AWWA ACE62967

This slide presentation outlines a study on the use of disinfectant combinations to limit disinfection byproduct (DBP) formation. Project goals included examining advanced treatment technologies and disinfectant combinations for estuarine supplies to meet current and future regulations and to meet water quality goals of water utilities. Specific objectives included: evaluate combinations of disinfectants on estuarine waters to reduce DBP formation; and, evaluate effects of disinfectant combinations on distribution systems. Pilot and distribution system testing included distribution system testing of annular reactors and batch incubations in bottles. Parameters analyzed included: DBPs - THM4, HAA9; Bromate; Chlorite, chlorate; NDMA; natural organic matter (NOM), microbial regrowth - AOC, BDOC; HPC, ammonia-oxidizing bacteria (AOB); ammonia (free and total), nitrite, nitrate; and, NOM. Results are given for: total organic carbon (TOC); UV_254nm; THM4; HAA8; chlorite and chlorate; bromate; THM4 in ARs; and, HAA8 in ARs. Includes figures.