Chemical elution-plant combined remediation method of polybrominated diphenyl ether and heavy metal compound contaminated soil

Abstract

The invention discloses a chemical elution-plant combined remediation method of polybrominated diphenyl ether and heavy metal compound contaminated soil. Firstly, contaminated soil particles are crushed and screened; then, the soil particles are put in soil multiple ectopic remediation equipment, mixed eluant is added, and a ultrasonic reinforcement and heating treatment mode is adopted to perform the continuous ectopic synergy elution; glyptostrobus pensilis is inoculated in the eluted soil, nutrient source buffer solution being 15-30 mass% of the soil is applied; and the remediation is finished through manual cultivation growth. The method can synchronously and efficiently elute polybrominated diphenyl ether and multiple heavy metals in the soil; and the inoculation of the glyptostrobus pensilis and the addition of external source nutrient substances facilitate deep degradation of the residual polybrominated diphenyl ether after the elution of the soil, and facilitate the recovery of ecological function diversity and stability of polluted soil environmental microorganisms.

Description

[0001] technical field [0002] The invention belongs to the technical field of remediation of organic-inorganic composite polluted soil, and in particular relates to a rapid chemical elution-plant combined restoration method of polychlorinated diphenyl ether and multiple heavy metal composite polluted soil. [0003] Background technique [0004] In recent years, with the rapid development of my country's economy and the continuous improvement of people's living standards, a large number of new electronic products (such as: computers, mobile phones, printers, scanners, navigators and satellite TVs, etc.) have gradually been widely used by people. The replacement and upgrading cycle of electronic science and technology has become shorter, and a large number of waste electronic waste products have been quickly eliminated and discarded, resulting in the emergence of a large number of polluted areas around cities and towns in my country where electronic waste accumulates. In suc...

AI Technical Summary

Problems solved by technology

Among them, the application numbers: CN201110278862 and CN201410071012 respectively provide a method for high-efficiency PBDE degradation bacteria and its application, and a method for remediating PBDE-contaminated soil granules and its application, but these two methods are mainly aimed at single PBDE The degradation of ether organic pollutants does not take into account the situation of compound polluted soil with polybrominated diphenyl ethers and heavy metals. At the same time, the bacterial strain provided in CN201110278862 is mainly aimed at degrading low-concentration polybrominated diphenyl ethers in soil, and the white-rot fungus hyphae fermentation provided in CN201410071012 The solution is mainly aimed at degrading low-concentration polybrominated diphenyl ethers in soil, but the effect is not good for the remediation of high-concentration polluted soil; application number: CN201310545065 provides a method for electrically remediating polybrominated diphenyl ether-contaminated soil, but this method requires Only when the soil pH value is adjusted to 3-4 can the efficient degradation of polybrominated diphenyl ethers be achieved, so the disturbance and damage to the ecological function of the restored soil are relatively large, and the restoration of the environmental ecological function of the restored soil is not taken into account; application number: CN201010220381 Provides a microbial fuel cell and its application method in the degradation of polybrominated diphenyl ethers, but this method is mainly aimed at the degradation of polybrominated diphenyl ethers in the water environment, and it is difficult to carry out remediation engineering operations on large-scale polybrominated diphenyl ether-contaminated soil areas; application No.: CN201310077333 and CN200510086490 respectively provide a method for in-situ remediation of PBDE-contaminated soil using nano-Ni / Fe bimetallic particle composite materials and a method for rapidly degrading PBDEs with nano-iron powder. Although these two methods can effectively degrade The parent compound of polybrominated diphenyl ether is removed, but the degradation products of polybrominated diphenyl ether still remain in the soil, and the physiological toxicity and environmental risk of its degradation secondary products or nano-remediation materials in the soil environment are not considered; application number: CN201310636248, provided A new type of soil purifying agent and its application method for the remediation of polybrominated diphenyl ether-contaminated soil is proposed. This method uses anionic surfactants and iron compounds to form metal complexes and add them to the soil to improve the bioavailability of polybrominated diphenyl ethers. Through the removal of soil filtrate, the removal of polybrominated diphenyl ethers is realized, but this method is only aimed at the removal of a single low-concentration polybrominated diphenyl ether, and has not considered the situation of heavy metal complex pollution at the same time; application number: CN200810239353, provides a surfactant to enhance A method for degrading polybrominated diphenyl ethers combined with UV technology, but this method is mainly aimed at the solubilization and photodegradation of polybrominated diphenyl ethers in water, and the chemical surfactants used have certain environmental toxicity risks. Take into account less

[0006] Through relevant literature review and patent search, no publication and acceptance of chemical elution and remediation technology related to polybrominated diphenyl ether and heavy metal compound polluted soil was found, which is the closest to the present invention The existing technology is surfactant elution technology, application number: CN201010558286.7 provides a method for rinsing and repairing organic-inorganic composite polluted soil, the method mainly uses sodium lauryl sulfate and diethylamine disuccinate Acid leaching polluted soil, but the organic pollutants aimed at by this method are mainly chlorobenzenes and trichlorethylene organic pollutants, and the heavy metals aimed at are mainly copper and chromium polluted soil; application numbers: CN200810123622 and CN201210486441.8 respectively provide A method for leaching and remediating heavy metal-organic compound polluted soil and a chemical-microbial joint remediation method for compound polluted soil of polycyclic aromatic hydrocarbons and heavy metals, both of which are aimed at the compound pollution of polycyclic aromatic hydrocarbons and heavy metals Soil remediation, lack of effectiveness verification for PBDE and multiple heavy metal compound polluted soil

[0007] The main defects in the existing technology are: lack of synergistic elution technology for high-concentration polybrominated diphenyl ethers and heavy metal compound polluted soil at the same time, organic-inorganic pollution There are fewer types of pollutants, it is difficult to achieve simultaneous efficient elution and removal of organic-inorganic pollutants, the selected chemical eluents are less environmentally friendly, the removal effect of pollutants is not complete, and the restoration of soil environmental ecological functions after elution is not ideal. , the research and development of related collaborative supporting repair technologies is obviously insufficient, so the market application prospect of existing technologies is not clear

The main reasons for [0008] defects are: In recent years, there have been a large number of combined PBDE and heavy metal pollution sites caused by the irregular recycling operations of e-waste treatment plants. Scientists have paid relatively little attention to and researched and developed such contaminated soil remediation technologies; existing remediation technologies are mainly aimed at farmland soils with relatively low pollution concentrations, and the remediation effect is not good for site soils with high pollution concentrations; Remediation technology has little consideration for the restoration of the diversity and stability of microbial ecological functions in the soil environment after remediation

Images