Lumping-kinetic modeling for catalytic wet oxidation of BIPB wastewater in a trickle bed reactor

Catalytic wet oxidation (CWO) of high-strength BIPB wastewater was studied in a trickle bed reactor (TBR). Integrated into the pseudo-homogeneous-one-dimension-plug-flow model, the power-law model was built to describe the CWO process, but this model wasn't coincident with the experimental results for the industrial wastewater in TBR. Based on the lumping kinetic theory, the Langmuir-Hinshelwood-Hougen-Watson (LHHW) framework was developed and programmed by nonlinear multiparameter fitting and stochastic algorithm. It was shown to perform well in the simulation of the trends of the data from TBR and the identification of multiparameter kinetic reaction schemes. The model parameters, such as activation energy of oxidation, enthalpy of adsorption and desorption reaction etc., were calculated by linear regression analysis. The main CWO reaction pathway was extrapolated from these parameters. Furthermore, the reaction mechanism deprived of that could account for the limiting step of the mineralization of the contaminants in wastewater. The model prediction correlated the experimental results satisfactorily.