Yen Hsing Yuan, Yen Li Shuang
a Chemical and Biochemical Engineering Department , Kao Yuan University , Lujhu District, Kaohsiung City 82151 , Taiwan, Republic of China.
Environ Technol. 2015 Jan-Feb;36(1-4):417-23. doi: 10.1080/09593330.2014.951075. Epub 2014 Aug 26.
In this study, the merits of using H2O2/UV oxidation for reducing trihalomethane formation potential (THMFP), colour, and dissolved organic carbon (DOC) of smaller molecular humic acid were investigated, especially the energy consumption based on EEO. The results show that THMFP decreases by increasing oxidation time, H2O2 dose and UV intensity. The reaction constant in descending order is kColour>kDOC>kTHMFP. Furthermore, EEO shows three trends. First, it decreases as H2O2 dose increases. That is, by increasing the amount of H2O2 dose, the electrical energy efficiency becomes better. Second, EEO,9 W>EEO,13 W, implying that higher UV power would result in a higher electrical energy efficiency. Third, EEO,THMFP>EEO,DOC>EEO,colour. That is, the electric energy efficiency is the best for colour removal, second for DOC removal, and third for THMFP reduction. The operation costs for 90% removal of colour, DOC, and THMFP are from 0.31 to 0.69, from 0.78 to 1.72, and from 1.11 to 2.29 US$/m3, respectively. However, reducing THMs to Taiwan's drinking water standard of 80 µg/L needs only 0.25-0.60 US$/m3. Therefore, the condition with UV of 9 W, H2O2 of 50 mg/L, and oxidation time of 23 min can be applied for THMs reduction as the cost is the smallest of 0.25 US$/m3, even lower than current Taiwan's drinking water price of 0.3 US$/m3.
本研究考察了采用H2O2/UV氧化法降低小分子腐殖酸的三卤甲烷生成势（THMFP）、色度和溶解有机碳（DOC）的优点，特别是基于电能效率（EEO）的能耗情况。结果表明，THMFP随氧化时间、H2O2投加量和紫外光强度的增加而降低。反应常数大小顺序为k色度>k DOC>k THMFP。此外，EEO呈现出三种趋势。其一，随着H2O2投加量的增加而降低。也就是说，通过增加H2O2投加量，电能效率会变好。其二，EEO,9W>EEO,13W，这意味着更高的紫外光功率会带来更高的电能效率。其三，EEO,THMFP>EEO,DOC>EEO,色度。即电能效率对色度去除效果最佳，其次是DOC去除，对THMFP降低效果最差。去除90%的色度、DOC和THMFP的运行成本分别为0.31至0.69美元/m3、0.78至1.72美元/m³和1.11至2.29美元/m³。然而，将三卤甲烷降低至台湾饮用水标准80μg/L仅需0.25至0.60美元/m³。因此，紫外光9W、H2O2 50mg/L、氧化时间23min的条件可用于降低三卤甲烷，因为其成本最低，为0.25美元/m³，甚至低于台湾目前的饮用水价格0.3美元/m³。
