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Microbial reduction and migration of As/Fe mediated by electron shuttle:Differences between incorporated and adsorbed As(V)

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Water Biology and Security 2022年第2期1卷 72-80页

作者： Jia Wang Zuoming Xie Yanxin Wang Yang Yang Mengna Chen School of Environmental Studies China University of GeosciencesWuhan430074PR China State Key Laboratory of Biogeology and Environmental Geology China University of GeosciencesWuhan430074PR China

Metal-reducing bacteria play a central and important role in the biogeochemical cycle of arsenic(As)and iron(Fe).Research on As/Fe migration from arsenic-containing iron minerals mediated by electronic shuttles is of significance to groundwater protection and human ***,the redox activity and bioavailability of goethite with differing occurrence and distribution of arsenic have not been studied *** this study,the function of electron shuttle AQDS in Fe(III)bioreduction was *** was found that acidic conditions were conducive to the growth and reproduction of strain D2201,which was beneficial to the reduction of As(V)/Fe(III).The OD600nm value of the bacteria at pH 6 exceeded twice that at pH ***,three types of goethite,namely pure goethite(Gt),coprecipitated As(V)-goethite(Gt-As),and adsorbed arsenic-goethite(Gt*As),were compared for microbial reduction reactivity.X-ray photoelectron spectroscopy analysis illustrated the proportion of OH-content in Gt-As was much lower than that of Gt and Gt*As,indicating Gt-As carried more surface defects and had higher *** Fe(II)content released from AQDS-mediated bioreduction of Gt-As was two-fold higher than that of Gt and Gt*As at pH *** addition,pH significantly affected goethite bioreduction efficiency and arsenic migration *** dissolved Fe(II)concentration for Gt-As was 0.98,0.133,and 0.139 mM at pH 6,7,and 8,respectively;corresponding to dissolved As(T)content of 3.51,1.48,and 1.31μM within 9 days of *** study highlights the significant influence of AQDS and mineral structure on the As/Fe biochemical cycle,which will help further develop the bioremediation of arsenic-contaminated sediments.

关键词： Indigenous bacteria Goethite AQDS Fe(III)reduction arsenic release

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Disposal of arsenic Filter Sludge in Soil and its Consequences

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Journal of Environmental Science and Engineering 2011年第2期5卷 165-176页

作者： S.M. Imamul Huq L. Nesal, M.T.A. Chowdhury J.C. Joardar Bangladesh-Australia Centre for Environmental Research （BA CER-DU） University of Dhaka Dhaka-1000 Bangladesh Soil Science Discipline Khulna University Khulna Bangladesh

Incubation, macrocosm and field studies were carried out to observe any increase in the concentration of arsenic （As） in soil and its subsequent uptake by plants due to disposal of As-filter sludge into soil from two different arsenic removal media. One of the media was iron based and the other was activated alumina based. For the incubation study, sludge @ 1 ***^-1 and 0.5 *** from the two sources wer applied to soils and incubated for 180 days with five individual incubation periods viz., 15, 30, 60, 90 and 180 days. At the end of each incubation period the soils were extracted with 1M HCI. For the macrocosm study, a leafy vegetable-lpomoea aquatica L. and rice （Oryza sativa L.） were grown in pots treated with sludge @ 1 T·ha^-1 and 0.5 T·ha^-1 soils. For the field study, two leafy vegetables viz., red amaranthus （Amaranthus gangeticus L.） and Kalmi （Ipomoea aquatiea L.） were grown on soils treated with the sludge @ 1 ***^-1 in plots of 1 m^2 sizes. arsenic was found to have increased under upland and lowland conditions that contributed to an increased accumulation of the element in the plants. The increase of As was found to be relatively higher under upland condition than under submerged condition. arsenic accumulation in plants was found to be the highest in the roots followed by straw and grain. Similar observation has been made under field condition too. Increased concentration of Fe an AI has also been observed which could be a new environmental hazard. The study reveals that the filters used for making As-safe drinking water cannot be safely disposed of to the soil, particularly to the agricultural soils.

关键词： Contamination disposal arsenic release upland condition lowland condition.

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