Title: Mechanism and kinetics of Zn(II) removal from wastewater by immobilised beads of SRB sludge

Authors: Liyuan Chai, Xiaobo Min, Ning Tang, Yunyan Wang

Addresses: 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 Metallurgical Science and Engineering, Central South University, Changsha 410083, PR China. ' School of Metallurgical Science and Engineering, Central South University, Changsha 410083, PR China

Abstract: The treatment of Zn(II)-bearing wastewater by immobilised Sulfate Reducing Bacteria (SRB) sludge beads of inner cohesive nutrient source was investigated, by which the traditional problems in SRB methods were resolved. The mechanism and kinetics model on Zn(II) removal were studied. The results showed that SO₄²⁻ was reduced to S²⁻ on the surface of SRB sludge beads, and Zn(II) precipitated outside beads. The effect of internal diffusion could be neglected, and the chemical reaction was the rate determining step. The reaction kinetics was followed by Micaelis-Menten formula, and the constants, K_s and v_max were 8.99 mg⋅L⁻¹ and 0.018 mg⋅L⁻¹⋅s⁻¹, respectively.

Keywords: inner cohesive nutrients; immobilised SRB sludge beads; Zn(II)-bearing wastewater; mechanisms; reaction kinetics; zinc; wastewater treatment; sulfate reducing bacteria; environmental biotechnology.

DOI: 10.1504/IJEP.2009.024468

International Journal of Environment and Pollution, 2009 Vol.37 No.1, pp.20 - 33

Published online: 06 Apr 2009 *

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