A review of the properties of biosludge and its relevance to enhanced dewatering processes |
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| Affiliation: | 1. Environmental Research Centre in Petroleum and Petrochemical Industries, School of Chemical and Petroleum Engineering, Shiraz University, Shiraz, Iran;2. Department of Chemical Engineering and Applied Chemistry, University of Toronto, 200 College Street, Toronto, Ontario, Canada M5S 3E5;1. Particulate Fluids Processing Centre, Department of Chemical and Biomolecular Engineering, The University of Melbourne, 3010, Australia;2. AECOM Australia Pty, Level 9, 8 Exhibition Street, Melbourne, 3000, Australia;3. Melbourne Water Corporation, 990 La Trobe Street, Docklands, 3008, Australia;1. CAS Key Laboratory for Urban Pollutant Conversion, Department of Chemistry, University of Science and Technology of China, Hefei 230026, China;2. School of Environmental and Chemical Engineering, Anhui Vocational and Technical College, Anhui 230011, China;3. Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, China;1. University of Chinese Academy of Science, China;2. State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;3. School of Environmental Studies, China University of Geosciences, Wuhan 430074, Hubei, China;4. Xi''an Polytechnic University, Xi''an 710048, China;5. Particuate Fluids Processing Centre, Department of Chemical and Biomolecular Engineering, The University of Melbourne, 301, Australia;1. Laboratoire de Thermique Energétique et Procédés (EAD 1932), UPPA, ENSGTI, BP 7511, 64075 Pau Cedex, France;2. Department of Chemical Engineering, Building 35, Clayton Campus, Monash University, Victoria 3800, Australia;3. OLEAD - 11 rue Monge, Parc Industriel Bersol 2, 33600 Pessac, France |
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| Abstract: | Difficulties in dewatering of biosludge result in economical and environmental issues for wastewater treatment plants. Various attempts have been made to overcome this problem by achieving some pretreatment on biosludge. The main purpose of all pretreatment methods is to modify the biosludge characteristics in such a way to boost settling of cells and solid particles of sludge, and to ease the release of water molecules from extracellular polymeric substances and cells and to facilitate flow of water through forming filter cake. The present work presents an overview of different properties of sludge and their measurement, the main reasons of sludge dewatering difficulty, the fundamentals of sludge dewatering and various proposed methods for sludge pretreatment. The advantages and drawbacks of different methods are described and the dominance of one over the others is discussed mostly with respect to energy requirement and environmental impacts. Some recommendations have been made for optimal application of each method. |
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| Keywords: | Sludge dewatering Sludge pretreatment Physical pretreatment Chemical pretreatment Enzymatic pretreatment |
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