|Title:||Energy requirement of suspension dewatering||Authors:||Chu C.P.
|Keywords:||Bond strength;Centrifugation;Coagulation;Consolidation;Friction||Issue Date:||2005||Journal Volume:||40||Journal Issue:||9||Start page/Pages:||1855-1869||Source:||Separation Science and Technology||Abstract:||
This work estimated the energy required to dewater a clay suspension, considering the total energy input received by the suspension from the dewatering device, the bond strength between adjacent water and solid surface, and the intra-cake friction loss. The centrifugal dewatering and consolidation dewatering were the testing means, and a UK ball clay suspension coagulated with alum was the testing sample. At the initial stage of centrifugal dewatering, most energy input was used to overcome process irreversibilities other than intra-cake friction, giving low-energy efficiency. To rotate faster or to flocculate at optimal dose needed more energy to dewater. On consolidation, most input energy was consumed to break down the bond strength to a critical residual water content, beyond which the friction loss became dominant. The methods presented herein provided a quantitative index to evaluate the efficiency of real dewatering process from an "ideal" dewatering system. Copyright ? Taylor & Francis, Inc.
Centrifugation; Chemical bonds; Coagulation; Energy management; Flocculation; Friction; Suspensions (fluids); Bond strength; Dewatering devices; Energy requirements; Friction loss; Dewatering; energy
|Appears in Collections:||化學工程學系|
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