Article: Biosorption of heavy metals by utilising onion and garlic wastes Journal: International Journal of Environment and Pollution (IJEP) 2012 Vol.49 No.3/4 pp.179 - 196 Abstract: Onion (Allium cepa L.) and garlic (Allium sativum L.) wastes from market and food canning processes were used for adsorption of Pb2+, Sn2+, Fe2+, Hg2+, As3+ and Cd2+ from multi-component systems at different adsorbent/metal ion ratios. The influence of pH, contact time, temperature and the concentration of adsorbent and adsorbate were studied to optimise the conditions to be utilised on a commercial scale for the decontamination of effluents in a batch adsorption technique. The study was carried out at 50°C and efficiencies were found to be pH dependent. The equilibrium time was 30 minutes and kinetic parameters were calculated using a second order model. The maximum q value was 10.47 ± 0.52 mg g−1 obtained for Pb2+ at an adsorbent loading weight of 0.5 g/100 ml mixed ion solution. Desorption indicates maximum 71% recovery of metal ions, making the remediation process cost effective and reusable. The biomasses were used for removal of heavy metals from both synthetic and industrial effluents and the technique appears industrially applicable and viable. Inderscience Publishers - linking academia, business and industry through research

Title: Biosorption of heavy metals by utilising onion and garlic wastes

Authors: Rahul Negi; Gouri Satpathy; Yogesh K. Tyagi; Rajinder K. Gupta

Addresses: University School of Biotechnology, GGS Indraprastha University, Dwarka Sector-16, Delhi-110078, India. ' University School of Biotechnology, GGS Indraprastha University, Dwarka Sector-16, Delhi-110078, India. ' University School of Biotechnology, GGS Indraprastha University, Dwarka Sector-16, Delhi-110078, India. ' University School of Biotechnology, GGS Indraprastha University, Dwarka Sector-16, Delhi-110078, India

Abstract: Onion (Allium cepa L.) and garlic (Allium sativum L.) wastes from market and food canning processes were used for adsorption of Pb²⁺, Sn²⁺, Fe²⁺, Hg²⁺, As³⁺ and Cd²⁺ from multi-component systems at different adsorbent/metal ion ratios. The influence of pH, contact time, temperature and the concentration of adsorbent and adsorbate were studied to optimise the conditions to be utilised on a commercial scale for the decontamination of effluents in a batch adsorption technique. The study was carried out at 50°C and efficiencies were found to be pH dependent. The equilibrium time was 30 minutes and kinetic parameters were calculated using a second order model. The maximum q value was 10.47 ± 0.52 mg g⁻¹ obtained for Pb²⁺ at an adsorbent loading weight of 0.5 g/100 ml mixed ion solution. Desorption indicates maximum 71% recovery of metal ions, making the remediation process cost effective and reusable. The biomasses were used for removal of heavy metals from both synthetic and industrial effluents and the technique appears industrially applicable and viable.

Keywords: heavy metal biosorption; onion waste; garlic waste; wastewater treatment; market waste; food canning; heavy metals; effluent decontamination; batch adsorption; remediation cost; biomass.

DOI: 10.1504/IJEP.2012.050898

International Journal of Environment and Pollution, 2012 Vol.49 No.3/4, pp.179 - 196

Accepted: 11 Feb 2012
Published online: 19 Nov 2014 *

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Title: Biosorption of heavy metals by utilising onion and garlic wastes

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