Abstract: ObjectiveTo study the treatment effect on microorganism in domestic sewage by activated bio-filter and ozone disinfection.MethodsAerobic bacterial count and fecal coliform in sewage were contrasted before and after activated bio-filter and ozone disinfection treatment.ResultsAfter activatetl bio-filter treatment,the removal rate of aerobic bacterial count and fecal coliform was 99.95% and 99.99%;by ozone disinfection,the removal rate was 82.13% and 93.28%,respectively.ConclusionIt was effective to remove microorganism in domestic sewage by use of activated bio-filter.The sewage must be disinfected for epidemiologic safety.