Abstract:

Thermally enhanced soil vapor extraction combined with bioventing(TSVE-BV) is a promising technology for the in-situ remediation of soils contaminated by petroleum hydrocarbon. In this study, based on two lab-scale devices, a series of experiments were conducted to evaluate the removal efficiency of light and heavy petroleum hydrocarbon using seveval technologies including SVE, TSVE, BV and TSVE-BV. The results indicated that SVE and TSVE showed a good performance in treating light petroleum hydrocarbon, but had a relatively limited performance in treating heavy petroleum hydrocarbon with more than 13 carbon atoms(C₁₃) in it. And TSVE-BV technology could achieve a higher removal efficiency in shorter time. According to the experimental results, C₁₃ was choosed to connect the TSVE and BV. Based on the experimental data, a pilot-scale equipment was constructed and used in a gas station's remediation. The TPH concentration in the site was much lower than the risk screening value in the national standard and the contaminant removal rate reached 96%, which proved that TSVE-BV is an efficient and green remedy approach.

Key words: petroleum hydrocarbon, contaminated site, soil vapor extraction, bioventing, combined remediation, gas station, contaminant removal rate

摘要：

热强化气相抽提(TSVE)-微生物降解(BV)耦合技术对石油烃污染土壤原位修复潜力巨大。通过实验模拟装置，考察常规气相抽提(SVE)、TSVE、BV及TSVE-BV耦合技术对轻组分和重组分石油烃的去除效果，结果表明气相抽提和热强化抽提对轻组分石油烃去除效果较好，对C₁₃以上的石油烃去除效果有限，TSVE-BV耦合方式可在更短时间内实现更高的污染物去除率。根据实验结果，将C₁₃作为TSVE与BV的耦合点，开发TSVE-BV修复装置，在某加油站进行示范修复，总石油烃(TPH)浓度远低于国标要求，污染物去除率高达96%,表明该耦合修复技术可以实现污染场地的高效修复。

关键词: 石油烃, 污染场地, 气相抽提, 微生物降解, 耦合修复, 加油站, 污染物去除率