AWWA JAW51283

The integrated disinfection design framework (IDDF) is a new approach for determiningdisinfection requirements for a water treatment facility. The framework may be applied in place of the procedures in the US Environmental Protection Agency's Surface Water Treatment Rule guidance manual. Potential benefits include lower disinfectant dosages, reduced disinfectant costs, and reduced formation of disinfection byproducts. The feasibility of the IDDF was presented in an AWWA Research Foundation-sponsored project completed in 1998. A user-friendly model has been developed based on the original IDDF concepts; this model allows utility personnel, consultants, and regulators to determine site-specific disinfection requirements. The model has four components or modules: hydraulic characteristics; disinfectant demand-decay; inactivation kinetics; and, disinfection byproduct formation. Implementation of the IDDF at the Aurora (Colorado) Water Department is in progress with a chlorine dioxide dosage reduction of approximately 15 percent. Other IDDF implementation studies have indicated that primary disinfectant dosages can be reduced by 8-35 percent with a corresponding reduction in disinfection byproducts. Includes 6 references, tables, figures.