| Nutrient Removal Using Fermented Organic Acids
Derived from the Primary Sludge in the Intermittent
Aeration Activated Sludge Process |
| Seung-Yeon Weon1, Sang-Il Lee1, and Chan-Won Lee2† |
1Department of Environmental Engineering, Chungbuk National University, Cheongju 361-763, Korea
2Department of Urban Environmental Engineering, Kyungnam University, Changwon 631-701, Korea |
Corresponding Author:
Chan-Won Lee ,Tel: +82-55-2492247, Fax: +82-505-999-2131, Email: water@kyungnam.ac.kr
|
|
Received: July 15, 2010; Accepted: November 25, 2011. |
|
|
Share : 
|
| ABSTRACT |
|
The two-stage intermittent aeration activated sludge process (IAP) and dynamic-flow intermittent aeration activated sludge process
(DFP) were investigated for the nutrient removal of domestic wastewater. Three sets of IAP and one set of DFP were operated. The fermented
settled sludge taken from the primary settling tank was added to two IAP and one DFP as an external electron donor, with one
IAP, in which an external carbon source was not added, as a control. All the systems were operated at a sludge retention time of 20 days
and a hydraulic retention time of 12 hr. A Higher denitrification rate was observed with the fermented settled sludge for the denitrification
compared to the process without the addition of the organic source. The result indicates that the fermented acid from the primary
domestic sludge has been proved to be an excellent electron donor for denitrification and biological phosphorus removal with IAP and
DFP in treating relatively low C/N ratio(Carbon / Nitrogen ratio) wastewater. Phosphate accumulating organisms have a capability of
competing with denitrifiers in the presence of volatile organic acids under anoxic conditions. |
| Keywords:
Denitrification | Dynamic-flow intermittent aeration | Electron donor | Fermented acids | Phosphate accumulating organisms |
Two-stage intermittent aeration |
|
|
|
PDF Links
Full text via DOI
Download Citation 
