Water & Wastewater Treatment

16 | JanUaRY 2015 | WWT | www.wwtonline.co.uk Project focus A three-year project to increase capacity, improve odour control and deliver high-quality sludge for energy generation at Thames Water's major Mogden, Beckton and Crossness sewage treatment plants is coming to fruition. Sludge handling technology is being upgraded as part of a multimillion pound investment in sewage treatment at Thames' major London sewage treatment plants. Since 2011, Thames has fitted a total of 53 new or refurbished primary settlement tanks with Zickert bot- tom and surface scraper technology, through a contract with supplier Hydro International worth more than £20M. It's all part of the £675 million upgrade of the five treatment works at Beckton, Crossness, Mogden, Long Reach and Riverside in Thames Water's London Tideway Improvement programme, which has the overall aims of improving discharge qual- ity, operating efficiency and biogas generation to supplement treatment plant energy requirements. Primary Settlement Tanks at the works became a focus in part because of the need to control the odour experienced in nearby residential developments, explains Garry Strange, Sludge Strategy Manager for Thames Water. "One of the key factors in Thames Water's strategy was con- sideration for nearby communities ● £20M project to improve 53 tanks at five Sewage Treatment Works ● Tanks fitted with bottom and surface scraping technology ● Upgrade required to boost sludge efficiency and maintain odour control "Engaging with our customers is very important to us, with odour control being an understandable focus" Garry Strange, Thames Water The Sewage Treatment Works at Crossness (above and below) has had eight new settlement tanks fitted with the technology ● Residential develop- ment near Thames' Sewage Treatment Works meant that primary settle- ment tanks needed to be covered to control odour ● Scraping technology needed along with cover to boost efficiency of pro- cess and ensure quality of sludge ● Sludge scrapers using traditional travelling bridge technology were unattractive due to head- room and maintenance concerns • Drivers Tanks Sludge handling technology upgrade for Thames Water

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