Department of Civil Engineering, University of Calgary, 2500 University Drive NW, Calgary, AB, T2N 1N4, Canada.
Department of Civil Engineering, University of Calgary, 2500 University Drive NW, Calgary, AB, T2N 1N4, Canada.
Chemosphere. 2019 May;222:1-8. doi: 10.1016/j.chemosphere.2019.01.097. Epub 2019 Jan 17.
In this study, the performance of an integrated technology, combining biological treatment with advanced oxidation process in sequence, was evaluated for the degradation of sulfolane in aqueous media. In addition, the impact of biological process on AOP was also studied by assessing residual sulfolane, nutrient and total suspended solids (TSS) concentrations. The integration of activated sludge process with UVC/HO resulted in more than 81% of sulfolane degradation in less than 24 h. It was observed that mineralization was much faster in biological system compared to AOP. Mechanistically, the process of degradation is different in the two processes as various by-products were identified during UVC/HO but not during the biological process. The impact of residual sulfolane concentration on UVC/HO was significant beyond a concentration of 30 mg L, while below 30 mg L the rate of degradation was independent of sulfolane concentration. Residual nutrients from biological systems did not impact AOP performance. Nevertheless, presence of TSS >44 mg L had a negative impact on the performance of UVC/HO by reducing UV transmittance which led to retardation of sulfolane degradation. The application of UVC/HO after biological treatment was an advantage as UVC/HO could perform dual roles of oxidant and disinfectant.
在这项研究中，评估了一种将生物处理与高级氧化工艺顺序结合的集成技术在水介质中降解环丁砜的性能。此外，还通过评估残留环丁砜、营养物和总悬浮固体 (TSS) 浓度来研究生物过程对 AOP 的影响。将活性污泥工艺与 UVC/HO 结合使用，不到 24 小时就可使环丁砜降解超过 81%。结果表明，与 AOP 相比，生物系统中的矿化速度更快。从机理上讲，这两个过程的降解过程不同，因为在 UVC/HO 过程中鉴定出了各种副产物，但在生物过程中没有。残留环丁砜浓度对 UVC/HO 的影响非常显著，超过 30mg/L 时，降解速率与环丁砜浓度无关。来自生物系统的残留营养物不会影响 AOP 的性能。然而，TSS 浓度>44mg/L 会通过降低紫外线透射率对 UVC/HO 的性能产生负面影响，从而导致环丁砜降解速度减缓。在生物处理后应用 UVC/HO 是有利的，因为 UVC/HO 可以同时充当氧化剂和消毒剂。
