TY - GEN
T1 - Simultaneous electricity production and arsenic mitigation in paddy soils by using microbial fuel cells
AU - Chen, Z.
AU - Gustave, W.
AU - Yuan, Z. F.
AU - Sekar, R.
AU - Chang, H. C.
AU - Salaun, P.
AU - Zhang, J. Y.
N1 - Publisher Copyright:
© 2018, CRC Press/Balkema. All rights reserved.
PY - 2018
Y1 - 2018
N2 - Arsenic behavior in paddy soils is known to couple with the redox process of iron (Fe) minerals. When soil is flooded, Fe oxides are transformed to soluble ferrous ions by accepting the electrons from Fe reducers. In this study, we tried to manipulate the Fe redox processes in paddy soils by deploying sediment microbial full cells (sMFC). The results showed that the sMFC bioanode can modulate soil porewater Fe and arsenic (As) concentrations. At the end of the experiment, Fe and As contents around sMFC anode were 65.0% and 47.0% of the control respectively. A similar trend was observed in the sMFC bulk soil, where the Fe and As contents were 67.0% and 89.0% of the control respectively. This decrease in Fe and As concentrations could be attributed to the enhanced organic matter (OM) removal by sMFC. In the vicinity of bioanode, OM removal efficiencies were 10.3% and 14.0% higher than the control for lost on ignition carbon and organic carbon respectively. Furthermore, sequencing of the 16S rRNA genes suggested that the change in microbial community structure was minimal. Moreover, during the experiment a maximum current and power density of 0.31 mA and 12.0 mWm−2 were obtained, respectively. This study shows a novel way to make good use of As contaminated paddy soils, which is to simultaneously generate electricity and reduce the As mobility.
AB - Arsenic behavior in paddy soils is known to couple with the redox process of iron (Fe) minerals. When soil is flooded, Fe oxides are transformed to soluble ferrous ions by accepting the electrons from Fe reducers. In this study, we tried to manipulate the Fe redox processes in paddy soils by deploying sediment microbial full cells (sMFC). The results showed that the sMFC bioanode can modulate soil porewater Fe and arsenic (As) concentrations. At the end of the experiment, Fe and As contents around sMFC anode were 65.0% and 47.0% of the control respectively. A similar trend was observed in the sMFC bulk soil, where the Fe and As contents were 67.0% and 89.0% of the control respectively. This decrease in Fe and As concentrations could be attributed to the enhanced organic matter (OM) removal by sMFC. In the vicinity of bioanode, OM removal efficiencies were 10.3% and 14.0% higher than the control for lost on ignition carbon and organic carbon respectively. Furthermore, sequencing of the 16S rRNA genes suggested that the change in microbial community structure was minimal. Moreover, during the experiment a maximum current and power density of 0.31 mA and 12.0 mWm−2 were obtained, respectively. This study shows a novel way to make good use of As contaminated paddy soils, which is to simultaneously generate electricity and reduce the As mobility.
UR - http://www.scopus.com/inward/record.url?scp=85079223960&partnerID=8YFLogxK
U2 - 10.1201/9781351046633-195
DO - 10.1201/9781351046633-195
M3 - Conference Proceeding
AN - SCOPUS:85079223960
SN - 9781138486096
T3 - Environmental Arsenic in a ChangingWorld - 7th International Congress and Exhibition Arsenic in the Environment, 2018
SP - 496
EP - 497
BT - Environmental Arsenic in a ChangingWorld - 7th International Congress and Exhibition Arsenic in the Environment, 2018
A2 - Zhu, Yong-Guan
A2 - Zhu, Yong-Guan
A2 - Guo, Huaming
A2 - Guo, Huaming
A2 - Bhattacharya, Prosun
A2 - Bhattacharya, Prosun
A2 - Bundschuh, Jochen
A2 - Ahmad, Arslan
A2 - Ahmad, Arslan
A2 - Ahmad, Arslan
A2 - Naidu, Ravi
A2 - Naidu, Ravi
PB - CRC Press/Balkema
T2 - 7th International Congress and Exhibition Arsenic in the Environment, 2018
Y2 - 1 July 2018 through 6 July 2018
ER -