Design, installation and start-up tests of the aeration system in the biological treatment stage.

The wastewater treatment plant treats a population equivalent of 194 620. The plant was refurbished in 1999 when the old aeration system, with perforated pipes, was replaced by fine bubble diffused air aeration system using the membrane diffusers DM-320. This allowed energy savings in the range of 2.8 million kWh/year to be achieved.

Number of DM-320 diffusers – 5616