Remediation of soils contaminated with trichloroethylene

• Autorzy: Albergaria J. T. , Alvim-Ferraz M. C. M. , Delerue-Matos C. M.
• Języki publikacji: EN

Abstrakty

EN

Soil contamination is a common problem in our society. Several activities introduce contaminants in soils affecting their quality and future utilization. In order to invert this situation and to avoid further spreading of the contaminant several remediation technologies could be used. For soils contaminated with trichloroethylene (TCE), Soil Vapor Extraction (SVE) can be an efficient remediation technology. It involves the application of vacuum to the soil matrix creating an airflow that conduce the volatized contaminant to extraction wells that lead them to the exterior of the soil where they are properly treated. This work presents the results obtained in the soil vapor experiments performed in a laboratory using soils with different water contents contaminated with TCE. These experiments aimed the study of the influence of soil water content and the airflow used in the remediation time and on the process efficiency. The results showed that in sandy soils contaminated with TCE: a) for similar levels of contamination, the increase of the soil water content from 0 to 4% created an increase of the concentration of TCE in the gas phase of the soil, in some cases by almost 50%; b) the influence of water content is not significant being overlapped by influence of the airflow rate; c) SVE performed with higher airflow rates had shorter remediation times (in some cases four times shorter) without any significant impact on the process efficiencies (fluctuations of 1 to 3%); and d) for the experimented soils, the utilization of higher airflow rates led to shorter and consequently cheaper remediation.

Słowa kluczowe

EN

airflow rate; soil vapor extraction; soil water content; trichloroethylene

PL

szybkość przepływu powietrza; desorpcja próżniowa; zanieczyszczenie; gleba; zawartość wody; trichloroetylen

• Wydawca: University of Warmia and Mazury in Olsztyn, Poland
• Czasopismo: Environmental Biotechnology
• Rocznik: 2010
• Tom: Vol. 6, No. 2
• Strony: 37--41
• Opis fizyczny: Bibliogr. 11 poz., rys., tab., wykr.

Twórcy

autor

Albergaria J. T.

autor

Alvim-Ferraz M. C. M.

autor

Delerue-Matos C. M.

• REQUIMTE, Instituto Superior de Engenharia do Porto, Rua Dr. António Bernardino de Almeida 431, 4200-072 Porto, Portugal,

Bibliografia

• Albergaria, J.T. 2003. Extraccão de Vapor para Remediacão de Solos - Controlo dos Parâmetros que Limitam a Descontaminacão. Master Thesis. Faculdade de Engenharia da Universidade do Porto, Porto.
• Albergaria, J.T., M.C.M. Alvim-Ferraz, C. Delerue-Matos. 2008. Soil vapor extraction in sandy soils: Influence of airflow rate. Chemosphere 73: 1557-1561.
• Alvim-Ferraz, M.C.M., J.T. Albergaria, C. Delerue-Matos. 2006. Soil remediation time to achieve clean-up goals: II: Influence of natural organic matter and water contents. Chemosphere 64: 817-825.
• Chai, J.C., N. Miura. 2004. Field vapor extraction test and longterm monitoring at a PCE contaminated site. Journal of Hazardous Materials 110: 85-92.
• Khan, F.I., T. Husain, R. Hejazi. 2004. An overview and analysis of site remediation technologies. Journal of Environmental Management 71: 95-122.
• Poulsen, T.G., P. Moldrup, T. Yamaguchi, P. Schjonning, J.A. Hansen. 1999. Predicting soil-water and soil-air transport properties and their effects on soil-vapour extraction efficiency. Ground Water Monitoring and Remediation 19: 61-70.
• Reddy, K.R., J.A. Adams. 2001. Effects of soil heterogeneity on airflow patterns and 300 hydrocarbon removal during in situ air sparging. Journal of Geotechnical and Geoenvironmental Engineering 127: 234-247.
• Soares, A.A., J.T. Albergaria, V.F. Domingues, M.C.M. Alvim-Ferraz, C. Delerue-Matos. 2010. Remediation of soils combining soil vapor extraction and bioremediation: Benzene. Chemosphere 80: 823-828.
• Suthersan, S.S. 1996. Soil vapour extraction. In: Remediation Engineering: Design Concepts, pp. 27-88. Boca Raton, Lewis Publisher Inc.
• United States Environmental Protection Agency (USEPA). 2007. Treatment technologies for site cleanup: Annual Status Report (Twelfth Edition). Retrieved September 15, 2009, from http://clu-in.org/asr/.
• Yoon, H., J.H. Kim, H.M. Liljestrand, J. Khim. 2002. Effect of water content on transient nonequilibrium NAPL-gas mass transfer during soil vapor extraction. Journal of Contaminant Hydrology 54: 1-18.