Remediation of crude oil-contaminated soil by bioventing and composting technology
生物通风堆肥法修复原油污染土壤的实验研究

Bioventing and microbial composting were used in the laboratory to simulate the remediation of crude oil-contaminated soil collected from the Jilin oil field.The contaminant removal paths and mechanism are discussed.The results showed that both of these methods were effective in the remediation process.After 40 days,45% of the crude oil was removed from the soil,given an original oil content of 7.00×104 mg·kg-1.The rate constant of biodegradation and half life were 0.0333 d-1 and 20.82 d,respectively.Biodegradation was the main method of contaminant removal.Volatilization loss of crude oil was less than 0.1% of the initial crude oil content.Among the three tested ratios of contaminated soil to organic fertilizer(dry weight)of 8:2,7:3 and 5:5,the highest removal of crude oil was observed at a ratio of 7:3,in which the removal by complete biodegradation reached 17% of the total.Biodegradation of the oil contaminants was shown by the change of crude oil components.Linear relationships were found between the rate of crude oil biodegradation and the amount of CO2 produced.The rate and degree of biodegradation were highly related to the number and activity of bacteria.