Nitrification/denitrification shaped the mercury-oxidizing microbial community for simultaneous Hg0 and NO removal

被引：68

作者：

Huang, Zhenshan ^{[1
]}

Wei, Zaishan ^{[1
]}

Xiao, Xiaoliang ^{[1
]}

Tang, Meiru ^{[1
]}

Li, Bolong ^{[1
]}

Zhang, Xiao ^{[1
]}

机构：

[1] Sun Yat Sen Univ, Sch Environm Sci & Engn, Guangdong Prov Key Lab Environm Pollut Control &, Guangzhou 510275, Guangdong, Peoples R China

来源：

BIORESOURCE TECHNOLOGY | 2019年 / 274卷

基金：

中国国家自然科学基金;

关键词：

Hg-0; bio-oxidation; Nitrification/denitrification; Membrane biofilm reactor; Microbial community; Mechanism; NITRIC-OXIDE REMOVAL; MEMBRANE BIOREACTOR; NITROGEN-OXIDES; WASTE-WATER; FLUE-GAS; DENITRIFICATION; PERFORMANCE; NITRIFICATION; RESISTANCE; OXIDATION;

D O I：

10.1016/j.biortech.2018.11.069

中图分类号：

S2 [农业工程];

学科分类号：

0828 ;

摘要：

A denitrifying/nitrifying membrane biofilm reactor for simultaneous removal of Hg-0 and NO was investigated. Hg-0 and NO removal efficiency attained 94.5% and 86%, respectively. The mercury-oxidizing microbial community was significantly shaped by nitrification/denitrification after the supply of gaseous Hg-0 and NO continuously. Dominant genera Rhodanobacter and Nitrosomonas participated in Hg-0 oxidation, nitrification and denitrification simultaneously. Hg-0 oxidizing bacteria (Gallionella, Rhodanobacter, Ottowia, Nitrosomonas and etc.), nitrifying bacteria (Nitrosomonas, Rhodanobacter, Diaphorobacte and etc.) and denitrifying bacteria (Nitrosomonas, Rhodanobacter, Castellaniella and etc.) co-existed in the MBfR, as shown by metagenomic sequencing. X-ray photoelectron spectroscopy (XPS) and high performance liquid chromatography-inductively coupled plasma mass spectrometry (HPLC-ICP-MS) confirmed the formation of a mercuric species (Hg2+) from mercury bio-oxidation. Mechanism of mercury oxidation can be described as the bacterial oxidation of Hg-0 in which Hg-0 serves as electron donor, NO serves as electron donor in nitrification and electron acceptor in denitrification, oxygen serves as electron acceptor.

引用

页码：18 / 24

页数：7

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