水保所知识产出(1956---)知识库

This study investigated the vermicomposting of spent drilling fluid (SDF) from the nature-gas industry mixed
with cow dung in 0% (T1), 20% (T2), 30% (T3), 40% (T4), 50% (T5), and 60% (T6) ratio employing Eisenia fetida
under a 6 weeks trial. Eisenia. fetida showed better growth and reproduction performances in the first three
vermireactors (T1–T3), and the mortality was higher in the vermireactors that contained more spent drilling fluid
(≥ 40%). Vermicomposting results in a decrease in total organic carbon, C/N ratio, and an increase in EC, total
nitrogen, total phosphorous, total potassium compared to their initial values. The RadViz and VizRank showed
that vermicomposting results in a greater impact on the C/N ratio (15.24–35.48%) and EC (7.29–26.45%)
compared to other parameters. Activities of urease and alkaline phosphatase during vermicomposting initially
increased and then declined suggesting vermicompost maturity. Also, seed germination, mitotic index and
chromosomal abnormality assays using cowpea signified that the vermicomposts T2 is suitable for agricultural
use due to the lower phytotoxicity and cytotoxicity. The results indicated that SDF could be converted into good
quality manure by vermicomposting if mixed up to 20% with cow dung.