High rate anaerobic digestion of wastewater separated from grease trap waste |
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| Affiliation: | 1. Hawaii Natural Energy Institute, University of Hawaii, Honolulu, HI 96816, USA;2. Civil and Environmental Engineering, University of Hawaii, Honolulu, HI 96822, USA;1. Department of Environment & Low-Carbon Science, School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China;2. State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China;1. Program in Environmental Technology and Policy, Korea University, Sejong 30019, Republic of Korea;2. Department of Environmental Engineering, College of Science and Technology, Korea University, Sejong 30019, Republic of Korea;3. Center of Technology for Energy, Environmental & Engineering, RTI International, Research Triangle Park, NC 27709, USA;1. Institute for Frontier Materials, Deakin University, Waurn Ponds, Victoria 3216, Australia;2. Chemical & Environmental Engineering, School of Engineering, RMIT University, Melbourne, Victoria 3000, Australia;3. Swedish Centre for Resource Recovery, University of Borås, 50190, Borås, Sweden;1. Center for Material Cycles and Waste Management Research, National Institute for Environmental Studies, Tsukuba 305-8506, Japan;2. School of Engineering, University of Hyogo, 2167 Shohsa, Himeji 671-2201, Japan;3. College of Industrial Technology, Nihon University, 1-2-1 Izumicho, Narashino 275-8575, Japan;4. School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;1. School of Chemical Engineering, The University of Adelaide, Adelaide 5005, Australia;2. Department of Chemical Engineering, Can Tho University, 3/2 Street, Can Tho, Viet Nam;3. Faculty of Food Technology Osijek, Josip Juraj Strossmayer University of Osijek, Croatia;4. Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, The Netherlands |
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| Abstract: | The co-production of biodiesel and methane gas from grease trap waste (GTW) was evaluated and compared against theoretical predictions of methane production from sole anaerobic digestion of GTW. The GTW was first processed into two separate phases comprised of fats, oil, and grease (FOG) and high strength wastewater (GTW wastewater). The GTW wastewater was then anaerobically digested in biochar packed up-flow column reactors to produce methane gas and a low-strength wastewater effluent while the FOG phase was set aside for conversion into biodiesel. Anaerobic digestion efficiencies that yielded chemical oxygen demand (COD) reductions up to 95% and methane headspace concentrations between 60 and 80% were achieved along with FOG to biodiesel conversion efficiencies of 90%. Methane production yields (m3 per kg COD reduced) achieved theoretical maximums with near total depletion of the volatile organic acids. High resolution images of biochar samples confirmed extensive coverage with thick biofilm communities. Microbial analysis revealed broad spectrum populations of anaerobic bacteria that ferment organic substrates to produce acetate, ethanol, and hydrogen as major end products as well as archaeal populations that produce methane gas. Energy calculations validated the co-production of biodiesel and methane gas from GTW as a competitive option relative to its co-digestion with sewage sludge. |
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| Keywords: | High rate anaerobic digestion Grease trap waste Wastewater Biochar |
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