Mitigation of methylmercury production in eutrophic waters by interfacial oxygen nanobubbles

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	Mitigation of methylmercury production in eutrophic waters by interfacial oxygen nanobubbles
	Ji, Xiaonan; Liu, Chengbin; Zhang, Meiyi; Yin, Yongguang; Pan, Gang
刊名	WATER RESEARCH
	2020-04-15
卷号	173 页码:1-8
关键词	Mercury methylation Algal bloom Sediment-water interface Anoxia remediation Mercury microbial methylator Mercury bioavailability
ISSN号	0043-1354
英文摘要	In mercury (Hg)-polluted eutrophic waters, algal blooms are likely to aggravate methylmercury (MeHg) production by causing intensified hypoxia and enriching organic matter at the sediment-water interface. The technology of interfacial oxygen (O-2) nanobubbles is proven to alleviate hypoxia and may have potential to mitigate the risks of MeHg formation. In this study, incubation column experiments were performed using sediment and overlying water samples collected from the Baihua Reservoir (China), which is currently suffering from co-contamination of Hg and eutrophication. The results indicated that after the application of O-2 nanobubbles, the %MeHg (ratio of MeHg to total Hg) in the overlying water and surface sediment decreased by up to 76% and 56% respectively. In addition, the MeHg concentrations decreased from 0.54 +/- 0.15 to 0.17 +/- 0.01 ng L-1 in the overlying water and from 56.61 +/- 9.23 to 25.48 +/- 4.08 ng g(-1) in the surface sediment. The decline could be attributed to the alleviation of anoxia and the decrease of labile organic matter and bioavailable Hg. In addition, hgcA gene abundances in the overlying water and surface sediment decreased by up to 69% and 44% after the addition of O-2 nanobubbles, as is consistent with MeHg occurrence in such areas. Accordingly, this work proposed a promising strategy of using interfacial oxygen nanobubbles to alleviate the potentially enhanced MeHg production during algal bloom outbreaks in Hg-polluted eutrophic waters. (c) 2020 Elsevier Ltd. All rights reserved.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/44964]
专题	生态环境研究中心_环境水质学国家重点实验室
推荐引用方式 GB/T 7714	Ji, Xiaonan,Liu, Chengbin,Zhang, Meiyi,et al. Mitigation of methylmercury production in eutrophic waters by interfacial oxygen nanobubbles[J]. WATER RESEARCH,2020,173:1-8.
APA	Ji, Xiaonan,Liu, Chengbin,Zhang, Meiyi,Yin, Yongguang,&Pan, Gang.(2020).Mitigation of methylmercury production in eutrophic waters by interfacial oxygen nanobubbles.WATER RESEARCH,173,1-8.
MLA	Ji, Xiaonan,et al."Mitigation of methylmercury production in eutrophic waters by interfacial oxygen nanobubbles".WATER RESEARCH 173(2020):1-8.