Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/13154
Title: Study of pre-denitrification submerged membrane bioreactor for domestic wastewater treatment
Authors: TAN TECK WEE
Keywords: aeration, fouling, mean cell residence time (MCRT), membrane bioreactor (MBR), mixed liquor recycle ratio (R), pre-denitrification
Issue Date: 17-Apr-2008
Source: TAN TECK WEE (2008-04-17). Study of pre-denitrification submerged membrane bioreactor for domestic wastewater treatment. ScholarBank@NUS Repository.
Abstract: This study revealed that membrane fouling rate increased with increasing soluble microbial products (SMP) and extracellular polymeric substances (EPS) concentrations, in which both SMP and EPS concentrations increased with decreasing MCRT. Accumulation of carbohydrates rather than proteins in the mixed liquor supernatant was found to decrease with increasing MCRT. Image analysis of the fouled membrane showed that biofilm formation was the possible cause of membrane fouling. It was also found that high aeration rate of 10 L air/min was able to minimize membrane fouling as compared to the lower aeration rate of 5 and 2.5 L air/min. However at an aeration rate of 10 L air/min, the high DO concentration present in the recycle mixed liquor deteriorated the TN removal efficiency when operating at a recycle ratio of more than 3. A lower aeration rate of 5 L air/min saw an improvement in TN removal efficiency; 63, 80, 84 and 89% for R of 1, 3, 5 and 10, respectively. Further decrease in aeration rate to 2.5 L air/min did not show any significant improvement in the TN removal efficiency.
URI: http://scholarbank.nus.edu.sg/handle/10635/13154
Appears in Collections:Ph.D Theses (Open)

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3-Introduction.pdf115.33 kBAdobe PDF

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4-LitReview.pdf320.16 kBAdobe PDF

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5-Methods.pdf2.68 MBAdobe PDF

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6-Results.pdf2.16 MBAdobe PDF

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7-Conclusions.pdf55.32 kBAdobe PDF

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8-References.pdf132.23 kBAdobe PDF

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