Summary:

The knowledge of the physical, rheological and hydraulic parameters of sewage is required for proper dimensioning of the technological lines of tubular transportation at sewage plants. The authors investigated sewage sediments that originated at the Varsovian sewage treatment plants. Flow tests of sediments were performed with the tubular system of diameter D=0,0207 m and allowed the
determination of rheological and hydraulic profile of the tested medium. The
description of rheological behavior of the sediments was based on the three-parameter Herschel-Bulkley's model as a function of mass concentration cs. The authors suggested usage of the dimensionless criterion λ(Regen) as a base for
pipelines design.