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DOI: https://doi.org/10.4491/eer.2018.375
Maximizing biogas production by pretreatment and by optimizing the mixture ratio of co-digestion with organic wastes
Beom Lee1, Jun-Gyu Park1, Won-Beom Shin1, Beom-Soo Kim2, Byoung-su Byun3, and Hang-Bae Jun1
1Department of Environmental Engineering, Chungbuk National University, Cheongju 28644, Republic of Korea
2Department of Chemical Engineering, Chungbuk National University, Cheongju 28644, Republic of Korea
3Energy Policy Support Team, Korea Environment Corporation, Incheon 22689, Republic of Korea
Corresponding Author: Hang-Bae Jun ,Tel: 82-43-261-2470 , Fax: 82-43-264-2465, Email: jhbcbe@cbnu.ac.kr
Received: October 27, 2018;  Accepted: January 3, 2019.
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Anaerobic digestion is a popular sewage sludge treatment method as it provides significant pollution control and energy recovery. However, the low C/N ratio and poor biodegradability of sewage sludge necessitate pretreatment methods that improve solubilization under anaerobic conditions in addition to anaerobic co-digestion with other substrates to improve the process efficiency. In this study, three pretreatment methods, namely microwave irradiation, ultrasonication, and heat treatment, were investigated, and the corresponding improvement in methane production was assessed. Additionally, the simplex centroid design method was utilized to determine the optimum mixture ratio of food waste, livestock manure, and sewage sludge for maximum methane yield. Microwave irradiation at 700 W for 6 min yielded the highest biodegradability (62.0%), solubilization efficiency (59.7%), and methane production (329 mL/g VS). The optimum mixture ratio following pretreatment was 61.3% pretreated sewage sludge, 28.6% food waste, and 10.1% livestock manure. The optimum mixture ratio without pretreatment was 33.6% un-pretreated sewage sludge, 46.0% food waste, and 20.4% livestock manure. These results indicate that the choice of pretreatment method plays an important role in efficient anaerobic digestion and can be applied in operational plants to enhance methane production. Co-digestion of sewage sludge with food waste and livestock manure was also beneficial.
Keywords: Anaerobic digestion | Mixture ratio | Pretreatment | Sewage sludge | Simplex centroid design
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