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

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

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

Abstract

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.

Original languageEnglish
Title of host publicationEnvironmental Arsenic in a ChangingWorld - 7th International Congress and Exhibition Arsenic in the Environment, 2018
EditorsYong-Guan Zhu, Huaming Guo, Prosun Bhattacharya, Jochen Bundschuh, Arslan Ahmad, Ravi Naidu
PublisherCRC Press/Balkema
Pages506-507
Number of pages2
ISBN (Print)9781138486096
Publication statusPublished - Jul 2018
Event7th International Congress and Exhibition Arsenic in the Environment, 2018 - Beijing, China
Duration: 1 Jul 20186 Jul 2018

Conference

Conference7th International Congress and Exhibition Arsenic in the Environment, 2018
Country/TerritoryChina
CityBeijing
Period1/07/186/07/18

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