Underground coal gasification water pollution in-situ purification and restoration method

Abstract

The invention discloses an underground coal gasification water pollution in-situ purification and restoration method. The method includes the four parts of microbiological screening and acclimation, bacterium agent preparation and conveying, strain underground culture and gasification semicoke-microorganism combined purification and restoration. Residual gasification semicoke in the underground coal gasification process is adopted, a gasification semicoke-microorganism bacterium agent combination body is obtained through a series of procedures, and efficient purification and restoration of underground water pollution in a combustion space area are achieved. The residual gasification semicoke of the underground coal gasification serves as a carrier to provide a living space for rapid strain reproduction and serves as an adsorbent to enrich or adsorb pollutants in the underground water in the combustion space area, and high value added utilization of the residual gasification semicoke is achieved; and during pollutant purification and restoration, through the synergistic effect between gasification semicoke adsorption and microorganism degradation (or absorbing), absorbing (or immobilization) of inorganic pollutants and degradation and transformation (or absorbing) of organic pollutants in the underground water are achieved, underground construction is not needed, and secondary pollution is avoided.

Description

technical field [0001] The invention relates to an in-situ purification and restoration method for groundwater pollution, and is especially suitable for the in-situ purification and restoration of groundwater pollution caused by underground coal gasification. Background technique [0002] Underground coal gasification is a coal resource development technology that directly converts coal into gaseous fuel or chemical raw materials through controlled combustion underground. This technology integrates the three major processes of well construction, coal mining, and coal conversion. It changes traditional physical coal mining into chemical coal mining. It can not only develop coal seams that cannot be reached by underground mining, but also realize unmanned underground production. It is safe, The advantages of environmental protection, high efficiency, and good economic benefits are highly valued by countries all over the world, and are known as green mining technologies. [00...

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Problems solved by technology

[0008] The purpose of the present invention is aimed at the defects of the prior art of groundwater pollution and the particularity of underground coal gasification, and on the premise of making full use of the residual semi-coke of underground coal gasification, propose a process that is simple, easy to implement, low in cost, and efficient In-situ purification and remediation method of high coal underground gasification water pollution

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