Journal
BIORESOURCE TECHNOLOGY
Volume 172, Issue -, Pages 391-395Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2014.09.064
Keywords
Submerged membrane bioreactor; Filtration modes; Membrane fouling rate; Membrane fouling resistance; Specific cake resistance
Funding
- Higher Education Commission (HEC), Pakistan
- British Council, United Kingdom INSPIRE Program [SP-192]
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Relaxation or backwashing is obligatory for effective operation of membrane module and intermittent aeration is helpful for nutrients removal. This study was performed to investigate effects of different filtration modes on membrane fouling behavior and treatment in membrane bioreactor (MBR) operated at three modes i.e., 12, 10 and 8 min filtration and 3, 2, and 2 min relaxation corresponding to 6, 5 and 4 cycles/hour, respectively. Various parameters including trans-membrane pressure, specific cake resistance, specific oxygen uptake rate, nutrients removal and sludge dewaterability were examined to optimize the filtration mode. TMP profiles showed that MBR(8+2) with 8 min filtration and 2 min relaxation reduced the fouling rate and depicted long filtration time in MBR treating synthetic wastewater. MBR(12+3) was more efficient in organic and nutrients removal while denitrification rate was high in MBR(8+2). (C) 2014 Elsevier Ltd. All rights reserved.
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