Biotechnological remediation of arsenate from aqueous solution using a novel bacterial strain: Isotherm, kinetics and thermodynamic studies

Arezoo Dadrasnia; Mohammed Maikudi Usman; Zaed Abutawila; Rahmat Omar; Salmah Ismail; Rosazlin Abdullah

doi:10.1007/s40201-019-00371-0

Biotechnological remediation of arsenate from aqueous solution using a novel bacterial strain: Isotherm, kinetics and thermodynamic studies

J Environ Health Sci Eng. 2019 Nov 7;17(2):571-579. doi: 10.1007/s40201-019-00371-0. eCollection 2019 Dec.

Authors

Arezoo Dadrasnia^{1

2}, Mohammed Maikudi Usman³, Zaed Abutawila^{2

4}, Rahmat Omar⁵, Salmah Ismail², Rosazlin Abdullah²

Affiliations

¹ 1Institute of Research Management and Services, Deputy Vice Chancellor (Research & Innovation) Office, University of Malaya, Kuala Lumpur, Malaysia.
² 2Institute of Biological Sciences, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia.
³ 3Department of Biotechnology, School of Life Sciences, Modibbo Adama University of Technology, P.M, Yola, B 2076 Nigeria.
⁴ 4Department of Biology, Faculty of Science, Al-Azhar University, Gaza, Palestine.
⁵ Agro Premier Biotech Sdn Bhd, No 64, Jalan Perdana Timur 8, Kepong Entrepreneur Park, Kepong, 52100 Kuala Lumpur, Malaysia.

Abstract

Arsenic is a global environmental contaminant that imposes a big health threat which requires an immediate attention to clean-up the contaminated areas. This study examined the biosorption ability of a novel Bacillus strain for the removal of arsenate (pentavalent arsenic) from aqueous solution. The optimum biosorption condition was studied as a function of biomass dosage, contact time and pH. Dubinin-Radushkevich (D-R), Freundlich, and Langmuir models were applied in describing the biosorption isotherm. The maximal biosorption capacity (92%) was obtained at 25 °C, biomass concentration 2000 mg/L at pH value of 4 and contact period of 50 min. Strain 139SI act as an admirable host to the arsenate. Thermodynamic assessment (ΔG⁰, ΔH⁰, and ΔS⁰) also suggested the chemisorption and feasible process of As(V) biosorption. The reuse study illustrated the highest recovery of 93% using 1 M HCl, and a decrease of 25% in recovery of As(V) ions after 10 times desorption process.

Keywords: Arsenate; Bacillus salmalaya strain 139SI; Biodegradation; Water pollution.