TY - GEN
T1 - Efficient generation of aqueous fe in electrocoagulation systems for low-cost arsenic removal
AU - Müller, S.
AU - Behrends, T.
AU - van Genuchten, C. M.
N1 - Funding Information:
CMvG acknowledges funding support by a NWO Veni grant (Project No. 14400).
Funding Information:
This work was financially supported by National Council for Science and Technology (CONACYT), within the Program Attention to National Problems.
Publisher Copyright:
© 2018, CRC Press/Balkema. All rights reserved.
PY - 2018
Y1 - 2018
N2 - Iron-electrocoagulation (Fe-EC), the electrochemical generation of Fe adsorbents in situ, is an effective treatment solution for arsenic (As) contaminated water in decentralized areas. However, extended field trials also revealed problems regarding the efficiency over long-term operation. To investigate how Fe generation is affected by repeated operation of Fe-EC systems, we performed laboratory experiments over a range of electrochemical and solution chemical conditions for 15–35 runs in batch mode. Our results show that Fe generation declines continuously during repeated operation under typical field conditions, resulting in a lower Fe dose than expected based on Faraday’s law. In addition, we find that efficient Fe generation can be maintained in electrolytes free of oxyanions or by applying charge dosage rates ≥15 C L−1 min−1. Based on these results, we discuss potential strategies to maintain the efficiency of Fe-EC field systems under realistic conditions.
AB - Iron-electrocoagulation (Fe-EC), the electrochemical generation of Fe adsorbents in situ, is an effective treatment solution for arsenic (As) contaminated water in decentralized areas. However, extended field trials also revealed problems regarding the efficiency over long-term operation. To investigate how Fe generation is affected by repeated operation of Fe-EC systems, we performed laboratory experiments over a range of electrochemical and solution chemical conditions for 15–35 runs in batch mode. Our results show that Fe generation declines continuously during repeated operation under typical field conditions, resulting in a lower Fe dose than expected based on Faraday’s law. In addition, we find that efficient Fe generation can be maintained in electrolytes free of oxyanions or by applying charge dosage rates ≥15 C L−1 min−1. Based on these results, we discuss potential strategies to maintain the efficiency of Fe-EC field systems under realistic conditions.
UR - http://www.scopus.com/inward/record.url?scp=85079224175&partnerID=8YFLogxK
U2 - 10.1201/9781351046633-200
DO - 10.1201/9781351046633-200
M3 - Conference article in proceedings
AN - SCOPUS:85079224175
SN - 9781138486096
T3 - Environmental Arsenic in a ChangingWorld - 7th International Congress and Exhibition Arsenic in the Environment, 2018
SP - 506
EP - 507
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 -