SEPTIC TANK OF HARDLY DISPOSABLE SEWAGE OF NIGHT SOIL

摘要

PURPOSE:To perform a purifying treatment surely and quickly by subjecting night soil sewage to an anaerobic treatment then controlling the pH thereof with an alkali, diluting the same and subjecting the sewage to an aerobic treatment. CONSTITUTION:Night soil sewage is admitted through an inflow port 2 and an inflow pipe 2A into a septic tank 3 from the deep position thereof, and is transferred stepwise through the tank 3, so that the sewage is decomposed anaerobically. The night soil sewage flowing out from the tank 3 is introduced into a filter device 4, where the pH thereof is increased to about 4-7 by an alkali, for example, limestone; thereafter, the sewage is diluted properly in a water feeder 5 so as to have optimum BOD load. After the sewage is introduced into an aerating chamber 6 and is treated by aerobic bacteria, the suspended solids such as stripped sludge are settled in a settling chamber 7. The treated water is disinfected in a disinfecting chamber 8, and is discharged to the outside through a discharge port 9. Thus, the saccharides and other chemical components in the night soil are thoroughly disposed.