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Leacheate and soil remediation method

A soil remediation and eluent technology, which is applied in the field of contaminated soil remediation, can solve the problems of limited treatment effect of remediation methods, limited treatment capacity, long remediation time, etc., and achieves good application prospects, easy promotion and implementation, and good removal effects.

Inactive Publication Date: 2018-12-21
BEIJING GEOENVIRON ENG & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the single microbial degradation method has a long repair period, and the water solubility of nitrobenzene itself is poor, and there are problems such as the limited ability of a single microorganism to treat high-concentration pollutants.
Due to the existence of the inert group nitro, a single repair method usually has limited treatment effect, long repair time, or high cost

Method used

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  • Leacheate and soil remediation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Soil remediation of a nitrobenzene-contaminated plot.

[0069] The former site of a chemical factory in Anhui, the soil pollutants exceeding the standard are 2-nitroaniline, m-nitrochlorobenzene, p-nitrochlorobenzene, and the polluted soil volume is 10257m 3 , the highest pollution concentration is 2-nitroaniline 166.62mg / kg, m-nitrochlorobenzene 568.72mg / kg, p-nitrochlorobenzene 657.74mg / kg, using this process for soil remediation, the specific implementation is as follows:

[0070] The soil porosity of this site is 0.33, that is, the pore volume is 3384.81m 3 . The eluent used is 36g / L n-butanol and 9g / L Tween 80, and the compound eluent is injected into the contaminated area through the injection well, and injected 17000m 3 Finally, the groundwater is extracted with extraction wells and collected on the ground for water treatment, solvent extraction is used to recover the eluent, and then injected 5 times 17000m 3 Eluent, every injection 17000m 3 Afterwards, use ...

Embodiment 2

[0076] Soil remediation of a nitrobenzene-contaminated plot.

[0077]A petrochemical site in Tianjin, the pollutant in the soil is nitrobenzene, the average concentration is 997mg / L, and the volume of contaminated earth is 1200m 3 , using this process for soil remediation, the specific implementation is as follows:

[0078] The soil porosity of this site is 0.35, that is, the pore volume is 420m 3 . The eluent used is 25g / L n-butanol and 6.6g / L Tween 80, and the compound eluent is injected into the contaminated area through the injection well, and injected 2100m 3 Afterwards, the groundwater is extracted with the extraction well and collected on the ground, then the water is treated, and the eluent is recovered by solvent extraction, and then injected into the 2100m 3 Afterwards, the groundwater is extracted with the extraction well, and the water is treated after being collected on the ground, and the eluent is recovered by solvent extraction, and then injected into the 21...

Embodiment 3

[0084] Soil remediation of a nitrotoluene-contaminated plot.

[0085] In a polluted site of a thermal power plant in Changsha, the pollutant in the soil is nitrotoluene, the highest concentration is 275mg / L, and the volume of polluted earth is 860m 3 , using this process for soil remediation, the specific implementation is as follows:

[0086] The soil porosity of this site is 0.30, that is, the pore volume is 258m 3 . The eluent used is 19.2g / L n-butanol and 4.8g / L Tween 80, and the compound eluent is injected into the contaminated area through the injection well, and injected 1120m 3 Afterwards, extract the groundwater with the extraction well and collect it on the ground, then carry out water treatment and use solvent extraction to recover the eluent, and then inject it into the 1120m 3 Finally, the groundwater is extracted with extraction wells, collected on the ground, treated for water, extracted with solvent to recover eluent, and then injected into 1120m 3 Finally,...

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Abstract

The invention relates to a leacheate and a soil remediation method, and belongs to the field of remediation of contaminated soil. The soil remediation method is characterized by comprising the following steps of providing the leacheate, wherein the leacheate comprises mixed n-butyl alcohol and tween 80; performing home position leaching on contaminated soil to be treated which is contaminated by nitrobenzene substances with the leacheate; and promoting degrading of the nitrobenzene substances by microorganisms in the contaminated soil to be treated through exogenous stimulation. According to the soil remediation method disclosed by the invention, home position leaching is combined with microorganism stimulation degrading, and through the leaching technology, high-concentration nitrobenzenepollutants can be quickly and massively removed; a surface active agent exists, so that favorable condition is created for subsequent biological remediation; aboriginal microorganisms are subjected to bio-stimulation; and after nutrient substances are added and the water ratio is regulated, low-concentration pollutants after leaching treatment are thoroughly removed, and the leacheate remained inthe soil can be effectively removed. The soil remediation method disclosed by the invention is reasonable in technology, and low in cost; the on-the-spot home position treatment conditions are completely simulated, and the workability is high; and the soil remediation method is easy to popularize and implement, and has favorable application prospects.

Description

technical field [0001] The invention relates to the field of remediation of contaminated soil, in particular to a leachate and a soil remediation method. Background technique [0002] Nitrobenzene compounds are a class of organic pollutants with stable chemical properties, high toxicity and easy accumulation in organisms. Nitrobenzene compounds are widely used in the production of pesticides, explosives, dyes, rubber, and other chemical products. Nitrobenzene pollutants in the environment mainly include nitrobenzene, nitrochlorobenzene, nitrotoluene, nitroaniline and nitrobenzoic acid. Nitrobenzene compounds have a wide range of uses, can pollute soil through waste water and waste residue, and can also enter the soil environment in large quantities due to accidents during transportation and production and improper handling of storage tanks. Most nitrobenzene compounds have the characteristics of stable chemical properties, high toxicity and easy bioaccumulation. Nitrobenz...

Claims

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Application Information

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IPC IPC(8): B09C1/10B09C1/02C09K17/20
CPCB09C1/02B09C1/10B09C2101/00C09K17/20
Inventor 吕正勇冯国杰孙佳玥朱湖地苗竹李淑彩范吉强宋登慧
Owner BEIJING GEOENVIRON ENG & TECH
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