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首页> 外文期刊>African Journal of Biotechnology >Kinetic and degradation efficiency of trichloroethylene (TCE) via photochemical process from contaminated water
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Kinetic and degradation efficiency of trichloroethylene (TCE) via photochemical process from contaminated water

机译：污水中三氯乙烯（TCE）的光化学过程动力学和降解效率

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Trichloroethylene (TCE) is a common pollutant in groundwater and one of the priority pollutants listed by the U.S. EPA. With regard to concentration ranges in previous studies exceeding environmental levels by far with millimolar concentrations of TCE, this study deals with the degradation of TCE at micromolar concentrations by UV/H2O2. The degradation rate of TCE at different dilute solution levels, 30, 300 and 3000?mg L-1?(0.22, 2.28 and 22.83 micromolar) at different initial pHs was examined. In addition, samples were taken from four contaminated wells to measure the degradation rate of TCE. It was shown that the?degradation rate of TCE increased due to the reduction of initial concentration in both aqueous solution and groundwater samples.?The TCE degradation constants in?groundwater?samples increased by a factor of 2.05, while the initial concentration reduced from 1345.7 to 97.7 μg1 L-1.?By increasing the molar ratios of H2O2?to TCE from 13 to 129, caused the degradation rates to increase in aqueous solutions. No harmful byproducts such as?haloacetic acids (HAAs)?were detected at these low levels of initial concentration of TCE during process. This study confirmed that application of UV/H2O2?process could be an effective method in treating contaminated groundwater by TCE at low concentrations.
机译：三氯乙烯（TCE）是地下水中的常见污染物，也是美国EPA列出的优先污染物之一。关于先前研究中的浓度范围远远超过环境水平（以三氯乙烯的毫摩尔浓度计），该研究处理了紫外线/过氧化氢在微摩尔浓度下三氯乙烯的降解。考察了在不同的初始pH下，TCE在30、300和3000？mg L-1？（0.22、2.28和22.83微摩尔）的不同稀释溶液水平下的降解速率。另外，从四个受污染的孔中取样以测量TCE的降解率。结果表明，TCE的降解速率由于水溶液和地下水样品中初始浓度的降低而增加。地下水样品中的TCE降解常数增加了2.05倍，而初始浓度从1345.7降低了通过将H 2 O 2与TCE的摩尔比从13增加到129，使水溶液中的降解速率增加。在此过程中，TCE的初始浓度低时，未检测到有害的副产物，例如“卤乙酸（HAA）”。这项研究证实，紫外线/过氧化氢工艺的应用可能是低浓度三氯乙烯处理低浓度地下水的有效方法。

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