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

Zainul Akmar Zakaria, Zainoha Zakaria, Salmijah Surif, Wan Azlina Ahmad

    Research output: Contribution to journalArticle

    109 Citations (Scopus)

    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.

    Original languageEnglish
    Pages (from-to)30-38
    Number of pages9
    JournalJournal of Hazardous Materials
    Volume146
    Issue number1-2
    DOIs
    Publication statusPublished - 19 Jul 2007

    Fingerprint

    Acinetobacter
    Waste Water
    Heavy Metals
    Heavy metals
    chromium
    Chromium
    Wastewater
    heavy metal
    wastewater
    transmission electron microscopy
    inhibitor
    Bacteria
    Contamination
    Sodium Azide
    Heat treatment
    Sodium
    sodium
    chromium hexavalent ion
    Transmission electron microscopy
    electron

    Keywords

    • Acinetobacter
    • Cr(VI)
    • Heavy-metal
    • Reduction
    • TEM

    ASJC Scopus subject areas

    • Chemical Health and Safety
    • Process Chemistry and Technology
    • Safety, Risk, Reliability and Quality
    • Environmental Engineering

    Cite this

    Hexavalent chromium reduction by Acinetobacter haemolyticus isolated from heavy-metal contaminated wastewater. / Zakaria, Zainul Akmar; Zakaria, Zainoha; Surif, Salmijah; Ahmad, Wan Azlina.

    In: Journal of Hazardous Materials, Vol. 146, No. 1-2, 19.07.2007, p. 30-38.

    Research output: Contribution to journalArticle

    Zakaria, Zainul Akmar ; Zakaria, Zainoha ; Surif, Salmijah ; Ahmad, Wan Azlina. / Hexavalent chromium reduction by Acinetobacter haemolyticus isolated from heavy-metal contaminated wastewater. In: Journal of Hazardous Materials. 2007 ; Vol. 146, No. 1-2. pp. 30-38.
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