AWWA WQTC64080

The abstract of this slide presentation includes these bulleted points: ultrafiltration (UF) membranes will remove all microbiological species as well as some viruses; UF membranes are not an absolute barrier to viruses and humic materials; natural organic matter (NOM) is of great importance in the formation of disinfection byproducts (DBPs); NOM removal optimization may be achieved by pretreatment with coagulants and/or powdered activated carbon (PAC) or post-treatment with granular activated carbon (GAC); the Clyde Potts UF Membrane Plant has achieved additional total organic carbon (TOC) removal and has produced low DBPs through the combined use of UF and post-GAC, than with just UF alone. The summary of the project presented in this slide presentation includes these points: NOM is of great importance in the formation of DBPs; NOM removal optimization may be achieved by pretreatment with enhanced coagulation and/or PAC or post-treatment with GAC; GAC has been shown to be effective when used in combination with UF in removing additional TOC and producing low DBPs for a source water with low TOC; post-GAC vs. pre-enhanced coagulation, less money in the long run; no need for flocculation/sedimentation basins; no coagulants to feed continuously; no coagulation chemistry to worry about; no residuals to dispose of; and, % removal efficiency probably based on source water quality and EBCT. Conclusions were that: UF is good for removing TOC and producing low DBPs for a source water with low TOC; and, UF + GAC is better for removing TOC and producing low DBPs for a source water with low TOC.