| Title | Contribution to Circular Economy options of mixed agricultural wastes management: Coupling anaerobic digestion with gasification for enhanced energy and material recovery |
|---|---|
| ID_Doc | 29025 |
| Authors | Antoniou, N; Monlau, F; Sambusiti, C; Ficara, E; Barakat, A; Zabaniotou, A |
| Title | Contribution to Circular Economy options of mixed agricultural wastes management: Coupling anaerobic digestion with gasification for enhanced energy and material recovery |
| Year | 2019 |
| Published | |
| Abstract | Anaerobic digestion (AD) is an established process for the treatment of organic wastes and the production of renewable energy. However, high amounts of digestate produced by AD plants require enhancement for further use. This study investigates a conceptual model for the digestate enhancement by using a downstream gasification. It is based on a 'systemic 'approach' considering the interactions of every contributing process into the dual system. The digestate was provided by an Italian AD plant, that treats mixed agricultural wastes of pig manure (43%), cow manure (20%), maize and triticale silages (25%), and cereal bran (12%). Digestate air gasification experiments were conducted, in a downdraft fixed-bed reactor, at temperature range from 750 degrees C to 850 degrees C, with lambda varying from 0.14 to 0.34. Results have shown that gasification of digestate at 850 degrees C with lambda = 0.24, increased producer gas yield (65.5 wt %), and its LHV (2.88 MJ Nm (3)). The gas is classified as medium heating value fuel, suitable to generate electricity of 971 kWhel day(-1) to enhance the AD plant's economic viability. A carbonaceous material rich in macronutrients (P, K, Ca, Mg) was produced, with R-50 = 0.48, suitable for carbon sequestration. The study offers a resource closed loop approach of converting AD digestate into energy and soil fertilizer. Useful suggestions for policy makers and business can be drawn. (C) 2018 Published by Elsevier Ltd. |
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