Commissioned to increase the resilience of the Ardmore Water Treatment Plant after a major storm event in 2017, this project involved retrofitting ultraviolet treatment to the filtered water stream to provide a second protozoa barrier.

The project included: constructing a new UV inlet / overflow chamber; installing a new overflow pipe; a 3m excavation of the UV reactor room and underpinning the existing water tank walls, undertaken while the Plant remained operational; procuring and installing three of New Zealand’s largest DN1200 K143 UV reactors plus components, pipework, and ancillary equipment to operate the UV reactors; modifying the mixing tank weir to achieve the specified flow targets; electrical, control, and instrumentation works; and integrating these works into the existing WTP.

Given Ardmore’s importance in the wider network, Watercare sought to improve capability quickly, engaging BPC in a direct appointment ECI to develop, design, and construct an efficient and practical solution. It had to be retrofitted within the existing plant, without compromising throughput.