Title : Ozonation in a multi-orifice oscillatory baffled column
Abstract:
A novel approach for the intensification of ozonation of water and wastewater is presented using a highly efficient and compact Multi-Orifice Oscillatory Baffled Column (MOBC) ozonation contactor. The MOBC uniquely yielded full (i.e. 100%) use of the ozone supplied with a very short (2.25 min) liquid contact time under continuous operation and without the need of further gas-liquid contacting equipment downstream from the MOBC. The increased performance of the MOBC ozonation reactor was benchmarked against a bubble column (BC) design and resulted in 20% increase on the rate of p-hydroxybenzoic acid (p-HBA) degradation, 75% increase in the rate of mineralization of p-HBA per mole of ozone consumed, and 3.2-fold increase in the rate of mineralization of p-HBA per mole of ozone supplied. This results from the very small size of bubbles (few hundreds of microns) and enhanced gas-liquid mass transfer and hold-up generated in the presence of small fluid pulsations and orifice baffles. Experiments with two pharmaceutical compounds (Diclofenac and Caffeine) were also performed.
• Water ozonation intensification in a Multi-Orifice Oscillatory Baffled Column;
• Higher rates of ozone utilization in a highly compact device;
• MOBC ozonation reactor is benchmarked against a bubble column;
• MOBC allows a reduction of 5-fold to one-order of magnitude in reactor volume.
