Thames Water selects Zickert sludge handling technology for London

Hydro International’s Zickert continuous bottom scraping and surface scum removal technology will collect sludge from 53 primary settlement tanks at Beckton, Crossness and Mogden sewage works. The projects are designed to increase sewage treatment capacity, improve operating efficiency and reduce odour.

At Beckton STW, 24 existing sedimentation tanks will use new Zickert sludge scrapers, adding to eight existing primary tanks already converted to the Zickert system. The £16.5 million installation will cover more than 56 000 sq m. The Beckton Zickert project has been awarded to Hydro International by main contractor GBM, the joint venture of Galliford Try, MWH Treatment and Mott Macdonald.

Hydro International has also started work on a Black and Veatch contract at Mogden to retrofit eight primary settlement tanks and to equip five new tanks. This is part of Thames Water’s £140 million upgrade to increase sewage treatment capacity at the site by 50%.

At Crossness STW, Hydro International is building eight new primary settlement tanks as part of the £220 million upgrade to increase sewage treatment capacity by 44% at the site. The contract was awarded by Tamesis, a joint venture between Laing O’Rourke and Imtech Process.

“These contracts together are a record breaker - the largest ever placed with Hydro,” said Chris Day, operations director of Hydro International Wastewater division. “It’s a true vote of confidence in Zickert technology which has been proven in use in the UK for 15 years. We are expecting other water companies in the UK to follow suit.”