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The Effect of Bicarbonate on Ozone-Enhanced Particle Removal in Water Treatment

Ozone is known to enhance the removal of particles in coagulation-filtration systems under certain circumstances. In this work it was observed that bicarbonate is required in order for ozone, applied prior to coagulant addition, to have a beneficial effect on coagulation-filtration and that, in the absence of bicarbonate, ozone has a detrimental effect. It is hypothesized that ozone acts in a positive manner via direct molecular reactions and in a negative manner by the hydroxyl radical pathway, with bicarbonate serving as a hydroxyl radical scavenger.