Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.desal.2004.10.005
Title: Comparison of the filtration characteristics between biological powdered activated carbon sludge and activated sludge in submerged membrane bioreactors
Authors: Li, Y.-Z.
He, Y.-L.
Liu, Y.-H.
Yang, S.-C.
Zhang, G.-J. 
Keywords: Activated sludge
Biological powdered activated carbon
Flux
Membrane bioreactor
Membrane fouling
Issue Date: 20-Apr-2005
Source: Li, Y.-Z., He, Y.-L., Liu, Y.-H., Yang, S.-C., Zhang, G.-J. (2005-04-20). Comparison of the filtration characteristics between biological powdered activated carbon sludge and activated sludge in submerged membrane bioreactors. Desalination 174 (3) : 305-314. ScholarBank@NUS Repository. https://doi.org/10.1016/j.desal.2004.10.005
Abstract: The filtration performances of submerged membrane bioreactors (SMBR) with and without the addition of powdered activated carbon (PAC) were investigated respectively under the same feed and operation conditions. A series of experiments were conducted to analyze near-critical flux, effect of air-scouring rate and time of stable filtration operation of both systems. The experimental results demonstrated that pronounced flux enhancement was achieved by adding 1.2 g/L PAC. The near-critical flux for the biological powdered activated carbon (BPAC) system was about 32% higher than that for the activated sludge (AS) system. Increasing the air-scouring rate led to a more significant flux improvement for the BPAC system compared to the AS system. Long-term operation indicated that, at constant flux, the TMP increasing rate of the BPAC system could be lagged and thus cause the extension of operating intervals about 1.8 times compared to the AS system. Quantitative calculations showed the total hydraulic resistance of the BPAC system was about 44% lower than that of the AS system, and this decrease was mainly caused by the reduction in cake resistance. Analyses were then made from various aspects such as floc size distribution and apparent viscosity of the mixed liquor to elucidate the major factors giving rise to different filtration characteristics. © 2005 Elsevier B.V. All rights reserved.
Source Title: Desalination
URI: http://scholarbank.nus.edu.sg/handle/10635/65318
ISSN: 00119164
DOI: 10.1016/j.desal.2004.10.005
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