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Modelling shock loadings and starvation in the biofiltration of toluene and xylene
Author(s) -
Métris Aline,
Gerrard A Mark,
Cumming Robert H,
Weigner Pavel,
Paca Jan
Publication year - 2001
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.422
Subject(s) - biofilter , toluene , perlite , compost , chemistry , xylene , biomass (ecology) , carbon dioxide , inlet , environmental chemistry , environmental engineering , pulp and paper industry , environmental science , waste management , organic chemistry , materials science , ecology , mechanical engineering , engineering , metallurgy , biology
Abstract The response of biofilters to varying periods of starvation and to changes in inlet concentrations of a mixture of toluene and xylene have been tested in laboratory‐scale biofilters packed with a mixture of Perlite and compost. These results have been mathematically modelled taking the emission of carbon dioxide as a proxy for kinetics measurements. The use of CO 2 is a more practical approach than that of kinetics based upon batch experiments on pure cultures. A simplification of Zarook's method, our model produced good outlet predictions given small changes in the inlet concentration of toluene and xylene. But for more stressful situations, like the resumption of the feed after periods of starvation, the use of carbon dioxide proved to be inappropriate as an indicator of the biomass activity, greatly overestimating biofilter performance. This suggested either the occurrence of cryptic growth (as a result of the stress inflicted on the biomass) or perhaps the utilisation of the compost as a carbon source. © 2001 Society of Chemical Industry