Anaerobic co-digestion: a sustainable approach to food processing organic waste management
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ORIGINAL ARTICLE
Anaerobic co‑digestion: a sustainable approach to food processing organic waste management Fetra J. Andriamanohiarisoamanana1 · Seiichi Yasui2 · Takaki Yamashiro3 · Vonifanja Ramanoelina4 · Ikko Ihara1 · Kazutaka Umetsu3 Received: 13 November 2019 / Accepted: 13 April 2020 © Springer Japan KK, part of Springer Nature 2020
Abstract Anaerobic digestion is a promising technology to control pollution and recover energy from organic matter. In this study, batch experiments were conducted to investigate methane yields of seven organic wastes from a food processing company and dairy manure (DM) from a tie-stall barn having two straw lengths (2 cm and 10 cm) at 52 °C. This was followed by anaerobic co-digestion of all organic wastes with DM in bench experiments. The results indicated that the highest methane yield was observed in lipid-rich waste (basil sauce, 0.47 L/gVS) followed by carbohydrate-rich wastes (pumpkin processing residue, 0.21 L/gVS); the lowest yield was obtained from tomato leaves and stems (0.09 L/gVS). Furthermore, the methane yield from DM was about 0.18 L/gVS, irrespective of the straw length. Anaerobic co-digestion of food processing residues with DM demonstrated a 41% increase in methane yield (0.24 L/gVS), as compared to DM alone (0.17 L/gVS), while the milling of both organic wastes and DM did not affect methane yields. Thus, integration of anaerobic co-digestion in food processing residue management is a sustainable approach that guarantees a closed-loop flowing economy and makes food processing environmentally friendly. Keywords Anaerobic co-digestion · Tie-stall barn · Dairy manure · Food processing waste · Closed-loop economy · Sustainability
Introduction Anaerobic digestion (AD) is a promising technology to control pollution and to recover energy from organic wastes. It plays multiple roles in the energy, environment and economy nexus as it converts organic wastes into renewable energy carrier (biogas) and a good quality organic fertilizer (digestate). Moreover, a growing trend in the policies with respect to energy transition, that is transition from the current * Ikko Ihara [email protected]‑u.ac.jp 1
Department of Agricultural Engineering and Socio‑Economics, Kobe University, 1‑1 Rokkodai‑cho, Nada, Kobe 657‑8501, Japan
2
Airwater Co. Ltd, Sapporo, Hokkaido 003‑0027, Japan
3
Graduate School of Animal and Food Hygiene, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido 080‑8555, Japan
4
Ecole Supérieure Des Sciences Agronomiques, Université D’Antananarivo, 101 Antananarivo, Madagascar
development paradigms to renewable ones, highlights the importance of AD in a green and circular bio-economy to guarantee a sustainable economic development and to combat climate change. Although the technology has been established for many decades, there is limited information about its capacity to co-digest various types of organic wastes from food processing companies as well as dairy manure from tie-stall barn. Dairy manure (DM) is among the m
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