Pelleting flocculation—an alternative technique to optimise sludge conditioning |
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| Institution: | 1. School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing 100083, PR China;2. Institute of Multipurpose Utilization of Mineral Resources (Zhengzhou), Chinese Academy of Geological Sciences, Zhengzhou 450006, PR China;1. School of Materials and Metallurgy, Northeastern University, Shenyang 110819, China;2. School of Science, Changchun University of Science and Technology, Changchun 130022, China;1. Department of Industrial and Information Engineering, Second University of Naples, Via Roma 21, 81031 Aversa, Italy;2. Department of Environmental Biological and Pharmaceutical Sciences and Technologies, Second University of Naples, Via Vivaldi 43, 81100 Caserta, Italy;1. National Centre for Engineering in Agriculture, University of Southern Queensland, Toowoomba 4350, QLD, Australia;2. Scotia, NY, USA |
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| Abstract: | The process of pelleting flocculation, a further development of classical flocculation technology, is defined as a formation of wet pellets directly in a liquid medium. Apart from well described mechanisms of flocculation like perikinetic and orthokinetic flocculation, the mechanism responsible for the formation of dense agglomerates is the mechanical syneresis guaranteed by the appropriate reactor form. Upon the two established models in the literature: the series system and the parallel system, experiments were performed to simulate a layer-by-layer particle deposition on the so-called “mother seeds” conforming to the parallel system.The present paper deals with the results originating from laboratory scale experiments with model sludge, kaolin suspension. The layering process was conducted in the presence of different cationic flocculants and the resulting relationships with respect to their nature and to the applied energy level have been assessed. The achieved agglomerates exhibit an “onion like” structure with densities up to 1.42 g/cm3 and solid matter content up to 48% after gravity dewatering. Thus generated sludge agglomerates reveal the optimisation potential for sludge treatment manifested by improved characteristics achieved during the conditioning. |
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