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Title: Application of supercritical fluid extraction (SFE) to predict bioremediation efficacy of long-term composting of PAH-contaminated soil

Abstract

Supercritical fluid extraction (SFE) with pure carbon dioxide was used to obtain desorption curves of PAHs from four contaminated industrial soils. These were from a former gas works, a former tar processing plant, a former wood presentation plant, and a former gas-holder site. Total PAH concentrations ranged from 1495 to 2439 mg/kg. The desorption curves were fitted with a simple two-site model to determine the rapidly released fraction (F) representing bioavailability of PAHs. The F data obtained under various SFE pressures were compared with degradation results of a composting method applied on the soils. After composting and consequent long-term maturation, the residual PAH contaminations ranged from 4 to 36% of the original values. A possible explanation of the result variations is the different bioavailability of the pollutants. The best correlations between degradation results and F fraction were obtained applying 50{sup o}C and 300 bar. The F values gave very good agreement with degradation efficiencies and the total regression coefficients (r{sup 2}) ranged from 0.81 to 0.99. The degradation results together with bioavailable fractions appeared to be consistent with organic carbon contents in the soils and with volatile fractions of organics. The results indicate that SFE could be a rapid testmore » to predict bioremediation results of composting of PAH-contaminated soils. 23 refs., 2 figs., 3 tabs.« less

Authors:
;  [1]
  1. Academy of Sciences of the Czech Republic, Prague (Czech Republic). Institute of Microbiology
Publication Date:
OSTI Identifier:
20681280
Resource Type:
Journal Article
Journal Name:
Environmental Science and Technology
Additional Journal Information:
Journal Volume: 39; Journal Issue: 21; Other Information: cajthaml@biomed.cas.cz; Journal ID: ISSN 0013-936X
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 01 COAL, LIGNITE, AND PEAT; SOILS; DECONTAMINATION; POLYCYCLIC AROMATIC HYDROCARBONS; SUPERCRITICAL GAS EXTRACTION; CARBON DIOXIDE; DESORPTION; INDUSTRIAL PLANTS; TOWN GAS; COAL GASIFICATION PLANTS; BIOLOGICAL AVAILABILITY; COMPOSTING; REMEDIAL ACTION

Citation Formats

Cajthaml, Toma, and Sasek, Vaclav. Application of supercritical fluid extraction (SFE) to predict bioremediation efficacy of long-term composting of PAH-contaminated soil. United States: N. p., 2005. Web. doi:10.1021/es050023j.
Cajthaml, Toma, & Sasek, Vaclav. Application of supercritical fluid extraction (SFE) to predict bioremediation efficacy of long-term composting of PAH-contaminated soil. United States. doi:10.1021/es050023j.
Cajthaml, Toma, and Sasek, Vaclav. Tue . "Application of supercritical fluid extraction (SFE) to predict bioremediation efficacy of long-term composting of PAH-contaminated soil". United States. doi:10.1021/es050023j.
@article{osti_20681280,
title = {Application of supercritical fluid extraction (SFE) to predict bioremediation efficacy of long-term composting of PAH-contaminated soil},
author = {Cajthaml, Toma and Sasek, Vaclav},
abstractNote = {Supercritical fluid extraction (SFE) with pure carbon dioxide was used to obtain desorption curves of PAHs from four contaminated industrial soils. These were from a former gas works, a former tar processing plant, a former wood presentation plant, and a former gas-holder site. Total PAH concentrations ranged from 1495 to 2439 mg/kg. The desorption curves were fitted with a simple two-site model to determine the rapidly released fraction (F) representing bioavailability of PAHs. The F data obtained under various SFE pressures were compared with degradation results of a composting method applied on the soils. After composting and consequent long-term maturation, the residual PAH contaminations ranged from 4 to 36% of the original values. A possible explanation of the result variations is the different bioavailability of the pollutants. The best correlations between degradation results and F fraction were obtained applying 50{sup o}C and 300 bar. The F values gave very good agreement with degradation efficiencies and the total regression coefficients (r{sup 2}) ranged from 0.81 to 0.99. The degradation results together with bioavailable fractions appeared to be consistent with organic carbon contents in the soils and with volatile fractions of organics. The results indicate that SFE could be a rapid test to predict bioremediation results of composting of PAH-contaminated soils. 23 refs., 2 figs., 3 tabs.},
doi = {10.1021/es050023j},
journal = {Environmental Science and Technology},
issn = {0013-936X},
number = 21,
volume = 39,
place = {United States},
year = {2005},
month = {11}
}