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selected physicochemical and microbiological analysis of vermicomposted lime and chrome sludge wastes from tannery industry

Abstract

The present stusdy deals with selected physicochemical and microbiological analyses of vermicomposted lime sludge and chrome sludge wastes in two different ratios (1: 1 and 3:1 of lime sludge/chrome sludge and soil.). The results have shown that pH changed to neutral and EC level decreased in both sludges on vermicomposting. Available NPK contents of the vermicomposts were higher than both the raw sludges. The fungal and actinomycete population were higher in raw chrome sludge and its composts than raw lime sludge and its composts. Fungal species such as A niger, A. flavus, A terreus, Mucor sp. and Penicillium sp. and Actinomycetes species such as Actinomyces sp. and Streptomyces sp. were present in both the sludges and their composts.Nocardia sp. were present only in vermicomposts of both sludges and not their raw forms. This shows that these microbial populations may be involved in the degradation process of toxic wastes. The present studyshows that the negative environmental impact of the tannery wastes can be reduced with the help of microorganisms.

d.dheepa, Anitha Subash and R. Parvatham

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