Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.watres.2010.08.035
Title: Submerged anaerobic membrane bioreactor for low-strength wastewater treatment: Effect of HRT and SRT on treatment performance and membrane fouling
Authors: Huang, Z. 
Ong, S.L. 
Ng, H.Y.
Keywords: Anaerobic membrane bioreactor
Biogas production
Extracellular polymeric substances
Low-strength wastewater
Membrane fouling
Soluble microbial products
Issue Date: Jan-2011
Citation: Huang, Z., Ong, S.L., Ng, H.Y. (2011-01). Submerged anaerobic membrane bioreactor for low-strength wastewater treatment: Effect of HRT and SRT on treatment performance and membrane fouling. Water Research 45 (2) : 705-713. ScholarBank@NUS Repository. https://doi.org/10.1016/j.watres.2010.08.035
Abstract: Three 6-L submerged anaerobic membrane bioreactors (SAnMBRs) with solids retention times (SRTs) of 30, 60 and infinite days were setup for treating synthetic low-strength wastewater at hydraulic retention times (HRTs) of 12, 10 and 8 h. Total COD removal efficiencies higher than 97% were achieved at all operating conditions. Maximum biogas production rate was 0.056 L CH4/g MLVSS d at an infinite SRT. A shorter HRT or longer SRT increased biogas production due to increased organic loading rate or enhanced dominancy of methanogenics. A decrease in HRT enhanced growth of biomass and accumulation of soluble microbial products (SMP), which accelerated membrane fouling. A drop in carbohydrate to protein ratio also inversely affected fouling. At 12-h HRT, the effect of SRT on biomass concentration in SAnMBRs was negligible and membrane fouling was controlled by variant surface modification due to different SMP compositions, i.e., higher carbohydrate and protein concentrations in SMP at longer SRT resulted in higher membrane fouling rate. At 8 and 10-h HRTs, infinite SRT in SAnMBR caused highest MLSS and SMP concentrations, which sped up particle deposition and biocake/biofilm development. At longer SRT, lower extracellular polymeric substances reduced flocculation of particulates and particle sizes, further aggravated membrane fouling. © 2010 Elsevier Ltd.
Source Title: Water Research
URI: http://scholarbank.nus.edu.sg/handle/10635/91229
ISSN: 00431354
DOI: 10.1016/j.watres.2010.08.035
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