2.STUDY OF BIO REMOVAL OF SILVER WASTE USING FUNGAL ISOLATES By M.F.MANSURI 1 AND K.C.PATEL2
Abstract
Extensive use of silver has led to serious problems of contamination of terrestrial and aquatic systems. Disposal of silver waste to surface and subsurface waters pose unacceptable health risks. The chief source of silver contamination of water is silver thiosulfate complexes in photographic developing solutions that photofinishers discard directly to sewers. Silver complexed with thiosulfate is difficult to remove from photographic waste. Thus a two stage removal approach was used. Thiosulfate oxidizing bacteria ware initially applied to breakdown the silver thiosulfate complex. The liberated silver is then removed using fungal system. Species of Mucor,
Aspergillus and Rhizopus were employed for this. As much as 70% removal of silver is reported here. These findings can help in the development of a green economic process.
KEY WORD: Silver, Thiosulfate Oxidising Bacteria, Fungi.
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