4.7 Article

Degradation of 1,2,3-trichloropropane by unactivated persulfate and the implications for groundwater remediation

期刊

SCIENCE OF THE TOTAL ENVIRONMENT
卷 865, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.scitotenv.2022.161201

关键词

Peroxydisulfate; Contaminated site; Soil remediation; In -situ chemical oxidation; Advanced oxidation process; Chlorinated hydrocarbon

向作者/读者索取更多资源

In this study, unactivated persulfate (PS) was found to degrade 1,2,3-TCP and generate reactive oxidation species (ROS) without an external activation system. Among the common oxidants tested, only unactivated PS was effective in degrading 1,2,3-TCP in both pure water and natural water samples. The degradation rate of 1,2,3-TCP increased with increasing PS concentration and temperature.
Persulfate (PS) is widely used as an in situ chemical oxidation (ISCO) technology for groundwater and soil remediation. While conventional theory generally assumes that PS needs to be activated to produce reactive radicals for pollutant degradation, herein, PS without explicit activation system was discovered for the degradation of 1,2,3-TCP with the generation of reactive oxidation species (ROS). Comparison of five common ISCO oxidants (PS, peroxymonosulfate, hydrogen peroxide, potassium permanganate, and sodium percarbonate) indicated that only unactivated PS was able to degrade 1,2,3-TCP in both pure water and 12 natural water samples. 50 mu M 1,2,3-TCP degradation can be continued as long as there is enough PS (50 mM). The degradation rate of 1,2,3-TCP increased 450 % when the PS concentration increased from 10 mM to 50 mM and 500 % when the temperature increased from 25 degrees C to 45 degrees C. Electron paramagnetic resonance (EPR) analyzes, hydroxyl radicals (center dot OH) probe reaction and radical quenching experiments confirmed the involvement of both sulfate radicals (SO4 center dot-) and center dot OH that were responsible for 1,2,3-TCP degradation and center dot OH played a more important role. HCO3-, Cl- and NOM are three groundwater matrix species that are most likely to inhibit PS oxidation of 1,2,3-TCP. Compared to activated PS, unactivated PS is more promising and more practical for groundwater remediation, since it has several advantages: (1) longer lifetime and better long-term availability; (2) ability of enduring contaminant degradation; (3) applicable for low-permeability zones remediation and potential to alleviate contaminant rebound or tailing problems; (4) environmental friendly; and (5) lower cost. Overall, results of this study show that unactivated PS is a promising in situ remediation technology that may be a good candidate for the most challenging low permeable zone remediation.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据