A pilot scale swimming-bed biofilm reactor used for domestic wastewater treatment under low temperature conditions
- Received Date: 07/10/2009
- Accepted Date: 10/06/2009
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Key words:
- swimming-bed biofilm reactor /
- sewage treatment /
- low temperature /
- pilot study
Abstract: The pilot study of a novel biofilm reactor，swimming-bed biofilm reactor （SBR）with working volume of 4.8 m3, was conducted for the treatment of treated water of domestic wastewater at low temperature of 5～10℃ in the north areas of China during winter and spring. The removal rates of COD, NH+4-N and suspended particles of treated water were used as the investigation targets in pilot study. The results showed that the operating conditions of SBR, including a HRT of 4.8 h, an air/water ratio of 4∶1 with an air flow rate of 4 m3/h and a water flow rate of 1.0 m3/h, and an intermittent aeration operation with 4 h intervals between 4 h aerations at 10℃, were obtained. The removal rates of COD and NH+4-N of domestic wastewater were about 30% and 50%, respectively. However, the removal rate of suspended particles was lower. The pilot study results indicated that SBR could be applied to the removals of COD and NH+4-N of water at low temperatures in the north areas of China in winter and spring.
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