The effects of SRT, OLR and feed temperature on the performance of membrane bioreactor treating high strength municipal wastewater
The effects, of sludge retention time (SRT), feed temperature (Tf) and organic loading rate (OLR) on submerged membrane bioreactor (SMBR) performance were studied using hollow fibers (nominal pore size 0.4 μm) immersed in an aeration tank. A synthetic wastewater representative of high strength munic...
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my.iium.irep.177112012-02-14T01:46:33Z http://irep.iium.edu.my/17711/ The effects of SRT, OLR and feed temperature on the performance of membrane bioreactor treating high strength municipal wastewater Birima, Ahmed Hussien Megat Mohd Noor, Megat Johari Mohammed , Ahmed Thamer Idris, Azni Muyibi, Suleyman Aremu Nagaoka, H. Abdul Ghani, L.A. TD159 Municipal engineering The effects, of sludge retention time (SRT), feed temperature (Tf) and organic loading rate (OLR) on submerged membrane bioreactor (SMBR) performance were studied using hollow fibers (nominal pore size 0.4 μm) immersed in an aeration tank. A synthetic wastewater representative of high strength municipal wastewater was used in the study. Ten experimental runs were carried out using full factorial design with three factors and three levels (low, medium and high). These levels were 25, 30 and 35 days for SRT, 20, 30 and 40°C for Tf and 1.73, 4.03 and 6.82 kg COD/m3 d for OLR. Variation of OLR, SRT and Tf affected the biomass development significantly. The higher OLR trials resulted in higher MLVSS/MLSS ratio and also higher increasing rate of MLSS (d(MLSS)/ (dt)). For the low level OLR trials MLVSS/MLSS ratio varied between 75.3 and 82.3% and d(MLSS)/(dt) from 87.5 to 297.3 mg/l.d, whereas, for the high OLR trials they varied between 80.4 and 83.7% and 1355.4–2120.1 mg/l.d respectively. For the higher OLR, a higher aeration rate was applied to fulfill the DO demand. Therefore, for the low level OLR trials, the aeration rate and the DO were varied from 6 to 12 m3/m2 membrane area per hour and from 3.7 to 5.7 mg/l, respectively, whilst for the high OLR trials they varied from 6 to 18 m3/m2 membrane area/h and from 0.9 to 4.4 mg/l respectively. The permeate COD and NH3-N under different operating conditions varied from 0 to 32 mg/l, and from 0.004 to 0.856 mg/l, respectively. The interaction effects of SRT and Tf on COD removal efficiency was found to be insignificant. Increasing OLR did not affect COD removal. The optimum removal efficiency of ammonia nitrogen for the low and high strength wastewater was obtained at operating conditions of high SRT and low Tf. The pH increased significantly in the aeration tank and the increase was well correlated with the feed pH (r2 = 0.8336 for low OLR and 0.9106 for high OLR). Desalination Publications 2009-06 Article REM application/pdf en http://irep.iium.edu.my/17711/1/DrAhmad720_Sept09.pdf Birima, Ahmed Hussien and Megat Mohd Noor, Megat Johari and Mohammed , Ahmed Thamer and Idris, Azni and Muyibi, Suleyman Aremu and Nagaoka, H. and Abdul Ghani, L.A. (2009) The effects of SRT, OLR and feed temperature on the performance of membrane bioreactor treating high strength municipal wastewater. Desalination and Water Treatment, 7. pp. 275-284. ISSN 1944-3994 / 1944-3986 http://www.deswater.com |
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TD159 Municipal engineering Birima, Ahmed Hussien Megat Mohd Noor, Megat Johari Mohammed , Ahmed Thamer Idris, Azni Muyibi, Suleyman Aremu Nagaoka, H. Abdul Ghani, L.A. The effects of SRT, OLR and feed temperature on the performance of membrane bioreactor treating high strength municipal wastewater |
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The effects, of sludge retention time (SRT), feed temperature (Tf) and organic loading rate (OLR) on submerged membrane bioreactor (SMBR) performance were studied using hollow fibers (nominal pore size 0.4 μm) immersed in an aeration tank. A synthetic wastewater representative of high strength municipal wastewater was used in the study. Ten experimental runs were carried
out using full factorial design with three factors and three levels (low, medium and high). These levels were 25, 30 and 35 days for SRT, 20, 30 and 40°C for Tf and 1.73, 4.03 and 6.82 kg COD/m3 d for OLR. Variation of OLR, SRT and Tf affected the biomass development significantly. The higher OLR trials resulted in higher MLVSS/MLSS ratio and also higher increasing rate of MLSS (d(MLSS)/ (dt)). For the low level OLR trials MLVSS/MLSS ratio varied between 75.3 and 82.3% and d(MLSS)/(dt) from 87.5 to 297.3 mg/l.d, whereas, for the high OLR trials they varied between 80.4 and 83.7% and 1355.4–2120.1 mg/l.d respectively. For the higher OLR, a higher aeration rate was applied to fulfill the DO demand. Therefore, for the low level OLR trials, the aeration rate and the DO were varied from 6 to 12 m3/m2 membrane area per hour and from 3.7 to 5.7 mg/l, respectively, whilst for the high OLR trials they varied from 6 to 18 m3/m2 membrane area/h and from 0.9 to 4.4 mg/l
respectively. The permeate COD and NH3-N under different operating conditions varied from 0 to 32 mg/l, and from 0.004 to 0.856 mg/l, respectively. The interaction effects of SRT and Tf on COD removal efficiency was found to be insignificant. Increasing OLR did not affect COD removal. The optimum removal efficiency of ammonia nitrogen for the low and high strength wastewater was obtained at operating conditions of high SRT and low Tf. The pH increased significantly in the aeration tank and the increase was well correlated with the feed pH (r2 = 0.8336 for low OLR and 0.9106 for high OLR).
|
format |
Article |
author |
Birima, Ahmed Hussien Megat Mohd Noor, Megat Johari Mohammed , Ahmed Thamer Idris, Azni Muyibi, Suleyman Aremu Nagaoka, H. Abdul Ghani, L.A. |
author_facet |
Birima, Ahmed Hussien Megat Mohd Noor, Megat Johari Mohammed , Ahmed Thamer Idris, Azni Muyibi, Suleyman Aremu Nagaoka, H. Abdul Ghani, L.A. |
author_sort |
Birima, Ahmed Hussien |
title |
The effects of SRT, OLR and feed temperature on the performance of membrane bioreactor treating high strength municipal wastewater |
title_short |
The effects of SRT, OLR and feed temperature on the performance of membrane bioreactor treating high strength municipal wastewater |
title_full |
The effects of SRT, OLR and feed temperature on the performance of membrane bioreactor treating high strength municipal wastewater |
title_fullStr |
The effects of SRT, OLR and feed temperature on the performance of membrane bioreactor treating high strength municipal wastewater |
title_full_unstemmed |
The effects of SRT, OLR and feed temperature on the performance of membrane bioreactor treating high strength municipal wastewater |
title_sort |
effects of srt, olr and feed temperature on the performance of membrane bioreactor treating high strength municipal wastewater |
publisher |
Desalination Publications |
publishDate |
2009 |
url |
http://irep.iium.edu.my/17711/1/DrAhmad720_Sept09.pdf http://irep.iium.edu.my/17711/ http://www.deswater.com |
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1643607339104731136 |
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13.18916 |