Canterbury WWTW Digester Refurbishment and Upgrade

Canterbury WWTW serves a population of 73,394 and has four digester tanks, each with a capacity of 1500m3 sludge, at approx.12.8m dia. x 11.9m. As part of Southern Water’s AMP6 upgrade works, Barhale were contracted to fully refurbish and upgrade two of these digesters.

The works included purging the digesters out of service; draining down and cleaning the digesters; carrying out necessary surveys and ensuing repairs; replacing the old gas mixing system with a new chopper pump system and all associated pipe-work; installing new temperature probes; testing & commissioning and conducting a 28 days reliability test.

The works took place in an extremely challenging working environment that presented some of the highest risks within the industry.