CN104959375B - Method and system for remediating organic matter polluted soil by use of landfill leachate - Google Patents
Method and system for remediating organic matter polluted soil by use of landfill leachate Download PDFInfo
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Abstract
The invention relates to a method and a system for remediating organic matter polluted soil by use of landfill leachate. According to the method and the system, the landfill leachate is fed into a landfill leachate evaporator for heating evaporation and the temperature is controlled within the range of 100-150 DEG C; the organic matter polluted soil is put into an organic polluted soil desorption container, the organic superheated steam generated by the landfill leachate evaporator is introduced into the organic polluted soil desorption container containing the organic matter polluted soil, wherein the leaching time is 10-30 minutes; the organic pollutants in the organic polluted soil are removed by virtue of desorption due to contact with the superheated steam generated in the heating evaporation process of the landfill leachate, and therefore, the organic polluted sol remediation is completed. The organic superheated steam is high in organic matter content and large in humidity, and the organic pollutants in the soil can be greatly resolved and desorbed. The generated organic mixed waste gas is introduced into a waste gas condenser and condensed into a liquid for safe disposal. The left landfill leachate is further treated and discharged with standards, and no secondary pollution is produced.
Description
Technical field
The invention belongs to contaminated soil remediation technical field, and in particular to a kind of percolate is used for Organic Pollution soil
Restorative procedure and system.
Background technology
In recent years, with the increase of pollution intensity caused by China's industrial and agricultural production, the overall situation of China's soil pollution
Sternness, soil pollution causes serious economic loss.Rough estimates, the whole nation about 10,000,000 hm of contaminated arable land2, and organic dirt
Thing polluted agricultural land is contaminated up to 36,000,000 hm2, the pesticide residues exceeding standard rate of main farm produce is up to 16%～20%；Sewage irrigation is polluted
Plough 216.7 ten thousand hm2, solid waste stores up occupation of land and ruins the hm of field 13.3 ten thousand2.Every year because soil pollution underproduction grain exceedes
10000000 t, cause about 20,000,000,000 yuan of various economic losses.
Organic substance in soil has it to be different from the pollution of other pollutant special as the special soil pollutant of a class
Property, and because its complicated component and special hazardness, the toxic dirt that potential danger is big, answer priority acccess control is listed in environment
Dye thing.
At present, it is excessively used the production such as chemical fertilizer and the leakage of pesticide, oil field prospecting, oil exploitation, oil storage and transportation and gas station
Activity causes substantial amounts of soil to be subject to Organic Pollution, and organic material contaminated soil is in rising trend.Organic pollution of soil is caused
Biological product quality constantly declines, and is detrimental to health, and to natural environment and human survival ill effect is produced.Therefore process
Organic contaminants in soil becomes the urgent task that current soil environment is repaired.
For the corresponding related soil recovery technique of Organic substance mainly have phytoremediation technology, microorganism remediation technology,
Soil chemistry drip washing recovery technique, technology of Electrodynamics Renovation, thermal desorption recovery technique, steam microwave leaching technology etc..
Phytoremediation technology be extracted using plant, degraded, being absorbed or curing soil in volatility organic contamination
Material, also referred to as without Soil ecology restoration technology.Although phytoremediation technology cost is relatively low, it spends the cycle longer, does not apply to
In the urban land for needing quick reparation；Furthermore the concentration of plant roots and stems length and pollutant is limited to, disposal ability is limited.
Microorganism remediation technology refer to microorganism can with organic pollution as carbon source and the energy or with other organic substances
Carry out Co metabolism and degradable organic pollutant.Because the method needs constantly to add biological preparation, and microorganism in soil
Middle mass transfer effect is bad, and not exclusively degraded can produce secondary pollution, additionally there are repairing efficiency it is long the shortcomings of.
Soil chemistry drip washing recovery technique is to inject or penetrate into contaminated soil by solvents such as surfactant solutions
In, organic pollution by being dissolved in solvent in formed emulsion or after the reaction with solution be in solubility, Ran Houfu
Solvent liquid containing pollutant is collected and carries out after-treatment.This kind of method rehabilitation cost is low, simple to operate, but efficiently,
Obligate surfactant is not easily found, and remediation efficiency is not high, and equipment is high with sewage disposal expense.
Electroremediation technology is to drive specific organic contamination species by electrochemistry and electrodynamic compound action
Electrode district is enriched to, is focused on or detached process.Electro reclamation speed, cost be relatively low, suitable for small range
The reparation of interior dissolved organic matter thing contaminated soil.And for insoluble organic pollution, chemistry solubilising is needed, it is also easy to produce secondary
Pollution, in addition Electroremediation can destroy the microbial environment and intrinsic property of soil.
Thermal desorption recovery technique refers to that using direct or indirect heat exchange method heating organic polluted soil makes therein
The process that organic contamination component and soil media are separated, although thermal desorption technology has the Pollutant Treatment wide ranges, equipment can
It is mobile, repair after soil it is recycling the advantages of, but while have that desorption time is long, have harmful effect to soil physico-chemical property
Shortcoming.
Soil vapor extraction (abbreviation SVE) technology is contacted with organic material contaminated soil using steam, and steam is parsed and pressed from both sides
With the VOCs in soil aperture, a kind of based technique for in-situ remediation of volatile organic contaminant in soil is removed.SVE has price low
It is honest and clean, workable, can using standard device, process Organic substance wide ranges, do not destroy Soil structure and do not produce secondary pollution etc.
Advantage.But the organic pollutant removal of SVE centerings volatility and low volatility is less efficient, the cycle is longer.
With the development of the city with the increase of population, China's domestic waste is growing, and rubbish is properly manipulated so
For an increasingly urgent task.Urban garbage disposal method of disposal mainly has landfill, burning, compost etc., current China
The use of most technology is then sanitary landfills.During landfill of life waste, due to compacting and microbial decomposition,
Contained pollutant with moisture dissolution, and will form percolate together with precipitation, runoff etc. in rubbish, if percolate
Deal with improperly, secondary pollution can be caused to environment, by polluted-water, soil, air etc..
Percolate mainly has following characteristics：Organic concentration is high, wherein CODcrAnd BOD5Every liter of percolate height
Up to tens of thousands of milligrams；Complicated component, heavy metal ion therein and toxic organic compound can be produced to microorganism and poison inhibitory action；Ammonia
Nitrogen content is high, reaches as high as thousand of to tens of thousands of per liter of milligrams, seriously inhibits the activity of microorganism in biological treatment；The ratio of C/N
Value imbalance, and P elements shortage；Water quality is continually changing change of water quality greatly with landfill time and degree of stability, with refuse landfill
The increase at age, the biodegradability of percolate is in reduction trend.
Percolate middle and high concentration, the Organic substance of difficult degradation are to cause the intractable main cause of percolate, difficult degradation
A large amount of presence of Organic substance further cause biological treatment not good to Organic Pollutants of Landfill Leachate removal effect.Contain in percolate
The organic macromolecule hard-degraded substances such as polycyclic aromatic hydrocarbon, representative examples of saturated aliphatic carboxyl compound, aldehyde phenol.
Percolate BOD5/CODcrAs the increase of the landfill time limit is gradually lowered, the biodegradability of percolate by
Gradual change is poor, the BOD of initial landfill stage percolate5/CODcr0.5～0.6, and fill its BOD of the later stage5/CODcrOnly 0.05
～0.15.
Organic macromolecule hard-degraded substance in percolate is removed using the method for evaporation, to follow-up percolate
Treatment effect has clear improvement.Organic heat steam obtained by evaporation can be used for the reparation of organic material contaminated soil.
The content of the invention
There is provided a kind of easy to operate, efficient percolate of operation for the problem above present invention is used for Organic Pollution
Native restorative procedure and system, the method is applied widely, for volatile organic matter and semi-volatile organic matter have stronger
The combination property such as removal ability and higher removal efficiency, removal cycle is better than other organic material contaminated soil recovery techniques.This
Method carries out organic material contaminated soil reparation while organic pollution in removing percolate, and the method can be reduced effectively
Pollutant load in organic contamination soil, reaches the purpose of soil remediation.
In order to solve problem above the invention provides a kind of percolate be used for Organic Pollution soil restorative procedure, its
It is characterised by：Comprise the following steps：
The first step：Percolate is put in percolate vaporizer, heating evaporation is carried out, temperature control is 100
～150 DEG C；
Second step：Organic Pollution soil is put in organic Polluted Soil desorption container, percolate vaporizer is produced
Organic heat steam be passed through fill organic material contaminated soil organic contamination soil desorption container in, extraction time be 10～30min；
3rd step：The heat steam contact that organic pollution is produced by percolate heating evaporation in organic material contaminated soil
Desorption is removed, and completes organic polluted soil reparation；Organic heat steam content of organics is high, high humidity, can parse significantly de-
Attached organic contaminants in soil.
4th step：The organic mixed waste gas of generation are passed through in off-gas condenser, are condensed into after liquid and carry out again safe disposal.
Remaining percolate further processes qualified discharge, does not produce secondary pollution.
Described percolate container for evaporation is not particularly limited, as long as it can make percolate in temperature 100
～150 DEG C are evaporated to organic heat steam, for example, heated percolate using microwave evaporation device, high-temperature gas vaporizer
Evaporation.
Tiny structure is kept in described percolate vaporizer.
Tiny structure is kept in described organic contamination soil desorption container.
The BOD of the percolate5/CODcrFor 0.5～0.6.Wherein most organic dirts in Organic Pollution soil
Dye thing boiling point is at 100～300 DEG C.
A kind of percolate is used for Organic Pollution soil repair system, it is characterised in that：Including percolate evaporation
Device, organic contamination soil desorption container, off-gas condenser；Percolate vaporizer is provided with percolate inlet port, You Jire
Steam (vapor) outlet；Organic contamination soil desorption container is provided with organic vapourss inlet port, organic contamination soil inlet port, clean soil and goes out
Mouth, organic exhaust gas outlet I；Off-gas condenser is provided with organic exhaust gas inlet port, organic exhaust gas outlet II；Percolate vaporizer
Organic vapourss outlet organic Polluted Soil of connection be desorbed organic vapourss inlet port of container；Organic contamination soil desorption container
Organic exhaust gas outlet I connects the organic exhaust gas inlet port of off-gas condenser.
Described percolate vaporizer is adopted makes percolate be evaporated to organic heat steaming for 100～150 DEG C in temperature
The vaporizer of vapour.
The present invention evaporates heat steam repairing organic polluted soil of the gained rich in Organic substance using percolate, becomes useless
For treasured, reach with the purpose of dirty pollution treatment.
Present invention process is simple, and percolate is cheap and easy to get, and the heat steam obtained by percolate evaporation is to Organic Pollution
Volatility and half volatile organic contaminant removal efficiency are higher in soil, and removing processing cost is low, will not produce secondary pollution.
While repairing organic polluted soil of the invention, while percolate hardly degraded organic substance is removed,
Landfill leachate treatment cost is reduced, with good economic benefit and environmental benefit.
Description of the drawings
Fig. 1 is that this percolate is used for Organic Pollution soil restorative procedure process chart.
Specific embodiment
Below in conjunction with the accompanying drawings the present invention is described in further detail.
As shown in figure 1, the invention provides a kind of percolate is used for Organic Pollution soil restorative procedure, the method profit
The organic pollution in the organic vapor organics removal Polluted Soil for obtaining is heated with percolate, organic material contaminated soil is made
Repaired, restorative procedure is specific as follows：
1) by percolate (BOD5/CODcrFor 0.5～0.6) be put in percolate vaporizer, protect in vaporizer
Tiny structure is held, heating evaporation is carried out, temperature control produces organic heat steam at 100～150 DEG C；
2) Organic Pollution soil is put in organic Polluted Soil desorption container, by the organic of percolate vaporizer generation
Heat steam is passed through in the desorption container for filling organic material contaminated soil, keeps tiny structure in container, and extraction time is 10～
30min；
3) heat steam that organic pollution is produced with percolate heating evaporation in organic material contaminated soil is contacted, organic
Heat steam content of organics is high, high humidity, can significantly parse desorption organic contaminants in soil, processes organic material contaminated soil,
Complete organic polluted soil reparation；
4) organic mixed waste gas for producing are passed through in off-gas condenser, are condensed into after liquid and carry out again safe disposal, remaining
Percolate further process qualified discharge, do not produce secondary pollution.
A kind of percolate is used for Organic Pollution soil repair system, including percolate vaporizer, organic contamination
Soil desorption container, off-gas condenser；Percolate vaporizer is provided with percolate inlet port, the outlet of organic vapourss；Have
Machine Polluted Soil desorption container is provided with organic vapourss inlet port, organic contamination soil inlet port, clean soil is exported, organic exhaust gas go out
Mouth I；Off-gas condenser is provided with organic exhaust gas inlet port, organic exhaust gas outlet II；Organic vapourss of percolate vaporizer
The organic Polluted Soil of outlet connection is desorbed organic vapourss inlet port of container；The organic exhaust gas outlet of organic contamination soil desorption container
The organic exhaust gas inlet port of I connection off-gas condenser.
Described percolate vaporizer is adopted makes percolate be evaporated to organic heat steaming for 100～150 DEG C in temperature
The vaporizer of vapour.
The method environmental protection, with dirty pollution treatment, with good economic benefit and environmental benefit.
Preferred embodiment of the present utility model is the foregoing is only, this utility model is not restricted to, for ability
For the technical staff in domain, this utility model can have various modifications and variations.It is all it is of the present utility model spirit and principle it
Interior, any modification, equivalent substitution and improvements made etc. should be included within right of the present utility model.
Claims (6)
1. a kind of percolate is used for Organic Pollution soil restorative procedure, it is characterised in that：Comprise the following steps：
The first step：Percolate is put in percolate vaporizer, heating evaporation is carried out, temperature control is 100～150
℃；
Second step：Organic Pollution soil is put in organic Polluted Soil desorption container, by having that percolate vaporizer is produced
Machine heat steam is passed through in the organic contamination soil desorption container for filling organic material contaminated soil, and extraction time is 10～30min；
3rd step：The heat steam contact desorption that organic pollution is produced by percolate heating evaporation in organic material contaminated soil
Removed, completed organic polluted soil reparation；
4th step：The organic mixed waste gas of generation are passed through in off-gas condenser, are condensed into after liquid and carry out again safe disposal.
2. a kind of percolate according to claim 1 is used for Organic Pollution soil restorative procedure, it is characterised in that：Institute
State the BOD of percolate5/CODcrFor 0.5～0.6.
3. a kind of percolate according to claim 1 is used for Organic Pollution soil restorative procedure, it is characterised in that：Institute
Tiny structure is kept in the percolate vaporizer stated.
4. a kind of percolate according to claim 1 is used for Organic Pollution soil restorative procedure, it is characterised in that：Institute
Tiny structure is kept in the organic contamination soil desorption container stated.
5. a kind of percolate is used for Organic Pollution soil repair system, it is characterised in that：Including percolate vaporizer,
Organic contamination soil desorption container, off-gas condenser；Percolate vaporizer is provided with percolate inlet port, organic vapourss
Outlet；Organic contamination soil desorption container is provided with organic vapourss inlet port, organic contamination soil inlet port, clean soil and exports, has
Machine waste gas outlet I；Off-gas condenser is provided with organic exhaust gas inlet port, organic exhaust gas outlet II；Percolate vaporizer has
The organic Polluted Soil of machine vapourss outlet connection is desorbed organic vapourss inlet port of container；Organic contamination soil is desorbed the organic of container
Waste gas outlet I connects the organic exhaust gas inlet port of off-gas condenser.
6. a kind of percolate according to claim 5 is used for Organic Pollution soil repair system, it is characterised in that：Institute
The percolate vaporizer stated is using the vaporizer for making percolate that organic vapourss are evaporated in 100～150 DEG C of temperature.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510446583.5A CN104959375B (en) | 2015-07-27 | 2015-07-27 | Method and system for remediating organic matter polluted soil by use of landfill leachate |
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| CN201510446583.5A CN104959375B (en) | 2015-07-27 | 2015-07-27 | Method and system for remediating organic matter polluted soil by use of landfill leachate |
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| CN104959375B true CN104959375B (en) | 2017-04-12 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105618474B (en) * | 2016-02-25 | 2019-03-05 | 安徽省通源环境节能股份有限公司 | The device and method of distillation processing soil pollutant |
| CN106001083A (en) * | 2016-07-11 | 2016-10-12 | 佛山科学技术学院 | Organic matter contaminated soil restoring method and device |
| CN108772412A (en) * | 2018-05-23 | 2018-11-09 | 昆明理工大学 | A kind of method and system of repairing polluted soil |
| CN110479749B (en) * | 2019-08-23 | 2021-08-20 | 上海宝发环科技术有限公司 | Method and system for repairing organic contaminated soil for landfill leachate |
| CN114345916B (en) * | 2022-01-06 | 2022-11-18 | 中国科学院武汉岩土力学研究所 | Novel in-situ thermal evaporation displacement restoration test system for organic contaminated soil |
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| CN101665308A (en) * | 2009-09-11 | 2010-03-10 | 广州市市政工程设计研究院 | Method for advanced treatment of landfill leachate |
| CN201760437U (en) * | 2010-09-01 | 2011-03-16 | 达斯玛环境科技（北京）有限公司 | System for treating urban household garbage |
| CN102276322A (en) * | 2010-06-11 | 2011-12-14 | 中国科学院生态环境研究中心 | Controlled composting system and method for removing polycyclic aromatic hydrocarbon residues from soils |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101665308A (en) * | 2009-09-11 | 2010-03-10 | 广州市市政工程设计研究院 | Method for advanced treatment of landfill leachate |
| CN102276322A (en) * | 2010-06-11 | 2011-12-14 | 中国科学院生态环境研究中心 | Controlled composting system and method for removing polycyclic aromatic hydrocarbon residues from soils |
| CN201760437U (en) * | 2010-09-01 | 2011-03-16 | 达斯玛环境科技（北京）有限公司 | System for treating urban household garbage |
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Address after: 303 Hanzhongmen street, Gulou District, Nanjing City, Jiangsu Province Patentee after: Zhongcai International Intelligent Technology Co.,Ltd. Address before: 303 Hanzhongmen street, Gulou District, Nanjing City, Jiangsu Province Patentee before: NANJING KISEN INTERNATIONAL ENGINEERING Co.,Ltd. |
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