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REMOVAL OF CHROMIUM (VI) FROM AQUEOUS SOLUTION BY CHEMICALLY MODIFIED BIOMASS OF ASPERGILLUS NIGER

Abstract

Sporulated biomass of Aspergillus niger was evaluated for its ability to remove Chromium (VI) by biosorption both prior to and after subjecting it to various physical treatments such as autoclaving and chemical treatments with acids, alkali, chelating agent and cross-linker. Pretreatments with acetic acid (5%), phosphoric acid (10%), gluteraldehyde (2%), oxalic acid (0.001M and 0.01M) and hydrochloric acid (1M, 5M) after autoclaving enhanced the adsorption capacity of Aspergillus niger biomass, which ranged from 2.16% to 86.88% in comparison with the untreated biomass. Comparison between the sporulated and mycelial biomass indicated effectiveness of the mycelial biomass in sorption of Chromium (VI). The mycelial biomass treated with 5M HCl combined with autoclaving proved to be the most successful in the removal of Chromium (VI).

SNEHA NARVEKAR AND VARSHA K.VAIDYA

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