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Evolution of chemical composition and gas emissions from aged pig slurry during outdoor storage with and without prior solid separation

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URI
http://hdl.handle.net/20.500.11939/5707
DOI
10.1016/j.biosystemseng.2011.10.001
URL
https://www.sciencedirect.com/science/article/abs/pii/S1537511011001760?via%3Dihub
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openAccess
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Author
Moset, Verónica; Cambra-López, María; Estellés, Fernando; Torres, Antonio G.; Cerisuelo, Alba
Date
2012
Cita bibliográfica
Moset, V., Cambra-Lopez, M., Estelles, F., Torres, A.G., Cerisuelo, A. (2012). Evolution of chemical composition and gas emissions from aged pig slurry during outdoor storage with and without prior solid separation. Biosystems Engineering, 111(1), 2-10.
Abstract
Chemical composition and gas emissions from two types of pig slurry were evaluated: the liquid fraction of mechanical solid liquid separated slurry (SS), and raw slurry (RS). The slurry was obtained at the end of a pig fattening period and was stored in 1001 vessels for 15 weeks simulating outdoor storage conditions. During this period, representative samples were taken and analysed for chemical composition. Methane, carbon dioxide, ammonia, water vapour and nitrous oxide emissions were recorded. The results showed a high biological degradation during the first five weeks of outdoor storage in SS and RS slurries, as a result of an increase in the dissolved chemical oxygen demand, volatile fatty acids and carbon dioxide emission observed in this period. However, methanogenic activity was not evident until week 6 of storage in both slurries, confirmed by the volatile fatty acids accumulation and the negligible methane emissions during the first five weeks of storage. The results showed that differences in the initial slurry organic matter content, influenced by solid separation process affects the evolution pattern of the organic matter degradation. Storage time can considerably affect the biodegradability of organic matter in pig slurry.
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