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

多伦多市正在考虑在其几个饮用水处理厂安装 UV/H2O2 高级氧化装置来控制季节性味道和异味物质。 AECOM 是其中一个系统的设计顾问。对用于饮用水处理的 UV/H2O2 的最新技术的初步回顾揭示了该过程的基础科学中的几个重要的知识差距。迄今为止，许多 UV/H2O2 研究都集中在孤立的 UV/H2O2 过程上，忽略了可能涉及 UV/H2O2 过程与上游或下游应用的其他化学品之间相互作用的潜在复杂因素。事实上，这些相互作用确实存在，并且要自信地设计和操作 UV/H2O2 处理工艺，我们需要了解与这些潜在相互作用相关的所有影响。这里提出的研究就是针对这些知识差距。所获信息将立即有益于多伦多新设施的设计和运营，以及 AECOM 作为尖端处理技术设计领域的世界领导者的声誉。 需要探讨的具体现象包括： 1.上游工艺余氯对UV/H2O2性能的影响； 2.上游AOP残留H2O2存在或H2O2猝灭剂存在时影响下游氯胺形成的因素； 3.不同残余H2O2淬灭方法（包括氯、亚硫酸盐和硫代硫酸盐）在不同pH和温度下的反应动力学和操作问题；和 4、H2O2氯反应形成单线态氧的量，及其对消毒副产物形成电位和有机物特性的影响。 这项工作将资助一名研究生和（部分）一名博士后研究员，为期两年。

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.