某工业地块有机污染场地土壤修复方案设计

Design of a Soil Remediation Scheme for an Organically Contaminated Industrial Site

摘要: 针对某典型工业地块土壤多环芳烃(PAHs)污染问题，研究基于前期土壤污染状况调查与风险评估，明确了修复范围、修复方量及修复目标值。经修复技术比选，选定异位化学氧化工艺作为修复工艺，结合污染空间分布特征，分别选取低浓度、高浓度的PAHs污染土壤开展小试实验，系统探究过硫酸钠(Na₂S₂O₈)氧化剂与氧化钙(CaO)活化剂在不同浓度梯度下对PAHs的去除效果，以确定实现修复目标的最佳药剂配比与投加参数。基于小试结果形成了系统、经济的场地修复方案，为同类工业污染地块的治理提供了技术支撑和工程参考。

Abstract: This study addresses polycyclic aromatic hydrocarbon (PAHs) contamination in a typical industrial site. Based on preliminary soil contamination investigation and risk assessment, the remediation scope, volume, and target values were delineated. Ex-situ chemical oxidation was selected as the remedial technology through comparative technical evaluation. According to the spatial distribution characteristics of contaminants, bench-scale experiments were conducted using low- and high-concentration PAH-contaminated soils, respectively. The removal efficiency of PAHs by sodium persulfate (Na₂S₂O₈) oxidant and calcium oxide (CaO) activator was systematically investigated under varying concentration gradients to optimize reagent dosage ratios and application parameters for achieving remediation targets. A systematic and cost-effective site remediation scheme was developed based on the bench-scale results, providing technical support and engineering reference for the remediation of analogous industrial contaminated sites.