Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Poursina St, Tehran, Iran.
J Environ Health Sci Eng. 2013 Dec 20;11(1):38. doi: 10.1186/2052-336X-11-38.
The widespread use of trichloroethylene (TCE) and its frequent release into the environment has caused many environmental and health problems. In this study the degradation of TCE at different micromolar concentrations was investigated in a stainless steel reactor with various concentrations of H2O2 and TiO2 at different oxygen pressures and three different pHs.
To examine the synergistic effect of under pressure oxygen on TCE degradation, the concentrations of H2O2 and TiO2 as well as pH were first optimized, and then the experiments were performed under optimal conditions. Gas chromatography with a flame ionization detector (FID) was used to measure TCE concentrations.
Results showed that the percentage of TCE degradation without pressurized oxygen was low and it increased with increasing pressure of oxygen at all initial concentrations of TCE. The degradation percentages without oxygen pressure were 48.27%, 51.22%, 58.13% and 64.33% for TCE concentrations of 3000, 1500, 300 and 150 μg/L respectively. At an oxygen pressure of 2.5 atmospheres (atm) the percent degradation of TCE reached 84.85%, 89.14%, 93.13% and 94.99% respectively for the aforementioned TCE concentrations.
The results of this study show that the application of dissolved oxygen under pressure increases the efficiency of the H2O2/TiO2 process on the degradation of TCE and can be used along with other oxidants as an effective method for the removal of this compound from aqueous solutions.
三氯乙烯（TCE）的广泛使用及其频繁的环境释放导致了许多环境和健康问题。在这项研究中，在不锈钢反应器中，以不同的氧压和三个不同的 pH 值，研究了不同微摩尔浓度的 TCE 在不同浓度的 H2O2 和 TiO2 下的降解情况。
为了考察加压氧对 TCE 降解的协同作用，首先优化了 H2O2 和 TiO2 的浓度以及 pH 值，然后在最佳条件下进行了实验。使用带火焰电离检测器（FID）的气相色谱法测量 TCE 浓度。
结果表明，在所有初始 TCE 浓度下，没有加压氧时 TCE 的降解率较低，随着氧压的增加而增加。没有氧气压力时，TCE 浓度为 3000、1500、300 和 150μg/L 时的降解率分别为 48.27%、51.22%、58.13%和 64.33%。在 2.5 个大气压的氧气压力下，TCE 的降解率分别达到 84.85%、89.14%、93.13%和 94.99%。
本研究结果表明，加压溶解氧的应用提高了 H2O2/TiO2 工艺对 TCE 降解的效率，并可与其他氧化剂一起作为从水溶液中去除该化合物的有效方法。
