It is important to note that the localized concentration profile provided valuable information on the degradation profile. The CDR model was the used for determination of local BTEX concentration profile along the biofilter bed height. In this study, local BTEX concentration profile along the biofilter bed height was determined by using CDR model predictions and compared with experimental concentration profiles of BTEX. The parameters used from previous study to solve the biofilter model equations (Rahul and Majumder, 2013). The details of mathematical model presented in previous paper (Mathur and Majumder, 2008).