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This paper studies the effect of vegetal conditions on Desulfovibrio desulfuricans and Desulfotomaculum sp. and compares their growth under the same conditions. desulfovibrio desulfuricans is selected as eligible strain. As the test results shows, the optimum growth range of the Desulfovibrio desulfuricans includes pH which is between 5 and 8, temperature which is above 20 , inoculating amount above 20%. Desulfovibrio desulfuricans also can grow when pH is 4 and the removal efficiency of SO 4 2became higher as the increasment of inoculating amount.The effect of original concentration of SO 4 2on absolute treatment quantity is not significant, but removal efficiency of SO 4 2became lower as the increase of the original concentration.Bioreduction ability is decreasing with temperature declining. Keywords--caid coal mine drainage; sulfate reducing bacteria (SRB) ; growth conditions of redoxcell

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Considering the urgent need for disposal of red mud and the comprehensive treatment of coal mined-out areas, this paper presented red mud-based cementitious paste filling material (RMFM) to achieve the purpose of green filling treatment. However, the solidification performance of alkaline RMFM for contaminants can be affected when in contact with acid goaf water in practice, which may in turn causes secondary pollution to the surroundings. The leaching tests of RMFM under different pH and redox potential (Eh) conditions were designed to investigate the effects of environmental elements on the solidification performance of RMFM, and primarily investigated the treatment effectiveness of RMFM on goaf water. The test results manifest that the acidic and oxidizing environments could damage the hydration products generated by alkali and sulfate activation, thus affecting the solidification performance, while the alkaline and reducing environments could effectively prevent the release of the contaminants by enhancing the degree of alkali activation and inhibiting oxidation acid forming process. In the possible exposure environment, RMFM could effectively stabilize its own pollutants without secondary pollution. In addition, the powder RMFM samples had significant removal effects on heavy metals, the values of Cu, Pb, and As removal efficiency all reached more than 96.15%.