International Journal of Chemical Technology

摘要

Modeling of Chemical Oxygen Demand (COD) reduction kinetics has been investigated in this study considering hydrocarbon lumps. Traditional approach considers all oxidizable organics as a single lump and a pseudo-first order kinetics for its complete mineralization. Since, single step mineralization is an idealized approach, results from the model have limited matching with the experimental data in narrow ranges. The aim of this study was therefore to develop model forms which will not only match better but will also have greater range of validity, particularly in cases of mixture of pollutants. In this study mathematical models for COD reduction have been developed based on proposition of possible alternate pathways involving more than one lump of degradable. The COD reduction experiments for a typical petrochemical industry effluent by Fenton?s reagent were carried out with 150 mL wastewater. Data from these experiments are fitted to the models and the results are discussed. Fitting of literature reported data for these models have also been carried out. It clearly appears that considering the oxidizables as a single lump is clearly an over simplification and models involving either two lumps being oxidized simultaneously or the process occurring in two steps represent the Fenton?s process much more closely than the conventional model in case of industrial/real effluents. These multi-lump models represent the progress of COD reduction during Fenton?s reaction with much improved accuracy.