Biological sewage treatment plant - with three basins used alternately for aeration, settling and outflow

摘要

Plant consists of an aeration stage, a circulation stage and a settling stage without circulation. Three basins are in turn used as inflow and as aeration tanks. When one basin is used as inflow and aeration tank, one of the other two is used as settling and outflow tank and the 3nd either as aeration and/or settling tank.