CaO活化过硫酸盐对土壤中五氯酚的去除研究

Removal of Pentachlorophenol in Soil by CaO Activated Persulfate

文章研究了CaO对过硫酸盐(PS)处理五氯酚(PCP)污染土壤的促进作用。结果表明,提高PS浓度和CaO添加量可促进CaO/PS体系中PCP的去除,而随着液固比的增加,PCP的去除效果呈现出先增强后减弱的趋势。CaO水解可提供OH-,同时释放热量,但其对土壤体系的温度提升程度与液固比成反比,相较于其实现的热活化氧化能力,传质过程的抑制对PCP氧化去除的影响更大。响应曲面优化分析结果表明,PS剂量、CaO添加量和液固比均对土壤中PCP去除具有显著影响,三因素对PCP去除的影响程度次序为PS剂量>CaO添加量>液固比。研究结果可为五氯酚污染场地修复处理的实际工程应用提供理论指导。

The promotion effect of CaO on persulfate(PS)treatment of actual pentachlorophenol(PCP)contaminated soil was studied.The results showed that the hydrolysis of CaO could generate OH-and release heat,achieving the combined alkali-heat activation of PS and the oxidative removal of PCP.The results of the response surface methodology showed that the removal efficiency of PCP was significantly affected by the dosage of PS,the ratio of liquid to solid and the dosage of CaO.The influence degrees of the three factors on PCP removal efficiency were in the order of PS dosage>Ca O dosage>liquidsolid ratio.Increasing the concentration of PS and the dosage of CaO,the removal of PCP was promoted,and with the increase of the liquid-solid ratio,the removal efficiency of PCP showed a trend of enhancing first and then weakening.The research results can provide theoretical guidance for the remediation of actual PCP contaminated sites.