生物转化
砷
环境化学
酸性矿井排水
生物矿化
尾矿
生物修复
环境修复
化学
细菌
生物
生态学
生物化学
污染
酶
物理化学
古生物学
有机化学
遗传学
作者
Chi-Yu Chen,Guobao Wang,Mengyao Li,Chen Xiaoting,Daijie Chen,Zekai Feng,Yuanyuan Jiang,Hang Yu,Yuanqing Chao,Yetao Tang,Rongliang Qiu,Shizhong Wang
标识
DOI:10.1016/j.scitotenv.2023.164230
摘要
Biological aqua crust (BAC), as a novel biological crust with high arsenic (As) immobilization capacity, might be an ideal nature-based solution for As removal in mine drainage. This study examined the As speciation, binding fraction and biotransformation genes in the BACs to find out the underlying mechanism of As immobilization and biotransformation. Results showed that the BACs could immobilize As from mine drainage up to 55.8 g/kg, and their As immobilization concentrations were 1.3-6.9 times higher than that of sediments. Extremely high As immobilization capacity was attributed to the processes of bioadsorption/absorption and biomineralization driven by Cyanobacteria. The high abundance of As(III) oxidation genes (27.0 %) enhanced microbial As(III) oxidation, resulting in >90.0 % of As(V) with low toxicity and mobility in the BACs. The increase in abundances of aioB, arsP, acr3, arsB, arsC and arsI with As was the key process for microbiota in the BACs for resistance to the As toxicity. In conclusion, our findings innovatively confirmed the potential mechanism of As immobilization and biotransformation mediated by the microbiota in the BACs and highlighted the important role of BACs for As remediation in mine drainage.
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