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Hexavalent chromium reduction by acinetobacter haemolyticus isolated from heavy-metal contaminated wastewater

Zainul, Akmar Zakaria and Zakaria, Zainoha and Surifb, Salmijah and Ahmad, Wan Azlina (2007) Hexavalent chromium reduction by acinetobacter haemolyticus isolated from heavy-metal contaminated wastewater. Journal of Hazardous Materials, 146 (1-2). pp. 30-38. ISSN 0882-5696

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Official URL: http://dx.doi.org/10.1016/j.jhazmat.2006.11.052

Abstract

Possible application of a locally isolated environmental isolate, Acinetobacter haemolyticus to remediate Cr(VI) contamination in water system was demonstrated. Cr(VI) reduction by A. haemolyticus seems to favour the lower concentrations (10–30 mg/L). However, incomplete Cr(VI) reduction occurred at 70–100 mg/L Cr(VI). Initial specific reduction rate increased with Cr(VI) concentrations. Cr(VI) reduction was not affected by 1 or 10 mM sodium azide (metabolic inhibitor), 10 mM of PO43-, SO42-, SO32-, NO3- or 30 mg/L of Pb(II), Zn(II), Cd(II) ions. However, heat treatment caused significant dropped in Cr(VI) reduction to less than 20% only. A. haemolyticus cells loses its shape and size after exposure to 10 and 50 mg Cr(VI)/L as revealed from TEM examination. The presence of electron-dense particles in the cytoplasmic region of the bacteria suggested deposition of chromium in the cells.

Item Type:Article
Uncontrolled Keywords:reduction; acinetobacter; CR(VI); TEM; heavy-metal
Subjects:Q Science > QD Chemistry
Divisions:Science
ID Code:8790
Deposited By:INVALID USER
Deposited On:12 May 2009 07:51
Last Modified:12 May 2009 07:57

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