硫酸盐还原菌利用玉米发酵液为碳源还原地下水中的硫酸盐

Reduction of Sulfate in Groundwater by Sulfate Reducing Bacteria Using Corn Fermentation Broth as Carbon Source

将玉米发酵液作为微生物硫酸盐还原体系的碳源,可大幅降低还原成本,对实现硫酸盐废水经济、高效处理具有重要意义。探究了复合碳源比例、碳硫比(C S)和pH等对硫酸盐还原菌(SRB)还原硫酸盐的影响。结果表明:在初始SO_(4)^(2-)浓度为(1000±50)mg L时,5种复合碳源比例均能获得较好的硫酸盐还原效果,剩余SO_(4)^(2-)浓度均小于地下水质量标准Ⅳ类水质350 mg L要求;当初始C S=0~3.5时,随C S比升高,SRB的硫酸盐还原速率增加,但碳源的硫酸盐还原利用效率下降;在初始pH接近7.0时SRB硫酸盐还原活性最佳。反应体系pH和ORP值的变化可准确指示细菌活性变化。

Using corn fermentation broth as the carbon source for microbial sulfate reduction system can significantly reduce the cost of reduction,which is of great significance in realizing the economic and efficient treatment of sulfate wastewater.The effects of ratio of composite carbon source,ratio of carbon to sulfur(CODcr SO_(4)^(2-),C S)and pH value on the reduction of sulfate by sulfate reducing bacteria(SRB)were investigated.The results show that when the initial concentration of SO_(4)^(2-)is(1000±50)mg L,the five composite carbon source ratios are able to obtain better sulfate reduction effect,and the residual concentration of SO_(4)^(2-)is less than that of the groundwater quality standard ClassⅣwater quality of 350 mg L.When the initial C S ratio is in the range of 0—3.5,with the increase of the C S ratio,the sulfate reduction rate by SRB increases,but the remaining sulfate reduction utilization efficiency of carbon source decreases.The sulfate reducing activity of SRB is the best when the initial pH value is close to 7.0.The changes in pH value and ORP of the reaction system can accurately indicate changes in bacterial activity.