sedimentation chamber

The first is the sedimentation chamber, which removes floatables and heavy sediments.

The sedimentation chamber can have permanent water or can be designed to be drained with weep holes between storm events.

The two chambers are otherwise unconnected, with sewage flowing only through the upper sedimentation chamber and no flow of sewage in the lower digestion chamber.

Settled solids in the RBC and the final settling tank are often pumped back to the equalization/sedimentation chamber, which precedes the RBC, for storage and digestion.

The filter usually consists of a sedimentation chamber as pre-treatment device to remove litter, debris, gross pollutants and medium-sized sediments; a weir; followed by a sand layer that filters sediments, finer particulates and dissolved pollutants.