OZONE INACTIVATION OF BIOLOGICALLY-RISKY WASTEWATERS

Total inactivation of ten microorganisms inoculated in a model wastewa ter was achieved by ozone treatment at laboratory scale. Microorganism s selected included four viruses, three non-sporulated bacteria, two s porulated bacteria and one fungus, employed in vaccine preparation for animals. Viruses resulted in the most readily-inactivated microorgani sms and sporulated bacteria the most resistant strains, although Salmo nella typhimurium, a non-sporulated bacterium, showed an unusually hig h resistance. Inactivations followed a second-order kinetic law, depen ding on both ozone and microorganism concentrations. In each case, kin etic parameters which characterize the inactivation process were measu red experimentally.