过硫酸盐
环境修复
环境化学
污染
硫黄
化学
土壤污染
硫酸盐
污染物
环境科学
环境工程
土壤水分
土壤科学
有机化学
催化作用
生态学
生物
作者
Long Ye,Zhenfang Wu,Xiaodong Ding,Jiansong Chen,Dongsheng Shen,Jiali Shentu,Hui Cheng
标识
DOI:10.1016/j.jes.2023.01.008
摘要
Persulfate is considered a convenient and efficient remediation agent for organic contaminated soil. However, the potential risk of sulfur into the soil remediation by persulfate remains ignored. In this study, glass bottles with different persulfate dosages and groundwater tables were set up to simulate persulfate remediation of organic pollutants (aniline). The results found sulfate to be the main end-product (83.0%‒99.5%) of persulfate remediation after 10 days. Moreover, H2S accounted for 93.4%‒99.4% of sulfur reduction end-products, suggesting that H2S was the final fate of sulfur. H2S was released rapidly after one to three days at a maximum concentration of 33.0 ppm, which is sufficient to make a person uncomfortable. According to the fitted curve results, H2S concentration decreased to a safe concentration (0.15 ppm) after 20‒85 days. Meanwhile, the maximum concentration of methanethiol reached 0.6 ppm. These results indicated that secondary pollution from persulfate remediation could release harmful gases over a long time. Therefore, persulfate should be used more carefully as a remediation agent for soil contamination.
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