Title: Transportation and distribution of chromium in the anaerobic sludge treating the chromium-containing wastewater

Authors: Jing Yang, Liyuan Chai, Yunyan Wang, Xuwen He

Addresses: School of Chemical and Environmental Engineering, China University of Mining and Technology, Beijing 100083, PR China. ' School of Metallurgical Science and Engineering, Central South University, Changsha 410083, PR China. ' School of Metallurgical Science and Engineering, Central South University, Changsha 410083, PR China. ' School of Chemical and Environmental Engineering, China University of Mining and Technology, Beijing 100083, PR China

Abstract: The chromium distribution and transportation in the anaerobic activated sludge was investigated using a sequential extraction method. The results showed that Cr(VI) in aqueous solution was reduced by the metabolic product of SRB and form indissoluble Cr(OH)₃ in a solid phase. More than 99% of Cr(III) in the sludge was in a stable residual form (RES) of bio-reduction. The Cr(VI) was mainly present in RES and organic form (OR). With increasing Cr(VI) concentration, Cr(VI) was transferred from RES into OR and even exchangeable form (EXCH). Meanwhile, sulphate and co-existing metal ions affected the occurrence form of Cr(VI).

Keywords: transportation; distribution; anaerobic sludge; hexavalent chromium; wastewater treatment; sequential extraction method.

DOI: 10.1504/IJEP.2009.027226

International Journal of Environment and Pollution, 2009 Vol.38 No.3, pp.256 - 266

Published online: 18 Jul 2009 *

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