Start-up and performance characteristics of a trickle bed reactor degrading toluene

Abstract

ABSTRACT

Biofiltration of volatile organic compounds of Brazilian gasoline

“…For higher gasoline concentrations at the inlet air, a longer period of time was required until the biofilter systems achieved a good microbial acclimatization and an improvement in the removal efficiency. Misiaczek et al (2007), studying the degradation of toluene in a trickle bed reactor with a constant inlet concentration of 100 mg.m -3 , achieved stable removal efficiency above 95% after a week of operation showing that lower pollutants concentration could be degraded much easier and much faster than higher concentration, even if they needed a time of acclimatization. Soares (2006) reported efficiencies of 90 to 100% for 2 g.m -3 using one biofilter of compost and one of tire to treat A gasoline.…”

Design and Performance of a Toluene-Degrading Differential Biotrickling Filter as an Alternative Research Tool to Column Reactors

“…When bed thickness was 50 mm, the maximum EC demonstrated by the DBTF for multiple days (430 g/m 3 h) was 7 times higher than that of the column reactor (57 g/m 3 h) and up to 38 times higher than the typical EC (approximately 11 -300 g/m 3 h) in most reports (Misiaczek et al 2007, Weber and Hartmans 1996, Chen et al 2012, Cox et al 1998, Cox and Deshusses 2002, Cox and Deshusses 1999, Singh et al 2010, Chang and Lu 2003, He et al 2009, Lebrero et al 2012, Sun et al 2013, Zilli et al 2001, Li et al 2008. A high EC (3,700 g/m 3 h) was reported by Ryu et al (2008) from a BTF using polyurethane as packing where the high specific surface area, porosity and the ease of removal of excess biomass through backwashing contributed to a high EC.…”

“…From literature, high toluene EC values (100 -6,700 g/m 3 h) were obtained from BTFs with superficial liquid velocities in the range of 0.001 -0.07 m/h (Chang and Lu 2003, He et al 2009, Sun et al 2013, Zilli et al 2001, Li et al 2008, Ryu et al 2008, Kumar et al 2019) while EC values < 100 g/m 3 h were obtained from BTFs that had superficial liquid velocities one to three orders of magnitude bigger (0.3 -10 m/h) (Misiaczek et al 2007, Weber and Hartmans 1996, Cox et al 1998, Chen et al 2012, Cox and Deshusses 2002, Cox and Deshusses 1999, Singh et al 2010. This further strengthened the hypothesis that the low liquid velocity in the DBTF (0.0007 -0.005 m/h) yielding a thin liquid film on the bed contributed to its high EC.…”