Upgrading of a Conventional Surface Water Treatment Plant Utilizing Ultra Filtration Membrane Technology Preceded by Ballasted Coagulation Flocculation Clarification

This paper summarizes the expansion of a conventional surface water treatment facility using advanced technologies. The first technology employed is the use of ballasted coagulation/flocculation clarification for preliminary treatment. The second technology involves the use of ultrafiltration membranes. Both of these technologies have recently been utilized throughout the United States in various independent applications. Their joint use in the expansion of the Cass PWSD #7 treatment plant marks the first use of these combined technologies. The preliminary treatment process has provided solid turbidity removal prior to application to the ultrafiltration membrane units. As a result, the operation of the membrane units has been enhanced. This facility has now been operational for approximately one year. During this first year finished water quality has been maintained well below state and federal requirements.