Rotting settlers

Settling tanks are used for the treatment of raw domestic sewage to a level suitable for further aerobic treatment in the ground. In the settling tank, a process of separation and fermentation of the sludge occurs with the help of anaerobic bacteria. The contaminants are separated into solid parts, which settle at the bottom of the tank, a light substance that floats on the surface of the sewage in the form of a scum, and substances that dissolve in water. Additionally, a special filter is involved in the treatment process, which is designed to filter the liquid that flows from the settling tank to the distribution chamber. The sizes of the settling tanks are specified in the table.