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.
Organic biowastes blend selection for composting industrial eggshell by-product: experimental and statistical mixture design
Micaela A. R. Soares, Sandra R. Andrade, Rui C. Martins, Margarida J. Quina, Rosa M. Quinta-Ferreira; Organic biowastes blend selection for composting industrial eggshell by-product: experimental and statistical mixture design. Water Sci Technol 1 June 2012; 65 (11): 1939–1945. doi: https://doi.org/10.2166/wst.2012.090
Download citation file: