Size-dependent anaerobic digestion rates of flocculated activated sludge : Role of intrafloc mass transfer resistance
Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review
Author(s)
Detail(s)
| Original language | English |
|---|---|
| Pages (from-to) | 239-244 |
| Journal / Publication | Journal of Environmental Management |
| Volume | 76 |
| Issue number | 3 |
| Publication status | Published - Aug 2005 |
| Externally published | Yes |
Link(s)
Abstract
The anaerobic digestion rate for flocculated sludge has been considered to be lower than that of original sludge, particularly in the later stages of digestion; Chu et al. (2003) attributed this relatively slower rate to the increased mass transfer resistance for reactants through the large flocs after flocculation. This study confirmed that methane production was retarded by flocculation. The structure of the floc was identified with fluorescence in situ hybridization (FISH) and a confocal laser scanning microscope (CLSM) technique. To verify the mass transfer resistance induced by flocculation, microsensors were applied to assess the response of oxygen concentration distribution inside the flocs that are subjected to sudden changes in ambient oxygen levels. Response time for the electrode at a floc's center was five times greater than the response time in original sludge flocs. Although the effective diffusivity of oxygen in the floc increased by 2.3 times after flocculation, the increased size of the flocculated floc was the major contributor to the total mass transfer resistance to oxygen. © 2005 Elsevier Ltd. All rights reserved.
Research Area(s)
- Activated sludge, Anaerobic digestion, CLSM, Mass transfer resistance
Bibliographic Note
Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to lbscholars@cityu.edu.hk.
Citation Format(s)
Size-dependent anaerobic digestion rates of flocculated activated sludge : Role of intrafloc mass transfer resistance. / Chu, C. P.; Tsai, D. G.; Lee, D. J. et al.
In: Journal of Environmental Management, Vol. 76, No. 3, 08.2005, p. 239-244.Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review
