CN102211795A - Method for regenerating eluant in organic polluted soil eluent - Google Patents
Method for regenerating eluant in organic polluted soil eluent Download PDFInfo
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- CN102211795A CN102211795A CN2011100993928A CN201110099392A CN102211795A CN 102211795 A CN102211795 A CN 102211795A CN 2011100993928 A CN2011100993928 A CN 2011100993928A CN 201110099392 A CN201110099392 A CN 201110099392A CN 102211795 A CN102211795 A CN 102211795A
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Abstract
The invention belongs to the technical field of soil pollution repair for environment protection and relates to a method for treating an organic polluted soil synergistic eluent. The method comprises the step: mixing the eluent obtained by eluting and repairing the organic polluted soil with activated carbon according to the absorbability difference of the activated carbon on organic pollutants and a synergistic eluant for selectively absorbing and removing the pollutants in the eluent so as to achieve the regeneration and reuse of the eluant. The method is environmentally-friendly, has the advantages that the operation is simple, the cost is low and the like, and is an effective method for treatment of organic polluted soil synergistic eluents and regeneration of eluents.
Description
Technical field
The invention belongs to environment protection and chemical field, relate to soil remediation, relate in particular to the treatment process of organic polluted soil elutriant.
Background technology
Along with honouring an agreement and urbanization process of China's " about Convention of Stockholm of persistence organic pollutant (POPs) ", a large amount of insecticide factories, chemical plant are closed or are moved, and a large amount of contaminated sites of leaving at surrounding city are being faced with secondary development.These places much relate to the high-concentration hardly-degradable organic contamination, and human settlement's safety has been constituted serious threat, press for the soil of these contaminated sites is repaired.Synergy wash-out recovery technique has characteristics fast and efficiently, has tangible technical superiority in repair in the difficult volatility organic contamination of high density place.Synergy eluent commonly used has chemical/biological tensio-active agent, organic cosolvent and cyclodextrin etc.Wherein triton x-100 and rhamnolipid are respectively widely used chemistry and bio-surfactant.Soil synergy wash-out can be divided into original position wash-out and dystopy wash-out again by embodiment.Original position wash-out (claim again original position flushing) is meant under the effect of hydraulic pressure, water or the aqueous solution that contains the synergy eluent introduced polluted soil layer, and pollutent is separated from soil.And the waste liquid that is dissolved with pollutent is extracted out by extraction well in the downstream, processes after gathering system is collected again.The dystopy wash-out is that contaminated soil is excavated out, carries out mechanically mixing with the synergy elutriant after certain pre-treatment, and pollutent is transferred in the elutriant, carries out the process of mud-water separation and elutriant aftertreatment again.The reparation that the synergy wash-out is used for petroleum hydrocarbon compound, polycyclic aromatic hydrocarbons and the multiple organic polluted soil of agrochemical has obtained broad research and engineering application.
It is the important step that soil synergy wash-out is repaired that elutriant is handled, and the regeneration of eluent such as tensio-active agent can reduce technical costs greatly in the elutriant.But at present both at home and abroad for the processing of elutriant particularly the recycling of tensio-active agent lack otherwise effective technique.Existing in general elutriant treatment technology mainly comprises precipitation/flocculence, membrane sepn/method of enrichment, air stripping method, solvent extration, biology/chemical oxidation edman degradation Edman etc.Precipitation/flocculation usually adds in the elutriant that contains eluent and organic/heavy metal contamination after soda-lime or iron(ic) chloride etc. make eluent and pollutent precipitate simultaneously/flocculate, and mud is burned or landfill disposal again.For ionogenic surfactant, add gegenion usually and make surfactant precipitate.Precipitation/flocculence can't be realized the regeneration of separating of pollutent and tensio-active agent and tensio-active agent.Air stripping is to expose to the sun into air in the elutriant that contains the volatile pollutent, makes pollutent peel off out the also process of collection and treatment from water.This method is effective at volatile organic matter, can realize the regeneration of tensio-active agent in the elutriant, but is difficult to obtain the ideal effect for the elutriant that contains difficult volatile organic matter.Membrane sepn/concentrate is to utilize means such as micro-filtration, ultrafiltration, reverse osmosis that the elutriant of large volume is handled, and obtains containing the concentrated solution and the cleaning water of pollutent and eluent, again concentrated solution is handled or is disposed.This method can reduce the volume of the elutriant of ultimate demand processing, can reduce processing cost with the other technologies coupling.But embrane method still can not realize separating of eluent and pollutent, does not reach the purpose of medicament direct reuse.Solvent extraction also claims liquid-liquid extraction, is to utilize organic solvent such as normal hexane, octane etc. that the pollutent in the elutriant is extracted, thereby realizes eluent regenerated effect.Though solvent extration is better for the elutriant treatment effect of difficult volatile organic contaminant, factors such as solvent cost and solvent reclamation apparatus expensive cause the overall process cost higher.Chemical oxidization method and biological degradation often by chemical oxidation reaction or microbiological deterioration process with the removal of degrading simultaneously of tensio-active agent and pollutent, thereby also can't reach effective reuse of eluent.
Gac has obtained widespread use as a kind of sorbent material efficiently in feedwater and waste water advanced processing.Gac is directly related with the water soluble characteristic of material to organic adsorptive power.For the elutriant that contains indissoluble organic pollutant and water soluble surfactant active simultaneously, can utilize gac to the two adsorptive power than big-difference, the pollutent selective adsorption is removed, thereby realizes the regeneration of eluent effectively.This method is simple to operate, and technical costs is relatively low, but is the technology that a kind of mass-producing is used.
Summary of the invention
Task of the present invention provides the method for eluent in a kind of organic polluted soil elutriant of regenerating, to overcome the particularly deficiency of eluent regeneration techniques of existing organic polluted soil synergy elutriant treatment technology.
Realize that technical scheme of the present invention is:
The method of eluent is in this regeneration organic polluted soil synergy elutriant provided by the invention: the elutriant after soil synergy wash-out is repaired mixes with gac, with the organic pollutant in the charcoal absorption removal elutriant, eluent is retained in aqueous phase, thereby realizes eluent regeneration.
The pollutent of the organic polluted soil described in the aforesaid method is a hydrophobic organic, and wherein said hydrophobic organic is organochlorine insecticide, polycyclic aromatic hydrocarbons or polychlorobiphenyl.
Elutriant described in the aforesaid method can be the original position elutriant that obtains through the original position wash-out, also can be the dystopy elutriant that obtains through the dystopy wash-out.
Eluent described in the aforesaid method can be bio-surfactant, chemical surfactant, organic cosolvent or cyclodextrin, and wherein said bio-surfactant is a rhamnolipid; Described chemical surfactant is triton x-100, tween 80 or sodium laurylsulfonate; Described organic cosolvent is ethanol or polyoxyethylene glycol.
Gac described in the aforesaid method is granulated active carbon, Powdered Activated Carbon or activated carbon fiber.Powdered Activated Carbon particle diameter＜100 orders, granulated active carbon particle diameter are 14～50 orders.
Elutriant described in the aforesaid method and gac blended mode can be mechanical oscillation or stirring, also can be to make elutriant pass active carbon adsorption column or adsorption tanks with pump pressure.
Elutriant after the present invention repairs soil synergy wash-out mixes with gac, and with the organic pollutant in the charcoal absorption removal elutriant, eluent is retained in aqueous phase, thereby realizes eluent regeneration.Its know-why is to utilize the significant difference of gac to organic pollutant and synergy eluent adsorptive power, and optionally the pollutent in the elutriant is removed in absorption, realizes the regeneration and the reuse of eluent.
Method provided by the present invention can effectively reach the purpose of removing pollutent and regenerative elution agent in the organic contamination synergy elutriant, significantly cuts down medicament and technical costs that the synergy wash-out is repaired.Processing condition maturation, equipment that this method adopted are simple, easy to operate, and this method itself has environmental friendliness, advantage such as with low cost, are applicable to the processing of the synergy elutriant of multiple organic polluted soil.
Embodiment
Embodiment 1
Preparation Perchlorobenzene concentration is that 1mg/L, rhamnolipid concentration are the mixed solution of 7.5g/L, as the rhamnolipid elutriant of simulation Perchlorobenzene contaminated soil.Dosage by 10g/L adds Powdered Activated Carbon in above-mentioned elutriant, behind 30 ℃ of constant temperature vibration 6h, centrifugation is got supernatant liquor and analyzed Perchlorobenzene and rhamnolipid content.When measuring Perchlorobenzene, be extraction agent with the normal hexane, extraction is than being 1: 1, and the Perchlorobenzene in the extraction liquid is measured with gas-chromatography-electron capture detector.Rhamnolipid adopts surface tension instrument-quantitative around-France mensuration.The result shows: the HCB in the rhamnolipid solution more than 98% can be removed by charcoal absorption, and corresponding rhamnolipid adsorption losses is about 17%.
Investigate Perchlorobenzene and rhamnolipid starting point concentration simultaneously and respectively gac is selected the influence of adsorption effect.The result shows: the Perchlorobenzene initial content is 1～10mg/L, rhamnolipid concentration 7.5g/L, and during Powdered Activated Carbon dosage 10g/L, the clearance of HCB is between 88%～97%, and the rhamnolipid rate of loss is 7%～18%.And work as the rhamnolipid starting point concentration is 3.3～25g/L, HCB concentration 1mg/L, and during Powdered Activated Carbon dosage 10g/L, the clearance of HCB is between 79%～97%, and the rhamnolipid loss is 7%～19%.Show based on the above results and adopt Powdered Activated Carbon to select absorbing process can remove the regeneration of the chlordene benzo realization rhamnolipid elutriant in the rhamnolipid elutriant effectively.
Embodiment 2
Obtain the Perchlorobenzene contaminated soil near the chemical plant, Wuhan, through air-dry, grind, sieve, recording hexachlorobenzene content is 20.7mg/kg.The rhamnolipid powder of buying is mixed with the solution that concentration is 25g/L, by 1: 10 solid-to-liquid ratio and mixing with soil, 25 ℃ of vibration 48h on constant temperature oscillator.After the centrifugation, supernatant liquor is crossed 0.45 μ m cellulose acetate film (above procedure definition is a wash-out).Press dosage Powdered Activated Carbon in adding filtrate of 10g/L again, behind 30 ℃ of vibration 6h, centrifugation obtains regenerated rhamnolipid solution (being defined as primary sorption).Measure Perchlorobenzene and rhamnolipid content in the elutriant of primary sorption front and back respectively.Measuring method is with application example 1.The result shows: the eluting rate of Perchlorobenzene is 71% in the soil, and through after the adsorption treatment of Powdered Activated Carbon, the clearance of Perchlorobenzene is 89% in the rhamnolipid elutriant, and the adsorption losses of rhamnolipid is 5%.Thereby Powdered Activated Carbon is more satisfactory to the selective adsorption effect of Perchlorobenzene contaminated soil rhamnolipid elutriant.
Simultaneously the elution property through the rhamnolipid of regeneration of activated carbon is estimated.Concrete mode is: other gets a Perchlorobenzene contaminated soil, carries out wash-out reparation (being defined as the secondary wash-out) with above-mentioned regenerated rhamnolipid solution as elutriant, then the elutriant that obtains is carried out charcoal absorption regeneration (being defined as second adsorption) again.Rhamnolipid solution after again second adsorption being handled is used for the 3rd part of Perchlorobenzene of wash-out and pollutes soil (being defined as wash-out three times).Analyze Perchlorobenzene and rhamnolipid content in each stepwise elution liquid.The result shows that the eluting rate of Perchlorobenzene in secondary and three wash-outs is respectively 63% and 59%, and the adsorption rate of Perchlorobenzene is 92% in the second adsorption, and the rate of loss of final rhamnolipid is less than 33%.The rhamnolipid that shows regeneration of activated carbon can be effectively used to repeatedly wash-out reparation.
Rhamnolipid solution after the investigation regeneration simultaneously is to repeating the effect of wash-out with a soil.Other operations are the same, just with the rhamnolipid solution behind the primary sorption again with wash-out after mixing with soil, carry out the repetition wash-out.The result shows that through twice wash-out total clearance of Perchlorobenzene can reach more than 89% in the soil, and the rhamnolipid total losses is less than 25%.Show that the repetition wash-out that regenerated rhamnolipid solution is used for soil can improve the total clearance of pollutent effectively, thereby can significantly not increase rehabilitation cost reaching under the prerequisite of repairing target.
Embodiment 3
Preparation Perchlorobenzene concentration is that 1mg/L, triton x-100 concentration are the mixed solution of 6.5g/L (10mmol/L), as the triton x-100 elutriant of simulation Perchlorobenzene contaminated soil.The dosage of pressing 10g/L adds the granulated active carbon of particle diameter between 14～50 orders in above-mentioned elutriant, behind 30 ℃ of constant temperature vibration 6h, centrifugation is got supernatant liquor and analyzed Perchlorobenzene and triton x-100 content.Perchlorobenzene is measured with gas-chromatography-electron capture detector behind n-hexane extraction.Triton x-100 utilizes high performance liquid chromatography-UV detector-C18 reverse-phase chromatographic column to measure.The result shows that granulated active carbon can remove in the triton x-100 solution 95% Perchlorobenzene; the rate of loss of triton x-100 is about 17% simultaneously, shows to adopt particle to select absorbing process can remove the regeneration of the chlordene benzo realization triton x-100 elutriant in the triton x-100 elutriant effectively.
Claims (10)
1. the method for eluent in the organic polluted soil synergy elutriant of regenerating, it is characterized in that the elutriant after soil synergy wash-out is repaired mixes with gac, with the organic pollutant in the charcoal absorption removal elutriant, eluent is retained in aqueous phase, thereby realizes eluent regeneration.
2. method according to claim 1 is characterized in that, the pollutent of described organic polluted soil is a hydrophobic organic.
3. method according to claim 2 is characterized in that, described hydrophobic organic is organochlorine insecticide, polycyclic aromatic hydrocarbons or polychlorobiphenyl.
4. method according to claim 1 is characterized in that, described elutriant can be the original position elutriant that obtains through the original position wash-out, also can be the dystopy elutriant that obtains through the dystopy wash-out.
5. method according to claim 1 is characterized in that, described eluent can be bio-surfactant, chemical surfactant, organic cosolvent or cyclodextrin.
6. method according to claim 5 is characterized in that described bio-surfactant is a rhamnolipid.
7. method according to claim 5 is characterized in that, described chemical surfactant is triton x-100, tween 80 or sodium laurylsulfonate.
8. method according to claim 5 is characterized in that, described organic cosolvent is ethanol or polyoxyethylene glycol.
9. method according to claim 1 is characterized in that, described gac is granulated active carbon, Powdered Activated Carbon or activated carbon fiber.
10. method according to claim 1 is characterized in that, the hybrid mode of elutriant and gac can be mechanical oscillation or stirring, also can be to make elutriant pass active carbon adsorption column or adsorption tanks with pump pressure.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102495016A (en) * | 2011-12-12 | 2012-06-13 | 厦门大学 | Method for detecting polychlorinated biphenyl (PCB) pollutants in soil |
| CN104787832A (en) * | 2015-03-26 | 2015-07-22 | 华南理工大学 | Method of removing polychlorinated biphenyl and recovering tween-80 from waste soil eluent and application of method |
| CN104876405A (en) * | 2015-04-21 | 2015-09-02 | 南开大学 | Method for cleaning aged oil sludge |
| CN106077061A (en) * | 2016-06-15 | 2016-11-09 | 东北林业大学 | A kind of surfactant wash-out and the method for fenton-type reagent combine d bioremediation organochlorine pesticide pollution soil |
| CN106116070A (en) * | 2016-07-29 | 2016-11-16 | 张倩 | A kind of acetone sludge treating agent and preparation method thereof |
| CN106116068A (en) * | 2016-07-29 | 2016-11-16 | 张倩 | A kind of Niran sludge treating agent and preparation method thereof |
| CN107963628A (en) * | 2017-11-23 | 2018-04-27 | 武汉大学 | The preparation of walnut shell activated carbon and its method for eluent in adsorption recovery phenanthrene-polluted soil leacheate |
| CN111097791A (en) * | 2019-12-30 | 2020-05-05 | 苏州同和环保工程有限公司 | Remediation method for pesticide-contaminated soil |
| CN111346910A (en) * | 2020-02-18 | 2020-06-30 | 重庆大学 | Method for restoring petroleum hydrocarbon contaminated soil based on sodium percarbonate |
| CN111872100A (en) * | 2020-07-14 | 2020-11-03 | 天津绿缘环保工程股份有限公司 | Method for restoring petroleum hydrocarbon contaminated soil |
| CN112619838A (en) * | 2020-12-24 | 2021-04-09 | 中国科学院沈阳应用生态研究所 | Cleaning-heat treatment coupling process for high-concentration petroleum-polluted soil |
| CN112980456A (en) * | 2021-03-09 | 2021-06-18 | 生态环境部南京环境科学研究所 | Environment-friendly eluent for restoring organochlorine pesticide polluted soil and preparation method thereof |
| CN112979043A (en) * | 2021-03-05 | 2021-06-18 | 生态环境部南京环境科学研究所 | Purification and recovery device of synergistic eluent for restoring organochlorine pesticide contaminated soil |
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Cited By (16)
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| CN102495016A (en) * | 2011-12-12 | 2012-06-13 | 厦门大学 | Method for detecting polychlorinated biphenyl (PCB) pollutants in soil |
| CN102495016B (en) * | 2011-12-12 | 2013-03-27 | 厦门大学 | Method for detecting polychlorinated biphenyl (PCB) pollutants in soil |
| CN104787832A (en) * | 2015-03-26 | 2015-07-22 | 华南理工大学 | Method of removing polychlorinated biphenyl and recovering tween-80 from waste soil eluent and application of method |
| CN104876405A (en) * | 2015-04-21 | 2015-09-02 | 南开大学 | Method for cleaning aged oil sludge |
| CN106077061B (en) * | 2016-06-15 | 2019-11-08 | 东北林业大学 | A kind of method of surfactant elution and fenton-type reagent joint reparation organochlorine pesticide pollution soil |
| CN106077061A (en) * | 2016-06-15 | 2016-11-09 | 东北林业大学 | A kind of surfactant wash-out and the method for fenton-type reagent combine d bioremediation organochlorine pesticide pollution soil |
| CN106116070A (en) * | 2016-07-29 | 2016-11-16 | 张倩 | A kind of acetone sludge treating agent and preparation method thereof |
| CN106116068A (en) * | 2016-07-29 | 2016-11-16 | 张倩 | A kind of Niran sludge treating agent and preparation method thereof |
| CN107963628A (en) * | 2017-11-23 | 2018-04-27 | 武汉大学 | The preparation of walnut shell activated carbon and its method for eluent in adsorption recovery phenanthrene-polluted soil leacheate |
| CN107963628B (en) * | 2017-11-23 | 2020-06-09 | 武汉大学 | Preparation of walnut shell activated carbon and method for adsorbing and recovering eluent in phenanthrene-polluted soil eluent by using walnut shell activated carbon |
| CN111097791A (en) * | 2019-12-30 | 2020-05-05 | 苏州同和环保工程有限公司 | Remediation method for pesticide-contaminated soil |
| CN111346910A (en) * | 2020-02-18 | 2020-06-30 | 重庆大学 | Method for restoring petroleum hydrocarbon contaminated soil based on sodium percarbonate |
| CN111872100A (en) * | 2020-07-14 | 2020-11-03 | 天津绿缘环保工程股份有限公司 | Method for restoring petroleum hydrocarbon contaminated soil |
| CN112619838A (en) * | 2020-12-24 | 2021-04-09 | 中国科学院沈阳应用生态研究所 | Cleaning-heat treatment coupling process for high-concentration petroleum-polluted soil |
| CN112979043A (en) * | 2021-03-05 | 2021-06-18 | 生态环境部南京环境科学研究所 | Purification and recovery device of synergistic eluent for restoring organochlorine pesticide contaminated soil |
| CN112980456A (en) * | 2021-03-09 | 2021-06-18 | 生态环境部南京环境科学研究所 | Environment-friendly eluent for restoring organochlorine pesticide polluted soil and preparation method thereof |
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Application publication date: 20111012 |