title: Process contribution evaluation for COD removal and energy production from molasses wastewater in a BioH2-BioCH4-MFC-integrated system.
abstract: In this study, a three-stage-integrated process using the hydrogenic process (BioH2), methanogenic process (BioCH4), and a microbial fuel cell (MFC) was operated using molasses wastewater. The contribution of individual processes to chemical oxygen demand (COD) removal and energy production was evaluated. The three-stage integration system was operated at molasses of 20 g-COD L-1, and each process achieved hydrogen production rate of 1.1 ± 0.24 L-H2L-1day-1, methane production rate of 311 ± 18.94 mL-CH4L-1day-1, and production rate per electrode surface area of 10.8 ± 1.4 g m-2day-1. The three-stage integration system generated energy production of 32.32 kJ g-COD-1and achieved COD removal of 98 %. The contribution of BioH2, BioCH4, and the MFC reactor was 20.8, 72.2, and, 7.0 % of the total COD removal, and 18.7, 81.2, and 0.16 % of the total energy production, respectively. The continuous stirred-tank reactor BioH2at HRT of 1 day, up-flow anaerobic sludge blanket BioCH4at HRT of 2 days, and MFC reactor at HRT of 3 days were decided in 1:2:3 ratios of working volume under hydraulic retention time consideration. This integration system can be applied to various configurations depending on target wastewater inputs, and it is expected to enhance energy recovery and reduce environmental impact of the final effluent.
authors: Department of Environmental Science and Engineering, Ewha Womans University, 52 Ewhayeodae-gil, Seodaemun-gu, Seoul, 120-750, Republic of Korea.
authors: Jeonghee
authors: J
authors: Yun
authors: Department of Environmental Science and Engineering, Ewha Womans University, 52 Ewhayeodae-gil, Seodaemun-gu, Seoul, 120-750, Republic of Korea.
authors: Yun-Yeong
authors: YY
authors: Lee
authors: Department of Environmental Science and Engineering, Ewha Womans University, 52 Ewhayeodae-gil, Seodaemun-gu, Seoul, 120-750, Republic of Korea.
authors: Hyung Joo
authors: HJ
authors: Choi
authors: Department of Environmental Science and Engineering, Ewha Womans University, 52 Ewhayeodae-gil, Seodaemun-gu, Seoul, 120-750, Republic of Korea. kscho@ewha.ac.kr.
authors: Kyung-Suk
authors: KS
authors: Cho
mesh_terms: D001674:Bioelectric Energy Sources; D006859:Hydrogen / Q000737:chemistry*; D008965:Molasses; D010100:Oxygen / Q000737:chemistry*; D059205:Renewable Energy
chemical_list: D006859:Hydrogen; D010100:Oxygen
keywords: Biological hydrogen (BioH2); Biological methane (BioCH4); Integrated system; Microbial fuel cell (MFC); Molasses wastewater