The seasonal sunlight-induced photodegradation of seven emerging contaminants (ECs) in a municipal wastewater treatment lagoon was examined in a lab-scale study over a year. There were obvious seasonal trends for the degradation rates of all the ECs in both ultrapure water and lagoon wastewater matrices with strong correlations (R² = 0.65–0.90) between sunlight irradiance and their degradation rates in pure water, indicating the dominant influence of natural sunlight intensity. This suggests the importance of recording light source conditions for the purposes of data interpretation and modelling of sunlight-induced photolysis. It was demonstrated that photolysis of these ECs was likely to occur only within the first 10 cm of the lagoon surface. Strongly temperature dependent photodegradation was observed for the five ECs which primarily underwent indirect photolysis in the lagoon wastewater, and activation energy values (which could be used for simulation of the photodegradation process) were obtained for these compounds. The quantum yields of the ECs were determined under wastewater-relevant pH conditions. The APEX environmental model was adjusted to simulate the photodegradation of these ECs in the lagoon wastewater. The predicted results were largely in agreement with the seasonal measurements, with some overestimated photodegradation rates obtained for winter, suggesting that temperature should be included as a factor for modelling the photolysis of ECs. These results indicate that there is potential to establish a model to predict the photodegradation of a wide range of ECs in wastewater treatment lagoons to facilitate risk assessment of the treated wastewater.

中文翻译：

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阳光照射的污水池中新兴污染物的光降解，季节性测量，环境影响和建模

在一年的实验室规模研究中，研究了季节性的阳光引起的市政废水处理泻湖中7种新兴污染物（EC）的光降解。在超纯水和泻湖废水基质中，所有EC的降解率都有明显的季节性趋势，且相关性很强（R ²= 0.65–0.90）之间的日光辐照度及其在纯水中的降解率，表明自然光强度的主要影响。这表明了记录光源条件的重要性，以便进行数据解释和阳光诱导的光解建模。结果表明，这些EC的光解仅可能发生在泻湖表面的前10厘米之内。对主要在泻湖废水中进行间接光解的五个EC观察到了强烈的温度依赖性光降解，并获得了这些化合物的活化能值（可用于模拟光降解过程）。在与废水有关的pH条件下确定了EC的量子产率。调整了APEX环境模型，以模拟这些ECs在泻湖废水中的光降解。预测结果与季节测量结果基本吻合，并且冬季获得了一些高估的光降解速率，这表明温度应作为模拟EC的光解的因素。这些结果表明，有可能建立模型来预测废水处理泻湖中各种EC的光降解，以促进对处理后废水的风险评估。