Competitive adsorption in a ternary system of toxic metals and rare earth elements using Desmodesmus multivariabilis: empirical and kinetic modelling
- 205 Downloads
The presence of competing metals in industrial wastewater creates problems of selectivity for binding sites during biosorption of cationic metallic species on microbial cell surfaces. For this reason, modelling of adsorption and uptake of multimetal solutions based on observation of performance of single metal species since this neglects the competition for reactive sites typical in multimetal solutions. In this study, a culture of the green alga Desmodesmus multivariabilis previously isolated from eutrophic freshwater was used as a biosorbent for adsorption/desorption of different metals in a mixed metal solution under varying environmental conditions. The Extended Langmuir Model (ELM) and Combined Langmuir and Freundlich Model (CLFM) were used to evaluate the data from a ternary metallic system. AQUASIM was used for optimization and simulation of kinetic data in ternary systems. The ELM performed better than CLFM with correlation coefficient of approximately 0.99. The highest uptake was observed for thallium with q max = 909.09 mg g−1 in single metal solution. This value was reduced to q max = 77.278 mg g−1 in the presence of other metals which demonstrated the competitive effects of other metal ions in solution. The q max value of lanthanum (La) decreased from 100 in single metals to 71.3 mg g−1 in multimetal solution; whereas, the q max = of cadmium (Cd) decreased from 48.5 to 40.1 mg g−1. Recovery of metals by D. multivariabilis was the highest for La at 90.92% followed by Cd at 90.15%. Competitive inhibition models provided a better insight on the potential for treatment of actual industrial wastewater with varying environmental factors.
KeywordsDesmodesmus multivariabilis Thallium Cadmium Lanthanum Biosorption Adsorption models
The authors would like to thank the University of Pretoria Commonwealth scholarship and the Division of Environmental Engineering and Water Utilisation at the University of Pretoria for the research support.
- Ahalya N, Ramachandra T, Kanamadi R (2003) Biosorption of heavy metals. Res J Chem Environ 7:71–79Google Scholar
- Bakatula E, Cukrowska E, Weiersbye I, Mihaly-Cozmuta L, Peter A, Tutu H (2014) Biosorption of trace elements from aqueous systems in gold mining sites by the filamentous green algae (Oedogonium sp.) J Geochem Explor 144:492–503Google Scholar
- Komy ZR, Gabar RM, Shoriet AA, Mohammed RM (2006) Characterisation of acidic sites of pseudomonas biomass capable of binding protons and cadmium and removal of cadmium via biosorption. World J Microbiol Biotechnol 22:975–982Google Scholar
- Kotrba P (2011) Microbial biosorption of metals—general introduction. SpringerGoogle Scholar
- Mohan D, Chandler S (2001) Single component and multi-component adsorption of metal ions by activated carbons. Colloids Surf A 177:183–196Google Scholar
- Oliveira RC, Guibal E, Garcia O Jr (2012) Biosorption and desorption of lanthanum (III) and neodymium (III) in fixed-bed columns with sargassum sp.: perspectives for separation of rare earth metals. Biotechnol Prog 28:715–722Google Scholar
- Pagnanelli F (2011) Equilibrium, kinetic and dynamic modelling of biosorption processes. In: Kotrba P (ed) Microbial Biosorption of Metals: Springer, pp. 59–120Google Scholar
- Reichert P (1998) AQUASIM 2.0—user manual. Swiss Federal Institute for Environmental Science and Technology. Dubendorf, SwitzerlandGoogle Scholar
- Reynel-Avila HE, Mendoza-Castillo DI, Hernández-Montoya V, Bonilla-Petriciolet A (2011) Multicomponent removal of heavy metals from aqueous solution using low-cost sorbents. Water production and wastewater treatment, 1st edn. Nova Science Publishers 69–99Google Scholar
- Rodrigues MS, Ferreira LS, Monteiro de Carvalho JC, Lodi A, Finocchio E, Converti A (2012) Metal biosorption onto dry biomass of Arthrospira (Spirulina) platensis and Chlorella vulgaris: Multi-metal systems. J Hazard Mat 217–218:246–255Google Scholar
- Volesky B (2001) Detoxification of metal-bearing effluents: biosorption for the next century. Hydrometallurgy 59:203–216Google Scholar