Selection of water quality evaluation method of mine water inflow based on multiple methods

In order to reduce the negative impact of mine water gushing on the environment, it is necessary to evaluate the water quality. Taking the Pingdingshan coalfield as the research object, six components including chroma, turbidity, total dissolved solids, total hardness, Cl-, SO4 (2-) were selected as index factors. Composite weight is calculated by variable weight theory, and the water quality of mine gushing water is evaluated by matter element extension model, fuzzy variable set model, ayesian theory, nemerow index. The deviation of four evaluation methods is calculated based on the specially constructed mathematical model. The research results show that the order of the deviation of the evaluation method from small to large is: fuzzy variable set method (5.5) < matter-element extension method (8) < bayesian statistical method (10) < nemerow index method (17). Fuzzy variable set method is more suitable for Pingdingshan coalfield Mine gushing water quality assessment. We hope this research can provide a certain reference value for the evaluation of mine water quality in the future.