浮上式礫間接触酸化処理法による都市河川の直接浄化手法について

抄録

We report here on the data and maintenance collected for purification of urban river water by a by-pass flow biofilm treatment plant in the past two years.
Biofilm treatment plant improved on the how to flow. It became clear that removal ratio in BOD, and SS were approximately 42% and 61%, respectively. The strong relation was observed between removal ratio and hydraulic retention time for BOD, whereas did not find any difference from SS.
Removal ratio of BOD, for example, reached a maximum at about 70-80 minutes hydraulic retention time. The suspension of treatment facility, automatically, was caused at a flood stage or unusual turbidity.
It became clear that unusual number of times was 66 during two years, unusual water level was 20 times greater than unusual water quality.