曝气生物滤池反冲洗的特性

试验根据曝气生物滤池区别于普通给水滤池的特点,从反冲洗方式、反冲滤床形状等方面进行深入地对照研究.结果发现在相同的反冲条件下,在反冲方式的对照中,脉冲反冲洗具有远大于气水连续反冲洗的效能;在滤池池型的选择中,扩展流池型曝气生物滤池较均匀流池型曝气生物滤池易于洗净和生物滤层的恢复.最后优化组合了反冲方式和滤池池型,即脉冲反冲方式与扩展流曝气生物滤池组合后,对应既定的运行工况,确定了最佳的反冲运行参数为:气冲强度8～10L/(s·m² )、水冲强度2～4 L/(s·m² )、反冲时间5min.

Characteristics of Aerobic Biofilter Backwash

Periodic backwash is the vital stage to keep up the aerobic biofilter's performance. Under the same backwash conditions, a thorough study was done to review the influences on the performances of backwash in such aspects as backwash regimes, biofilter shapes. The experimental results show that the impulse backwash regime was superior to continuous backwash in the backwash performance and that the expansive flow aerobic biofilter was superior to the uniform flow aerobic biofilter in the performances of both backwash process and filter bed recovery. Then the optimal combination of the two factors i.e. the combination of impulse backwash mode and expansive flow filter was determined. Under the fixed filtration conditions, the appropriate impulse backwash parameters of expansive aerobic biofilter were determined as follows: the backwash air-flow intensity was 8-10 L/(s.m2), the backwash water-flow intensity was 2-4 L/(s.m2), and the backwash duration was 5 min.