Giannakis Stefanos, Darakas Efthymios, Escalas-Cañellas Antoni, Pulgarin César
Laboratory of Environmental Engineering and Planning, Department of Civil Engineering, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece.
Photochem Photobiol Sci. 2015 Mar;14(3):618-25. doi: 10.1039/c4pp00266k.
In this work, solar disinfection of wastewater was studied, focusing on the effect of selected environmental variables, namely light intensity, continuous/intermittent light delivery, and post-irradiation storage as well as dilution in lake water. These variables were studied for their effect on the disinfection efficiency and on post-irradiation survival/regrowth in undiluted wastewater and in wastewater diluted in lake water at different dilution rates. The bacterial inactivation curves were studied, and distinct kinetic phases were identified and interpreted. The dose primarily influenced the demonstration of phases and total inactivation times, independently of the irradiance. Intermittent illumination unevenly prolonged the required exposure time and highlighted the need for extended illumination times when unstable weather conditions are expected. Post-irradiation survival/regrowth in undiluted wastewater showed three distinct kinetic profiles, with transitions among them largely determined by the applied light dose. Lower doses resulted in similar inactivation profiles to the higher ones, when irradiation was followed by prolonged storage at high dilution rates in lake water. The studied factors show significant design and operation implications for solar wastewater applications based on local environmental conditions and water receptor restrictions.
在这项工作中，对废水的太阳能消毒进行了研究，重点关注选定的环境变量的影响，即光照强度、连续/间歇光照以及辐照后储存以及在湖水中的稀释。研究了这些变量对消毒效率以及未稀释废水和不同稀释率的湖水稀释废水中辐照后存活/再生长的影响。研究了细菌灭活曲线，并识别和解释了不同的动力学阶段。剂量主要影响阶段的表现和总灭活时间，与辐照度无关。间歇照明不均匀地延长了所需的暴露时间，并突出了在预期天气不稳定时延长照明时间的必要性。未稀释废水中辐照后的存活/再生长表现出三种不同的动力学特征，它们之间的转变很大程度上由施加的光剂量决定。当辐照后在湖水中以高稀释率长时间储存时，较低剂量导致的灭活特征与较高剂量相似。所研究的因素对基于当地环境条件和受纳水体限制的太阳能废水应用具有重要的设计和操作意义。
