TY - JOUR
T1 - Sludge rheological and physiological characteristics in a pilot-scale submerged membrane bioreactor
AU - Wu, Zhichao
AU - Wang, Zhiwei
AU - Zhou, Zhen
AU - Yu, Guoping
AU - Gu, Guowei
PY - 2007/6/25
Y1 - 2007/6/25
N2 - Rheological and physiological characteristics of sludge in a submerged membrane bioreactor (MBR) were studied in order to classify their effects on filtration properties and membrane fouling. Viscosity, mixed liquor suspended solids (MLSS), extracellular polymer substances (EPS), soluble chemical oxygen demand (SCOD), dewaterability in terms of capillary suction time (CST), proteins and carbohydrates in the mixed liquor and their correlations with membrane fouling were investigated during a long-term performance. Statistical analysis was employed to specify the influence of temperature, viscosity, MLSS, EPS, CST, SCOD, proteins and carbohydrates in the mixed liquor on membrane fouling. It was found that high MLSS concentration with a high apparent viscosity not only changed rheological characteristics of the mixed liquor, but also affected oxygen transfer coefficient in the submerged MBR. Among all these variables, viscosity, MLSS, EPS, CST, SCOD, carbohydrates and proteins in the mixed liquor were found to have positive correlations with membrane fouling. CST had the greatest impact on membrane fouling, followed by SCOD, carbohydrates, EPS, proteins, apparent viscosity and MLSS, respectively. Test results demonstrated that temperature had negative correlations with membrane fouling rate.
AB - Rheological and physiological characteristics of sludge in a submerged membrane bioreactor (MBR) were studied in order to classify their effects on filtration properties and membrane fouling. Viscosity, mixed liquor suspended solids (MLSS), extracellular polymer substances (EPS), soluble chemical oxygen demand (SCOD), dewaterability in terms of capillary suction time (CST), proteins and carbohydrates in the mixed liquor and their correlations with membrane fouling were investigated during a long-term performance. Statistical analysis was employed to specify the influence of temperature, viscosity, MLSS, EPS, CST, SCOD, proteins and carbohydrates in the mixed liquor on membrane fouling. It was found that high MLSS concentration with a high apparent viscosity not only changed rheological characteristics of the mixed liquor, but also affected oxygen transfer coefficient in the submerged MBR. Among all these variables, viscosity, MLSS, EPS, CST, SCOD, carbohydrates and proteins in the mixed liquor were found to have positive correlations with membrane fouling. CST had the greatest impact on membrane fouling, followed by SCOD, carbohydrates, EPS, proteins, apparent viscosity and MLSS, respectively. Test results demonstrated that temperature had negative correlations with membrane fouling rate.
KW - Membrane fouling
KW - Oxygen transfer rate
KW - Sludge characteristics
KW - Submerged membrane bioreactor
UR - https://www.scopus.com/pages/publications/34249827552
U2 - 10.1016/j.desal.2006.11.005
DO - 10.1016/j.desal.2006.11.005
M3 - 文章
AN - SCOPUS:34249827552
SN - 0011-9164
VL - 212
SP - 152
EP - 164
JO - Desalination
JF - Desalination
IS - 1-3
ER -