oa Civil Engineering = Siviele Ingenieurswese - The removal of solids in the purification of sewage
The reasons why screenings and detritus are removed from sewage as a preliminary step in purification are sketched briefly, and it is suggested that the object of these processes will be modified in future to minimise the disposal of the material removed from the sewage. The mechanism of the settling of screened sewage, humus and activated sludge is discussed and the need for a settling characteristics analysis as an essential step in the design process is put forward. A practical method of determining the settling characteristic is descriptionbed. The hydraulic considerations in sedimentation tank design are discussed briefly and the adaptation of the design of the tank of the future to function in harmony with the natural process of sedimentation is suggested.
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