Vermistabilization of primary sewage sludge

► Activated composting-vermicomposting system for better management of sewage sludge. ► Nutrients-rich vermicast suitable as organic fertilizer due to complete sanitization. ► Use of fresh vermicompost as bulking agent eliminates the need of external material. ► Temperature of 20 °C with high humidity is best suited condition for E. fetida. ► Optimum worm stocking density for vermiculture and vermicomposting is 0.5 and 3.0 kg m−2.