Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.19/2934
Título: Influence of the composition of the initial mixtures on the chemical composition, physicochemical properties and humic-like substances content of composts
Autor: Silva, Elisabete
Lemos, Luís Teixeira de
Nunes, Olga C.
Cuhna-Queda, Ana Cristina
Palavras-chave: Bulking agent
Humic-like substances
Initial C/N ratio
Maturity
Raw materials
Stability
Data: 9-Out-2013
Editora: Elsevier
Citação: Silva et al., 2014
Resumo: The influence of the proportion of C- and N-rich raw materials (initial C/N ratio) and bulking agent on the chemical functional groups composition, humic-like substances (HS-like) content and physicochemical properties of composts was assessed. To achieve these goals, seven initial mixtures (BA1–6 and C1) of dog food (N-rich raw material) were composted with wheat flour (C-rich raw material). Composts were analyzed in terms of chemical functional groups, physicochemical, maturity and stability parameters. The C-rich raw material favored the formation of oxidized organic matter (OM) during the composting process, as suggested by the variation of the ratios of the peaks intensity of FT-IR spectra, corresponding to a decrease of the polysaccharides and an increase of aromatic and carboxyl-containing compounds. However, although with high proportion of C-rich raw material, mixtures with low initial C/N seems to have favored the accumulation of partially oxidized OM, which may have contributed to high electrical conductivity values in the final composts. Therefore, although favoring the partial transformation of OM into stabilized HS-like, initial mixtures with high proportion of C-rich raw material but with low initial C/ N led to unstable composts. On the other hand, as long as a high percentage of bulking agent was used to promote the structure of biomass and consequently improve of the aeration conditions, low initial C/N was not a limiting factor of OM oxidation into extractable stabilized humic-like acids.
Peer review: yes
URI: http://hdl.handle.net/10400.19/2934
DOI: 10.1016/j.wasman.2013.09.011
Versão do Editor: http://dx.doi.org/10.1016/j.wasman.2013.09.011
Aparece nas colecções:ESTGV - DA - Artigos publicados em revista científica (Indexados à ISI)

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