Bio-drying and size sorting of municipal solid waste with high water content for improving energy recovery |
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| Authors: | Li-Ming Shao Zhong-He Ma Hua Zhang Dong-Qing Zhang Pin-Jing He |
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| Institution: | 1. Team of Solar Energy and Medicinal Plants EESPAM, Teacher’s Training College, Cadi Ayyad University, BO 2400 Marrakesh, Morocco;2. Laboratory of Automation, Environment and Transfer Processes LAEPT, Faculty of Sciences Semlalia, Cadi Ayyad University, Marrakesh, Morocco;1. College of Resources and Environmental Science, China Agricultural University, Beijing 100193, China;2. Bangor University, Deiniol Rd., Bangor, United Kingdom;1. GMB BioEnergie BV, P.O. Box 2, 4043 ZG Opheusden, The Netherlands;2. Delft University of Technology, Department of Biotechnology, Julianalaan 67, 2628 BC Delft, The Netherlands;3. Ghent University, Department of Biosystems Engineering, Faculty of Bioscience Engineering, Coupure links 653, B-9000 Gent, Belgium;1. Center for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, 11A Datun Road, Beijing 100101, PR China;2. University of Chinese Academy of Sciences, Beijing 100039, PR China |
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| Abstract: | Bio-drying can enhance the sortability and heating value of municipal solid waste (MSW), consequently improving energy recovery. Bio-drying followed by size sorting was adopted for MSW with high water content to improve its combustibility and reduce potential environmental pollution during the follow-up incineration. The effects of bio-drying and waste particle size on heating values, acid gas and heavy metal emission potential were investigated. The results show that, the water content of MSW decreased from 73.0% to 48.3% after bio-drying, whereas its lower heating value (LHV) increased by 157%. The heavy metal concentrations increased by around 60% due to the loss of dry materials mainly resulting from biodegradation of food residues. The bio-dried waste fractions with particle size higher than 45 mm were mainly composed of plastics and papers, and were preferable for the production of refuse derived fuel (RDF) in view of higher LHV as well as lower heavy metal concentration and emission. However, due to the higher chlorine content and HCl emission potential, attention should be paid to acid gas and dioxin pollution control. Although LHVs of the waste fractions with size <45 mm increased by around 2× after bio-drying, they were still below the quality standards for RDF and much higher heavy metal pollution potential was observed. Different incineration strategies could be adopted for different particle size fractions of MSW, regarding to their combustibility and pollution property. |
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