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Integrated air stripping and biofiltration for remediation of soils contaminated by organic compounds
Author(s) -
Massabò Marco,
Nicolella Cristiano,
Zilli Mario
Publication year - 2007
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.1697
Subject(s) - biofilter , environmental remediation , stripping (fiber) , soil water , air stripping , contamination , environmental chemistry , chemistry , degradation (telecommunications) , pollutant , air stream , environmental science , soil contamination , soil vapor extraction , environmental engineering , soil science , materials science , ecology , telecommunications , organic chemistry , wastewater , computer science , composite material , biology
This paper presents the results of a laboratory scale investigation on the remediation of a soil contaminated by a mixture of organic compounds using a two‐step process consisting of stripping and biofiltration. The biofilter was packed with the soil under examination in order to use autochthonous microorganisms. To assess the effects of both temperature and superficial velocity of the air stream on process performance different sets of experimental tests were carried out at two air temperatures (50 and 80 °C), and at two superficial air velocities (41.0 and 82.0 m h −1 ), corresponding to apparent air residence times in the biofilter column of 38 and 19 s respectively. The stripping rate proves to be inversely correlated with the soil–water partitioning coefficient, while no evident correlation was found with the Henry coefficient. It can therefore be concluded that soil–water partitioning is limited by mass transfer while air–water partitioning reaches equilibrium. Temperature influences both stripping rate in the stripping column and degradation capacity in the biofilter. A stripping temperature of 80 °C combined with a biofiltration temperature of 34 °C provides the best process performance. Copyright © 2007 Society of Chemical Industry