Adsorption of copper metal by living Aspergillus niger L. biomass
2015
Gupta, Preeti | Pooja, | Kumar, Pradip | Singh, Nidhi
Water pollution is the contamination of water bodies e.g. lakes, rivers, oceans, aquifers and groundwater. It occurs when pollutants are discharged directly or indirectly into water bodies without adequate treatment to remove detrimental compounds. Among the pollutants which are discharged into water bodies, heavy metals are of most concern because other pollutants may be degraded by some microorganisms but metals cannot be degraded. In this study, adsorption of copper metal on living biomass of Aspergillus niger was investigated. 100 mg and 200 mg doses of living Aspergillus niger biomass and 10 minute contact time showed the most appropriate amount and duration for use in biosorption of copper effluent. Maximum adsorption capacity of 100 mg living biomass with respect to different concentrations of copper solution was observed as 95.66%, 91.33%, 63.91%, and 21.26% at 10ppm, 20ppm, 40ppm and 80 ppm respectively. In case of 200 mg biomass, as much as 98.43% metal removal was observed from the higher metal concentration (80ppm), The biosorption was gradually increased, but exceptionally, a negligible reduction was observed in biosorption from 65.95% at 10ppm to 51.72% at 20ppm. The adsorption isotherm studies indicate that Freundlich model is more suitable for describing the biosorption of 100 mg and 200 mg living Aspergillus niger biomass. The kinetic studies indicated that the biosorption process follows a pseudo-first order model for both the doses of biomass of Aspergillus niger for Cu metal.
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