Biosorption of heavy metals by Streptomyces species — an overview

Abstract

Heavy metals, derived from industrial wastewater discharge, present a serious threat to human health and to natural water. Biosorption is regarded as a cost-effective biotechnology for the treatment of high volume and low concentration wastewaters containing heavy metal(s) in the order of 1 to 100 mg L−1. Among the biomaterials for heavy metal removal which have been researched during the past decades is the Streptomyces species, a by-product of an industrial antibiotic fermentation process. This paper describes the hazards posed by heavy metals effluents on the environment and use of various Streptomyces species to remove heavy metals from aqueous solution. Characterization of Streptomyces species, factors affecting biosorption, biosorption isotherms and biosorption kinetics is discussed. Graphical abstract

SD/MnFe2O4 composite, a biosorbent for As(III) and As(V) removal from wastewater: Optimization and isotherm study

“…Owing to higher affinity of the biological material (sorbent) for the metal ion (sorbate), the latter is attracted and bound with different mechanisms [90]. Different types of mechanisms involved in biosorption phenomenon onto the biomass materials are microprecipitation, electrostatic interaction, chelation, complexation, ion exchange and physical adsorption by van der Waals forces, and chemical adsorption, surface precipitation, or their combinations [91,92].…”

Biosorption of Pb(II) ions from aqueous solutions by waste biomass ofStreptomyces fradiaepretreated with NaOH

“…The Freundlich adsorption isotherm describes heterogeneous surface adsorption and does not assume monolayer biosorption. [22] The linearized forms of the Langmuir and Freundlich isotherms are presented in Figures 4 and 5, respectively.…”

Environmental Microbiology and Biotechnology: Progress and Prospects

“…Cr(VI) removal from wastewater through microbial reduction of Cr(VI) to its trivalent form is a promising technique [36]. Dead Streptomyces ciscaucasicus and Streptomyces zinciresistens were used as biosorbents for the removal of zinc while Streptomyces aureofaciences was applied as a biosorbent for gold (Au 3+ ) [39]. Radiation-resistant microorganisms useful for environmental cleanup can be naturally occurring or engineered in the laboratory [38].…”