Kinetic modelling of wet oxidation treated debarking water; pp. 233–242

The objective of the research was to compare the behaviour of two kinetic models in parameter estimation with lignin containing waters, based on experiments of wet oxidation of debarking water. When comparing the results of the models, the model with lignin included (M2) was found to be more suitable for describing the kinetics of wet oxidation of debarking water. Lignin degraded first to other chemically oxidizable compounds rather than straight to biodegradable products. The activation energies for the degradation reactions fell with a change in the pH from 5 to 12 from 51 to 21 kJ/mol and from 84 to 12 kJ/mol, respectively. This supports the experimental finding that lignin degradation is faster in basic conditions. The model could predict the degradation of lignin as well as the important wastewater parameters COD and BOD.