优化SO4-·高级氧化技术修复PAHs复合污染土壤

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Abstract

Sulfate radical-based advanced oxidation processes (SR-AOPs)was used to remediate PAHs contaminated soils near a steel mill in Nanjing. The ratio of sodium persulfate (Na₂S₂O₈) and ferrous ion (Fe²⁺) used in the SR-AOPs was adjusted, combined with various types and concentrations of chelating agents and surfactants, to reach the best PAHs removal efficiency. Meanwhile, the degradation characteristics of different types of PAHs were analyzed. The results showed that the ratio of Na₂S₂O₈ and Fe²⁺ significantly influenced the PAHs degradation efficiencies. The highest removal rate of PAHs was 29.32% at the condition of 24hours incubation when the ratio of Na₂S₂O₈ and Fe²⁺ was 10:1, i.e. the dose of Na₂S₂O₈ was 5mmol/g and the Fe²⁺ dosage was 0.5mmol/g. Base on this, 0.5mmol/g citric acid was added as the best chelating agent which could further improve the PAHs removal rate to 49.9%. In addition, 0.27mg/g surfactant IGEPAL CA-720 could also increase the PAHs removal rate to 80.8%. In general, the tetracyclic PAHs showed the highest removal rate by SR-AOPs. The addition of citric acid and IGEPAL CA-720 could further promote the removal of tricyclic PAHs and pentacyclic PAHs in soil. In conclusion, the citric acid and IGEPAL CA-720 addition could help to facilitate the removal of PAHs in soils, especially for the high-ring PAHs.

Key words： sulfate free radical PAHs contaminated site degradation efficiency remediation

Received: 29 August 2019

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X53

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	Articles by authors
	XU Yuan-zhou
	ZHANG Li-hao
	FANG Cheng
	DAI Zi-wen
	WEI Zhi-min
	LI Hui-xin
	HU Feng
	XU Li

Cite this article:

XU Yuan-zhou,ZHANG Li-hao,FANG Cheng等. Optimization of sulfate radical advanced oxidation technology on PAHs remediation in contaminated sites[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(3): 1183-1190.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I3/1183

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