where Cln is the logarithmic mean concentration [(Cgi
−
Cgo )/ ln(Cgi /Cgo )], V is the biofilter volume (m3), and Q is the volumetric
flow rate (m3 h−1), rmax and Km for the gas phase can
be obtained by plotting [(V/Q)/(Cgi
− Cgo )] against (1/Cln) with
correlation coefficient of 0.9922 which showed that Monod
equation could properly express the biodegrading kinetic.
From Fig. 6, the rmax and Km were calculated as 50 gm−3 h−1
and 3.495 gm−3, respectively. It showed that there was no
inhibition effect of toluene on the fungal population under
the studied concentrations. Also, Km was reported around
7.45 gm−3 (Mathur et al., 2006) for mono-chlorobenzene
removal. As the elimination capacities obtained here is significantly
lower than calculated rmax, it seems that the control of
the reaction by kinetic is a proper assumption. Therefore, that
the system can operate under higher loads of pollutant in this