Department of Chemistry and Chemical Biology, Graduate School of Engineering, Gunma University, 1-5-1 Tenjin-cho, Kiryu, Gunma 376-8515, Japan.
Chemosphere. 2013 Jan;90(4):1359-65. doi: 10.1016/j.chemosphere.2012.07.056. Epub 2012 Aug 22.
This paper reports on the photodecomposition of aqueous humic acid (HA) by a TiO(2)-coated ceramic foam filter (TCF) reactor and on the potential for the formation of disinfection byproducts (DBPs) upon chlorination of the photocatalytically treated solutions. This photocatalytic reactor can also be applied to the removal of natural organic matter (NOM) in swamp waters. The proposed photocatalytic reaction system was operated as per standardized methodologies. First, the ability of the TCF to decompose HA (a representative compound of NOM) was evaluated from the changes in the total organic carbon (TOC) and UV(254) with the reaction time. Remarkably, TOC removal and UV(254) values ranging from 44% to 61% and from 60% to 83%, respectively, were achieved. The potential for the formation of DBPs (total trihalomethane and total haloacetic acid) by chlorination of the phototreated solution was strongly dependent on the TOC removal and UV(254) values in the solution. The degree of photodecomposition of NOMs in the swamp water samples and the DBP formation potential showed similar trends as in the case of the standard solutions containing HA. The method used in this study could be effectively used to evaluate the efficiency of TCF for reducing HA and NOM, while suppressing the formation of DBP products.
本文报告了 TiO2涂覆陶瓷泡沫过滤器（TCF）反应器中水溶液腐殖酸（HA）的光解情况，以及经光催化处理后的溶液氯化时可能形成消毒副产物（DBP）的情况。这种光催化反应器也可应用于去除沼泽水中的天然有机物（NOM）。所提出的光催化反应系统按照标准化方法进行操作。首先，通过测量反应时间内总有机碳（TOC）和 UV（254）的变化，评估 TCF 分解 HA（NOM 的代表性化合物）的能力。值得注意的是，TOC 去除率和 UV（254）值分别达到了 44%至 61%和 60%至 83%。经光处理的溶液氯化生成 DBP（总三卤甲烷和总卤乙酸）的潜力强烈依赖于溶液中的 TOC 去除率和 UV（254）值。沼泽水样中 NOM 的光分解程度和 DBP 生成潜力与含有 HA 的标准溶液的情况相似。本研究中使用的方法可有效用于评估 TCF 降低 HA 和 NOM 的效率，同时抑制 DBP 产物的形成。
