Please use this identifier to cite or link to this item: https://doi.org/10.2175/106143005X41753
Title: Specific resistance to filtration of biomass from membrane bioreactor reactor and activated sludge: Effects of exocellular polymeric substance and dispersed microorganisms
Authors: Ng, H.Y. 
Hermanowicz, S.W.
Keywords: Completely mixed activated sludge
Dewaterability
Dispersed microorganisms
Exocellular polymeric substances
High F/M
Membrane bioreactor
Short solids retention times
Specific resistance to filtration
Issue Date: Mar-2005
Citation: Ng, H.Y., Hermanowicz, S.W. (2005-03). Specific resistance to filtration of biomass from membrane bioreactor reactor and activated sludge: Effects of exocellular polymeric substance and dispersed microorganisms. Water Environment Research 77 (2) : 187-192. ScholarBank@NUS Repository. https://doi.org/10.2175/106143005X41753
Abstract: This study investigates the effect of dispersed microorganisms and exocellular polymeric substances on biomass dewaterability. Specific resistance to filtration (SRF) was measured for biomass from a membrane bioreactor and a completely mixed activated sludge system. Both laboratory-scale reactors were fed with synthetic wastewater and operated at a high food-to-microorganism ratio (F/M) (1 to 11 kilograms chemical oxygen demand per kilogram mixed liquor volatile suspended solids per day [kgCOD/(kg MLVSS·d)]) and short solids retention times (0.25 to 5 d). The SRF values were affected by strong interactions of three parameters: (1) the mixed liquor suspended solids concentration, (2) the amount of dispersed microorganisms, and (3) the exocellular polymeric substances (EPS) concentration. At F/M smaller than 2 kg COD/(kg MLSS·d) and mixed liquor suspended solids (MLSS) concentration higher than 2000 mg/L, increasing amount of dispersed microorganisms in the biomass yielded higher SRF values. However, at high F/M (>5 kg COD/kg MLSS·d) and low MLSS concentrations (<600 mg/L), lower EPS concentrations resulted in slightly smaller SRF values, even though the amount of dispersed microorganisms in the biomass was much higher. Thus, at low MLSS concentrations, EPS concentrations rather than the amount of dispersed microorganisms tend to control SRF.
Source Title: Water Environment Research
URI: http://scholarbank.nus.edu.sg/handle/10635/66184
ISSN: 10614303
DOI: 10.2175/106143005X41753
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