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 article in proceedingspeer-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 Changing World
Subtitle of host publicationProceedings of the 7th International Congress and Exhibition on Arsenic in the Environment (AS 2018), July 1-6, 2018, Beijing, P.R. China
EditorsYong-Guan Zhu, Huaming Guo, Prosun Bhattacharya, Jochen Bundschuh, Arslan Ahmad, Ravi Naidu
PublisherTaylor & Francis Group
Pages506-507
Number of pages2
ISBN (Print)978-113848609-6
DOIs
Publication statusPublished - 2018
Externally publishedYes
Event7th International Congress and Exhibition Arsenic in the Environment, 2018 - Beijing, China
Duration: 1 Jul 20186 Jul 2018
Conference number: 7

Conference

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

Programme Area

  • Programme Area 2: Water Resources

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