Department of Environmental Engineering and Earth Sciences, Clemson University, 342 Computer Court, Anderson, SC 29625, United States.
Department of Environmental Engineering and Earth Sciences, Clemson University, 342 Computer Court, Anderson, SC 29625, United States.
Water Res. 2017 Apr 15;113:223-230. doi: 10.1016/j.watres.2017.01.019. Epub 2017 Jan 9.
The main objectives of this study were to develop an understanding of silver impregnated activated carbon (SIAC) preparation for enhanced bromide (Br) removal from water, and to investigate the impact of aqueous background composition on the Br removal. Several SIACs were produced using various combinations of oxidation and silver impregnation procedures and powdered activated carbons (ACs). Regardless of the preparation procedure, SIACs showed significantly Br uptakes than the virgin ACs. The Br removal efficiency was affected by (i) the background water composition (e.g. Cl and NOM competition reduced the Br uptake), (ii) silver impregnation process (e.g. silver content, pre-oxidation of virgin AC; silver impregnation largely increased the Br removal, and the pre-oxidation of AC prior to silver impregnation was found to be important), and (iii) AC characteristics (e.g. surface area, oxygen content; SIACs with higher silver contents and larger surface areas exhibited higher degrees of Br removal). The Br removal by SIAC reduced the formation of brominated THMs. Jar test results showed that coagulation did not have an impact on Br removal by SIAC.
本研究的主要目的是了解载银活性炭（SIAC）的制备方法，以增强水中溴化物（Br）的去除，并研究水相背景组成对 Br 去除的影响。使用各种氧化和载银浸渍程序和粉末状活性炭（AC）制备了几种 SIAC。无论制备程序如何，SIAC 对 Br 的吸附能力均明显高于原始 AC。Br 去除效率受到（i）背景水组成（例如，Cl 和 NOM 的竞争降低了 Br 的吸附），（ii）载银浸渍过程（例如，银含量，原始 AC 的预氧化；银浸渍大量增加了 Br 的去除，发现 AC 预先氧化在载银浸渍之前很重要）和（iii）AC 特性（例如，表面积，氧含量；具有较高银含量和较大表面积的 SIAC 表现出更高程度的 Br 去除）的影响。SIAC 对 Br 的去除减少了溴代三卤甲烷的形成。瓶试验结果表明，混凝对 SIAC 去除 Br 没有影响。
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