Application of Supercritical Fluid Extraction (SFE) to Predict Bioremediation Efficacy of Long-Term Composting of PAH-Contaminated Soil

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• 作者：Tomá ; <img src="http ; //pubs.acs.org/images/entities/scaron.gif" border="0"> Cajthaml and Vá ; clav <img src="http ; //pubs.acs.org/images/entities/Scaron.gif" border="0">a<img src="http ; //pubs.
• 刊名：Environmental Science & Technology
• 出版年：2005
• 出版时间：November 1, 2005
• 年：2005
• 卷：39
• 期：21
• 页码：8448 - 8452
• 全文大小：175K
• 年卷期：v.39,no.21(November 1, 2005)
• ISSN：1520-5851

文摘

Supercritical fluid extraction (SFE) with pure carbondioxide was used to obtain desorption curves of PAHsfrom four contaminated industrial soils. Total PAHconcentrations ranged from 1495 to 2439 mg/kg. Thedesorption curves were fitted with a simple two-site modelto determine the rapidly released fraction (F) representingbioavailability of PAHs. The F data obtained undervarious SFE pressures were compared with degradationresults of a composting method applied on the soils. Aftercomposting and consequent long-term maturation, theresidual PAH contaminations ranged from 4 to 36% of theoriginal values. A possible explanation of the resultvariations is the different bioavailability of the pollutants.The best correlations between degradation results and Ffraction were obtained applying 50 <IMG SRC="/images/entities/deg.gif">C and 300 bar. The Fvalues gave very good agreement with degradationefficiencies and the total regression coefficients (r²) rangedfrom 0.81 to 0.99. The degradation results together withbioavailable fractions appeared to be consistent with organiccarbon contents in the soils and with volatile fractionsof organics. The results indicate that SFE could be a rapidtest to predict bioremediation results of composting of PAH-contaminated soils.