A method for remediation of polluted soil in coal gas plant using microorganism-plant joint

Abstract

The invention discloses a method for using microorganisms and plants to jointly restore polluted soil in a coal gas plant. Electron acceptor preparations are added to the polluted soil to promote the analysis of heavy metals in anaerobic degradation of polycyclic aromatic hydrocarbons, and then combined with pig manure and conditioning agents After composting for several days, the soil was washed with water to wash off part of the heavy metals, and then the soil was mixed with Sedum sedum and tall fescue to extract heavy metals from the soil and promote the microbial degradation of polycyclic aromatic hydrocarbons in the soil. Additives are sprayed periodically during plant growth to enhance restoration. The invention has high environmental friendliness, low restoration cost and can effectively restore the ecological environment of polluted soil, so it has broad market prospects.

Description

technical field [0001] The invention relates to the technical field of soil remediation of polluted sites, in particular to a method for jointly remediating polluted soil in a coal gas plant by using microorganisms and plants. Background technique [0002] Coal-to-gas has played an important role in the process of gasification of cities in my country and even in the world. With the continuous development and utilization of natural gas, coal-to-gas has been gradually replaced, and some coal-to-gas plants have also been closed. During the long-term operation, the soil in these plant areas has been polluted by polycyclic aromatic hydrocarbons and heavy metals to varying degrees (Document 1: ThavamaniP, MegharajM, KrishnamurtiGSR, et al. 2011. Fingerprinting of mixed pollutants from former manufactured gasplant (MGP) sites soils: implications to bioremediation. :184–189). [0003] In recent years, with the acceleration of my country's urbanization process and industrial adjust...

AI Technical Summary

Problems solved by technology

Application No. 201210486441.8 provides a method for remediating polycyclic aromatic hydrocarbons and heavy metal-contaminated sites. This method mainly uses methyl β-cyclodextrin to wash the soil, and then inserts polycyclic aromatic hydrocarbon-degrading bacteria for bioremediation. The rinsing process of this method involves the use of heating and ultrasonic instruments. If it is aimed at large-scale restoration engineering practice, its implementation is difficult and costly

In addition, the application number 201010002824.4 provides a method for strengthening the composting of animal manure to treat polluted soil by adding biosurfactants and polycyclic aromatic hydrocarbon degrading bacteria, but the exogenous degrading bacteria introduced by this method cannot be effective against indigenous microorganisms in some cases. Form a competitive advantage and play an effective role, and do not involve the problem of heavy metal pollution

[0007] The main disadvantages of the existing technology are that there are fewer types of organic-heavy metal pollutants, the environmental friendliness of chemical eluents is poor, and there is less consideration for the restoration of the ecological function diversity of the soil environment after restoration.

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