A new approach for concurrently improving performance of South Korean food waste valorization and renewable energy recovery via dry anaerobic digestion under mesophilic and thermophilic conditions. (August 2017)

• Record Type: Journal Article
• Authors: Nguyen, Dinh Duc; Yeop, Jeong Seong; Choi, Jaehoon; Kim, Sungsu; Chang, Soon Woong; Jeon, Byong-Hun; Guo, Wenshan; Ngo, Huu Hao
• Is Part Of: Waste management. Volume 66(2017)
• Page Start: 161
• Page End: 168
• Publication Date: 2017-08
• Subjects: Dry anaerobic digestion -- Solids loading rate -- Mesophilic condition -- Thermophilic condition -- Food waste -- Renewable energy recovery; Hazardous wastes -- Periodicals; Refuse and refuse disposal -- Periodicals; 363.728
• DOI: 10.1016/j.wasman.2017.03.049
• Languages: English
• ISSNs: 0956-053X

Abstract

Graphical abstract: Highlights: A dry anaerobic digestion approach to Korean food waste was studied. The stability and performances of mesophilic and thermophilic AD process were assessed. The relationship between SLR and recoverable energy from dry AD was evaluated. TS reduction and CH4 production improved with increasing SLR under both operating conditions. The highest energy recovery of 1.09 MW h/ton FW was achieved under thermophilic conditions. Abstract: Dry semicontinuous anaerobic digestion (AD) of South Korean food waste (FW) under four solid loading rates (SLRs) (2.30–9.21 kg total solids (TS)/m 3 day) and at a fixed TS content was compared between two digesters, one each under mesophilic and thermophilic conditions. Biogas production and organic matter reduction in both digesters followed similar trends, increasing with rising SLR. Inhibitor (intermediate products of the anaerobic fermentation process) effects on the digesters' performance were not observed under the studied conditions. In all cases tested, the digesters' best performance was achieved at the SLR of 9.21 kg TS/m 3 day, with 74.02% and 80.98% reduction of volatile solids (VS), 0.87 and 0.90 m 3 biogas/kg VSremoved, and 0.65 (65% CH4 ) and 0.73 (60.02% CH4 ) m 3 biogas/kg VSfed, under mesophilic and thermophilic conditions, respectively. Thermophilic dry AD is recommended for FW treatment in South Korea because it is more efficient and has higher energy recovery potential when compared to mesophilic dry AD.