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We were responsible for the full scope of services for the Northern wastewater treatment works (NWTW), including preliminary and detailed design, documentation, contract administration and site supervision.

Three 8 m diameter reinforced concrete vortex degritters with an average dry weather flow capacity of 150 Ml/d were installed at Unit 3 to replace three gravity settling units.

The project also included the stainless steel airlift pipework and a unique fluidisation process using two pumps to pump screened raw effluent.