Use of UV, Ozone, and Chlorine for a Multi Barrier Disinfection Approach in Melbourne, Australia

The Eastern Treatment Plant (ETP) in Melbourne, Australia has implemented a multi-barrier approach to provide recycle water to local customers. A risk based approach was used to establish the microbial pollutants of concern and level of protection that would need to be provided. This risk assessment identified cryptosporidium, andenovirus and e Coli as well as the target levels that would need to be achieved. Demonstration testing of various treatment approached was conducted to verify that the risk based established discharge requirements. Results of the testing indicated that the a process of ozone, biological activated filtration, ultraviolet light and chlorination Design and construction of facilities has been completed and now is providing recycle water.