REMEDIATION EFFICIENCY OF HIGH-RING POLYCYCLIC AROMATIC HYDROCARBONS IN COKING CONTAMINATED SOIL BY USING POTASSIUM PERMANGANATE
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摘要: 为了探究高锰酸钾(KMnO4)对焦化场地多环芳烃(PAHs)污染土壤的修复效果,以安徽合肥某PAHs污染土壤为实验对象,研究了KMnO4投加浓度、反应时间和液固比等因素影响下KMnO4对土壤高环PAHs的修复效果。结果表明:1)随着KMnO4浓度的增加,PAHs去除率随之增加,当KMnO4浓度为0.13 mmol/g时,ΣPAHs含量由污染原土的300.15 mg/kg下降至55.80 mg/kg,ΣPAHs去除率为81.41%,其中苯并[a]芘去除率高达97.06%;2)ΣPAHs去除率随着反应时间的延长而显著增加,反应2 h时ΣPAHs含量为64.33 mg/kg,去除率为78.57%,当反应时间延伸至48 h时,去除率增加至85.65%;3)不同液固比时 KMnO4对PAHs的去除率影响不大;4)由响应面分析可知,KMnO4浓度为0.21 mmol/g、反应时间32.50 h、液固比1∶1时,ΣPAHs去除率最高,为87.62%;5)KMnO4能够直接参与氧化PAHs或者通过副产物MnO2间接参与氧化PAHs,将高环PAHs转化为低环PAHs或多种中间体,并进一步分解为CO2和H2O。
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关键词:
- 焦化场地 /
- 多环芳烃(PAHs) /
- 高锰酸钾(KMnO4) /
- 响应面分析
Abstract: In order to investigate the remediation of polycyclic aromatic hydrocarbons (PAHs) in coking-contaminated soils by using potassium permanganate (KMnO4) as the oxidant, PAHs contaminated soil in Hefei, Anhui province was taken as the experimental object. Effects of environmental factors including KMnO4 concentration, reaction time and liquid-solid ratio were determined accordingly. The results showed that: 1) with the increase of KMnO4 concentration, the removal efficiency of PAHs improved. The content of total PAHs decreased from 300.15 mg/kg to 55.80 mg/kg when KMnO4 concentration was 0.13 mmol/g, the removal efficiency of total PAHs and benzo [a] pyrene was 81.41% and 97.06%, respectively; 2) the removal efficiency of PAHs significantly increased with the prolongation of reaction time, and after 2 h of reaction, the content of total PAHs was 64.33 mg/kg, with a removal efficiency of 78.57%. When the reaction time was extended to 48 h, the removal efficiency increased to 85.65%; 3) the removal efficiency of PAHs was not significantly affected at different liquid-solid ratios; 4) response surface analysis showed that the removal efficiency of total PAHs reached the peak at 87.62% when the concentration of KMnO4 was 0.21 mmol/g, the reaction time was 32.50 h and the liquid-solid ratio was 1∶1; 5) KMnO4 can directly participate in the oxidation of PAHs or indirectly participate in the oxidation of PAHs through by-product MnO2, and convert high-ring PAHs into low-ring PAHs or various intermediates, and further decompose them into CO2 and H2O. -
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