Method for repairing contaminated soil in coal-to-gas plant by adopting microbe-plant combined way

Abstract

The invention discloses a method for repairing contaminated soil in a coal-to-gas plant by adopting a microbe-plant combined way. The method comprises the following steps: adding an electronic receptor preparation in the contaminated soil so as to promote anaerobic degradation of polycyclic aromatic hydrocarbons and analysis of heavy metals; mixing and composting the contaminated soil with pig manure and a conditioning agent for several days; eluting partial heavy metals from the soil by using clear water; planting sedum alfredii hance and festuca arundinacea in the soil in a mixed way so as to extract the heavy metals from the soil and promote microbial degradation of the polycyclic aromatic hydrocarbons in the soil, wherein in the growth stage of plants, additives are sprayed periodically to enhance the repairing effect. Through the adoption of the method, the environment friendliness is very high, the repairing cost is low, and the ecological environment of the contaminated soil can be effectively restored, so that the method has a broad market prospect.

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 gradually been replaced, and some coal-to-gas plants have also been closed. During the long-term operation, the soils of these plants were polluted by polycyclic aromatic hydrocarbons and heavy metals to varying degrees (Reference 1: Thavamani P, Megharaj M, Krishnamurti GSR, et al. 2011. Finger printing of mixed contaminants from former manufactured gas plant (MGP) site soils: implications to bioremediation. Environmental International, 37(1):184–189). [0003] In recent years, with the acceleration of my country's urbanizat...

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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