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硫酸根自由基高级氧化技术对污染场地多环芳烃的修复效果研究
徐源洲, 张力浩, 魏志敏, 张旭辉, 赵晨雨, 李辉信, 胡 锋, 徐 莉
南京农业大学资源与环境科学学院
摘要:
硫酸根自由基高级氧化技术(sulfate radical (SO42-) based advanced oxidation processes, SR-AOPs)是一种被广泛应用于降解土壤有机污染物的原位氧化修复技术。然而,关于SR-AOPs降解土壤多环芳烃(polycyclic aromatic hydrocarbons, PAHs)的报道相对较少。本研究以南京某炼钢厂附近土壤作为试验样本,通过设置不同比例混合体系的过硫酸钠(Na2S2O8)和亚铁离子(Fe2+)以及反应不同时间,探究SR-AOPs对土壤中16种PAHs的修复效果以及最佳技术方案。结果表明:Na2S2O8和Fe2+ 的配比会显著影响土壤PAHs的降解效果,当两者比例达到10:1时,即Na2S2O8用量为5 mmol/g,Fe2+ 用量为0.5 mmol/g,反应时间为24 h时,PAHs总降解率最高,可达到29.32%;不同环数的PAHs决定了SR-AOPs的降解效果,其中SR-AOPs对四环PAHs降解效率最高,总降解率达到37.32%;此外,降解效率随反应时间增加而增加,在24 h达到效果最佳。因此,本研究结果可为SR-AOPs修复土壤PAHs提供理论依据。
关键词:  硫酸根自由基  多环芳烃  污染场地  降解效率  修复
DOI:10.13758/j.cnki.tr.2020.03.016
分类号:X53
基金项目:中央高校基本科研业务费专项资金(KYZ201626)和国家自然科学基金项目(41101292)资助。
Effects of Sulfate Radical Advanced Oxidation Technology on PAHs Remediation in Contaminated Sites
XU Yuanzhou, ZHANG Lihao, WEI Zhimin, ZHANG Xuhui, ZHAO Chenyu, LI Huixin, HU Feng, XU Li
College of Resources and Environmental Sciences, Nanjing Agricultural University
Abstract:
Sulfate radical advanced oxidation processes (SR-AOPs) are promising in-situ chemical oxidation (ISCO) technologies for soil remediation with organic pollutants. However, few studies have explored the polycyclic aromatic hydrocarbons (PAHs) remediation by using SR-AOPs. In this study, soil samples were collected from the steel mills in Nanjing, and the different ratios of Na2S2O8 and Fe2+ and degradation time were investigated to degradation efficiencies of 16 PAHs in soil. The results showed that the ratios of Na2S2O8 and Fe2+ could significantly impact on the degradation efficiencies, degradation efficiencies reached the optimum efficiency 29.32% when the Na2S2O8 : Fe2+ = 10:1 during 24 h reaction. Besides, the ring of PAHs plays a key role in degradation efficiency by using SR-AOPs technologies, and the tetracyclic PAHs had the highest degradation rate of 37.32% than others. Furthermore, degradation efficiency was increased with increasing reaction time, and the highest degradation efficiency under 24 h reaction was found. These factors should be considered when using SR-AOPs in PAHs remediation in soil.
Key words:  Sulfate free radical  PAHs  Contaminated sites  Degradation efficiency  Remediation

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