Journal
DESALINATION
Volume 319, Issue -, Pages 18-24Publisher
ELSEVIER
DOI: 10.1016/j.desal.2013.04.004
Keywords
Ultrafiltration; Sludge discharge interval; Membrane fouling; Fouling mechanisms; Water treatment
Categories
Funding
- National Natural Science Foundation of China [51138008]
- State Key Laboratory of Urban Water Resource and Environment [2011TS08]
- Funds for Creative Research Groups of China [51121062]
- Cooperative Project of Chinese Academy of Science-Foshan [2011BY100291]
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The impact of sludge discharge on membrane fouling during ultrafiltration of surface water was investigated in this study. Discharge sludge and without discharge during UF were compared by measuring the increase of transmembrane pressure (TMP) and the accumulation of foulants with running time was studied. It was found that turbidity and dissolved organic carbon of retentate solution apparently increased as UF proceeded. Three-dimensional excitation/emission matrix fluorescence spectroscopy analyses of raw water and retentate solution demonstrated that UF could lead to the accumulation of humic and protein-like substances. Filtration experiments showed that membrane fouling could be alleviated by discharging the retentate solution after physical cleaning due to the reduced cake layer formation and concentration polarization. In addition, effects of sludge discharge intervals on the TMP and fouling characteristics were further investigated. Results indicated that short SDI would benefit control of both reversible and irreversible fouling. However, frequent discharge of retentate solution may increase the self-use water and decrease the water production rate of the UF system, leading to an expansion of running cost. In general, SDI was a critically important factor for both membrane fouling and water production rate. (C) 2013 Elsevier B.V. All rights reserved.
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