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Optimum fluidization velocity of granular sludge bed for anaerobic fluidized‐bed bioreactors
Author(s) -
Xiaoguang Chen,
Ruobin Dai,
Xinyi Xiang,
Mengyan Tang
Publication year - 2013
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.4117
Subject(s) - fluidization , fluidized bed , bioreactor , materials science , superficial velocity , pellets , chromatography , pulp and paper industry , chemistry , waste management , mechanics , engineering , physics , flow (mathematics) , composite material , organic chemistry
Abstract BACKGROUND The models presented for bed optimum fluidization velocity ( u opt ), which was worthwhile for treatment efficiency and operation stability of anaerobic fluidized-bed bioreactors (AFB), were developed for AFB, and the anaerobic granular sludge diameter ( d p ) and shape were analyzed by a dynamic image analyzer . RESULTS The results showed that the granular size from 0.05 to 0.30 cm sludge dominated the total biomass (accounted for 92.34%) in an expanded granular sludge bed reactor, the mean sphericity 0.835 and mean granular diameter 0.1606 cm were achieved. The u opt range was 0.000949–0.2851 cm s ‐1 when d p was 0.05–0.30 cm, and the fluidization number was 8.43–38.77. The maximum value of 0.2851 cm s ‐1 was the basic parameter for pump power matching. From parametric sensitivity analyses, u opt was significantly influenced by liquid holdup, granular diameter, granular density and liquid viscosity . CONCLUSION According to the models of u opt , a better operating scheme for AFB can be provided; from parametric sensitivity analysis, further optimizing designs of such bioreactors can be achieved. © 2013 Society of Chemical Industry