Badi Mojtaba Yegane, Esrafili Ali, Pasalari Hasan, Kalantary Roshanak Rezaei, Ahmadi Ehsan, Gholami Mitra, Azari Ali
1Research Center for Environmental Health Technology, Iran University of Medical Sciences, Tehran, Iran.
2Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, Tehran, Iran.
J Environ Health Sci Eng. 2019 Jul 12;17(2):685-700. doi: 10.1007/s40201-019-00384-9. eCollection 2019 Dec.
The present study aimed to model and optimize the dimethyl phthalate (DMP) degradation from aqueous solution using UV/ NaSO/Fe system based on the response surface methodology (RSM). A high removal efficiency (97%) and TOC reduction (64.2%) were obtained under optimum conditions i.e. contact time = 90 min, SPS concentration = 0.601 mM/L, Fe = 0.075 mM/L, pH = 11 and DMP concentration = 5 mg/L. Quenching experiments confirmed that sulfate radicals were predominant radical species for DMP degradation. The effect of CO on DMP degradation was more complicated than other aquatic background anions. The possible pathway for DMP decomposition was proposed according to HPLC and GC-MS analysis. The average oxidation state (AOS) and carbon oxidation state (COS) values as biodegradability indicators demonstrated that the UV/SPS/Fe system can improve the bioavailability of DMP over the time. Finally, the performance of UV/SPS/Fe system for DMP treatment in different aquatic solutions: tap water, surface runoff, treated and raw wastewater were found to be 95.7, 88.5, 80.5, and 56.4%, respectively. Graphical abstract.
本研究旨在基于响应面法（RSM）对紫外/过硫酸钠/铁体系从水溶液中降解邻苯二甲酸二甲酯（DMP）进行建模和优化。在最佳条件下，即接触时间 = 90分钟、过硫酸钠浓度 = 0.601 mM/L、铁 = 0.075 mM/L、pH = 11以及DMP浓度 = 5 mg/L时，获得了较高的去除效率（97%）和总有机碳减少率（64.2%）。猝灭实验证实硫酸根自由基是DMP降解的主要自由基种类。碳酸根对DMP降解的影响比其他水体背景阴离子更为复杂。根据高效液相色谱（HPLC）和气相色谱 - 质谱联用（GC - MS）分析，提出了DMP分解的可能途径。作为生物降解性指标的平均氧化态（AOS）和碳氧化态（COS）值表明，随着时间的推移，紫外/过硫酸钠/铁体系可提高DMP的生物可利用性。最后，发现紫外/过硫酸钠/铁体系在不同水体溶液（自来水、地表径流、处理后废水和原废水）中处理DMP的性能分别为95.7%、88.5%、80.5%和56.4%。图形摘要。
