AWWA WQTC69304

This powerpoint presentation begins by providing a brief overview of several large taste and odor (T&O) events at a water treatment plant (WTP) which prompted the utility to consider installing T&O reduction treatment. An Ultraviolet (UV) Advanced Oxidation Process (AOP) was selected, and specific objectives for bench-scale testing included the following: evaluate UV AOP effectiveness for MIB oxidation on filtered water; evaluate two water quality conditions in the water collected at the tail end of the lake turnover (December sample); water collected after the lake turnover (February sample); determine if finished water MIB level goal of 5 ng/L can be achieved; and, determine if AOC levels significantly change as a result of UV AOPs. Conclusions from bench-scale UV AOP testing included the following: UV AOP showed over a 5 log reduction in MIB; water quality parameters were not impacted; AOC had a small increase from UV AOPs; UV AOPs can be located downstream of filtration; and, quenching of peroxide residual is necessary. A Cost comparison was completed based on bench-scale testing for treatment technologies. Presentation summary and conclusions indicate the following: UV AOPs can provide high levels of MIB reduction (>5 log); AOC creation was reasonable and allowed for UV reactors to be placed downstream of existing filters; AOC creation is water quality specific; UV AOP was cost competitive with ozone and GAC; and, the project is moving forward with design of UV AOP facility. Includes tables, figures.