不同氧化体系去除污染土壤中多环芳烃的对比研究

采用类Fenton(芬顿)、高锰酸钾、过硫酸钠3种氧化体系去除污染土壤中的多环芳烃(PAHs),在最优实验因素配比条件下,其对污染土壤中PAHs的最高去除率分别为96.5%、94.0%和95.6%。在此基础上,进一步开展放大反应,改变水土质量比为0.6∶1,反应温度为25 ℃,3种氧化体系对PAHs的最高去除率分别为63.2%、72.1%和70.8%。以化学计量的氧化剂需求指数(SOD)评价3种氧化体系对PAHs的氧化效率,结果表明,高锰酸钾体系的氧化效率最高。由经济核算可知,高锰酸钾体系在实验条件下对PAHs污染土壤的修复成本最低。

Comparative study on polycyclic aromatic hydrocarbons removal from contaminated soil using different oxidation systems

Fenton-like, potassium permanganate and sodium persulfate oxidation systems were used to remove polycyclic aromatic hydrocarbons (PAHs) from contaminated soil. Under the best experimental factors combinations, the maximum PAHs removal rate of these three systems was 96.5%, 94.0% and 95.6%, respectively. On the basis, amplification reactions of the above three systems were carried out in drum reactor with weight ratio of water to soil of 0.6∶1, temperature of 25 ℃,and the removal rates were 63.2%, 72.1% and 70.8%, accordingly. Stoichiometric oxidant demand (SOD) was introduced to evaluate the oxidation efficiency of these systems, and it was shown that the oxidation efficiency of potassium permanganate was higher than the others. In addition, the economic costs of potassium permanganate was the smallest to remove PAHs from contaminated soils under the experimental conditions.