Modelling based design of a pilot-scale membrane bioreactor for combined nutrient removal from domestic wastewater

Tiranuntakul, M., Schneider, P.A., Jegatheesan, V., and Fracchia, H.L. (2006) Modelling based design of a pilot-scale membrane bioreactor for combined nutrient removal from domestic wastewater. In: Proceedings of the World Water Congress. From: 5th Biennial World Water Congress, 10-14 September 2006, Beijing, China.

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A three stage-treatment of domestic wastewater including anaerobic, anoxic and aerobic phases is employed in this study while a clarifier unit is replaced with a submerged membrane in the aerobic unit. The effects of operational parameters on the performance of a pilot scale submerged membrane bioreactor (SMBR) namely hydraulic retention time (HRT), ratio of return activated sludge (QRS), ratio of internal recycle (QIR), solid retention time (SRT) and dissolved oxygen (DO) are evaluated by simulations, using a hybrid model composed of TUDP model, oxygen transfer model, biofouling model due to extra-cellular polymeric substances (EPS) and turbulent shear model. The results showed that anaerobic HRT of 3 hours, anoxic HRT of 6 hours, QRS of 20% and QIR of 300 % are satisfactory in obtaining a high removal efficiency (>90%) of COD, NH4-N, P04-P as well as a less sludge production. An increase of sludge production causes an increase in EPS, which fouls the membrane surface and increase the cleaning cycle of membrane. Operation of 5MBR system at 2 mg/I of DO and 30 days of SRT can extend the membrane cleaning cycle dramatically. The membrane cleaning cycle however is strongly dependent on the initial and terminal specific fluxes and displays inverse power relationships to those fluxes.

Item ID: 4331
Item Type: Conference Item (Research - E1)
Keywords: submerged membrane bioreactor; TUDP model; EPS biofouling model; shear turbulent model; oxygen transfer model
Date Deposited: 01 Nov 2009 23:22
FoR Codes: 09 ENGINEERING > 0907 Environmental Engineering > 090701 Environmental Engineering Design @ 50%
09 ENGINEERING > 0907 Environmental Engineering > 090702 Environmental Engineering Modelling @ 50%
SEO Codes: 96 ENVIRONMENT > 9609 Land and Water Management > 960999 Land and Water Management of Environments not elsewhere classified @ 100%
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