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Sequential Application of Soil Vapor Extraction and Bioremediation Processes for the Remediation of Ethylbenzene-Contaminated Soils |
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| Authors: | António Alves Soares Maria Teresa Pinho José Tomás Albergaria Valentina Domingues Maria da Concei??o M Alvim-Ferraz Paolo De Marco Cristina Delerue-Matos |
| Institution: | 1. Requimte, Instituto Superior de Engenharia, Instituto Polit??cnico do Porto, Rua Dr. Ant??nio Bernardino de Almeida 431, 4200-072, Porto, Portugal 4. Department of Agroecology, Faculty of Science and Technology, Aarhus University, Blichers All?? 20, P.O. Box 50, 8830, Tjele, Denmark 2. LEPAE, Departamento de Engenharia Qu??mica, Faculdade de Engenharia da Universidade do Porto, R. Dr. Roberto Frias, 4200-465, Porto, Portugal 3. Centro de Investiga??o em Ci??ncias da Sa??de (CICS), Instituto Superior de Ci??ncias da Sa??de-Norte, CESPU, Gandra, Portugal |
| Abstract: | Soil vapor extraction (SVE) is an efficient, well-known and widely applied soil remediation technology. However, under certain conditions it cannot achieve the defined cleanup goals, requiring further treatment, for example, through bioremediation (BR). The sequential application of these technologies is presented as a valid option but is not yet entirely studied. This work presents the study of the remediation of ethylbenzene (EB)-contaminated soils, with different soil water and natural organic matter (NOMC) contents, using sequential SVE and BR. The obtained results allow the conclusion that: (1) SVE was sufficient to reach the cleanup goals in 63% of the experiments (all the soils with NOMC below 4%), (2) higher NOMCs led to longer SVE remediation times, (3) BR showed to be a possible and cost-effective option when EB concentrations were lower than 335?mg?kg soil ?1 , and (4) concentrations of EB above 438?mg?kg soil ?1 showed to be inhibitory for microbial activity. |
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