Influence of COD:N ratio on sludge properties and their role in membrane fouling of a submerged membrane bioreactor

被引：95
作者：
Hao, L. [1 ]
Liss, S. N. [2 ,3 ]
Liao, B. Q. [1 ]
机构：
[1] Lakehead Univ, Dept Chem Engn, 955 Oliver Rd, Thunder Bay, ON P7B 5E1, Canada
[2] Queens Univ, Sch Environm Studies, Kingston, ON K7L 3N6, Canada
[3] Queens Univ, Dept Chem Engn, Kingston, ON K7L 3N6, Canada
来源：
WATER RESEARCH | 2016年 / 89卷
基金：
加拿大自然科学与工程研究理事会;
关键词：
COD:N; Membrane bioreactor; Membrane fouling; Industrial wastewater; Extracellular polymeric substances; Sludge properties; EXTRACELLULAR POLYMERIC SUBSTANCES; WASTE-WATER TREATMENT; ACTIVATED-SLUDGE; NITROGEN RATIO; FILAMENTOUS BACTERIA; ORGANIC-MATTER; MBR; FILTRATION; GROWTH; CELLS;
D O I：
10.1016/j.watres.2015.11.052
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
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.
引用
收藏
页码：132 / 141
页数：10
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