School of Civil Engineering and Division of Environmental & Ecological Engineering, Purdue University, West Lafayette, IN 47907-2051, USA.
Water Environ Res. 2012 Nov;84(11):2017-27. doi: 10.2175/106143012x13373550426634.
Bench-scale experiments were conducted with municipal wastewater effluent samples to examine the feasibility of combined application of ozone and ultraviolet (UV) radiation for disinfection. Effluent samples displayed rapid initial ozone demand, which promotes ozone transfer but diminishes disinfection efficacy. Ozone doses up to 10 mg/L yielded only trace quantities of residual ozone; despite the fact that initial ozone demand was never exceeded, quantifiable (though variable) inactivation of E. coli was observed, along with modest improvements of UV transmittance. Results from collimated beam experiments demonstrated that compliance with effluent discharge permit limitations could be achieved consistently with a UV254 dose of 12.4 mJ/cm2 at a pre-ozonation dose of 2 to 3 mg/L. In the absence of pre-ozonation, consistent compliance was observed at a UV dose of 16.5 mJ/cm2. No evidence of synergism between ozone and UV254 radiation was found in the measured inactivation responses of E. coli.
采用市政废水处理出水样本进行了台架试验，以考察臭氧与紫外线（UV）辐射联用进行消毒的可行性。出水样本表现出快速的初始臭氧需求，这促进了臭氧的转移，但降低了消毒效果。尽管初始臭氧需求从未超过，但仍观察到了臭氧剂量高达 10 mg/L 时仅产生痕量剩余臭氧；可量化（尽管存在变化）的大肠杆菌灭活，以及 UV 透射率的适度提高。平行光束试验的结果表明，在 2 至 3 mg/L 的预臭氧化剂量下，采用 12.4 mJ/cm2 的 UV254 剂量，可以持续符合废水排放许可证限制的要求。在没有预臭氧化的情况下，采用 16.5 mJ/cm2 的 UV 剂量也可以持续符合要求。在大肠杆菌的灭活响应测量中，未发现臭氧与 UV254 辐射之间存在协同作用的证据。
