TY - JOUR
T1 - Innovative combination of electrolysis and Fe(II)-activated persulfate oxidation for improving the dewaterability of waste activated sludge
AU - Zhen, Guang Yin
AU - Lu, Xue Qin
AU - Li, Yu You
AU - Zhao, You Cai
N1 - Funding Information:
The authors wish to thank the Science and Technology Commission of Shanghai Municipality (Nos. 08 DZ 1202802 , 09 DZ 1204105 , 09 DZ 2251700 and 11DZ0510200 ), China Scholarship Council (CSC), the Fundamental Research Funds for the Central Universities (No. 0400219152 ) and the National Natural Science Foundation of China (No. 51278350 ) for the partial support of this study.
PY - 2013/5
Y1 - 2013/5
N2 - The feasibility of electrolysis integrated with Fe(II)-activated persulfate (S2O82-) oxidation to improve waste activated sludge (WAS) dewaterability was evaluated. The physicochemical properties (sludge volume (SV), total suspended solids (TSS) and volatile suspended solids (VSS)) and extracellular polymeric substances (EPS), including slime EPS, loosely bound EPS (LB-EPS) and tightly bound EPS (TB-EPS) were characterized to identify their exact roles in sludge dewatering. While dewaterability negatively corresponded to LB-EPS, TB-EPS, protein (PN) and polysaccharide (PS) in LB-EPS and TB-EPS, it was independent of SV, TSS, VSS, slime EPS and PN/PS. Further study through scanning electron microscope (SEM) verified the entrapment of bacterial cells by TB-EPS, protecting them against electrolysis disruption. Comparatively, electrolysis integrated with S2O82-/Fe(II) oxidation was able to effectively disrupt the protective barrier and crack the entrapped cells, releasing the water inside EPS and cells. Therefore, the destruction of both TB-EPS and cells is the fundamental reason for the enhanced dewaterability.
AB - The feasibility of electrolysis integrated with Fe(II)-activated persulfate (S2O82-) oxidation to improve waste activated sludge (WAS) dewaterability was evaluated. The physicochemical properties (sludge volume (SV), total suspended solids (TSS) and volatile suspended solids (VSS)) and extracellular polymeric substances (EPS), including slime EPS, loosely bound EPS (LB-EPS) and tightly bound EPS (TB-EPS) were characterized to identify their exact roles in sludge dewatering. While dewaterability negatively corresponded to LB-EPS, TB-EPS, protein (PN) and polysaccharide (PS) in LB-EPS and TB-EPS, it was independent of SV, TSS, VSS, slime EPS and PN/PS. Further study through scanning electron microscope (SEM) verified the entrapment of bacterial cells by TB-EPS, protecting them against electrolysis disruption. Comparatively, electrolysis integrated with S2O82-/Fe(II) oxidation was able to effectively disrupt the protective barrier and crack the entrapped cells, releasing the water inside EPS and cells. Therefore, the destruction of both TB-EPS and cells is the fundamental reason for the enhanced dewaterability.
KW - Dewaterability
KW - Electrolysis
KW - Extracellular polymeric substances (EPS)
KW - Ultraviolet visible (UV-Vis) spectra
KW - Waste activated sludge (WAS)
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U2 - 10.1016/j.biortech.2013.03.007
DO - 10.1016/j.biortech.2013.03.007
M3 - Article
C2 - 23570713
AN - SCOPUS:84876437615
VL - 136
SP - 654
EP - 663
JO - Agricultural Wastes
JF - Agricultural Wastes
SN - 0960-8524
ER -
