Aluminum-based drinking-water treatment residuals: A novel sorbent for perchlorate removal

Perchlorate contamination of aquifers and drinking-water supplies has led to stringent regulations in several states to reduce perchlorate concentrations in water at acceptable levels for human consumption. Several perchlorate treatment technologies exist, but there is significant cost associated wi...

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Bibliographic Details
Published in:Environmental pollution (1987) 2006-03, Vol.140 (1), p.9-12
Main Authors: Makris, Konstantinos C., Sarkar, Dibyendu, Datta, Rupali
Format: Article
Language:English
Subjects:
adsorbents
Adsorption
Aluminum
aluminum oxide
Applied sciences
Chloride
chlorides
Desorption
drinking water
Drinking water and swimming-pool water. Desalination
Drinking-water treatment residuals
Exact sciences and technology
Humans
Perchlorate
Perchlorates
Pollution
Sodium Compounds
Waste Products
Water Pollutants, Chemical
water pollution
Water Purification - methods
Water Supply
water treatment
Water treatment and pollution
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Summary:Perchlorate contamination of aquifers and drinking-water supplies has led to stringent regulations in several states to reduce perchlorate concentrations in water at acceptable levels for human consumption. Several perchlorate treatment technologies exist, but there is significant cost associated with their use, and the majority of them are unable to degrade perchlorate to innocuous chloride. We propose the use of a novel sorbent for perchlorate, i.e. an aluminum-based drinking-water treatment residual (Al-WTR), which is a by-product of the drinking-water treatment process. Perchlorate sorption isotherms (23 ± 1 °C) showed that the greatest amount (65%) of perchlorate removed by the Al-WTR was observed with the lowest initial perchlorate load (10 mg L −1) after only 2 h of contact time. Increasing the contact time to 24 h, perchlorate removal increased from 65 to 76%. A significant correlation was observed between the amounts of perchlorate removed with evolved chloride in solution, suggesting degradation of perchlorate to chloride. Drinking-water treatment residuals are a low-cost sorbent for perchlorate.
ISSN:0269-7491
1873-6424
DOI:10.1016/j.envpol.2005.08.075