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This study demonstrated the feasibility to produce Bacillus thuringiensis subsp. kurstaki (Btk) based biopesticides using wastewater sludge as raw materials under solid-state fermentation (SSF). More than 10 10 CFU/g viable cells of Btk were obtained using sludge or its mixture with agricultural wastes. This study well considered the effect of heavy metals on Btk growth and their changes of...
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