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 language | English |
|---|---|
| Title of host publication | Environmental Arsenic in a ChangingWorld - 7th International Congress and Exhibition Arsenic in the Environment, 2018 |
| Editors | Yong-Guan Zhu, Huaming Guo, Prosun Bhattacharya, Jochen Bundschuh, Arslan Ahmad, Ravi Naidu |
| Publisher | CRC Press/Balkema |
| Pages | 506-507 |
| Number of pages | 2 |
| ISBN (Print) | 9781138486096 |
| Publication status | Published - Jul 2018 |
| Event | 7th International Congress and Exhibition Arsenic in the Environment, 2018 - Beijing, China Duration: 1 Jul 2018 → 6 Jul 2018 |
Conference
| Conference | 7th International Congress and Exhibition Arsenic in the Environment, 2018 |
|---|---|
| Country/Territory | China |
| City | Beijing |
| Period | 1/07/18 → 6/07/18 |
Funding
CMvG acknowledges funding support by a NWO Veni grant (Project No. 14400).