Screening and Remediation Test of Soil Odor in an Organic Contaminated Site
The Volatile Organic Compounds(VOCs)in the soil odors produced from an organic contaminated site were determined by purge and trap/gas chromatography-mass spectrometry.The results showed that the main source of odor was 2-chlorotoluene.The odor treatment and remediation tests were carried out by four methods including natural volatilization,calcium oxide assisted heating and volatilization,hydrogen peroxide oxidation and sodium persulfate/calcium oxide oxidation.The results indicated that the odor removal rate by natural volatilization could reach more than 90%at room temperature,while the other three methods could improve the removal rate to a certain extent(4%～7%).But 2-chlorotoluene was difficult to be completely degraded by oxidation reaction and o-chlorobenzaldehyde was generated.Therefore,in-situ agitation and gas gathering or in-situ natural volatilization treatment was recommended to treat the odor,and on-site coverage or deodorization technology was used to prevent and control odor escape and secondary pollution during site excavation.
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