Northern Region Persistent Organic Pollution Control (NRPOP) Laboratory, Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John's, NL, A1B 3X5, Canada.
Key Laboratory of Regional Energy and Environmental Systems Optimization, Ministry of Education, Resources and Environmental Research Academy, North China Electric Power University, Beijing, 102206, China.
Environ Sci Pollut Res Int. 2018 Jan;25(3):2691-2701. doi: 10.1007/s11356-017-0701-z. Epub 2017 Nov 13.
In this study, a UV/O hybrid advanced oxidation system was used to remove chemical oxygen demand (COD), ammonia nitrogen (NH-N), and atrazine (ATZ) from ATZ production wastewater. The removal of COD and NH-N, under different UV and O conditions, was found to follow pseudo-first-order kinetics with rate constants ranging from 0.0001-0.0048 and 0.0015-0.0056 min, respectively. The removal efficiency of ATZ was over 95% after 180 min treatment, regardless the level of UV power. A kinetic model was further proposed to simulate the removal processes and to quantify the individual roles and contributions of photolysis, direct O oxidation, and hydroxyl radical (OH·) induced oxidation. The experimental and kinetic modeling results agreed reasonably well with deviations of 12.2 and 13.1% for the removal of COD and NH-N, respectively. Photolysis contributed appreciably to the degradation of ATZ, while OH· played a dominant role for the removal of both COD and NH-N, especially in alkaline environments. This study provides insights into the treatment of ATZ containing wastewater using UV/O and broadens the knowledge of kinetics of ozone-based advanced oxidation processes.
在这项研究中，采用 UV/O 混合高级氧化系统去除莠去津生产废水中的化学需氧量（COD）、氨氮（NH-N）和莠去津（ATZ）。结果表明，在不同的 UV 和 O 条件下，COD 和 NH-N 的去除遵循准一级动力学，速率常数范围分别为 0.0001-0.0048 和 0.0015-0.0056 min。无论 UV 功率水平如何，经过 180 min 处理后，ATZ 的去除率均超过 95%。进一步提出了一个动力学模型来模拟去除过程，并量化光解、直接 O 氧化和羟基自由基（OH·）诱导氧化的单独作用和贡献。实验和动力学建模结果的偏差分别为 12.2%和 13.1%，这与 COD 和 NH-N 的去除情况相当吻合。光解对 ATZ 的降解有显著贡献，而 OH·对 COD 和 NH-N 的去除起主导作用，尤其是在碱性环境中。这项研究为 UV/O 处理含莠去津废水提供了新的见解，并拓宽了基于臭氧的高级氧化过程动力学的知识。
