土壤理化性质对TPH 污染土壤氧化修复的影响研究. (Chinese)

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 CaO 2 -like Fenton, activated Na 2 S 2 O8 and CaO 2 /Na 2 S 2 O8 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 CaO 2 /Na 2 S 2 O 8 composite oxidation system on soil TPH remediation was better than that of CaO 2 -like Fenton and activated Na 2 S 2 O 8 single oxidation system. [ABSTRACT FROM AUTHOR]

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 CaO 2 类芬顿、活化 Na 2 S 2 O 8 、CaO 2 /Na 2 S 2 O 8 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15000mg/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, CaO 2 /Na 2 S 2 O 8 复合氧化体系对土壤 TPH 修复效果优于 CaO 2 类芬顿、活化 Na 2 S 2 O 8 单一氧化体系。 [ABSTRACT FROM AUTHOR]

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