TY - JOUR
T1 - Synergetic pretreatment of waste activated sludge by Fe(II)-activated persulfate oxidation under mild temperature for enhanced dewaterability
AU - Zhen, Guangyin
AU - Lu, Xueqin
AU - Wang, Baoying
AU - Zhao, Youcai
AU - Chai, Xiaoli
AU - Niu, Dongjie
AU - Zhao, Aihua
AU - Li, Yuyou
AU - Song, Yu
AU - Cao, Xianyan
N1 - Funding Information:
The authors wish to thank the Science and Technology Commission of Shanghai Municipality ( No. 08 DZ 1202802 , 09 DZ 1204105 and 09 DZ 2251700 ) and the Fundamental Research Funds for the Central Universities ( No. 0400219152 ) for the partial support of this study.
Copyright:
Copyright 2013 Elsevier B.V., All rights reserved.
PY - 2012/11
Y1 - 2012/11
N2 - The potential benefits of Fe(II)-activated persulfate (S2O82-) oxidation under mild temperature in enhancing the dewaterability of waste activated sludge were investigated. Capillary suction time (CST) was used to characterize sludge dewatering. Zeta potential, particle size distribution, three-dimensional excitation-emission matrix (EEM) fluorescence spectroscopy, fourier-transformed infrared (FT-IR) spectroscopy and scanning electronic microscopy (SEM) were employed to explore influencing mechanisms. The results indicated that the dewaterability was deteriorated with single thermal treatment, but significantly enhanced in the presence of Fe(II)-S2O82- oxidation and further advanced together with thermal treatment. EEM and FT-IR analysis indicated that combined thermal and Fe(II)-S2O82- oxidation pretreatment led to degrading of tyrosine and tryptophan protein-like substances in extracellular polymeric substances (EPS) and cleavage of linkages in polymeric backbone. SEM images further revealed the rupture of sludge flocs at the colloidal scale, which contributed to the release of EPS-bound water and interstitial water trapped between flocs, and subsequent enhanced dewaterability.
AB - The potential benefits of Fe(II)-activated persulfate (S2O82-) oxidation under mild temperature in enhancing the dewaterability of waste activated sludge were investigated. Capillary suction time (CST) was used to characterize sludge dewatering. Zeta potential, particle size distribution, three-dimensional excitation-emission matrix (EEM) fluorescence spectroscopy, fourier-transformed infrared (FT-IR) spectroscopy and scanning electronic microscopy (SEM) were employed to explore influencing mechanisms. The results indicated that the dewaterability was deteriorated with single thermal treatment, but significantly enhanced in the presence of Fe(II)-S2O82- oxidation and further advanced together with thermal treatment. EEM and FT-IR analysis indicated that combined thermal and Fe(II)-S2O82- oxidation pretreatment led to degrading of tyrosine and tryptophan protein-like substances in extracellular polymeric substances (EPS) and cleavage of linkages in polymeric backbone. SEM images further revealed the rupture of sludge flocs at the colloidal scale, which contributed to the release of EPS-bound water and interstitial water trapped between flocs, and subsequent enhanced dewaterability.
KW - Dewaterability
KW - Excitation-emission matrix (EEM)
KW - Extracellular polymeric substances (EPS)
KW - Fe(II)-SO oxidation
KW - Waste activated sludge
UR - http://www.scopus.com/inward/record.url?scp=84866177355&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84866177355&partnerID=8YFLogxK
U2 - 10.1016/j.biortech.2012.08.039
DO - 10.1016/j.biortech.2012.08.039
M3 - Article
C2 - 22989633
AN - SCOPUS:84866177355
VL - 124
SP - 29
EP - 36
JO - Bioresource Technology
JF - Bioresource Technology
SN - 0960-8524
ER -