TY - JOUR
T1 - Calcium ion on membrane fouling reduction and bioflocculation promotion in membrane bioreactor at high salt shock
AU - Zhang, Haifeng
AU - Fan, Xue
AU - Wang, Bin
AU - Song, Lianfa
N1 - Funding Information:
The authors wish to thank the National Science Foundation of China (No. 51478093 ), the Jilin Province Scientific and Technological Planning Project of China (Nos. 20120404 & 20130206061GX ).
Publisher Copyright:
© 2015.
PY - 2016/1/1
Y1 - 2016/1/1
N2 - Fouling propensity of activated sludge in membrane bioreactor (MBR) is closely related to the disturbance of a salt shock. In this work, the characteristics of membrane fouling and bioflocculation were compared in two laboratory-scale MBRs (one with calcium addition, MBR-Ca, the other without, MBR-C) with a transient salt shock. Particle size distributions, zeta potential, relative hydrophobicity, modified fouling index, the content of polysaccharides, proteins and calcium ions in different layers of sludge were monitored prior to, during and after the salt shock. Comparison with MBR-C showed that the recovery time and fouling rate of MBR-Ca were reduced by 50% and 34%, respectively. Remarkable variations of sludge properties in terms of bioflocculation, such as larger particle sizes, higher relative hydrophobicity and zeta potential, lower polysaccharides in supernatant, higher proteins/polysaccharides ratio in slime and loose bound extracellular polymeric substances, were observed in MBR-Ca after the salt shock.
AB - Fouling propensity of activated sludge in membrane bioreactor (MBR) is closely related to the disturbance of a salt shock. In this work, the characteristics of membrane fouling and bioflocculation were compared in two laboratory-scale MBRs (one with calcium addition, MBR-Ca, the other without, MBR-C) with a transient salt shock. Particle size distributions, zeta potential, relative hydrophobicity, modified fouling index, the content of polysaccharides, proteins and calcium ions in different layers of sludge were monitored prior to, during and after the salt shock. Comparison with MBR-C showed that the recovery time and fouling rate of MBR-Ca were reduced by 50% and 34%, respectively. Remarkable variations of sludge properties in terms of bioflocculation, such as larger particle sizes, higher relative hydrophobicity and zeta potential, lower polysaccharides in supernatant, higher proteins/polysaccharides ratio in slime and loose bound extracellular polymeric substances, were observed in MBR-Ca after the salt shock.
KW - Bioflocculation
KW - Calcium ion
KW - Membrane bioreactor
KW - Membrane fouling rate
KW - Salt shock
UR - http://www.scopus.com/inward/record.url?scp=84945381538&partnerID=8YFLogxK
U2 - 10.1016/j.biortech.2015.10.080
DO - 10.1016/j.biortech.2015.10.080
M3 - Article
C2 - 26524252
AN - SCOPUS:84945381538
SN - 0960-8524
VL - 200
SP - 535
EP - 540
JO - Bioresource Technology
JF - Bioresource Technology
ER -