期刊
WASTE MANAGEMENT
卷 35, 期 -, 页码 55-61出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.wasman.2014.10.014
关键词
Anaerobic digestion; Composting; (13)CPMAS NMR; Digestate; Renewable fertilizers
资金
- AGER Foundation: Multi-regional Solutions to improve the Environmental and Economic Sustainability of PIG manure management in the Regions of the Po and Veneto basin (SEES-PIG) project [2010-2220]
The aim of this paper was to assess the characteristics of the solid fractions (SF) obtained by mechanical separation of digestate, their compostability and compost quality. To do so, the SF of digestates obtained from anaerobic digestion of pig slurry, energy crops and agro-industrial residues were sampled in five plants located in Northern Italy. Results obtained indicated that anaerobic digestion by itself promoted the high biological stability of biomasses with a Potential Dynamic Respiration Index (PDRI) close to 1000 mgO(2) kg V S-1 h(-1). Subsequent composting of digestates, with an added bulking agent, did not give remarkably different results, and led only to a slight modification of the characteristics of the initial non-composted mixtures; the composts obtained fully respected the legal limits for high quality compost. Chemical studies of organic matter composition of the biomasses by using CP MAS C-13 NMR, indicated that the compost was composed of a high relative content of O-alkyl-C (71.47% of total C) (cellulose and hemicelluloses) and a low alkyl-C (12.42%) (i.e. volatile fatty acids, steroid-like molecules, aliphatic biopolymers and proteins). (C) 2014 Elsevier Ltd. All rights reserved.
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