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Title: Treatment of paper mill effluent using an anaerobic/aerobic hybrid side-stream membrane bioreactor
Authors: Sheldon, MS 
Zeelie, P 
Edwards, W 
Keywords: Membrane bioreactor (MBR);Anaerobic/aerobic hybrid side-stream;Chemical oxygen demand (COD);Expanded granular sludge bed (EGSB)
Issue Date: 2012
Publisher: IWA Publishing
Source: Water Science and Technology, 65(7):1265-1272, 2012
Abstract: This paper presents the design and operational performance data of an anaerobic/aerobic hybrid side-stream Membrane Bioreactor (MBR) process for treating paper mill effluent operated over a 6 month period. The paper mill effluent stream was characterized by a chemical oxygen demand (COD) range of between 1,600 and 4,400 mg/L and an average BOD of 2,400 mg/L. Despite large fluctuations in COD feed concentration, stable process performance was achieved. The anaerobic Expanded Granular Sludge Bed (EGSB) pre-treatment step effectively lowered the organic loading by 65 to 85%, thus lowering the MBR COD feed concentration to consistently below 750 mg/L. The overall MBR COD removal was consistent at an average of 96%, regardless of the effluent COD or changes in the hydraulic retention time (HRT) and organic loading rate (OLR). Combining a high-rate anaerobic pre-treatment EGSB with a Modified Ludzackā€“Ettinger (MLE) MBR process configuration produced a high quality permeate. Preliminary NF and RO results indicated an overall COD removal of around 97 and 98%, respectively.
ISSN: 0273-1223
Appears in Collections:Eng - Journal articles (DHET subsidised)

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