Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP(3)), Department of Environmental Science & Engineering, Fudan University, 220 Handan Road, Shanghai 200433, PR China.
School of Sustainable Engineering and The Built Environment, Ira A. Fulton Schools of Engineering, Arizona State University, ISTB4 Room 362, Tempe, AZ 85287-5306, USA.
Water Res. 2015 Apr 15;73:304-10. doi: 10.1016/j.watres.2015.01.040. Epub 2015 Feb 7.
A new method of ultraviolet light (UV) activated persulfate (PS) oxidation was investigated to regenerate granular activated carbon (GAC) in drinking water applications. The improvements in iodine and methylene blue numbers measured in the GAC after ultraviolet- (UV) activated persulfate suggested that the GAC preloaded with natural organic matter (NOM) was chemically regenerated. An experimental matrix for UV-activated persulfate regeneration included a range of persulfate doses and different UV wavelengths. Over 87% of the initial iodine number for GAC was restored under the optimum conditions, perfulfate dosage 60 g/L and UV exposure 1.75 × 10(4) mJ/cm(2). The persulfate dosages had little effect on the recovery of the methylene blue number, which was approximately 65%. Persulfate activation at 185 nm was superior to activation at 254 nm. UV activation of persulfate in the presence of GAC produced acid, lowering the solution pH. Higher persulfate concentrations and UV exposure resulted in greater GAC regeneration. Typical organic and inorganic byproducts (e.g., benzene compounds and sulfate ions) were measured as a component of treated water quality safety. This study provides a proof-of-concept that can be used to optimize pilot-scale and full-scale UV-activated persulfate for regeneration of NOM-saturated GAC.
研究了一种新的紫外光（UV）激活过硫酸盐（PS）氧化方法，以再生饮用水应用中的颗粒活性炭（GAC）。GAC 经过紫外-（UV）激活过硫酸盐处理后碘值和亚甲蓝值的提高表明，GAC 已被化学再生，其中负载有天然有机物（NOM）。UV 激活过硫酸盐再生的实验矩阵包括过硫酸盐剂量和不同 UV 波长的范围。在最佳条件下，过硫酸盐剂量为 60 g/L，UV 辐照为 1.75×10(4) mJ/cm(2)，GAC 的初始碘值恢复了 87%以上。过硫酸盐剂量对亚甲蓝值的恢复影响不大，约为 65%。185nm 下的过硫酸盐活化优于 254nm 下的活化。GAC 存在下过硫酸盐的 UV 活化会产生酸，降低溶液 pH 值。较高的过硫酸盐浓度和 UV 暴露会导致更大的 GAC 再生。典型的有机和无机副产物（例如，苯化合物和硫酸根离子）被测量为处理后水质安全的一部分。这项研究提供了一个概念验证，可以用于优化中试和全规模 UV 激活过硫酸盐来再生 NOM 饱和的 GAC。
