Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6484121 | Biochemical Engineering Journal | 2013 | 6 Pages |
Abstract
Influence of extracellular polymeric substances (EPS) on rheological properties of activated sludge (AS) was conducted by comparing properties of AS before and after EPS extraction at a TSS of 54 g/L. Slime, loosely and tightly bound EPS (LB- and TB-EPS) were stratified by centrifugation and ultrasound method. The results showed that sludge after LB-EPS extraction produced a higher hysteresis loop area (Hla), limiting viscosity (ηâ), yield stress (Ïy), energy of cohesion of network sludge (Ec), and storage modulus (Gâ²0), than three other sludge samples, indicating that sludge with TB-EPS exhibited stronger network structure. Strain amplitude sweep (SAS) and frequency sweep (FS) tests revealed that AS before and after EPS extraction produced a gel-like structure in the linear viscoelastic (LVE) domain. TB-EPS appeared to have a positive effect on the gel-like structure of AS.
Keywords
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Bioengineering
Authors
Dongqin Yuan, Yili Wang,