School of Environmental Science and Engineering, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India.
Department of Civil Engineering, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India.
Environ Sci Pollut Res Int. 2023 Aug;30(36):85071-85086. doi: 10.1007/s11356-023-27596-9. Epub 2023 May 25.
Ethylene glycol or 1,2-ethanediol (EG) is a persistent and toxic substance in the environment and extensively applied in petrochemical, surfactants, antifreeze, asphalt emulsion paints, cosmetics, plastics, and polyester fiber industries. Degradation of EG by using ultraviolet (UV) activated hydrogen peroxide (HO) and persulfate (PS) or persulfate anion (SO) based advanced oxidation processes (AOPs) were explored. The result obtained demonstrate that UV/PS (85.7 ± 2.5%) has exhibited improved degradation efficiency of EG as compared to UV/HO (40.4 ± 3.2%) at optimal operating conditions of 24 mM of EG concentration, 5 mM of HO, 5 mM of PS, 1.02 mW cm of UV fluence, and pH of 7.0. Impacts of operating factors, including initial EG concentration, oxidant dosage, reaction duration, and the impact of different water quality parameters, were also explored in this present investigation. The degradation of EG in Milli-Q® water followed pseudo - first order reaction kinetics in both methods having a rate constant of about 0.070 min and 0.243 min for UV/HO and UV/PS, respectively, at optimum operating conditions. Additionally, an economic assessment was also conducted under optimal experimental conditions, and the electrical energy per order and total operational cost for treating per m of EG-laden wastewater was observed to be about 0.042 kWh m order and 0.221 $ m order, respectively, for UV/PS, which was slightly lower than UV/HO (0.146 kWh m order; 0.233 $ m order). The potential degradation mechanisms were proposed based on intermediate by-products detected by Fourier transform infrared (FTIR) spectroscopy and gas chromatography-mass spectroscopy (GC-MS). Moreover, real petrochemical effluent containing EG was also treated by UV/PS, demonstrating 74.7 ± 3.8% of EG and 40.7 ± 2.6% of total organic carbon removal at 5 mM of PS and 1.02 mW cm of UV fluence. A toxicity tests on Escherichia coli (E. coli) and Vigna radiata (green gram) confirmed non-toxic nature of UV/PS treated water.
乙二醇或 1,2-乙二醇（EG）是环境中一种持久性且有毒的物质，广泛应用于石化、表面活性剂、防冻剂、沥青乳液涂料、化妆品、塑料和聚酯纤维行业。本研究探索了使用紫外线（UV）激活过过氧化氢（HO）和过硫酸盐（PS）或过硫酸盐阴离子（SO）基高级氧化工艺（AOPs）降解 EG。结果表明，在 24 mM EG 浓度、5 mM HO、5 mM PS、1.02 mW cm 的 UV 光强和 pH 值为 7.0 的最佳操作条件下，UV/PS（85.7 ± 2.5%）比 UV/HO（40.4 ± 3.2%）具有更高的 EG 降解效率。本研究还探讨了操作因素的影响，包括初始 EG 浓度、氧化剂用量、反应时间以及不同水质参数的影响。在这两种方法中，Milli-Q®水中的 EG 降解均遵循准一级反应动力学，在最佳操作条件下，UV/HO 和 UV/PS 的速率常数分别约为 0.070 min 和 0.243 min。此外，在最佳实验条件下进行了经济评估，对于处理每立方米含 EG 的废水，UV/PS 的单位耗电量和总运行成本分别为 0.042 kWh m 序和 0.221 $ m 序，略低于 UV/HO（0.146 kWh m 序；0.233 $ m 序）。根据傅里叶变换红外（FTIR）光谱和气相色谱-质谱（GC-MS）检测到的中间产物，提出了潜在的降解机制。此外，还使用 UV/PS 处理了含有 EG 的实际石化废水，在 5 mM PS 和 1.02 mW cm 的 UV 光强下，EG 的去除率为 74.7 ± 3.8%，总有机碳的去除率为 40.7 ± 2.6%。对大肠杆菌（E. coli）和绿豆（绿豆）的毒性测试证实了 UV/PS 处理水的无毒性质。
