Effect of microwave irradiation on anaerobic degradability of model kitchen waste |
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| Authors: | Juan Marin Kevin J Kennedy Cigdem Eskicioglu |
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| Institution: | 1. Dept. of Civil Engineering, University of Ottawa, 161 Louis Pasteur, Ottawa, Canada K1N 6N5;2. School of Engineering, University of British Columbia Okanagan, Kelowna, BC, Canada V1V 1V7;1. College of Agronomy, Northwest A&F University, Shaanxi, Yangling 712100, China;2. Research Center for Recycling Agriculture Engineering Technology of Shaanxi Province, Shaanxi, Yangling 712100, China;3. College of Forestry, Northwest A&F University, Shaanxi, Yangling 712100, China;1. Centre for Resource and Environmental Research, Beijing University of Chemical Technology, 15 Beisanhuan East Road, Chaoyang District, Beijing 100029, PR China;2. Institute of Ecological and Environmental Sciences, Sichuan Agricultural University, Chengdu, Sichuan 611130, PR China;1. School of Environment, Tsinghua University, Beijing 100084, China;2. Key Laboratory for Solid Waste Management and Environment Safety (Tsinghua University), Ministry of Education of China, Tsinghua University, Beijing 100084, China;1. School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China;2. Jiangsu Key Laboratory of Anaerobic Biotechnology, Jiangnan University, Wuxi 214122, China;3. Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment, Suzhou 215009, China;1. State Key Joint Laboratory of Environmental Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. School of Environment and Energy Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China |
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| Abstract: | High temperature and pressure microwave (MW) irradiation was investigated as a pre-treatment to enhance anaerobic biodegradability and methane production from a model kitchen waste (KW). Heating rates of 7.8, 3.9 and 1.9 °C/min from room temperature to a final pre-treatment temperature of 175 °C with 1 min temperature holding time were tested. MW irradiation was successful in solubilization of particulate chemical oxygen demand (COD) resulting in higher soluble COD, protein and sugar concentrations in the supernatant phase (<0.45 μm) as well as in the whole fraction of pretreated KW compared to controls (not pretreated). Anaerobic biodegradability of the supernatant and whole fractions of pretreated KW was assessed by using a batch biochemical methane potential assay (BMP) at 33 °C. Although the highest level of solubilization was achieved at a heating rate of 1.9 °C/min, improvement in anaerobic biodegradability was observed only at the fastest heating rate of 7.8 °C/min for whole waste and for all conditions with the supernatant phase. BMP indicated increased biodegradability of between 5% and 16% for the supernatant fraction relative to controls. For the whole fraction, anaerobic biodegradability improved by 9% at a heating rate of 7.8 °C/min. |
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