KINETIC STUDY OF BIOSORPTION OF ARSENIC FROM SOIL USING MICROORGANISMS

Authors

  • E Atikpo DEPARTMENT OF CIVIL ENGINEERING, FACULTY OF ENGINEERING, DELTA STATE UNIVERSITY, OLEH CAMPUS, PMB 1, ABRAKA, DELTA STATE, NIGERIA.
  • JE Agori DEPARTMENT OF CIVIL ENGINEERING, FACULTY OF ENGINEERING, DELTA STATE UNIVERSITY, OLEH CAMPUS, PMB 1, ABRAKA, DELTA STATE, NIGERIA.
  • MT Peretomode DEPARTMENT OF CHEMICAL ENGINEERING, FACULTY OF ENGINEERING, DELTA STATE UNIVERSITY, OLEH CAMPUS, PMB 1, ABRAKA, DELTA STATE, NIGERIA.
  • A Michael DEPARTMENT OF ENVIRONMENTAL TECHNOLOGY, FACULTY OF ENVIRONMENTAL SCIENCES, FEDERAL UNIVERSITY OF TECHNOLOGY, OWERRI, PMB 1526, IMO STATE.
  • EC Ofonedu DEPARTMENT OF ENVIRONMENTAL SCIENCE AND RESOURCE MANAGEMENT, FACULTY OF SCIENCE, NATIONAL OPEN UNIVERSITY OF NIGERIA, UNIVERSITY VILLAGE, PLOT 91, CADESTRAL ZONE, NNAMDI AZIKIWE WAY, JABI, ABUJA, NIGERIA. (BENIN STUDY CENTER)

Keywords:

Arsenic, contaminated soils, biosorption, sorption kinetics, microorganisms.

Abstract

This work studied the kinetics of biosorption of arsenic (As) from polluted soils using two bacteria [Proteus mirabilis (P. mirabilis) and Bacillus subtilis (B. subtilis)]. The bacteria obtained from the soils were cultured and utilized to treat the arsenic polluted soils through the process of batch biosorption experiment. The experimental data were fitted with four kinetic models (Pseudo-first order, pseuodo-second order, Elovich and the intra-particle diffusion); and judgement on models performance was made using the values of the models’ coefficient of determination (R2).The four models tested were adequate for describing the biosorption kinetics but the leading performance of the intraparticle diffusion model with R2 of 0.991 for sorption by P. mirabilis and 0.972 for sorption by B. subtilis proved the diffusion process to be the rate-limiting step. This indicated that the systems were transport controlled.

 

http://dx.doi.org/10.4314/njt.v38i3.33

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Published

2019-06-29

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Section

Agricultural, Bioresources, Biomedical, Food, Environmental & Water Resources Engineering