Please use this identifier to cite or link to this item:
Title: Effect of solution chemistry on arsenic sorption by Fe- and Al-based drinking-water treatment residuals
Authors: Nagar, Rachana 
Sarkar, Dibyendu 
Dattad, Rupali K. 
Makris, Konstantinos C. 
Major Field of Science: Natural Sciences
Field Category: Earth and Related Environmental Sciences
Keywords: Arsenic;Sorption;Drinking-water treatment residual (WTR);Water quality;Remediation
Issue Date: Feb-2010
Source: Chemosphere, 2010, Volume 78, Issue 8, Pages 1028–1035
Abstract: Drinking-water treatment residual (WTR) have been proposed as a low-cost alternative sorbent for arsenic (As) – contaminated aquatic and soil systems. However, limited information exists regarding the effect of solution chemistry on As sorption by WTR. A batch incubation study was carried out to investigate the effect of solution pH (3–9) on As(V) sorption by Al- and Fe-based WTR as a function of solid: solution ratio (SSR) and initial As concentration. The effect of competing ligands (phosphate-P(V) and sulfate), and complexing metal (calcium) on As(V) sorption envelopes at the optimum SSR (200 g L−1) was also evaluated. At 200 g L−1 SSR, maximum As(V) sorption (∼100%) exhibited by the Fe-WTR was limited at the pH range of 3–7, whereas, the Al-WTR demonstrated ∼100% As(V) sorption in the entire pH range. The negative pH effect on As(V) sorption became more pronounced with increasing initial As concentrations and decreasing SSR. Sorption of As(V) by surfaces of both WTR decreased in the presence of P(V), exhibiting strong pH dependence. Only for the Fe-WTR, increased dissolved iron concentrations at pH > 7 supported a Fe-hydroxide reductive dissolution mechanism to account for the enhanced As sorption at alkaline pH. Addition of sulfate did not influence As(V) sorption by both WTR. A cooperative effect of calcium on As(V) sorption was observed at alkaline pH due to the formation of a calcium–arsenate phase. The constant capacitance model provided reasonable fits to the sorption envelope data for both single ion and binary ion (As and P) systems, but it was unable to explain the enhanced As sorption by the Fe-WTR at pH > 7.
ISSN: 00456535
Rights: © Elsevier Ltd.
Type: Article
Affiliation : Weiss Associates 
Montclair State University 
Cyprus University of Technology 
Michigan Technological University 
Appears in Collections:Άρθρα/Articles

CORE Recommender
Show full item record


checked on Feb 13, 2018

Page view(s)

Last Week
Last month
checked on May 22, 2024

Google ScholarTM



Items in KTISIS are protected by copyright, with all rights reserved, unless otherwise indicated.