果皮发酵液为碳源的硫酸盐还原性与酸性含铀废水处理效果

Sulfate Reduction with Fruit Peel Fermented Solution and Effect of Desulfidation for Acidic Uranium-laden Sulphate Wastewater

酸法地浸铀矿山退役采区地下水存在pH低、SO_(4)^(2-)和铀浓度高等潜在污染问题。针对这类污染地下水,选用某铀矿尾渣中富集获得的以硫酸盐还原菌(Sulfate-reducing Bacteria,SRB)为优势的混合培养物A_(3m)-21ZLL,开展以苹果皮发酵液为碳源的硫酸盐还原能力影响因素研究,以及在某酸法地浸铀矿山退役采区地下水脱硫中的应用。结果表明,A_(3m)-21ZLL对苹果皮发酵液具有较好的利用性;以苹果皮发酵液为碳源培养A_(3m)-21ZLL的最佳m(COD)/m(SO_(4)^(2-))=7,最佳接种量为10%;酸法地浸退役铀矿地下水中SO_(4)^(2-)、Fe^(2+)和U^(6+)原浓度分别为960.737、47.6、1.095 mg/L,经回流处理后去除率分别达91.8%、97.2%和88.6%,pH由3.98升至5.78,其中SO_(4)^(2-)、Fe^(2+)浓度及pH均达到我国《地下水质量标准GB/T 14848-2017》中Ⅳ类水标准。以果皮发酵液为碳源通过硫酸盐还原菌处理酸法含铀硫酸盐地下水具有可行性,且处理效果良好,极具应用前景。

Potential contamination of low pH,high SO_(4)^(2-)and uranium concentration exists in groundwater after acid in-situ uranium leaching mines decommissioned.For this type of contaminated groundwater,a mixture enrichment,A_(3m)-21ZLL,with dominant of Sulfate-Reducing Bacteria(SRB)which enriched from tailing heap of a uranium mine in southern China,was used to investigate the sulfate reducing capability,main influenced factors and effect of desulfidation to a acidic uranium-laden sulphate groundwater with apple peel fermented products as carbon source.The results show that the mix enrichment A_(3m)-21ZLL is of better utilization for the apple peel fermentation products,the best m(COD)/m(SO_(4)^(2-))value is 7,and the best inoculum amount is 10%.The original concentration of SO_(4)^(2-),Fe^(2+)and U6+in decommissioned uranium groundwater is 960.737,47.6,1.095 mg/L respectively,and the removal rate reaches 91.8%,97.2%and 88.6%,respectively,and pH value rises from 3.98 to 5.78 after desulfidation.Among them,concentration of SO_(4)^(2-)and Fe^(2+),and pH value meet the Chinese Groundwater Quality Criteria GB/T 14848—2017,GradeⅣ.It is feasible to treat uranium-laden sulfate groundwater by sulfate reducing bacteria with peel fermented solution as carbon source,the treatment effect is good,and the application prospect is very promising.