HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Figures Only Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Related articles in JEQ Similar articles in this journal Similar articles in ISI Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via ISI Web of Science (14) Citing Articles via Google Scholar Google Scholar Articles by Osuna, M. B. Articles by Lens, P. N. L. Search for Related Content PubMed PubMed Citation Articles by Osuna, M. B. Articles by Lens, P. N. L. Agricola Articles by Osuna, M. B. Articles by Lens, P. N. L. Related Collections Heavy Metals Water Pollution

TECHNICAL REPORTS

Heavy Metals in the Environment

Effect of Cobalt Sorption on Metal Fractionation in Anaerobic Granular Sludge

^a Sub-Department of Environmental Technology, University of Wageningen, NL-6700-EV Wageningen, the Netherlands
^b Chemical and Environmental Engineering Department, School of Engineering, University of Basque Country, E-48013 Bilbao, Spain

^* Corresponding author (piet.lens{at}wur.nl).

Received for publication February 24, 2003. A sequential extraction procedure was applied to two anaerobic methanogenic sludges (Eerbeek and Nedalco) to examine the speciation of micro- and macronutrients in the sludges after cobalt sorption by exposing the sludge to a 1 mM Co solution for 4 d at pH 7 and 30°C. The effect of different physicochemical conditions on cobalt sorption was studied as well: effect of pH (6–8), effect of competition by a second trace element (Ni or Fe), modification of the granular matrix by glutaraldehyde or heat treatment, and EDTA (ethylenediaminetetraacetic acid) addition. Sorbed Co was found to distribute between the carbonates, organic matter + sulfides, and residual fractions. Cobalt adsorption resulted in an antagonistic interaction with other metals present in the granular matrix, evidenced by the solubilization of other trace elements (e.g., Ni, Cu, and Zn) as well as macronutrients (especially Ca and Fe). Modification of the sludge matrix by glutaraldehyde or heat treatment, or exposure to EDTA, led to serious modifications of the Co sorption capacity and strong interactions with multivalent cations (i.e., Ca²⁺ and Fe²⁺).

Abbreviations: TS, total solids • UASB, upflow anaerobic sludge bed

Related articles in JEQ:

This Issue in Journal of Environmental Quality

JEQ 2004 33: 1177-1182. [Full Text]