TY - JOUR
T1 - Impact of sludge cation distribution pattern on its filterability in membrane bioreactor
AU - Zhang, Haifeng
AU - Wang, Zhongping
AU - Zhang, Lanhe
AU - Song, Lianfa
N1 - Funding Information:
The authors wish to thank the Jilin Province Scientific and Technological Planning Project of China (Nos. 20120404 and 20130206061GX ), the Science and Technology Development Program of Jilin city in China (Nos. 20106306 and 201232403 ) and Chinese Society of Electrical Engineering for Power Technology Youth Innovation Project (No. 2009NEDU ) for the partial support of this study.
PY - 2014/11
Y1 - 2014/11
N2 - The distributions of cations of various valences (Na+, Ca2+ and Fe3+) in the outer layers of extracellular polymeric substances (EPSs) to pellet have a significant impact on the stratification structure of polysaccharides (PS) or proteins (PN) in activated sludge. Comparison with the control showed that the monovalent Na+ reduced flocculability slightly (about 9.75%), whereas Ca2+ and Fe3+ increased flocculability significantly. The modified fouling index (MFI) had a significant correlation with PN in the supernatant (rp=0.8593), slime (rp=0.7218) and loosely bound EPS (LB, rp=0.8012). However, it had a moderate correlation with PS in supernatant (rp=0.5842), and weak correlation to slime (rp=0.3785) or LB (rp=0.3219). There was an ignored correlation with PN or PS in the tightly bound EPS (TB) or pellet. The lower amount of PN or PS in the supernatant would have positive impact on improving the activated sludge filterability.
AB - The distributions of cations of various valences (Na+, Ca2+ and Fe3+) in the outer layers of extracellular polymeric substances (EPSs) to pellet have a significant impact on the stratification structure of polysaccharides (PS) or proteins (PN) in activated sludge. Comparison with the control showed that the monovalent Na+ reduced flocculability slightly (about 9.75%), whereas Ca2+ and Fe3+ increased flocculability significantly. The modified fouling index (MFI) had a significant correlation with PN in the supernatant (rp=0.8593), slime (rp=0.7218) and loosely bound EPS (LB, rp=0.8012). However, it had a moderate correlation with PS in supernatant (rp=0.5842), and weak correlation to slime (rp=0.3785) or LB (rp=0.3219). There was an ignored correlation with PN or PS in the tightly bound EPS (TB) or pellet. The lower amount of PN or PS in the supernatant would have positive impact on improving the activated sludge filterability.
KW - Bioflocculation
KW - Extracellular polymeric substances
KW - Filterability
KW - Membrane bioreactor
KW - Modified fouling index
UR - http://www.scopus.com/inward/record.url?scp=84906778076&partnerID=8YFLogxK
U2 - 10.1016/j.biortech.2014.07.084
DO - 10.1016/j.biortech.2014.07.084
M3 - Article
C2 - 25181695
AN - SCOPUS:84906778076
SN - 0960-8524
VL - 171
SP - 16
EP - 21
JO - Bioresource Technology
JF - Bioresource Technology
ER -