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，以控制季节性味道和气味产生的物质。AECOM是其中一个系统的设计顾问。对UV/H_2O_2饮用水处理技术现状的初步回顾揭示了这一过程基础科学中的几个重要知识空白。到目前为止，许多UV/H_2O_2的研究都集中在单独的UV/H_2O_2过程上，而忽略了UV/H_2O_2过程与上游或下游应用的其他化学品之间可能涉及的潜在复杂因素。事实上，这些相互作用确实存在，而自信地设计和操作UV/H_2O_2处理过程的能力要求我们理解与这些潜在相互作用相关的所有影响。本文提出的研究就是针对这些知识空白展开的。所获得的信息将对多伦多新设施的设计和运营以及AECOM作为世界领先的尖端治疗技术设计公司的声誉产生立竿见影的效果。 有待探讨的具体现象包括： 1.上游工序余氯对UV/H_2O_2性能的影响； 2.在上游AOP残留过氧化氢存在的情况下，或在存在过氧化氢猝灭剂的情况下，影响下游氯胺形成的因素； 3.不同的残余过氧化氢熄灭方法，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；以及 4.过氧化氢氯反应生成单线态氧量及其对消毒副产物生成潜力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.