The DRAC, (“Desinfecció i Reutilització d'Agües Residuals a Catalunya”, Wastewater disinfection and reuse in Catalonia - Spain), project is included in a RDD (Research, Development, and Demonstration) program. The project arises from the necessity to define reclamation treatments guaranteeing an effluent with enough quality to be reused with a minimal microbiological risk. This paper presents the first results obtained from the combination of a physical-chemical pilot and two disinfection pilot systems: ozone and chlorine dioxide. The combination of physical-chemical and disinfection systems allows the use of lower doses of disinfectants, thus minimising the negative impacts of the whole process and improving the reliability of the reclamation facilities.

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