Reactivation performance of aerobic granules under different storage strategies
- 作者：Dawen Gaoa ; b ; dawengao@gmail.com ; Xiangjuan Yuana ; Hong Lianga
- 关键词：Aerobic granules ; Reactivation ; Storage temperature ; Storage substrate ; Specific oxygen utilization rate (SOUR)
- 刊名：Water Research
- 出版年：2012
- 期刊代码：57_00431354
- 类别：civ
- 出版时间：15 June, 2012
- 卷：46
- 期：10
- 页码：3315-3322
- 文件大小：459 K
摘要
Aerobic granules storage process is complicated and the affective mechanism is not very clear, which is influenced by storage temperature, storage substrate and storage time. The effects of storage temperature (鈭?5聽掳C, 4聽掳C and room temperature) and storage substrate (distilled water and 400聽mg/L glucose solution) on long-term storage and subsequently reactivation performance of aerobic granules were investigated in this study. The results showed that storage temperature had huge impact on the morphology and physical properties and storage substrate had relatively small influence on granules. Granules reactivation was a re-stability process of granules structure, physical properties and microbial communities. Storage at 4聽掳C was more suitable for maintenance of structural integrity and granules long-term stability storage. Granules stored at 鈭?5聽掳C achieved excellent settling ability after reactivation and PN/PS ratio was basically unchanged, which demonstrated that storage at 鈭?5掳Cwas more suitable for the maintenance of the internal microstructure. Aerobic granules under different storage conditions could be reactivated after 10 days operation and the microbial activity (SOUR) could be fully restored. Furthermore granules stored at 4聽掳C obtained the best recovery performance, and granules at room temperature presented the worst restoration performance. In conclusion, no matter what the storage temperature or the storage substrate is, aerobic granules after long-term storage (8 months) could be restored within 10 days and stored granules could be successfully used as bioseed for reactor fast startup.