solid phase is a struvite crystals, can recycle, and liquid phase then enters next step processing;
(2) the liquid phase input reactor 2, and every 100ml liquid adds the 0.25-0.75g organic bentonite, utilize the natural subsidence method to realize solid-liquid separation behind the stirring reaction, below aqueous deposit at refuse landfill landfill on the spot, supernatant liquor enters next step processing;
(3) the supernatant liquor input reactor 3, and every 100ml liquid adds 0.5g-1.5g alum, utilize the natural subsidence method to realize solid-liquid separation behind the stirring reaction, below aqueous deposit landfill on the spot, supernatant liquor enters next step processing;
(4) repeating step (2) and (3) once more than;
(5) the supernatant liquor input reactor 4, and every 100ml liquid adds the 1-1.5g natural montmorillonite, utilize the natural subsidence method to realize solid-liquid separation behind the stirring reaction, supernatant liquor qualified discharge or recycling, below aqueous deposit landfill on the spot.
Aforesaid method is applicable to that COD concentration is 100～10000mg/l, NH
4-N concentration is that 100～5000mg/l, pH are 6～8.5, the middle and advanced stage percolate of 4 ℃～40 ℃ of temperature.
Above-mentioned steps (1) is generally by adding MgCl
26H
2O and Na
2HPO
412H
2O provides Mg
2+And PO
4 3-, stir 5min above (preferred 30min), precipitate 10min above (preferred 30min) then and can carry out suction filtration.
The organic bentonite that above-mentioned steps (2) is used can prepare by following disposable modified technology: under room temperature (25 ℃) condition, every 5g natural montmorillonite is put into 250ml water, be heated to 60 ℃, stir after 40 minutes, add the 1.5g distearyl dimethyl ammonium chloride, restir 30 minutes, suction filtration, the dechlorination ion, oven dry is ground standby.
Above-mentioned steps (2), (3) and (5) all are stirring velocity 120r/m-140r/m usually, natural subsidence behind the reaction times 2h-3h, below aqueous deposit at refuse landfill landfill on the spot.Usually carry out step (5) after step (2) and (3) circular treatment three times, the supernatant liquor after natural montmorillonite is handled can qualified discharge or recycling, such as being used for kind setting etc.
Treatment process of the present invention is divided into hydrophilic organics hydrophilicity and hydrophobic organic compound two major types with dissolved organic matter matter in the middle and advanced stage percolate, utilize natural montmorillonite absorption hydroaropic substance targetedly, utilize organic modification wilkinite absorption lyophobic dust.And before absorption method is handled, by in percolate, adding Mg
2+And PO
4 3-, make Mg
2+, NH
4 +And PO
4 3-By 1: 1: 1 mol ratio proportioning, can effectively remove the ammonia nitrogen in the percolate.After struvite crystalline deposit method was removed ammonia nitrogen, natural montmorillonite strengthened the hydrophilic organics hydrophilicity adsorptive power.
The inventive method is used organism in huge natural montmorillonite of China's reserves and the organic bentonite absorption percolate, be applicable to the processing of percolate in the refuse landfill, be specially adapted to the improvement engineering of the middle and advanced stage percolate of difficult for biological degradation.With with class methods relatively, sharpest edges are that technology is simple, easy to operate, treatment effect is good, can reach national secondary discharge standard after the processing, and effect stability, struvite is recyclable as fertilizer, adsorb the solid waste landfill on the spot after saturated, it is strong and immobilization role takes place to be adsorbed between organism and natural and the modified alta-mud bonding force, be difficult for reentering solution and avoid secondary pollution problem, comprehensive benefit obviously to be better than existing refuse leachate treatment technology mutually, good application prospects is arranged.This method can be improved the present situation that the continuous a large amount of percolates that produce can not carry out harmless treatment timely and effectively in the current domestic waste landfill disposal engineering, for guaranteeing that city life garbage landfill 40-70 safe operation, contamination-free leak and diffusion provides technical guarantee, make the city drink underground water and exempt from ammonia nitrogen and organic pollution in the percolate.
Embodiment
Below with reference to concrete parameter, more detailed description goes out preferred forms of the present invention.
One, experiment material
The A Suwei of Beijing refuse landfill percolate, pH=7.8, COD
Cr=5066mg/L, BOD
5=1930mg/L, BOD
5/ COD
Cr=0.38, belong to the middle and advanced stage percolate.MgCl
26H
2O, Na
2HPO
412H
2O, NaOH, alum are analytical pure.Jianping, Liaoning natural montmorillonite and organic bentonite.
Wherein, organic bentonite is by disposable modified prepared: under room temperature (25 ℃) condition, take by weighing Jianping, 5g Liaoning natural montmorillonite, pour in the beaker that 250ml water is housed.Be heated to 60 ℃, stir after 40 minutes, add the 1.5g distearyl dimethyl ammonium chloride, stirred 30 minutes, suction filtration, with deionized water wash dechlorination ion, oven dry is ground standby.
Two, experimental procedure and result
1. the struvite precipitator method
Transferring percolate pH value with NaOH is 8.7.In percolate, add a certain amount of MgCl
26H
2O and Na
2HPO
412H
2O, Mg
2+, PO
4 3-And NH
4 +By 1: 1: 1 mol ratio proportioning, stirred 30 minutes, precipitate 30 minutes.Suction filtration makes solid-liquid separation, and solid phase is a struvite crystals, can reclaim.
2. organic bentonite absorption method
Will be except that NH
4Percolate behind the-N under agitation with a certain amount of organobentonite stirring reaction 2 hours, natural subsidence 3 hours, below aqueous deposit at refuse landfill landfill on the spot, supernatant liquor then enters next step processing.
3. flocculence
Supernatant liquor after the organobentonite adsorption treatment and alum stirring reaction 2 hours, natural subsidence is 3 hours then, below aqueous deposit at refuse landfill landfill on the spot, supernatant liquor is then used the organic bentonite re-treatment.
Repeating step 2 and 3, organobentonite and alum respectively with percolate circular treatment three times after, COD
Cr=1295mg/L, COD
CrClearance=74.44%.
4. natural montmorillonite absorption method
Add natural montmorillonite in the supernatant liquor after organobentonite and the alum circular treatment and handle, stirring reaction utilizes the natural subsidence method to realize solid-liquid separation equally after 3 hours.Supernatant C OD
CrDescend obviously COD
CrReduce to 300mg/L, total COD
CrClearance is 94.08%, reaches national secondary discharge standard, below aqueous deposit landfill on the spot.
Below table 1 listed the various parameters and the result of above-mentioned implementation process:
Table 1
Although disclose most preferred embodiment of the present invention and concrete parameter for the purpose of illustration, it will be appreciated by those skilled in the art that: without departing from the spirit and scope of the invention and the appended claims, various replacements, variation and modification all are possible.Therefore, the present invention should not be limited to most preferred embodiment and the concrete disclosed content of parameter.
Claims (6)
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| CN102616967A (en) * | 2012-04-10 | 2012-08-01 | 北京科技大学 | Technological method for advanced treatment of landfill leachate MBR (membrane biological reactor) outlet water according to mineral method |
| CZ305778B6 (en) * | 2014-12-31 | 2016-03-09 | Vysoká Škola Báňská - Technická Univerzita Ostrava | Filter for removing both inorganic and organic substances from contaminated water |
| CN110436714B (en) * | 2019-08-26 | 2020-05-05 | 桂润环境科技股份有限公司 | Treatment device and treatment method for sulfur-containing and ammonia nitrogen-containing landfill leachate |
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2007
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6398958B1 (en) * | 2000-03-08 | 2002-06-04 | Waste Management, Inc. | Facultative landfill bioreactor |
| CN1456521A (en) * | 2003-03-28 | 2003-11-19 | 北京市肇麟环境技术开发公司 | Process and apparatus for urban refuse cite penetrating liquid by three stage plus one process |
| CN1472146A (en) * | 2003-06-24 | 2004-02-04 | 宜兴市天立环保有限公司 | Garbage infiltration liquid treating method |
| CN1978346A (en) * | 2005-12-06 | 2007-06-13 | 昆明市环境科学研究所 | Refuse leachate treatment technology |
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