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| Mechanism of two representative carbonaceous materials impact on microbial reduction of arsenic-bearing ferrihydrite |
| Received:March 30, 2018 |
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| KeyWord:microbial extracellular electron transfer;activated carbon;biochar;iron reduction;arsenic;vivanite |
| Author Name | Affiliation | E-mail | | WU Song | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | YUAN Bei-jia | Nanjing Foreign Language School, Nanjing 210008, China | | | YAN Hui-jun | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | FANG Guo-dong | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | ZHANG Jun | Nanjing Foreign Language School, Nanjing 210008, China | | | WANG Yu-jun | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
University of Chinese Academy of Sciences, Beijing 100049, China | yjwang@issas.ac.cn | | ZHOU Dong-mei | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | dmzhou@issas.ac.cn |
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| Abstract: |
| The effect of activated carbon and biochar on microbial reduction of arsenic-bearing ferrihydrite was studied. The results indicated that activated carbon and biochar inhibited microbial reduction of arsenic-bearing ferrihydrite[As(Ⅴ)-FH] at the initial stage, which was ascribed to the microbial cell toxicity of activated carbon and biochar and supported by the fluorescence staining analysis at 48 h. With the prolonging of incubation time, the microbial cell adapted to the culture environment at 120 h, and reduced Fe(Ⅲ) in As(Ⅴ)-FH efficiently. With further increase of incubation time to 246 h, activated carbon and biochar greatly promoted the extent of Fe(Ⅲ) reduction in As(Ⅴ)-FH. Moreover, the removal of As from the supernatant was inhibited by the addition of activated carbon and biochar. The secondary minerals vivianite and siderite were formed in sequence during microbial reduction of As(Ⅴ)-FH, and As was mainly immobilized by vivianite. The study provides a new insight into the mechanism of the effect of carbonaceous materials on the transformation and release of As from As-bearing mineals mediated by microbe in the naturally occurring environment. |
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