Method and apparatus for sewage treatment

Details Method and apparatus for sewage treatment Method and apparatus for sewage treatment

C - Chemistry, Metallurgy

02

F

C02F 3/28 (2006.01) C02F 3/06 (2006.01) C02F 3/26 (2006.01)

Patent

CA 2159053

A method is disclosed for sewage treatment, in particular for municipal sewage. The method has a mechanical purification stage (11, 40), a first biological purification stage (12, 41) and a second biological purification stage (13, 42). The second biological purification stage (13, 42) is a biological filter system, which has a filter stage for nitrification (20, 47) and a filter stage for denitrification (21, 48) connected downstream of the first mentioned stage. The filter stages have at least one biological filter (70). According to the invention, in the first biological purification stage (12, 41), the carbon load and in addition at most the nitrogen load occurring on a 24-hour average (nitrogen impact coefficient fN = 1. 0) at the measurement temperature is reduced. In the second biological purification stage (13, 42), the nitrogen loads that exceed this, an in particular the daily peaks (fN > 1.0), are reduced to a predeterminable extent, even at low temperatures (< 12°C). A sewage treatment plant for carrying out the method is also disclosed and claimed.

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