1. College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China 2. Hangzhou Bo Sheng Environmental Science and Technology Co. Ltd, Hangzhou 310014, China
The soil polluted by polycyclic aromatic hydrocarbons (PAHs) was taken as test samples, and four types of chemical oxidants were applied to remove 16 PAHs from the soil. Their degradation effects were compared to select the most effective oxidant to remove 16 PAHs, and then optimize the oxidation conditions for this oxidant. Based on the results, potassium permanganate, activated sodium persulfate, modified Fenton, and hydrogen peroxide proved to be effective for degrading PAHs, and the degradation rate was 94.06%, 82.79%, 81.15% and 72.91%, respectively. Specifically, potassium permanganate showed remarkable improvement in degradation efficiency compared with other oxidants. The degradation rate of potassium permanganate for each PAH was more than 80%, and the residual PAHs contents in soil were below the standard limit values. What’s more, the best remediation performance of potassium permanganate achieved 95.96% with oxidant dosage of 2.5 mols per 1 kg soil, liquid/solid ratio of 7.5, and the contact time of 48 h. The chemical oxidants are availible to degrade PAHs efficiently from contaminated soil, and potassium permanganate appears to have great prospects of application to degrade PAHs for its best performance on PAHs degradation.
Qian CHEN,Wu CAI,Jie CHEN,Hu-biao ZHAO,Chang-xin LI,Yun-feng HE. Degradation effects of different chemical oxidants on polycyclic aromatic hydrocarbons in soil. Journal of ZheJiang University (Engineering Science), 2019, 53(12): 2437-2444.
Tab.2Bench scale oxidation tests: dosages and reactants
Fig.1Degradation efficiency of different oxidants on PAHs
Fig.2Comparison for optimal degradation efficiency of four oxidants on 16 PAHs
土壤来源
wB /10?6
氧化剂
X/（mol·kg?1）
Ψ/%
R
t/h
实验方法
钢铁厂
66.47
双氧水
4.0
72.91
5
24
本实验
改性Fenton
5.0
81.15
活化过硫酸钠
5.0
82.79
高锰酸钾
2.0
94.06
沉积物 （煤焦油废水污染）
2 816
双氧水
3.3
96
10/3
至反应结束
文献[8]
改性Fenton
1.7
98
活化过硫酸钠
1.7
88
高锰酸钾
3.3
96
焦化厂
189.0
双氧水
2.0
53
5
24
文献[11]
类Fenton
2.0
80
活化过硫酸钠
4.0
92
高锰酸钾
1.5、2.0
96
工业港口底泥
4.226
改性Fendon
1.25
68.3
25
24
文献[12]
高锰酸钾
26.9
72.8
Tab.3Comparison for degradation effects of different oxidants on 16 PAHs under different conditions
Fig.3Comparison for degradation efficiency of KMnO4 on 16 PAHs under four types of fixed oxidant additions with different liquid/soild ratios
Fig.4Degradation efficiency of KMnO4 on 16 PAHs with different contact time
参数
R
X
t
注：*表示在 0.05 层上显著（双尾），**表示在 0.01 层上显著（双尾）
Ψ的相关系数
?0.033
0.463*
0.630**
Ψ的显著性（双尾）
0.875
0.029
0.004
Tab.4Correlation analysis of degradation conditions and degradation efficiency of KMnO4
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