Abstract
In the present study, Eudrilus eugeniae and Perionyx excavatus were used for vermistabilization of textile mill sludge in different combinations with cowdung for 60 days. A higher percentage of metal removal was observed in earthworm treated mixtures for cadmium (54.5%) followed by copper (36.0%), chromium (37.0%) and zinc (35.9%). Vermistabilized textile mill sludge + cowdung (1:1) showed a maximum percentage increase in total NPK, a significant (P < 0.05) increase in bacteria, fungi, and actinomycetes with a better earthworm survival rate. A higher amount of metallothionein protein was produced by E. eugeniae than P. excavatus. Further, 100% textile mill sludge showed a number of histological abnormalities like degeneration of cells, cellular debris, and uneven cellular compartmentation while textile mill sludge with cowdung showed normal earthworm histology. Results suggest that textile mill sludge + cowdung (1:1) combination is suitable for vermistabilization of textile mill sludge.
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