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Title: Arsenic removal from drinking water during coagulation

Abstract

The efficiency of arsenic removal from source waters and artificial freshwaters during coagulation with ferric chloride and alum was examined in bench-scale studies. Arsenic(V) removal by either ferric chloride or alum was relatively insensitive to variations in source water composition below pH 8. At pH 8 and 9, the efficiency of arsenic(V) removal by ferric chloride was decreased in the presence of natural organic matter. The pH range for arsenic(V) removal with alum was more restricted than with ferric chloride. For source waters spiked with 20 {micro}g/L arsenic(V), final dissolved arsenic(V) concentrations in the product water of less than 2 {micro}g/L were achieved with both coagulants at neutral pH. Removal of arsenic(III) from source waters by ferric chloride was both less efficient and more strongly influenced by source water composition than removal of arsenic(V). The presence of sulfate (at pH 4 and 5) and natural organic matter (at pH 4 through 9) adversely affected the efficiency of arsenic(III) removal by ferric chloride. Arsenic(III) could not be removed from source waters by coagulation with alum.

Authors:
 [1];  [2]; ;  [3]
  1. California Inst. of Tech., Pasadena, CA (United States)
  2. Industrial Technology Research Inst., Chutung Hsinchu (Taiwan, Province of China)
  3. Univ. of California, Los Angeles, CA (United States). Dept. of Civil and Environmental Engineering
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
538173
Resource Type:
Journal Article
Journal Name:
Journal of Environmental Engineering
Additional Journal Information:
Journal Volume: 123; Journal Issue: 8; Other Information: PBD: Aug 1997
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; ARSENIC; DRINKING WATER; REMEDIAL ACTION; WATER POLLUTION; FLOCCULATION; IRON CHLORIDES; FRESH WATER

Citation Formats

Hering, J G, Chen, P Y, Wilkie, J A, and Elimelech, M. Arsenic removal from drinking water during coagulation. United States: N. p., 1997. Web. doi:10.1061/(ASCE)0733-9372(1997)123:8(800).
Hering, J G, Chen, P Y, Wilkie, J A, & Elimelech, M. Arsenic removal from drinking water during coagulation. United States. https://doi.org/10.1061/(ASCE)0733-9372(1997)123:8(800)
Hering, J G, Chen, P Y, Wilkie, J A, and Elimelech, M. 1997. "Arsenic removal from drinking water during coagulation". United States. https://doi.org/10.1061/(ASCE)0733-9372(1997)123:8(800).
@article{osti_538173,
title = {Arsenic removal from drinking water during coagulation},
author = {Hering, J G and Chen, P Y and Wilkie, J A and Elimelech, M},
abstractNote = {The efficiency of arsenic removal from source waters and artificial freshwaters during coagulation with ferric chloride and alum was examined in bench-scale studies. Arsenic(V) removal by either ferric chloride or alum was relatively insensitive to variations in source water composition below pH 8. At pH 8 and 9, the efficiency of arsenic(V) removal by ferric chloride was decreased in the presence of natural organic matter. The pH range for arsenic(V) removal with alum was more restricted than with ferric chloride. For source waters spiked with 20 {micro}g/L arsenic(V), final dissolved arsenic(V) concentrations in the product water of less than 2 {micro}g/L were achieved with both coagulants at neutral pH. Removal of arsenic(III) from source waters by ferric chloride was both less efficient and more strongly influenced by source water composition than removal of arsenic(V). The presence of sulfate (at pH 4 and 5) and natural organic matter (at pH 4 through 9) adversely affected the efficiency of arsenic(III) removal by ferric chloride. Arsenic(III) could not be removed from source waters by coagulation with alum.},
doi = {10.1061/(ASCE)0733-9372(1997)123:8(800)},
url = {https://www.osti.gov/biblio/538173}, journal = {Journal of Environmental Engineering},
number = 8,
volume = 123,
place = {United States},
year = {Fri Aug 01 00:00:00 EDT 1997},
month = {Fri Aug 01 00:00:00 EDT 1997}
}