Journal
JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING
Volume 49, Issue 6, Pages 671-678Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/10934529.2014.865449
Keywords
in situ treatment; groundwater; phosphate; Arsenic
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Funding
- Natural Sciences and Engineering Research Council (NSERC)
- Ontario Graduate Scholarship program
- Ontario Research Foundation
- Canada Research Chair program
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Contamination of groundwater by arsenic is a problem in many areas of the world, particularly in West Bengal (India) and Bangladesh, where reducing conditions in groundwater are the cause. In situ treatment is a novel approach wherein, by introduction of dissolved oxygen (DO), advantages over other treatment methods can be achieved through simplicity, not using chemicals, and not requiring disposal of arsenic-rich wastes. A lab-scale test of in situ treatment by air sparging, using a solution with approximately 5.3mg L-1 ferrous iron and 200 mu g L-1 arsenate, showed removal of arsenate in the range of 59%. A significant obstacle exists, however, due to the interference of phosphate since phosphate competes for adsorption sites on oxidized iron precipitates. A lab-scale test including 0.5mg L-1 phosphate showed negligible removal of arsenate. In situ treatment by air sparging demonstrates considerable promise for removal of arsenic from groundwater where iron is present in considerable quantities and phosphates are low.
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