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Transformation and availability of nutrients and some heavy metals were assessed during the integrated composting–vermicomposting of both primary sewage sludge (PSS) and waste activated sewage sludge (WAS) using matured vermicompost as indigenous bulking material and employing Eisenia fetida as earthworm species. Vermicomposting resulted in significant increase in total N (TN) (PSS: 41.7–64.6%, F=11.6, P<0.05; WAS: 36.4–58.6%, F=6.4, P<0.05), water soluble N (WSN) (PSS: 37.1–50.5%, F=30.1, P<0.05; WAS: 40.1–53.0%, F=27.6, P<0.05), total P (TP) (PSS: 39.9–69.8%, F=27.1, P<0.05; WAS: 32.2–56.6%, F=21.4, P<0.05) and water soluble P (WSP) (PSS: 25.2–34.3%, F=163.9, P<0.05; WAS: 24.1–34.2%, F=144.3, P<0.05) as compared to the initial compost material depending on different experimental conditions. The study demonstrated that the vermicomposting significantly improved the …