期刊
WATER SCIENCE AND TECHNOLOGY
卷 65, 期 11, 页码 1939-1945出版社
IWA PUBLISHING
DOI: 10.2166/wst.2012.090
关键词
composting; eggshell waste; mixture design
资金
- MCTES, Portugal [PROTEC2 (SFRH/PROTEC/67369/2009)]
- National Funds through FCT - Foundation for Science and Technology [PEst-OE/AGR/UI0681/2011]
- Fundação para a Ciência e a Tecnologia [PEst-OE/AGR/UI0681/2011] Funding Source: FCT
Composting is one of the technologies recommended for pre-treating industrial eggshells (ES) before its application in soils, for calcium recycling. However, due to the high inorganic content of ES, a mixture of biodegradable materials is required to assure a successful procedure. In this study, an adequate organic blend composition containing potato peel (PP), grass clippings (GC) and wheat straw (WS) was determined by applying the simplex-centroid mixture design method to achieve a desired moisture content, carbon: nitrogen ratio and free air space for effective composting of ES. A blend of 56% PP, 37% GC and 7% WS was selected and tested in a self heating reactor, where 10% (w/w) of ES was incorporated. After 29 days of reactor operation, a dry matter reduction of 46% was achieved and thermophilic temperatures were maintained during 15 days, indicating that the blend selected by statistical approach was adequate for composting of ES.
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