Kinetics of Arsenic Contaminated Soils Remediation with Arthrobacter nicotiniae and Klebsiella pneumoniae

Eguakhide Atikpo, Blessing E Eboibi


This work is on bioremediation of soils contaminated with arsenic (As) using Arthrobacter nicotiniae (A. nicotiniae) and Klebsiella pneumoniae (K. pneumoniae) with a special focus on the kinetics of the bioremediation. The organisms were indigenous to the treated soils. They were respectively inoculated into 5 g each of soils samples dressed to attain a condition preset with optimum influencers earlier screened from first phase of remediation study. The samples were studied on 7, 14, 21, 28 and 35 days for residual As, and the laboratory results were assessed with four kinetics models.  The tested models well described the bioremediation process. However, bioremediation with A. nicotiniae was overwhelmed by chemical process and the bioremediation with K. pneumoniae was taken charge of by physical process as determined from the rate-limiting steps of chemisorption and diffusion for the influences of A. nicotiniae and K. pneumoniae respectively. This is vital for the design and operation of an effective treatment system.

Keywords - Kinetics, soils, bioremediation, systems

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