Evaluation of the compost quality of vermicomposting process applied to different types of sludge using Eisenia fetida

Abstract

This study was carried out in 3,000 g composting containers under open test conditions, sewage and industrial sludge incubated by soil worms (Eisenia fetida) and vermicompost produced. For this purpose; domestic and industrial sludge were incubated with manure at 5%, 10%, 15%, 20% and control. The change in quality parameters monitored such as pH, electrical conductivity, humidity, total nitrogen, total organic carbon and C/N by taking samples from the vermicompost obtained on day 1st, day 30th, day 60th and day 90th during the times of incubation. Optimal incubation time was found to be 60 d for both sludge types and 15% (SS3) sewage sludge dose was found as optimal dose according to C/N ratio. The difference between sludge doses was statistically insignificant in the industrial sludge.