Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China; Key Laboratory of Soil Contamination Bioremediation of Zhejiang Province, School of Environmental & Resource Sciences, Zhejiang Agriculture and Forestry University, Hangzhou 311300, China; Jiangsu Engineering Laboratory for Soil and Groundwater Remediation of Contaminated Sites, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China.
Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China; Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing 210042, China.
Sci Total Environ. 2022 Feb 25;809:151929. doi: 10.1016/j.scitotenv.2021.151929. Epub 2021 Dec 7.
1,4-Dioxane degradation under both batch-scale and column experiments has been investigated within the biochar activated peroxymonosulfate (PMS) system for in-situ remediation of 1,4-dioxane contaminated groundwater. In case of the batch experiments, the 1,4-dioxane degradation efficiencies were significantly increased with the increased biochar pyrolysis temperatures. The optimized 1,4-dioxane degradation efficiency at 89.2% was achieved with 1.0 g L of biochar (E800) and 8.0 mM PMS. In the absence of PMS, the breakthrough rates of 1,4-dioxane in biochar packed column experiments under the dynamic flow conditions were relatively slow compared with those in sand packed columns. Simultaneously, based on the integrated areas (IA) from the 1,4-dioxane breakthrough curves, the degradation efficiency at 70.2% was estimated in biochar packed column (W:W = 1:9) under continuous injections of 16.0 mM PMS. Electron paramagnetic resonance (EPR) indicated that hydroxyl, sulfate and superoxide radicals were generated within the biochar/PMS systems and alcohol quenching experiments suggested that the dominated hydroxyl and sulfate radicals were responsible for 1,4-dioxane degradation. The findings of this study suggested that the biochar activated PMS system is a promising and cost-effective strategy for the remediation of 1,4-dioxane contaminated groundwater.
在生物炭激活过一硫酸盐（PMS）体系中，通过批实验和柱实验研究了 1,4-二恶烷的降解情况，该体系用于原位修复 1,4-二恶烷污染的地下水。在批实验中，随着生物炭热解温度的升高，1,4-二恶烷的降解效率显著提高。在 1.0 g L 的生物炭（E800）和 8.0 mM PMS 的条件下，1,4-二恶烷的降解效率达到了 89.2%的最优值。在没有 PMS 的情况下，在动态流动条件下，生物炭填充柱实验中 1,4-二恶烷的穿透速率与沙填充柱相比相对较慢。同时，根据 1,4-二恶烷穿透曲线的积分面积（IA），在连续注入 16.0 mM PMS 的情况下，在 W:W=1:9 的生物炭填充柱中，估计降解效率为 70.2%。电子顺磁共振（EPR）表明，在生物炭/PMS 体系中产生了羟基、硫酸根和超氧自由基，醇猝灭实验表明，主导的羟基和硫酸根自由基负责 1,4-二恶烷的降解。本研究的结果表明，生物炭激活过一硫酸盐体系是一种有前途的、具有成本效益的修复 1,4-二恶烷污染地下水的策略。
