Efficient generation of aqueous fe in electrocoagulation systems for low-cost arsenic removal

S. Müller, T. Behrends, C. M. van Genuchten

Publikation: Bidrag til bog/rapport/konferenceproceedingsKonferenceartikel i proceedingspeer review

Abstrakt

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.

OriginalsprogEngelsk
TitelEnvironmental Arsenic in a ChangingWorld - 7th International Congress and Exhibition Arsenic in the Environment, 2018
RedaktørerYong-Guan Zhu, Yong-Guan Zhu, Huaming Guo, Huaming Guo, Prosun Bhattacharya, Prosun Bhattacharya, Jochen Bundschuh, Arslan Ahmad, Arslan Ahmad, Arslan Ahmad, Ravi Naidu, Ravi Naidu
ForlagCRC Press/Balkema
Sider506-507
Antal sider2
ISBN (Trykt)9781138486096
DOI
StatusUdgivet - 2018
Begivenhed7th International Congress and Exhibition Arsenic in the Environment, 2018 - Beijing, Kina
Varighed: 1 jul. 20186 jul. 2018

Publikationsserier

NavnEnvironmental Arsenic in a ChangingWorld - 7th International Congress and Exhibition Arsenic in the Environment, 2018

Konference

Konference7th International Congress and Exhibition Arsenic in the Environment, 2018
Land/OmrådeKina
ByBeijing
Periode1/07/186/07/18

Programområde

  • Programområde 2: Vandressourcer

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