Vermi-Conversion of Anaerobic Sludges by Eisenia fetida Earthworms

Sludge management is considered a difficult and challenging task priority of environmental policy. This study evaluates the transformation anaerobic sludge agroindustrial wastes (cow manure, mixtures) directly to compost using Eisenia fetida earthworms (vermicomposting) in relation quality; moreover, it investigates effects different compositions on vermicompost physicochemical properties. In particular, biostabilization (AS1) produced excess from wastewater treatment plant (WWTP) Patras, Greece, mixed (AS2) originating effluents laboratory co-digestion system treating an waste mixture (olive mill wastewater, cheese whey, liquid cow manure ratio 55: 40: 5 (w/w), respectively) with dung (CD) was examined. Comparing mixtures CD-AS1 CD-AS2, superior results were obtained use AS2 since increase N-P-K observed when either 10% (22%, 51.8%, 2.4%, or 15% (38.7%, 14.1%, 8.1% used. Although reduction earthworms’ growth compared 100% CD, during vermicomposting CD-AS mixtures, 410 250 mg/earthworm sustained 85% CD-15% 80% CD-20% after period 63 70 days vermicomposting, respectively.