Somathilake Purnima, Dominic John Albino, Achari Gopal, Langford Cooper H, Tay Joo-Hwa
Department of Civil Engineering, Schulich School of Engineering, University of Calgary , Calgary , AB , Canada.
Department of Chemistry, University of Calgary , Calgary , AB , Canada.
Environ Technol. 2019 Sep;40(23):3031-3039. doi: 10.1080/09593330.2018.1464065. Epub 2018 May 2.
This study evaluates the influence of UV dose on degradation of carbamazepine (CBZ) in wastewater under UV-C (λ = 254 nm) photolysis with and without HO. The rate of degradation of CBZ exhibited a direct dependence on the intensity of incident UV irradiation as the rate of degradation was observed to increase linearly ( = 0.98) with UV intensity between 1.67 and 8.95 × 10 photons/s. More than 95% of the CBZ that spiked in wastewater rapidly degraded within 4 min with a first-order rate constant of 1.2 min for an optimum HO dose of 100 mg/L. Bench-scale continuous flow reactor experiments also showed that CBZ degraded with first-order kinetics at a rate constant of 1.02 min. The kinetic parameters obtained for a continuous bench-scale reactor were in good agreement with the relationships developed through batch experiments with only a marginal deviation of ± 6.5%. The relationship between UV intensity and CBZ degradation rate obtained in this study was extrapolated to the UV disinfection unit of a wastewater treatment plant to predict possible degradation of CBZ during UV disinfection. The addition of 100 mg/L of HO to the secondary-treated effluent entering the UV disinfection unit is predicted to achieve over 60% degradation of CBZ. CBZ carbamazepine; AOPs advanced oxidation processes; UV ultraviolet radiation; UV-C ultraviolet C ( = 254 nm) radiation; NZVI non-zerovalent iron; WWTP wastewater treatment plant; HPLC high-performance liquid chromatography.
本研究评估了在有和没有过氧化氢（HO）存在的情况下，紫外剂量对紫外-C（λ = 254 nm）光解废水中卡马西平（CBZ）降解的影响。卡马西平的降解速率与入射紫外线辐射强度直接相关，因为观察到降解速率在1.67至8.95×10个光子/秒的紫外线强度范围内随紫外线强度呈线性增加（ = 0.98）。对于100 mg/L的最佳过氧化氢剂量，废水中添加的卡马西平超过95%在4分钟内迅速降解，一级反应速率常数为1.2分钟。小型连续流反应器实验还表明，卡马西平以一级动力学降解，速率常数为1.02分钟。连续小型反应器获得的动力学参数与通过批量实验得出的关系吻合良好，偏差仅为±6.5%。本研究中获得的紫外线强度与卡马西平降解速率之间的关系被外推到污水处理厂的紫外线消毒单元，以预测紫外线消毒过程中卡马西平可能的降解情况。预计向进入紫外线消毒单元的二级处理出水添加100 mg/L的过氧化氢可实现卡马西平超过60%的降解。 CBZ卡马西平；AOPs高级氧化工艺；UV紫外线辐射；UV-C紫外线C（λ = 254 nm）辐射；NZVI非零价铁；WWTP污水处理厂；HPLC高效液相色谱法
