REMOVAL OF NONSPECIFIC DISSOLVED ORGANIC-MATTER FROM UPLAND POTABLE WATER-SUPPLIES .2. OZONATION AND ADSORPTION

Ozone has traditionally been used in the U.K. for the removal of organ ic colour from upland raw waters concomitantly converting the composit e organic compounds to lower molecular weight, more biodegradable orga nic acids. However, ozonation has substantially no effect on the disso lved organic compound concentrations and, although the organic removal efficiencies of GAC filtration processes are generally improved due t o enhanced biological removals, ozonation typically results in a deter ioration of the organics adsorption. Consequently, this paper investig ates the effect of preozonation on the organics adsorption efficiencie s of activated carbon, activated alumina, activated bauxite and bone c har adsorbents.