Rheological properties of hydrogen fermented food waste |
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| Affiliation: | 1. Department of Civil Engineering, Inha University, 100 Inha-ro, Nam-gu, Incheon, 22212, Republic of Korea;2. DaiHo Industry Co., Ltd., Seongdong-myeon, Nonsan-si, Chungcheongnam-do, 32925, Republic of Korea;1. Tianjin Key Laboratory of Marine Resources and Chemistry, College of Marine Science and Engineering, Tianjin University of Science and Technology, Tianjin 300457, PR China;2. Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Science, 7 Nanhai Road, Qingdao 266071, Shandong, PR China;1. College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, PR China;2. Department of Mechanical Engineering, Faculty of Engineering, Islamic University of Madinah, Madinah, P. O. Box 170, Saudi Arabia;3. Department of Engineering Sciences, PN Engineering College, National University of Sciences and Technology, Karachi 75350, Pakistan;4. Massachusetts Institute of Technology Portugal Program, Faculty of Engineering, University of Porto (FEUP), Portugal;1. Department of Civil Engineering, Inha University, 100 Inharo, Nam-gu, Incheon 402-751, Republic of Korea;2. Department of Environmental Health, 21 Chungjeong-ro, Dong-gu, Daejeon 34504, Republic of Korea;3. Department of Environmental Engineering, Korea Maritime and Ocean University, Busan 49112, Republic of Korea;1. Dokuz Eylul University, Faculty of Engineering, Department of Civil Engineering, 35160, Buca, Izmir, Turkey;2. Dokuz Eylul University, Graduate School of Natural and Applied Sciences, 35160, Buca, Izmir, Turkey;3. Usak University, Faculty of Engineering, Department of Civil Engineering, 64000 Usak, Turkey;1. Department of Environmental Engineering, Seoul National University of Science and Technology, 232 Gongreung-ro, Nowon-gu, Seoul, 01811, South Korea;2. Department of Civil Engineering, Inha University, 100 Inha-ro, Nam-gu, Incheon, 22212, South Korea;3. Department of Civil and Environmental Engineering, KAIST, 373-1 Guseong-dong, Yuseong-gu, Daejeon, 305-701, South Korea;4. Department of Environmental Engineering, Korea Maritime and Ocean University, 727 Taejong-ro, Yeongdo-Gu, Busan, 49112, South Korea |
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| Abstract: | Although rheological properties are essential in scaling up fermenters, there has been no report on hydrogen fermentation of organic solid wastes. In the present work, hydrogen fermentation of food waste (FW) was conducted at various substrate concentrations (10–50 g Carbo. COD/L) and operational pHs (4.5–6.5), and rheological properties were attained. High hydrogen production performance showing over 1.7 mol H2/mol hexoseadded was achieved at 10–40 g Carbo. COD/L and pH 5.5 and 6.0. The viscosity tended to increase with substrate concentration increase, and fermentation led to a significant reduction of viscosity. Before fermentation, zero viscosity and infinite viscosity of FW ranged 6.8–1274.1 mPa s and 2.2–58.1 mPa s, which were reduced to 10.4–346.2 mPa s and 1.1–5.3 mPa s after fermentation, respectively. Compared to substrate concentration, operational pH showed a less effect on rheological properties. At the similar volatile solids concentration range, hydrogen-fermented FW showed lower values of rheological properties than that of anaerobic digester sludge. Based on the agitation speed values assuring turbulent condition (complete mixing), the energy required for agitation can be reduced by 30–67% by lowering the applied agitation speed with fermentation time. |
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| Keywords: | Rheological properties Viscosity Shear thinning Agitation intensity |
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