| 摘要: |
| 目的 为探究土壤理化性质对总石油烃(TPH)污染土壤氧化修复效果的影响,进而寻求针对TPH污染土壤的高效氧化体系。方法 选用西南地区紫色土分别配制不同土壤有机质含量、粒径、阳离子交换量的TPH污染土壤,选取CaO2类芬顿、活化Na2S2O8、CaO2/Na2S2O8复合氧化体系,以各自最优氧化条件在室温25 ℃的条件下进行氧化实验,考查土壤理化性质对土壤TPH负载能力及氧化修复效果的影响。结果 在TPH投加量均为15 000 mg/kg的条件下,土壤TPH负载能力与土壤有机质含量、阳离子交换量呈正相关,与土壤粒径呈负相关,其影响程度为:有机质含量＞粒径＞阳离子交换量；土壤TPH降解率与土壤有机质含量、阳离子交换量及粒径皆呈负相关,其影响程度为:粒径＞有机质含量＞阳离子交换量。结论 在各体系最优氧化条件下,CaO2/Na2S2O8复合氧化体系对土壤TPH修复效果优于CaO2类芬顿、活化Na2S2O8单一氧化体系。 |
| 关键词: TPH污染土壤 氧化修复 过氧化钙 过硫酸钠 降解率 |
| DOI：10.3969/j.issn.1007-3426.2022.06.021 |
| 分类号: |
| 基金项目: |
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| Effects of soil physical and chemical properties on oxidative remediation of TPH contaminated soils |
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Chen Yukun1, Hu Rong1, Shi Qiuping2, Lei Ye3, Tang Hong3, Huang Wenzhang1
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1. School of Chemistry and Chemical Engineering, Chongqing University of Science and Technology, Chongqing, China;2. Chongqing Wansheng Economic Development Zone Ecological Environment Monitoring Station, Chongqing, China;3. Chongqing Yukeyuan Environmental Protection Technology Co., Ltd., Chongqing, China
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| Abstract: |
| Objective The aim of this study is to explore the effect of soil physical and chemical properties on TPH-contaminated soil oxidative remediation so as to sought the efficient oxidation system. Methods The purple soil in southwest China was selected to prepare TPH-contaminated soil with different soil organic matter contents, particle size, and cation exchange capacity. The CaO2-like Fenton, activated Na2S2O8 and CaO2/Na2S2O8 composite oxidation system were adopted to conduct oxidation experiments at room temperature of 25 ℃ under the optimal oxidation conditions respectively. The effects of soil physical and chemical properties on soil TPH loading capacity and oxidative remediation were investigated. Results The results showed that when the TPH dosage was 15 000 mg/kg, the soil TPH loading capacity was positively correlated with soil organic matter content and cation exchange capacity, but negatively correlated with soil particle size. The influence degree was organic matter content > particle size > cation exchange capacity. The degradation rate of soil TPH was negatively correlated with soil organic matter content, cation exchange capacity,and particle size while the influence degree was particle size > organic matter content > cation exchange capacity. Conclusion Under the optimal oxidation conditions, the effect of CaO2/Na2S2O8 composite oxidation system on soil TPH remediation was better than that of CaO2-like Fenton and activated Na2S2O8 single oxidation system. |
| Key words: TPH-contaminated soil oxidative remediation calcium peroxide sodium persulfate degradation rate |
