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Environ Technol

Title:		Compost stability assessment using a secondary metabolite: geosmin
Author(s):		Li HF; Imai T; Ukita M; Sekine M; Higuchi T;
Address:		"Department of Civil and Environmental Engineering, Yamaguchi University, 2-16-1, Tokiwadai, Ube, Yamaguchi 755-8611, Japan"
Journal Title:		Environ Technol
Year:		2004
Volume:		25
Issue:		11
Page Number:		1305 - 1312
DOI:		10.1080/09593332508618374
ISSN/ISBN:		0959-3330 (Print) 0959-3330 (Linking)
Abstract:		"Composting is a process involved not only in transformation of organic matter (OM), but also for transition of the microbial community. Microorganisms can directly provide important information on the stages and characteristics of composting. This paper was aimed at characterizing compost stability by a microbial secondary metabolite, geosmin, which is a volatile compound presenting an earthy smell. Since secondary metabolite production is dependent on the nutrient state of microorganisms, its production in association with physical and chemical parameters was monitored in the laboratory-scale and plant-scale composting processes. The results showed that the peaked geosmin liberation was consistent with stable state of composting indicated by the ambient temperature achieved, a slightly alkaline product and steady states of dissolved organic carbon (DOC), N and P contents and OM degradation in the laboratory-scale experiment. It was also in accordance with the stability identified by the facilities and CO2 respiration rate in the plant-scale composting. In addition, the production of geosmin was correlated with the C/N ratio for the solid sample. These results demonstrated that geosmin levels could be used as an index for the compost stability assessment in different composting processes with various organic solid wastes"
Keywords:		Bacteria Biotransformation Environmental Monitoring/*methods Naphthols/*analysis Odorants/analysis Organic Chemicals/metabolism *Refuse Disposal;
Notes:		"MedlineLi, H F Imai, T Ukita, M Sekine, M Higuchi, T eng England 2004/12/25 Environ Technol. 2004 Nov; 25(11):1305-12. doi: 10.1080/09593332508618374"