Key technologies of microbial mining residual coal and CO2-fly ash co-filling in the impacted geological body of coal mining

The gob of coal mine is an important area for achieving the goal of “dual carbon” in China. The geological body formed by coal mining, which can enrich coalbed methane and provide substrate and space for later microbial activities and mineralization filling is defined as the mining influence body. The proposed technologies include the residual coal extraction through mining influence body microorganisms and the co-mineralization and filling of CO2-fly ash. The broad prospects of the technology in the secondary development of mining, from the perspectives of necessity and feasibility, are elaborated upon regarding the safe storage of CO2 and efficient disposal of fly ash solid waste in coal-fired power plants. The overall concept is to utilize mining influence body as a anaerobic fermentation “factory” and microorganisms as “workers” to process the existing raw materials of the “factories”including residual coal, thin coal seams, dispersed organic matter, and injected CO2. The ultimate goal is to produce metha