Impact of advanced oxidation processes on the biodegradation kinetics of industrial wastewater

摘要

Advanced oxidation processes (AOPs) were applied prior to biological aerobic treatment by means of activated sludge. Textile wastewater was chosen as an example of industrial wastewater and the chemical oxygen demand - COD - was an overall measure of biodegradable substrate concentration, while the biomass concentration was expressed by volatile suspended solids - VSS. The kinetic investigations were applied to synthetic wastewater consisting of anthraquinone dyestuff Acid Blue 40 C.I., anionic detergent Avivage KG conc., softening agent Tetrapol CLB and mineral salts. Kinetics of microbiological destruction of the pollutants were described by the Monod equation. The kinetic parameters of the equation: maximum specific rate of microbial degradation, affinity (Monod) constant and yield coefficient were identified from the experimental data obtained at laboratory scale. The influence of various AOPs on the kinetics of biodegradation was analysed. The experimental evidence of the positive effect of chemical oxidation pretreatment on the biodegradation of recalcitrant compounds was quantified by estimation of the kinetic parameters of the Monod equation employed in biodegradation of the wastewater.