Abstract
Over the last years anaerobic digestion has been successfully established as technology to treat organic wastes. The perspective of turning, through a low-cost process, organic wastes into biogas, a source of renewable energy and profit, has certainly increased the interest around this technology and has required several studies aimed to develop methods that could improve the performance as well as the efficiency of this process. The present work reviews the most interesting results achieved through such studies, mainly focusing on the following three aspects: (1) the analysis of the organic substrates typically co-digested to exploit their complementary characteristics; (2) the need of pre-treating the substrates before their digestion in order to change their physical and/or chemical characteristics; (3) the usefulness of mathematical models simulating the anaerobic co-digestion process. In particular these studies have demonstrated that combining different organic wastes results in a substrate better balanced and assorted in terms of nutrients, pre-treatments make organic solids more accessible and degradable to microorganisms, whereas mathematical models are extremely useful to predict the co-digestion process performance and therefore can be successfully used to choose the best substrates to mix as well as the most suitable pre-treatments to be applied.
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Acknowledgments
This research was supported by the Italian Ministry of the Research and University in the framework of the National Research Project Advanced Treatments for Organic Waste Reuse and Energy Recovery funded in 2006 and the Research Project Energy Saving with Valorisation of the Secondary Energy Sources as Distributed Energy Sources funded in 2007. This research is also in the framework of the Project: Integrated system to treat buffalo slurry, aimed to recover water and safe energy—STABULUM-, funded, in agreement with the Decision of the European Commission No C(2010) 1261, 2nd March 2010, by the Agriculture Department of the Campania Region in the context of the Programme of Rural Development 2007–2013, Measure 124 “ Cooperation for development of new products, processes and technologies in the agriculture and food sectors. Flavia Liotta is a doctoral research fellow of the Erasmus Mundus Joint Doctorate program ETeCoS3 (Environmental Technologies for Contaminated Solids, Soils and Sediments) under the EU grant agreement FPA n° 2010-0009. This research was supported by the company Acqua e Sole s.r.l. as an associate member of the ETeCoS3 consortium.
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Esposito, G., Frunzo, L., Giordano, A. et al. Anaerobic co-digestion of organic wastes. Rev Environ Sci Biotechnol 11, 325–341 (2012). https://doi.org/10.1007/s11157-012-9277-8
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DOI: https://doi.org/10.1007/s11157-012-9277-8