Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 22, Issue 6, Pages 4644-4653Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-014-3708-8
Keywords
Vermicomposting; Sewage sludge; Mineralization rate; Cattle dung; Pig manure; Eisenia fetida
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Funding
- National Natural Science Foundation of China [51109161]
- PhD Programs Foundation of Ministry of Education of China [20110072120029]
- Fundamental Research Funds for The Central Universities [0400219187]
- National Spark Program of China [2010GA680004]
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This work evaluated the effects of additives on the chemical properties of the final products (vermicompost) from vermicomposting of sewage sludge and the adaptable characteristics of Eisenia fetida during the process. An experimental design with different ratios of sewage sludge and the additives (cattle dung or pig manure) was conducted. The results showed that the vermicomposting reduced total organic carbon and the quotient of total organic carbon to total nitrogen (C/N ratio) of the initial mixtures and enhanced the stability and agronomical value of the final products. Notably, principal component analysis indicated that the additives had significant effects on the characteristics of the vermicomposts. Moreover, the vermibeds containing cattle dung displayed a better earthworm growth and reproduction than those with pig manure. Additionally, redundancy analysis demonstrated that electrical conductivity (EC), pH, and C/N ratio played crucial roles on earthworm growth and reproduction. In all, the additives with high C/N ratio, pH buffering capacity, and low EC are recommended to be used for vermicomposting of sewage sludge.
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