Pretreatment of recycled paper sludge with a novel high-velocity pilot cyclone: Effect of process parameters on convective drying efficiency

Mikko Mäkelä, Paul Geladi, Sylvia H. Larsson and Michael Finell

Applied Energy, 2014, vol. 131, issue C, 490-498

Abstract: To address the growing need for economically viable sludge processing technologies and associated resource recovery, a novel convective high-velocity pilot cyclone was set-up at the Swedish University of Agricultural Sciences in Umeå, Sweden. In essence this process entails feeding (⩽900kgh−1) a material to a heated high-velocity air flow (approx. 13×103m3h−1) allowing moisture removal at low temperatures. This equipment is expected to improve drying of challenging industrial sludge materials when used as a pretreatment method prior to further processing. Modeling results based on an experimental campaign on recycled paper mill sludge indicated that efficient drying with a specific energy consumption of ⩽1–1.2kWhkg−1H2O can be achieved with inlet air temperature levels ⩾40°C coupled with respective feeding capacity of ⩽750kgh−1.

Keywords: Biosolids; Cyclone; Experimental design; Optimization; Regression modeling; Sludge handling (search for similar items in EconPapers)
Date: 2014
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Citations: View citations in EconPapers (2)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:appene:v:131:y:2014:i:c:p:490-498

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DOI: 10.1016/j.apenergy.2014.06.057

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