Hydrochemical-microbial field interaction and mathematical model construction of the water quality formation and evolution in coal mine
The formation and evolution process of mine water quality is very complex,con-trolled by multiple fields such as hydrodynamic field,hydrochemical field,and microbial field.Establishing a mathematical model for the coupling effect between hydrochemical and microbial fields is an important aspect of constructing a multi field coupling model.After constructing a mathematical model of the hydrodynamic field,this study selected typical mines in North China with high salinity(SO4-Na type)as the main characteristic of mine water quality as the model research area to conduct indoor microcosmic simulation experiments.The water quality evolution process under the coupling effect of hydrochemicalwas exploredand microbial fields methods such as hydrogeochemical testing and high-throughput microbial sequencing were used.The comparative test results of three groups:fully enclosed,pre semi enclosed,and high coal show that the characteristic pollutant in the fully enclosed experimental group system is SO4,with an overall increase and then decrease in concentration.As of 365 days,the concen-tration decreased by 14.3％compared to the highest point.The concentration of SO42-in the early stage of semi closure was lower than that in the closed experimental system,while in the later stage of closure it was higher than that in the fully closed experimental group,indicating that oxygen has a significant impact on the source and destination of SO42-.The obvious H2S odor in the early stage of the experiment indicates that sulfate reduction has occurred in the system.The abundance of related bacterial genera(mainly including sulfur oxidizing bacteria and sulfate reducing bacteria)involved in the sulfur cycle is closely related to the concentration changes of SO42-.Based on the comprehensive analysis of the experimental results,there are four main effects in the system that affect the concentration of SO42-,including adsorption/de-sorption,dissolution/precipitation,pyrite oxidation by sulfur oxidizing bacteria,and sulfate reduction by sulfate reducing bacteria.On this basis,the four mathematical models affecting the concentration of SO4-were established respectively,and coupled with the microbial field,a hydrochemical-microbial field mathematical model for the formation and evolution of coal mine water quality was constructed.This model reflects the inherent mechanism of water qual-ity evolution under the interaction of hydrochemistry and microorganisms,laying the founda-tion for the subsequent construction of a multi field coupled numerical model for groundwater pollution in coal mining areas.
coal mine water qualitybiogeochemical processeshydrochemical fieldmicrobial fieldbiogeochemical processes
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