期刊
BIORESOURCE TECHNOLOGY
卷 136, 期 -, 页码 654-663出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2013.03.007
关键词
Waste activated sludge (WAS); Dewaterability; Electrolysis; Extracellular polymeric substances (EPS); Ultraviolet visible (UV-Vis) spectra
资金
- Science and Technology Commission of Shanghai Municipality [08 DZ 1202802, 09 DZ 1204105, 09 DZ 2251700, 11DZ0510200]
- China Scholarship Council (CSC)
- Fundamental Research Funds for the Central Universities [0400219152]
- National Natural Science Foundation of China [51278350]
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. (C) 2013 Elsevier Ltd. All rights reserved.
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