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Waste Management & Research
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Evaluation of Compost Maturity By Means of Chemical and Microbial Analyses

R. Riffaldi

Institute of Agricultural Chemistry University of Pisa

R. Levi-Minzi

Institute of Agricultural Chemistry University of Pisa

A. Pera

Soil Microbiology Center of CNR, Via S. Michele 2-4, 56100 Pisa, Italy

M. de Bertoidi

Soil Microbiology Center of CNR, Via S. Michele 2-4, 56100 Pisa, Italy

Several chemical and microbiological parameters were tested during a 140 day period to characterize the stabilization process of a paper processing wastewater sludge composted with straw. The parameters indicate two months as a suitable period for the establishment of an equilibrium in the decay process, although some parameters show that compost reaches an acceptable level of stability in 30 days. Evaluation of stability in the end-product is difficult to define by only one parameter, whether it be chemical or biological.

Key Words: Composting • organic matter • humus • chemical parameters • nitrogen • ammonia • nitrate • germination test • microbiological parameters • stabilization process.

Waste Management & Research, Vol. 4, No. 1, 387-396 (1986)
DOI: 10.1177/0734242X8600400157
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M. de Bertoldi, A. Rutili, B. Citterio, and M. Civilini
Composting Management: a New Process Control Through O2 Feedback
Waste Management Research, January 1, 1988; 6(1): 239 - 259.
[Abstract] [PDF]