CN105290077A - Method for coprocessing fly ash and landfill leachate - Google Patents
Method for coprocessing fly ash and landfill leachate Download PDFInfo
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- CN105290077A CN105290077A CN201410267429.7A CN201410267429A CN105290077A CN 105290077 A CN105290077 A CN 105290077A CN 201410267429 A CN201410267429 A CN 201410267429A CN 105290077 A CN105290077 A CN 105290077A
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Abstract
The invention relates to a method for coprocessing fly ash and landfill leachate. According to the method, a solvent in the subcritical or critical state has extremely high oxidability, and Dioxin and the organic pollutant in landfill leachate can be effectively decomposed. After the reaction, aluminosilicate with a stable structure is formed through heavy metal in fly ash and landfill leachate and silicate in fly ash, the leaching toxicity of the heavy metal is obviously reduced, and comprehensive processing of fly ash and landfill leachate is achieved. Meanwhile, the processing technology and processing equipment are simple, and the processing cost is low. According to the method, the processing efficiency of Dioxin is extremely high, the processing of ions of the heavy metal is extremely stable, and harmful processing or resourceful utilizing of the processed solid can be achieved.
Description
Technical field
The present invention relates to the method volume of a kind of associated treatment flying dust and percolate, particularly relate to a kind of method of organic pollution and heavy metal in associated treatment flying dust Zhong bioxin and heavy metal, percolate.
Background technology
Cinder from refuse incineration, according to the difference of its assembling position, mainly can be divided into bottom ash (80%) and flying dust (20%).The residue that flying dust refers to collection in flue gas purification system and recuperation of heat utilize system (as economizer, boiler etc.) and obtains, is about 3% of rubbish.Flying dust discharges bioxin (at present known most cytotoxic compound) containing 80-90%, and is numerous harmful heavy metals of representative with lead, lists National Hazard refuse catalogue in.
Bioxin refers to the chlorine-containing organic compounds linking 2 phenyl ring containing 2 or 1 oxygen key.With 2 in bioxin, 3,7, the chloro-dibenzo of 8-tetra--right-bioxin (2,3,7,8-tetrachlorodibenzo-p-dioxin, 2,3,7, toxicity 8-TCDD) is the strongest, as long as one ounce (28.35 grams), just can kill 1,000,000 people, be equivalent to 1000 times of potassium cyanide (KCN) toxicity.
At present, the processing method of common bioxin has the methods such as cement solidification, melting and solidification, chemosetting.
Adopt the method for cement solidification, advantage is: abundant raw material source, and disposal cost is low; Process equipment is simple, easy to operate; It is high that Biostrength is produced in solidification; Refuse can directly process, without the need to pre-treatment.But the larger ， bioxin of this method increase-volume still exists; Salt in flying dust easily causes firming body to break, and increases permeability, reduces strength of cement.And adopt the mode of melting and solidification, although Vitrea high stability can guarantee the long-term stability of firming body, also the dangers such as bioxin can be processed, there is high volume reduction rate, but this method shortcoming is obvious equally, its energy resource consumption is large, and the heavy metal high temperature such as Pb, Zn in flying dust are volatile, follow-up fume treatment need be carried out, and processing cost is very high.Although chemical curing method processing cost is cheaper than melt process technology; and heavy metals immobilization is good; equipment is simple; reduce perhaps not increase-volume; but its toxic component is complicated, and be difficult to find a kind of blanket chemical curing agent, difficulty carries out scale application; and the stabilization of its Dui bioxin is little, be difficult to process bioxin steady in a long-term.
Meanwhile, percolate from garbage filling field is a kind of high concentrated organic wastewater of complicated component, if do not add process and directly enter environment, can cause serious environmental pollution.And its water quality is complicated, harmfulness is large.There are some researches show, use GC-MS GC-MS to analyze Components of Organic Pollutants in percolate, detect altogether in percolate and mainly contain organic pollutants 63 kinds, confidence level has 34 kinds more than 60%.Wherein, 6 kinds, alkane alkene, carboxylic acids 19 kinds, ester class 5 kinds, alcohol, phenols 10 kinds, aldehyde, ketone 10 kinds, amide-type 7 kinds, aromatic hydrocarbons a kind, other 5 kinds.Wherein be confirmed to be carcinogenic substance a kind, short cancer thing, epicarcinogen 4 kinds, mutagen a kind, what be put into China's priority pollutant " blacklist " has 6 kinds.
Under normal conditions, these two kinds of discarded objects are all process respectively, so processing cost is high, Treatment Stability is low.Therefore, find a kind for the treatment of process, treatment facility is simple, processing cost is cheap, and the technique of obvious processing effect just seems particularly important.
Summary of the invention
The object of the invention is to propose a kind for the treatment of process, treatment facility be simple, processing cost is cheap, the technique of obvious processing effect, can associated treatment flying dust Zhong bioxin and heavy metal, organic pollution and heavy metal in percolate.
For achieving the above object, the invention provides a kind of processing method, the treating method comprises following steps:
A, the ratio of basic species and flying dust 1:1 ~ 1:40 in mass ratio to be mixed, form the mixture of basic species and flying dust;
B, the mixture of A to be mixed with the solid-liquid ratio of percolate in 1:3 ~ 1:30, stir, form solidliquid mixture;
C, solidliquid mixture is added in reactor, check air-tightness, determine that reactor air-tightness is adjusted to 120 ~ 350 DEG C temperature parameter after good, and the pressure of reactor is set to 1.5 ~ 7.0Mpa;
D, constantly to stir, when the temperature in reactor is elevated to after the temperature value of setting, continue reaction 1 ~ 10h;
E, by process after mixture carry out Separation of Solid and Liquid, afterwards again dehydration after solids carry out harmless treatment or recycling.
Preferably, during the intensification of described reactor, its heating rate is 1 ~ 10 DEG C/min.
Preferably, described reactor is withstand voltage reactor.
Preferably, described reactor inner materials is stainless steel, pottery or polytetrafluoroethylene (PTFE), and outside material is cast iron.
Preferably, with the device of automatic stirring in described reactor, in heating process, constantly at the uniform velocity solidliquid mixture is stirred.
Preferably, the solid-liquid separation method in step e can be mechanism filter-pressing dehydration or centrifugal dehydration.
Preferably, according to described disposal methods, when the ratio of basic species and flying dust 1:5 ~ 1:20 in mass ratio mixes, the international toxicity equivalent of the flying dust after process is for being less than 0.5ngI-TEQ/g.
Further, preferably, according to described disposal methods, when the temperature of reactor is 220 DEG C ~ 350 DEG C, the international toxicity equivalent of the flying dust after process is for being less than 0.3ngI-TEQ/g.
Preferably, reactor is when processing flying dust and percolate, and solvent is in subcritical or critical condition.
Based on technique scheme, advantage of the present invention is:
The invention provides a kind of method of organic pollution and heavy metal in associated treatment flying dust Zhong bioxin and heavy metal, percolate, utilize the solvent be under subcritical or critical condition to have extremely strong oxidisability, process the heavy metal in flying dust in bioxin and flying dust and percolate and organic pollution simultaneously.Meanwhile, treatment process of the present invention, treatment facility are simple, processing cost is cheap, and the treatment effeciency of method Dui bioxin of the present invention and organic pollution is high, heavy metal ion has stronger stability after treatment, makes the solids after processing can realize harmless treatment or recycling.
Detailed description of the invention
Below by embodiment, technical scheme of the present invention is described in further detail.
Embodiment 1
The invention provides the processing method of a kind of flying dust and percolate, it is specially as described below:
The ratio of basic species and flying dust 1:1 ~ 1:40 in mass ratio mixed, form the mixture of basic species and flying dust, the basic species of interpolation has NaOH, Na
2cO
3, KOH, K
2cO
3deng.Add basic species and can significantly improve reaction efficiency, carbon under this condition in bioxin-chlorine bond fission, the molecular scission of large molecular organic pollutants, and alkaline environment can accelerate this trend, also can reduce the adding of alkaline matter the corrosion that chlorion that reaction produces brings, and it can reduce the formation of toxic chlorinated thing byproduct effectively.
The mixture of basic species and flying dust is mixed with the solid-liquid ratio of percolate in 1:3 ~ 1:30, stirs, form solidliquid mixture.In order to obtain preferably treatment effect, the alcohols materials such as methyl alcohol can be added wherein, also can add the materials such as copper powder, iron powder, metal oxide, as catalyst, to accelerate reaction rate, cost-saving.
Poured into by solidliquid mixture in reactor, described reactor is withstand voltage reactor, and its inner materials is stainless steel, pottery or polytetrafluoroethylene (PTFE), and outside material is cast iron.Check air-tightness after screwing bolts, determine that reactor air-tightness is adjusted to 120 ~ 350 DEG C temperature parameter after good, and the pressure of reactor is set to 1.5 ~ 7.0Mpa.During the intensification of described reactor, its heating rate is 1 ~ 10 DEG C/min.And with the device of automatic stirring in described reactor, in heating process, constantly at the uniform velocity can stir solidliquid mixture, solidliquid mixture is being heated evenly, fully react.
Continuous stirring, when the temperature in reactor is elevated to after the temperature value of setting, continues reaction 1 ~ 10h, closes heater, naturally cool to room temperature.Reactor is when processing flying dust and percolate, and solvent is in subcritical or critical condition.Be in solvent that is subcritical or critical condition just because of this there is extremely strong oxidisability, to such an extent as to it can decompose bioxin and organic pollution.Meanwhile, the heavy metal after reaction in flying dust and percolate and the silicate in flying dust define other alumino-silicates with rock-steady structure, and the Leaching of heavy metal is reduced.
Mixture after process is carried out Separation of Solid and Liquid, again the solids after dehydration is carried out harmless treatment or recycling afterwards.Particularly, the solids after dehydration can direct landfill or be mixed into cement landfill, and its toxicity is very low, meets state specified standards completely, also can be mixed into concrete and use as building materials, carry out recycling.
The assay method of Zhong bioxin of the present invention carries out according to Environmental Protection Agency USA (USEPA) revised edition method 1613.
In view of international convention, international toxicity equivalent (I-TEQ) is mainly adopted to represent the concentration of bioxin herein.
In the present invention, the heavy metal diafiltration toxotest in percolate detects according to People's Republic of China's environmental protection professional standard HJ/T299-2007, solid waste Leaching leaching method sulfonitric method.
Embodiment 2
In the present embodiment, what basic species adopted is NaOH.Itself and flying dust are mixed in the solid-liquid ratio of 1:15, the mixture of basic species and flying dust is mixed with the solid-liquid ratio of percolate in 1:10.Adopt the processing method described in embodiment 1 afterwards, the temperature of reactor is set to 250 DEG C, and pressure adopts 3 ~ 5Mpa, processes 3 ~ 5h in a kettle..
The processing mode described in embodiment 1, bioxin decrement more than 96.66% in waste liquid after process, the heavy metals such as Mn, Ni, Cu, Zn, Cd, Pb, treatment effeciency is respectively 96.35%, 97.56%, 96.25%, 98.59%, 97.22%, 96.81%, treatment effeciency all reaches more than 96%, shows excellent treatment effect.
Embodiment 3
In the present embodiment, what basic species adopted is potassium hydroxide.Itself and flying dust are mixed in the solid-liquid ratio of 1:15, the mixture of basic species and flying dust is mixed with the solid-liquid ratio of percolate in 1:10.Adopt the processing method described in embodiment 1 afterwards, the temperature of reactor is set to 190 DEG C, and pressure adopts 2 ~ 3Mpa, processes 2 ~ 3h in a kettle..
The processing mode described in embodiment 1, bioxin decrement 92.5% in waste liquid after process, the heavy metals such as Mn, Ni, Cu, Zn, Cd, Pb, treatment effeciency is respectively 90.22%, 91.23%, 88.74%, 90.86%, 91.78%, 95.12%, treatment effeciency all reaches more than 88%, shows good treatment effect.
Embodiment 4
In the present embodiment, what basic species adopted is NaOH.Itself and tripoli are mixed in the solid-liquid ratio of 1:20, the mixture filtrate of basic species and tripoli is mixed in the solid-liquid ratio of 1:10.Adopt the processing method described in embodiment 1 afterwards, the temperature of reactor is set to 250 DEG C, and pressure adopts 3 ~ 4Mpa, processes 2 ~ 3h in a kettle..
The processing mode described in embodiment 1, bioxin decrement 92.5% in waste liquid after process, the heavy metals such as Mn, Ni, Cu, Zn, Cd, Pb, treatment effeciency is respectively 95.42%, 94.56%, 94.26%, 93.11%, 98.36%, 92.26%, treatment effeciency all reaches more than 92%, shows good treatment effect.
The know-why realizing technique effect described in the present embodiment is that the form of Si in reacted flying dust changes, and the heavy metal after reaction in solidliquid mixture forms the alumino-silicate with rock-steady structure, and the Leaching of heavy metal is reduced.Carbon in bioxin-chlorine bond fission, the molecular scission of large molecular organic pollutants, and alkaline environment can accelerate this trend, also can reduce the adding of alkaline matter the corrosion that chlorion that reaction produces brings.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; Although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or carry out equivalent replacement to portion of techniques feature; And not departing from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technical scheme scope of request of the present invention protection.
Claims (9)
1. the method for organic pollution and heavy metal in bioxin and heavy metal, percolate in associated treatment flying dust, is characterized in that: the treating method comprises following steps:
A, the ratio of basic species and flying dust 1:1 ~ 1:40 in mass ratio to be mixed, form the mixture of basic species and flying dust;
B, the mixture of basic species and flying dust to be mixed with the solid-liquid ratio of percolate in 1:3 ~ 1:30, stir, form solidliquid mixture;
C, solidliquid mixture is poured in reactor, after screwing bolts, check air-tightness, determine that reactor air-tightness is adjusted to 120 ~ 350 DEG C temperature parameter after good, and the pressure of reactor is set to 1.5 ~ 7.0Mpa;
D, constantly to stir, when the temperature in reactor is elevated to after the temperature value of setting, continue reaction 1 ~ 10h;
E, by process after mixture carry out Separation of Solid and Liquid, afterwards again dehydration after solids carry out harmless treatment or recycling.
2. processing method according to claim 1, is characterized in that: during the intensification of described reactor, its heating rate is 1 ~ 10 DEG C/min.
3. processing method according to claim 1, is characterized in that: described reactor is withstand voltage reactor.Reactor can be specifically vertical response still or horizontal reacting still, can multi-floating bodies continued operation or single still intermittently operated.Bedroom reactor can adopt inside to add baffle plate and realize continued operation.
4. processing method according to claim 1, is characterized in that: described reactor inner materials is stainless steel, pottery or polytetrafluoroethylene (PTFE), and outside material is cast iron.
5. processing method according to claim 1, is characterized in that: with agitating device in described reactor, in heating process, constantly at the uniform velocity stir solidliquid mixture.
6. processing method according to claim 1, is characterized in that: the dewatering type in step e is mechanism filter-pressing dehydration or centrifugal dehydration.
7. processing method according to claim 1, it is characterized in that: according to described disposal methods, when the ratio of basic species and flying dust 1:5 ~ 1:20 in mass ratio mixes, temperature parameter is adjusted to 120 ~ 350 DEG C, and the pressure of reactor is set to 1.5 ~ 7.0Mpa, reaction time 1 ~ 10h, the international toxicity equivalent of the flying dust after process and percolate Zhong bioxin is less than 0.4I-TEQ/g.
8. processing method according to claim 1, it is characterized in that: according to described disposal methods, when the ratio of basic species and flying dust 1:5 ~ 1:20 in mass ratio mixes, temperature parameter is adjusted to 120 ~ 350 DEG C, and the pressure of reactor is set to 1.5 ~ 7.0Mpa reaction time 1 ~ 10h.
9. processing method according to claim 1, is characterized in that: reactor is when processing flying dust and percolate, and solvent is in subcritical or critical condition.
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Cited By (7)
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| CN106217925A (en) * | 2016-08-02 | 2016-12-14 | 天津泰达环保有限公司 | A kind of method of pretreatment before incineration of refuse flyash is melted |
| CN106391652A (en) * | 2016-08-31 | 2017-02-15 | 北京首创北科环境科技研究院有限公司 | Cooperative treatment method for refuse incineration fly ash and refuse leachate |
| CN108101511A (en) * | 2017-12-13 | 2018-06-01 | 北京工业大学 | A kind of heavy metal pollution earth cooperation flying ash prepares the microwave sintering method of haydite |
| CN109647850A (en) * | 2018-12-06 | 2019-04-19 | 上海金山环境再生能源有限公司 | The processing system of collaboration processing incineration of refuse flyash and garbage leachate |
| CN109821863A (en) * | 2019-03-28 | 2019-05-31 | 北京科技大学 | A kind of method of percolate and flying ash cooperative disposal |
| CN109956537A (en) * | 2019-03-26 | 2019-07-02 | 河北科技大学 | A kind of processing method of the waste water containing acetone cyanohydrin |
| CN111360024A (en) * | 2020-03-12 | 2020-07-03 | 浙江美臣新材料科技有限公司 | Method for deeply removing soluble components in industrial waste residue |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106217925A (en) * | 2016-08-02 | 2016-12-14 | 天津泰达环保有限公司 | A kind of method of pretreatment before incineration of refuse flyash is melted |
| CN106391652A (en) * | 2016-08-31 | 2017-02-15 | 北京首创北科环境科技研究院有限公司 | Cooperative treatment method for refuse incineration fly ash and refuse leachate |
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| CN109647850A (en) * | 2018-12-06 | 2019-04-19 | 上海金山环境再生能源有限公司 | The processing system of collaboration processing incineration of refuse flyash and garbage leachate |
| CN109956537A (en) * | 2019-03-26 | 2019-07-02 | 河北科技大学 | A kind of processing method of the waste water containing acetone cyanohydrin |
| CN109821863A (en) * | 2019-03-28 | 2019-05-31 | 北京科技大学 | A kind of method of percolate and flying ash cooperative disposal |
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| CN111360024A (en) * | 2020-03-12 | 2020-07-03 | 浙江美臣新材料科技有限公司 | Method for deeply removing soluble components in industrial waste residue |
| CN111360024B (en) * | 2020-03-12 | 2021-12-24 | 浙江美臣新材料科技有限公司 | Method for deeply removing soluble components in industrial waste residue |
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