Author(s): R. H. J. Sellin

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Abstract: Tests are described in which drag-reducing polymer additives are used to increase the flow velocity in a municipal sewer. The selected sewer has a diameter of 300 mm and carries the domestic sewage for a population of 10,000 but floods during heavy rainfall due to rainwater infiltration. A permanent polymer dosing station has been designed and constructed on this sewer and flow and depth measurement instruments have been included. Although the system has been designed to operate automatically during peak discharges tests were made under dry weather flow conditions which showed increases in sewer velocities of up to 70% using polymer concentrations ranging up to 60 parts per million of Polyox WSR-301.

DOI: https://doi.org/10.1080/00221687809499613

Year: 1978