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The Mexican Cactus as a New Environmentally Benign Material for the Removal of Contaminants in Drinking Water

Published online by Cambridge University Press:  01 February 2011

Kevin Andrew Young ,
Alessandro Anzalone ,
Thomas Pichler ,
Michel Picquart  and
Norma A. Alcantar
Kevin Andrew Young
Affiliation:
kayoung@eng.usf.edu, University of South Florida, Chemical Engineering, 4202 E. Fowler Ave. ENB 118, Tampa, FL, 33620, United States, 813-396-9305
Alessandro Anzalone
Affiliation:
anzalone@eng.usf.edu, University of South Florida, Chemical Engineering, 4202 E. Fowler Ave. ENB 118, Tampa, FL, 33620, United States
Thomas Pichler
Affiliation:
pichler@shell.cas.usf.edu, University of South Florida, Department of Geology, Tampa, Fl, 33620, United States
Michel Picquart
Affiliation:
mp@xanum.uam.mx, Universidad Autonoma Metropolitana, Departamento de Fisica, Mexico, D.F., N/A, 09340, Mexico
Norma A. Alcantar
Affiliation:
alcantar@eng.usf.edu, University of South Florida, Chemical Engineering, 4202 E. Fowler Ave. ENB 118, Tampa, FL, 33620, United States
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Abstract

The use of natural environmentally benign agents in the treatment of drinking water is rapidly gaining interest due to their inherently renewable character and low toxicity. We show that the common Mexican cactus produces a gum-like substance, cactus mucilage, which shows excellent flocculating abilities and is an economically viable alternative for low-income communities. Cactus mucilage is a neutral mixture of approximately 55 high-molecular weight sugar residues composed basically of arabinose, galactose, rhamnose, xylose, and galacturonic acid. We show how this natural product was characterized for its use as a flocculating agent. Our results show the mucilage efficiency for reducing arsenic and particulates from drinking water as determined by light scattering, Atomic Absorption and Hydride Generation-Atomic Fluorescence Spectroscopy. Flocculation studies proved the mucilage to be a much faster flocculating agent when compared to Al2(SO4)3 with the efficiency increasing with mucilage concentration. Jar tests revealed that lower concentrations of mucilage provided the optimal effectiveness for supernatant clarity, an important factor in determining the potability of water. Initial filter results with the mucilage embedded in a silica matrix prove the feasibility of applying this technology as a method for heavy metal removal. This project provides fundamental, quantitative insights into the necessary and minimum requirements for natural flocculating agents that are innovative, environmentally benign, and cost-effective.

Keywords

Aschemical compositionbiological
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 930: Symposium JJ – Materials Science of Water Purification , 2006 , 0930-JJ01-01
Copyright
Copyright © Materials Research Society 2006

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