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Vermistabilization of primary sewage sludge

Vermistabilization of primary sewage sludge,10.1016/j.biortech.2010.10.031,Bioresource Technology,Subrata Hait,Vinod Tare

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Vermistabilization of primary sewage sludge   (Citations: 3)
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An integrated composting–vermicomposting process has been developed for utilization of primary sewage sludge (PSS). Matured vermicompost was used as bulking material and a source of active microbial culture during aerobic activated composting (AAC). AAC resulted in sufficient enrichment of bulking material with organic matter after 20 cycles of recycling and mixing with PSS and produced materials acceptable for vermicomposting. Vermicomposting caused significant reduction in pH, volatile solids (VS), specific oxygen uptake rate (SOUR), total organic carbon (TOC), C/N ratio and pathogens and substantial increase in electrical conductivity (EC), total nitrogen (TN) and total phosphorous (TP) as compared to compost. Environmental conditions and stocking density have profound effects on vermicomposting. Temperature of 20°C with high humidity is favorable environmental condition for vermicomposting employing Eisenia fetida. Favorable stocking density range for vermiculture is 0.5–2.0kgm−2 (optimum: 0.5kgm−2) and for vermicomposting is 2.0–4.0kgm−2 (optimum: 3.0kgm−2), respectively.
Journal: Bioresource Technology - BIORESOURCE TECHNOL , vol. 102, no. 3, pp. 2812-2820, 2011
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