Simulation and assessment of sludge concentration and rheology in the processof waste activated sludge treatment
XIA Mingfang , WANG Zhiwei , WU Zhichao , WANG Xinhua , ZHOU Zhen , LU Jilai
DOI:
Received February 10, 2009,Revised April 27, 2009, Accepted , Available online
Volume 21,2009,Pages 1639-1645
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The process of using flat-sheet membrane for simultaneous sludge thickening and digestion (MSTD) was employed. The variations
of sludge concentration and rheology were characterized and simulated. Based on mass balance analysis, mathematical models were
developed and successfully used to predict and evaluate the variations of sludge concentration and the digestion e ciency in the MSTD
process. The apparent viscosity of sludge could be modeled as functions of mixed liquor suspended solids and shear rates. The sludge
in the MSTD process showed both shear-thinning and viscoplastic behaviour, and under various shear rates di erent rheological models
could be chosen to predict their flow behaviour. It was also found that sludge concentration and viscosity had significant correlations
with membrane fouling in the MSTD process.
