THE USE OF OZONE TO IMPROVE SOLIDS REMOVAL DURING DISINFECTION

In laboratory batch tests, ozonation improved the removal of suspended solids in a subsequent settling process compared with controls in whi ch oxygen was the contacting gas. The amount of improvement (up to 55% ) was dependent on raw water hardness and the initial suspended solids concentration. The particle size distributions observed both before a nd after treatment with ozone closely fit a power law model used by ot hers. For the highest hardness water tested, the increase in particle size after ozonation was significant at the 5% level. A 4 liter/min te st loop was used to treat part of a hatchery water supply in Alaska. T he use of ozone prior to sedimentation or filtration improved the remo val of suspended solids.