System and method for repairing polluted soil by pre-processing through ozone and enhancing micro-biological degradation

Abstract

The invention provides a system and a method for repairing polluted soil by pre-processing through ozone and enhancing micro-biological degradation; the polluted soil is polycyclic aromatic hydrocarbon polluted soil. The method provided by the invention comprises the following main repairing steps of: collecting and pre-processing a sample, preparing and uniformly mixing slurry, connecting to a repairing system, pre-processing through ozone, adding a biological surfactant and a liquid culture medium into a reaction container, and carrying out combination degradation and regular sampling and measuring till completing repairing. The system provided by the invention is simple to configure, convenient to operate and high in safety; aiming at the characteristics of being high in pollution degree of polycyclic aromatic hydrocarbon in soil, durable in pollution history, the micro-biological degradation combination technology is enhanced by adopting ozone pre-processing and biological surfactant solubilizing technologies; the limitation of the single technology is overcome; furthermore, the method provided by the invention is simple and convenient to operate, low in cost, short in operation period and good in eliminating effect; the eliminating rate of polycyclic aromatic hydrocarbon is above 93%; furthermore, secondary pollution cannot be generated; harm of polycyclic aromatic hydrocarbon polluted soil to human bodies and environments is greatly reduced; and a novel concept is provided for repairing soil.

Description

technical field [0001] The invention relates to the technical field of soil remediation, in particular to a system and method for remediating polycyclic aromatic hydrocarbon-contaminated soil by using ozone pretreatment to strengthen microbial degradation technology. Background technique [0002] In the process of rapid industrialization in our country, due to the lack of people's awareness of environmental protection, the environment on which we live has been severely damaged. Soil, as a natural resource for human beings, has not been spared, and the problem of soil environmental pollution has become more and more acute. Among them, the pollution phenomenon of polycyclic aromatic hydrocarbons (Polycyclic aromatic hydrocarbons, polycyclic aromatic hydrocarbons) with strong carcinogenic, teratogenic and mutagenic effects is very common. The paddy fields of Fushun Sanbaotun Team 4 in the Shenfu Irrigation District have become heavily polluted land due to more than 30 years of ...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a system and method for ozone pretreatment to strengthen microbial degradation and remediate contaminated soil, so as to solve the limitations of single remediation technology in the prior art, such as the problems of large amount of physical repair, high cost and small scope of application. , chemical technology is likely to lead to soil structure damage, biological activity decline, fertility degradation and secondary pollution problems, as well as the late restoration speed of biotechnology slows down, the overall restoration time is long, the removal rate of high-ring polycyclic aromatic hydrocarbons is low, and the restoration efficiency is not good. high problem

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