State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University , Shanghai, 200092, China.
Environ Sci Technol. 2014 Oct 21;48(20):12190-8. doi: 10.1021/es502115x. Epub 2014 Oct 2.
Haloacetamides (HAcAms), an emerging class of nitrogen-based disinfection byproducts (N-DBPs) of health concern in drinking water, have been found in drinking waters at μg/L levels. However, there is a limited understanding about the formation, speciation, and control of halogenated HAcAms. Higher ultraviolet (UV) doses and UV advanced oxidation (UV/H2O2) processes (AOPs) are under consideration for the treatment of trace organic pollutants. The objective of this study was to examine the potential of pretreatment with UV irradiation, H2O2 oxidation, and a UV/H2O2 AOP for minimizing the formation of HAcAms, as well as other emerging N-DBPs, during postchlorination. We investigated changes in HAcAm formation and speciation attributed to UV, H2O2 or UV/H2O2 followed by the application of free chlorine to quench any excess hydrogen peroxide and to provide residual disinfection. The results showed that low-pressure UV irradiation alone (19.5-585 mJ/cm(2)) and H2O2 preoxidation alone (2-20 mg/L) did not significantly change total HAcAm formation during subsequent chlorination. However, H2O2 preoxidation alone resulted in diiodoacetamide formation in two iodide-containing waters and increased bromine utilization. Alternatively, UV/H2O2 preoxidation using UV (585 mJ/cm(2)) and H2O2 (10 mg/L) doses typically employed for trace contaminant removal controlled the formation of HAcAms and several other N-DBPs in drinking water.
卤乙酰胺（HAcAms）作为一类新兴的氮基饮用水消毒副产物（N-DBPs），其浓度通常在微克/升水平，对健康存在潜在威胁，已在饮用水中被检出。然而，对于卤代 HAcAms 的形成、形态和控制，人们的了解还很有限。更高剂量的紫外线（UV）和紫外线高级氧化（UV/H2O2）工艺（AOPs）正被考虑用于处理痕量有机污染物。本研究的目的是考察 UV 辐照、H2O2 氧化和 UV/H2O2 AOP 预处理对减少加氯后 HAcAms 及其他新兴 N-DBPs 形成的潜力。我们研究了归因于 UV、H2O2 或 UV/H2O2 的 HAcAm 形成和形态变化，随后应用自由氯来淬灭任何过量的过氧化氢，并提供剩余的消毒。结果表明，单独的低压 UV 辐照（19.5-585 mJ/cm2）和单独的 H2O2 预氧化（2-20 mg/L）在随后的氯化过程中并没有显著改变总 HAcAm 的形成。然而，单独的 H2O2 预氧化导致两种含碘水中二碘乙酰胺的形成，并增加了溴的利用率。相比之下，通常用于去除痕量污染物的 UV（585 mJ/cm2）和 H2O2（10 mg/L）剂量的 UV/H2O2 预氧化控制了饮用水中 HAcAms 和其他几种 N-DBPs 的形成。
