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Liquid Phase Separation of As(V) from Aqueous Solution Using Pretreated Paecilomyces variotii Biomass

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Biosorption of As(V) was carried out using Paecilomyces variotii biomass in batch and column mode experiments. Various pretreatments like autoclaving (APV), iron doping (FePV), and PVP K25 doping (PVPPV) of biomass were carried out to increase and compare the adsorption efficiency of As(V) onto the biomass. At maximum concentration of 2.5 mg/L of As(V), the removal was observed to be 58.4, 51.29, and 47.7% with FePV, PVPPV, and APV biomass respectively. PVPPV required comparatively less time (135 min) to attain equilibrium when compared to other adsorbents (165 min). FePV showed higher As(V) adsorption capacity (Qo) of 1.563 mg/L in batch mode. The batch mode data were analysed using Langmuir and Freundlich isotherms and first order and pseudo second-order kinetic models. The maximum removal was observed at pH 2 with FePV. In column mode experiments, the change in the flow rate and the bed volume affected the adsorption capacity of the adsorbent. FePV showed maximum adsorption of As(V) in column mode experiments also. The desorption experiments revealed that the adsorbents could be reused so that it can be a cost-effective adsorbent for As(V) removal from drinking water.
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Keywords: Paecilomyces variotii; arsenic; batch and column mode; desorption; kinetics

Document Type: Research Article

Affiliations: 1: Department of Microbial Biotechnology, School of Biotechnology and Genetic Engineering, Bharathiar University, Coimbatore, India,PSG Institute of Advanced Studies, Coimbatore, India 2: Department of Biotechnology, Karunya School of Biotechnology, Karunya University, Coimbatore, India 3: Department of Food Science and Technology, College of Agriculture, Chonbuk National University, Chonju, South Korea 4: Environmental Management and Biotechnology Division, DRDO-BU Centre for Life Sciences, Bharathiar University, Coimbatore, India 5: Department of Microbial Biotechnology, School of Biotechnology and Genetic Engineering, Bharathiar University, Coimbatore, India,Environmental Management and Biotechnology Division, DRDO-BU Centre for Life Sciences, Bharathiar University, Coimbatore, India

Publication date: 2010-01-01

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