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Fruit and vegetable wastes as co-substrates in anaerobic co-digestion
Publication . Azevedo, André; Lapa, Nuno; Moldão, Margarida; Gominho, Jorge; Duarte, Elizabeth; DQ - Departamento de Química; LAQV@REQUIMTE; Elsevier
Global population growth has led to a significant increase in food waste, including Fruit and Vegetable Waste (FVW). Anaerobic co-digestion offers a sustainable way to valorise FVW, especially when combined with Municipal Sewage Sludge (MSS) to mitigate imbalances in their mono-digestion. This study investigates the effects of storage temperatures (10 °C and 25 °C, which represent Mediterranean climates with an Atlantic influence like Portugal) on the degradation of apple, carrot, and banana peels. Changes in physicochemical properties were assessed and anaerobic co-digestion batch assays with purées of fresh and stored FVW alongside MSS were performed. Results indicated that apple peels purées, at a 1:2 peel-to-water ratio, achieved over the double of volatile solids concentration compared to MSS, with each FVW type having a C/N ratio above 40. Storage at 10 °C significantly reduced the degradation of total and volatile solids, as well as chemical oxygen demand, with apple peels retaining the highest carbohydrate concentrations. Anaerobic co-digestion with fresh FVW boosted biogas and CH4 production by 19.5% and 15.2%, respectively. FVW storage at 10 °C further enhanced CH4 yield and decreased H2S content by 71% relative to MSS mono-digestion. These findings demonstrate that mild storage temperatures can improve biogas quality and yield by facilitating controlled FVW degradation.
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Fundação para a Ciência e a Tecnologia
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UI/BD/151370/2021