Abstract:In order to control worm pollution more effectively in drinking water treatment processes, cooperative controlling effects of chemical oxidation and sand filtration on Tubifex tubifex were studied. Interception-inactivated technology, established by combining interception of sand filtration and inactivation of oxidation, posses high controlling effects on T. tubifex pollution. When the dosage of ClO2 was higher than 0.1mg/L, rate of interception-inactivation to T. tubifex reached 100% under the range of filtration rates from 9 to 15m/h. During interception-inactivation, the interception of sand filtration prolonged inactivated contact time, which resulted in the promoting of inactivation effect. At the same time, inactivation of oxidation ould not only kill some worms, but also decrease migration ability of survived worms by which the interception effect of sand filtration was strengthened. Naidid pollution occurred in BAC filter was controlled efficiently by underling sand under BAC and carrying out interception-inactivation in sand. In this way, adverse effects of worm pollution controlling on BAC filter’s adsorption and degradation were avoided.