LOADING AND REMOVAL OF PAHS IN A SEWAGE TREATMENT PLANT IN A SEPARATE SEWER AREA

Abstract

 The loading and removal of PAHs were measured and estimated in a sewage treatment plant in a suburban, separate sewer area in Japan. The inlet 16PAHs concentration was 218 ng L^-1 , whereas the discharges concentration was 42.9 ng L^-1 . No clear diurnal and weekly fluctuation was observed. For long-term changes, fluctuation continuing more than a week was observed for PAHs concentration. The PAHs were decomposed or vaporized in the treatment plant in a half, and the rest is discharged into the outlet or excess sludge evenly. The level of measured inflow concentration and loading were considered to be in the lowest among other researches. The overall loading of PAHs from sewerage in the separate sewer area to the water environment was considered to be lower.