Electrocoagulation for Arsenic Removal: Field Trials in Rural West Bengal.
Journal
Archives of environmental contamination and toxicology
ISSN: 1432-0703
Titre abrégé: Arch Environ Contam Toxicol
Pays: United States
ID NLM: 0357245
Informations de publication
Date de publication:
Jan 2021
Jan 2021
Historique:
received:
30
06
2020
accepted:
04
12
2020
pubmed:
6
1
2021
medline:
26
1
2021
entrez:
5
1
2021
Statut:
ppublish
Résumé
Arsenic contamination in drinking water is a great concern in different regions of the world as well as in India. Several technologies have been investigated to remove arsenic from water, such as coagulation and co-precipitation, ion exchange, adsorption, and reverse osmosis. In the present research, electrocoagulation with iron electrodes has been assessed as a treatment technology for arsenic removal from groundwater to reach concentrations below 0.01 mg/L (WHO limit) and which is technically effective, affordable for the local area, and easy to operate and maintain. Electrochemically generated iron is converted to hydrated ferric oxide within the contaminated water, which takes up the arsenic from water. A downstream filtration unit (sand or activated alumina) is applied to remove ferric hydroxide flocs produced during the process. The laboratory experiments were conducted in a batch reactor using iron plates as electrodes with monopolar configuration to study the effects of initial pH and electro-charge loading (ECL) on arsenic removal. The optimum operating condition was observed for an electro-charge loading of 25-30 Coulombs/L at pH 7.0 and an initial arsenic concentration of 0.2 mg/L. Two field trials were implemented in West Bengal after suitably designing the electrocoagulation system. Arsenic removal was significant (75-80%) delivering safe water with arsenic below 0.01 mg/L (acceptable limit). Passivation of the electrodes occurred during the operation and calcium-based (including iron) deposition was observed on the cathodes. Passivation is avoidable after running regular polarity reversal of the electrodes.
Identifiants
pubmed: 33398394
doi: 10.1007/s00244-020-00799-8
pii: 10.1007/s00244-020-00799-8
doi:
Substances chimiques
Ferric Compounds
0
Minerals
0
Water Pollutants, Chemical
0
ferric oxide
1K09F3G675
ferric hydroxide
2UA751211N
Iron
E1UOL152H7
Arsenic
N712M78A8G
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
248-258Références
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