A kind of method of repairing nitrobenzene polluted soil

Abstract

The invention relates to the technical field of contaminated soil remediation, in particular to a method for repairing nitrobenzene contaminated soil. The method comprises the following steps: carrying out in situ leaching and carrying out in situ remediation by using functional flora obtained by indigenous microorganism culture; a culture solution for indigenous microorganisms is prepared from aninducing substrate which is prepared from one or a combination of two of phenol and catechol. By synergizing in situ leaching with the indigenous microorganisms to perform enhanced repair on the nitrobenzene contaminated soil, the method has the advantages of obvious removing effect, fast-onset, stable and lasting effects, no need of long-term continuous addition, reasonable process, low cost, easiness in promotion and implementation as well as good environmental benefits, economic benefits and social benefits.

Description

technical field [0001] The invention relates to the technical field of contaminated soil remediation, in particular to a method for remediating nitrobenzene-contaminated soil. Background technique [0002] Nitrobenzene is an important chemical raw material, widely used in national defense, printing and dyeing, plastics, pesticides, medicine and other fields. With the acceleration of industrialization, more and more nitrobenzene substances enter the soil and groundwater along with industrial wastewater and waste residue. Nitrobenzene substances can be absorbed by the human body through the skin and respiratory tract, causing poisoning and even death, posing a serious threat to human health and the ecological environment. Many of these compounds have been listed as priority pollutants by the US Environmental Protection Agency (EPA). At present, the remediation methods of nitrobenzene-contaminated soil mainly include chemical reduction, chemical oxidation, thermal desorption, ...

AI Technical Summary

Problems solved by technology

At home and abroad, relatively mature biological bacterial agent products have been put into the market, but similar products are all exogenous strains, and the composition of the strains is relatively simple, and the adaptability to specific soil environments is poor, and it is difficult to become the dominant strain in the soil. Long-term continuous dosing is required, and the separation and construction of high-efficiency bacteria is difficult, and the research and development cycle is long. Therefore, most of the bacterial agent products are expensive and the operating cost is high, and the dosing of exogenous bacteria may also be due to differences with indigenous bacteria. Biosecurity concerns due to overlapping niches

In addition, relying on current biotechnology, only about 1% of the bacteria in nature can be isolated, and most of the bacteria cannot be isolated. Therefore, the huge potential of indigenous microorganisms in the ecological environment to degrade pollutants has not yet been fully explored.

[0005] The single bioremediation method also has obvious limitations, such as long repair period, limited ability to deal with high-concentration pollutants, etc.

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