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<p>Pentachlorophenol (PCP) contamination in soil poses severe environmental risks due to its persistence and toxicity. While various remediation technologies exist, efficient and cost-effective in-situ degradation remains a challenge. In this study, a persulfate (PS) oxidation system activated by calcium oxide (CaO/Lime) was employed to remediate PCP-contaminated soil at a chemical site. The specific inorganic and organic free radicals, primarily sulfate radicals (SO<sub>4</sub>⋅<sup>−</sup>) and hydroxyl radicals (⋅OH), generated by the alkaline activation of PS were utilized to degrade PCP. The effects of key operating parameters—reaction time, PS dosage, water content, and lime dosage-were systematically investigated using response surface methodology (RSM). The results demonstrated that under alkaline conditions (pH &gt; 12) maintained by CaO, a dosage of 0.25&#xa0;g sodium persulfate per 50&#xa0;g soil achieved a removal efficiency of 99.4% within 3 days, reducing PCP concentration from 1000.9&#xa0;mg/kg to 6.1&#xa0;mg/kg. The degradation mechanism involves the activation of PS by OH<sup>−</sup> released from lime, generating strong oxidizing radicals that dechlorinate and mineralize PCP. This study confirms that the lime-activated persulfate system is a promising, feasible strategy for the remediation of high-concentration organic contaminated sites.</p>

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Experimental study on soil contamination degradation of pentachlorophenol at a chemical site

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年2月25日

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  • Hengyong Zhang,
  • Yuqing Ren,
  • Xiaoyong Zuo,
  • Yexun Li,
  • Jinhui Miao,
  • Yeqin Xu,
  • Dongdong Wen,
  • Xiaopin Guo,
  • Rongbing Fu

摘要

Pentachlorophenol (PCP) contamination in soil poses severe environmental risks due to its persistence and toxicity. While various remediation technologies exist, efficient and cost-effective in-situ degradation remains a challenge. In this study, a persulfate (PS) oxidation system activated by calcium oxide (CaO/Lime) was employed to remediate PCP-contaminated soil at a chemical site. The specific inorganic and organic free radicals, primarily sulfate radicals (SO4⋅−) and hydroxyl radicals (⋅OH), generated by the alkaline activation of PS were utilized to degrade PCP. The effects of key operating parameters—reaction time, PS dosage, water content, and lime dosage-were systematically investigated using response surface methodology (RSM). The results demonstrated that under alkaline conditions (pH > 12) maintained by CaO, a dosage of 0.25 g sodium persulfate per 50 g soil achieved a removal efficiency of 99.4% within 3 days, reducing PCP concentration from 1000.9 mg/kg to 6.1 mg/kg. The degradation mechanism involves the activation of PS by OH− released from lime, generating strong oxidizing radicals that dechlorinate and mineralize PCP. This study confirms that the lime-activated persulfate system is a promising, feasible strategy for the remediation of high-concentration organic contaminated sites.