Removal of corper(II) Ions from aqueous solution by a lactic acid bacterium

Abstract

-Enterococcus faecium, a lactic acid bacterium (LAB), was evaluated for its ability to remove copper(II) ions from water. The effects of the pH, contact time, initial concentration of copper(II) ions, and temperature on the biosorption rate and capacity were studied. The initial concentrations of copper(II) ions used to determine the maximum amount of biosorbed copper(II) ions onto lyophilised lactic acid bacterium varied from 25 mg L -1 to 500 mg L -1 . Maximum biosorption capacities were attained at pH 5.0 and 6.0. Temperature variation between 20°C and 40°C did not affect the biosorption capacity of the bacterial biomass. The highest copper(II) ion removal capacity was 106.4 mg per g dry biomass. The correlation regression coefficients show that the biosorption process can be well defined by the Freundlich equation. The change in biosorption capacity with time was found to fit a pseudo-second-order equation.

Evaluation of Aspergillus tamarii NRC 3 biomass as a biosorbent for removal and recovery of heavy metals from contaminated aqueous solutions

“…Copper is indeed essential, but in high doses, it can cause anemia, liver and kidney damage, and stomach and intestinal irritation. Wastewater especially the electrical and electroplating industries contain high levels of Cu 2+ and treatment of such waters to remove Cu 2+ is needed before disposal (Yilmaz et al 2010). The conventional methods used for the removal of heavy metals are chemical precipitation, lime coagulation, ion exchange, reverse osmosis, and solvent extraction (Rich and Cherry 1987).…”

Kinetic modelling of cadmium and lead removal by aquatic mosses

“…Various low cost adsorbents have been investigated for removing Cd, Pb and other metals from aqueous solutions: bentonite (Naseem and Tahir, 2001), expanded perlite (Torab-Mostaedi et al, 2010), mud (Salim, 1986), volcanic ash soil (Cajuste et al, 1996), pine bark (Al-Asheh et al, 1998), waste tire rubber ash (Mousavi et al, 2010), freshwater macrophytes (Schneider and Rubio, 1999), bacteria (Yilmaz et al, 2010), aquatic mosses (Al-Asheh et al, 1998;Martins and Boaventura, 2002), peat moss (McKay and Porter, 1997), alum sludge (Chu, 1999), soybean hulls, cottonseed hulls, rice straw and sugarcane bagasse (Marshall and Champagne, 1995), rice husk (Vieira et al, 2012;Senthil Kumar et al, 2010), olive stones (Calero et al, 2009), activated carbon from lignocellulosic residues (Giraldo and MorenoPiraján, 2008;Attia et al, 2010). The literature shows an extensive list of biomass used in metal biosorption; the novelty of this work is exactly the use of an aquatic moss, a less studied material.…”

Remoção De Cobre Por Biomassa De Enterococcus Faecalis E Salmonella Enterica Sorovar Enteritidis Em Solução Aquosa

“…6 O tratamento de ambientes contaminados por metais envolve processos físico-químicos de precipitação, floculação, eletrólise, cristalização ou adsorção; entretanto, esses processos podem ser onerosos e/ou contribuir para a formação de novos contaminantes ambientais, 7 além de ineficazes em baixas concentrações de metais, 8 podendo apresentar baixa eficiência de remoção, baixa seletividade e alto requerimento de energia. Considerando-se que muitos micro-organismos podem realizar a descontaminação de maneira a produzir menores riscos de perturbação do equilíbrio ecológico, as principais vantagens do uso destes para imobilização de metais incluem: baixos custos de operação, minimização do volume de químicos e alta eficiência na desintoxificação de efluentes diluídos.…”