Simultaneous mercury oxidation and NO reduction in a membrane biofilm reactor
Simultaneous mercury oxidation and NO reduction in a membrane biofilm reactor
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在膜生物膜反应器中同时进行汞氧化和 NO 还原
DOI：
10.1016/j.scitotenv.2018.12.105
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发表时间：
2019
影响因子：
9.8
通讯作者：
Zhang X
中科院分区：
文献类型：
--
作者：
Huang Z S;Wei Z S;Xiao X L;Tang M R;Li B L;Zhang X
This work demonstrates bacterial oxidation of mercury (Hg0) coupled to nitric oxide (NO) reduction in a denitrifying membrane biofilm reactor (MBfR). In 93 days' operation, Hg0and NO removal efficiency attained 90.7% and 74.1%, respectively.Thauera,Pseudomonas,ParacoccusandPannonibacterplayed dual roles as Hg0oxidizers and denitrifiers simultaneously. Denitrifying bacteria and the potential mercury resistant bacteria dominated the bacterial community. Denitrification-related genes (norB,norC,norD,norE,norQandnorV) and enzymatic Hg0oxidation-related genes (katG,katE) were responsible for bacterial oxidation of Hg0and NO reduction, as shown by metagenomic sequencing. XPS, HPLC-ICP-MS and SEM-EDS indicated the formation of a stable mercuric species (Hg2+) reasulting from Hg0oxidation in the biofilm. Bacterial oxidation of Hg0was coupled to NO reduction in which Hg0served as the initial electron donor while NO served as the terminal electron acceptor and thereby redox between Hg0and NO was formed. MBfR was capable of both Hg0bio-oxidation and denitrifying NO reduction. This research opens up new possibilities for application of MBfR to simultaneous flue gas demercuration and denitration.
