SINGLE TANK NITRATION DENITRIFICATION METHOD OF RAW SEWAGE SYSTEM SEWAGE

摘要

PURPOSE:To simply perform the nitration treatment and denitrification treatment of raw sewage system sewage, by using a single tank that is divided into a central range, an intermediate range and a surrounding range by means of partition plates and aeration means are mounted to the lower portions of the central range and the intermediate range. CONSTITUTION:Raw sewage system sewage is fed to a lower portion of a central range 3 and an upper portion of a surrounding range 5 of a treatment tank 1 through a central feed pipe 10a and a surrounding feed pipe 10b from a pipe 10, and the sewage is aerated by means of aeration devices 6, 7 mounted to the lower portions of the central range 3 and an intermediate range 4 while sludge returned is introduced into the central range from a pipe 9. The sewage to be treated is fluidized in the arrow head directions in the figure, nitration treated at the lower portions of the intermediate range and the central range and denitrification treated at the central range. 8 is a pump for promoting the fluidity of liquid, and 12 a chemicals feed pipe for adjusting pH in the tank. Water treated is discharged from a pipe 11.