Journal
WATER RESEARCH
Volume 89, Issue -, Pages 132-141Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2015.11.052
Keywords
COD:N; Membrane bioreactor; Membrane fouling; Industrial wastewater; Extracellular polymeric substances; Sludge properties
Funding
- Natural Sciences and Engineering Council of Canada (NSERC) [RGPIN-2014-03727]
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The effect of COD:N ratio on sludge properties and their role in membrane fouling were examined using a well-controlled aerobic membrane bioreactor receiving a synthetic high strength wastewater containing glucose. Membrane performance was improved with an increase in the COD/N ratio (100:5-100:1.8) (i.e. reduced N dosage). Surface analysis of sludge by X-ray photoelectron spectroscopy (XPS) indicates significant differences in surface concentrations of elements C, O and N that were observed under different COD/N ratios, implying changes in the composition of extracellular polymeric substances (EPS). Fourier transforth-infrared spectroscopy (FTIR) revealed a unique characteristic peak (C=O bonds) at 1735 cm(-1) under nitrogen limitation conditions. Total EPS decreased with an increase in COD/N ratio, corresponding to a decrease in the proteins (PN) to carbohydrates (CH) ratio in EPS. There were no significant differences in the total soluble microbial products (SMPs) but the ratio of PN/CH in SMPs decreased with an increase in COD/N ratios. The results suggest that EPS and SMP composition and the presence of a small quantity of filamentous microorganisms played an important role in controlling membrane fouling. (C) 2015 Elsevier Ltd. All rights reserved.
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