Vermicomposting of anaerobically digested sewage sludge with hazelnut husk and cow manure by earthworm Eisenia foetida

Vermicomposting of organic waste has an important part to play in integrated management strategy. The aim the present study was investigate ability epigeic earthworm Eisenia foetida transform anaerobically digested sewage sludge (SS) amended with hazelnut husk (HH) and cow manure (CM) different proportions under laboratory condition (in darkness at 25°C0,5 0C). Two approaches investigated were: (1) find best medium for growth reproduction E. feed mixtures, (2) analyze heavy metal concentrations mixtures SS-HH-CM before after vermicomposting, (3) explore metals accumulation earthworms mixtures. Number biomass contents were periodically monitored. results indicated that maximum attained mixture 20% SS + 40% CM HH while number highest 30% 35% during vermicomposting period. Heavy concentration (Zn, Cu, Cd, Pb, Ni Cr) all decreased associated increasing time. metals’ content lower than initial Metal analysis revealed considerable bioaccumulation their bodies’ tissue. body showed proportion promoted body.