| Effects of Aerobic and Non-Aerobic Starvation on SBR
Performance When Treating Saline Wastewater |
| Byung-Hyun Moon1, Kyung-Hun Park1, Sang-Soo Kim2, and Cho-Hee Yoon3† |
1Department of Environmental Engineering, Changwon National University, Changwon 641-773, Korea
2Water Environment Research Department, National Institute of Environmental Research, Incheon 404-170, Korea
3Department of Urban Environmental Engineering, Kyungnam University, Changwon 631-701, Korea |
Corresponding Author:
Cho-Hee Yoon ,Tel: +82-55-249-2663, Fax: +82-55-999-2166, Email: chyoon@kyungnam.ac.kr
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Received: July 13, 2012; Accepted: August 2, 2012. |
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| ABSTRACT |
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In this study, the effects of starvation on floc characteristics when treating saline wastewater using a sequencing batch reactor (SBR)
were investigated. The effectiveness over 5 days of starvation for aerobic and non-aerobic strategies for maintaining the physical characteristics
of floc-forming sludge and the recovery period needed to regain the initial pollutant removal efficiency were investigated.
Experiment results revealed that the sludge volume index (SVI) increased and the floc size and fractal dimension decreased after starvation
under both aerobic and non-aerobic conditions. Sludge settleability deteriorated faster under aerobic conditions compared to
non-aerobic conditions. Under non-aerobic conditions, the SBR required less time to return to its initial pollutant removal efficiency
and settleability. Floc size, fractal dimension, and SVI were observed to be fairly correlated with each other. The results demonstrated
that it was better to maintain the sludge under non-aerobic rather than aerobic starvation, because it adapted to, resisted starvation and
had a quicker re-start afterward. |
| Keywords:
Floc characteristics | Fractal dimension | Recovery time | Sequencing batch reactor | Starvation |
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