| 摘要 |
<p>PURPOSE:To facilitate maintenance control, by forming an aerobic zone and an anaerobic zone in a treatment tank to perform BOD treatment, nitration treatment and denitrification treatment of waste water. CONSTITUTION:An inner cylindrical pipe 22 is arranged to the upper part in a treatment tank 21 and air is blown in said pipe 22 in a bubble from by a blower 24. The upper part in the treatment tank 21 is packed with floatable carriers 25 comprising plastic to fluidize said carriers 25. The lower part in the treatment tank 21 is packed with sedimenting carriers 30 such as sand to fluidize said carriers 30 in the lower part of the tank 21. When raw water is introduced into the treatment tank 21 from the lower part thereof, said raw water passes through the lower anaerobic zone to enter the upper aerobic zone where BOD in waste water is decomposed and removed by BOD oxidizing bacteria in aerobic bacteria adhered to and propagated on the surfaces of the floatable carriers 25. Further, NH4-N in waste water is oxidized to NO3-N by the action of nitriding bacteria in aerobic bacteria.</p> |
