Drinking water treatment with UV/H2O2: interactions with upstream and downstream processes

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The City of Toronto is considering installation of UV/H2O2 advanced oxidation to control seasonal taste and odour-causing substances at several of its drinking water treatment plants. AECOM is a consultant on the design of one of those systems. A preliminary review of the state of the art of UV/H2O2 for drinking water treatment has revealed several important knowledge gaps in the fundamental science of this process. To date, much of the UV/H2O2 research has focused on the UV/H2O2 process in isolation, ignoring the potential complicating factors that might be involved with interactions between the UV/H2O2 process and other chemicals applied upstream or downstream. In reality, these interactions do exist, and the ability to confidently design and operate a UV/H2O2 treatment process requires that we understand all of the implications related to these potential interactions. The research proposed here is aimed at these knowledge gaps. The information learned will be of immediate benefit for the design and operation of Toronto's new facilities, as well as to AECOM's reputation as a world leader in the design of leading-edge treatment technologies. The specific phenomena to be explored include:1.The effects of residual chlorine from upstream processes on UV/H2O2 performance;2.Factors that affect downstream chloramine formation in the presence of residual H2O2 from the upstream AOP, or by H2O2 quenching agents; 3.The reaction kinetics and operational issues associated with different residual H2O2 quenching methods, including chlorine, sulfite, and thiosulphate at different pH and temperatures; and 4.The amount of singlet oxygen formation due to H2O2 + chlorine reaction, and its impact on disinfection by-product formation potential, and organic matter characteristics.The work will fund one graduate student and (partially) one postdoctoral fellow for a period of 2 years.