Modeling ozonation as pre-treatment step for the biological batch degradation of industrial wastewater containing 3-methyl-pyridine.

A heteroaromatic substance, 3-methylpyridine, as model pollutant, was degra ded by ozonation bubble-column. This was the first step of a sequencing bat ch biofilm. reactor process (SBBR). The modeling of this batch ozonation was developed in different steps. The model included hydraulics of the reactor, chemical kinetics and effects of gas-liquid transfer processes. The crucial and most sensitive part of the m odel was the observed fast consumption of ozone during gas-liquid transfer reactions. Without including these processes into the model, it was impossi ble to explain the experimental observations. The ozone consuming processes in the gas-liquid film are not totally understood at present.