Asian Science
Citation Index is committed to provide an authoritative, trusted
and significant information by the coverage of the most important
and influential journals to meet the needs of the global scientific
community.
Abstract: The effect of temperature, dry solids and C/N ratio on the growth of E. fetida
and on vermicomposting of waste activated sludge was studied in a small-scale
laboratory experiments. The maximum growth rate in 25°C, 15-20% dry solids and
a C/N ratio of 15 were 19±1, 21±2 and 20±2 mg/worm/day, respectively. Moreover,
changes in the physicochemical properties of the produced vermicasts were assessed.
The highest VS reduction (18%) occurred in dry solids of 15% and in a C/N ratio
of 25 the maximum VS reduction was 17%. TKN decreased with increase in dry solids
by the end of vermicomposting process, while the highest organic to mineral P
reduction occurred in the dry solids of 15%. The results for different levels
of C/N ratio showed that TKN and organic to mineral P of the worm-worked waste
activated sludge decreased with increase in C/N ratio. The pH of the produced
vermicompost in different levels of dry solids and C/N ratio increased in all
the experiments.