College of Food and Chemical Engineering, Shaoyang University, No. 28, Lane 3, Shaoshui West Road, Shaoyang, 422000, Hunan, China.
Environ Sci Pollut Res Int. 2022 Mar;29(14):20289-20295. doi: 10.1007/s11356-021-17063-8. Epub 2021 Nov 3.
As an advanced oxidation process, vacuum ultraviolet/ultraviolet (VUV/UV) has been intensively studied for drinking water treatment, but assessment of its feasibility for wastewater treatment has rarely been conducted. This study investigated the treatment of fluorine-containing pharmaceutical wastewater by VUV/UV process and examined the defluorination and therefore the improvement of biodegradability of the wastewater after the process. The results indicated that the degradation of a model fluorine-containing organic compound (namely, 4-fluorophenol) was mainly achieved via the attack of the fluorine atom linking directly to the aromatic ring by the HO generated from VUV photolysis of water. As the solution pH increased from 4.0 to 10.0, the COD removal efficiency of the real pharmaceutical wastewater decreased slightly from 18.1 to 15.9%, while the release ratio of F increased from 50.8 to 75.5%. As the dissolved oxygen increased from 0.15 to 12 mg L, the removal efficiency of COD and the release ratio of F increased from 9.2 to 17.1% and from 48.2 to 75.5%, respectively. The biodegradability index (BOD/COD) increased significantly from 0.24 to 0.47 after the VUV/UV irradiation, which confirmed the feasibility of applying the VUV/UV process for improving biodegradability of the pharmaceutical wastewater.
作为一种高级氧化工艺，真空紫外线/紫外线（VUV/UV）已被广泛研究用于饮用水处理，但评估其用于废水处理的可行性的研究却很少。本研究考察了 VUV/UV 工艺处理含氟医药废水的效果，并研究了废水的除氟效果和生物降解性的提高。结果表明，模型含氟有机化合物（即 4-氟苯酚）的降解主要是通过 VUV 光解水产生的 HO 攻击与芳环直接相连的氟原子来实现的。随着溶液 pH 值从 4.0 增加到 10.0，实际医药废水中 COD 的去除效率从 18.1%略微下降到 15.9%，而 F 的释放比例从 50.8%增加到 75.5%。随着溶解氧从 0.15 增加到 12 mg/L，COD 的去除效率和 F 的释放比例分别从 9.2%增加到 17.1%和从 48.2%增加到 75.5%。VUV/UV 辐照后，生物降解性指数（BOD/COD）从 0.24 显著增加到 0.47，这证实了 VUV/UV 工艺用于提高医药废水生物降解性的可行性。
