Operational Results from a Biological and Chemically Enhanced High-Rate Clarification Solution for the Treatment of Wet Weather Flows

The North Texas Municipal Water District (NTMWD) serves 1.2 million customers by operating fourteen wastewater treatment plants (WWTP) of which four are regional wastewater treatment plants (RWWTP) including the Wilson Creek Regional Wastewater Treatment Plant (RWWTP). This facility discharges into Lake Lavon, which also serves as the District’s water supply. With continued growth of the service area and the increased challenge of wet weather flow management, NTMWD adopted a unique approach incorporating a dual-purpose solution providing advanced treatment of dry weather flows using a high-rate clarification process (ACTIFLO®), as well as biological treatment of all wet weather flows by converting the high-rate system into a biologically and chemically enhanced mode (BIOACTIFLO®). This paper presents operational experiences and challenges and results from successfully operating this facility during actual wet weather flow events.