Project Profile: Crossness STW Project: Crossness STW, Digester Tank Refurbishments Client: Thames Water Utilities Ltd The project: The Crossness Sewage Treatment Works (STW) is Thames Water’s second largest treatment works plant, treating water for most of South London. As well as treating huge amounts of sewage each day, it is also home to one of Thames Water’s two sludge-powered generators, which produce renewable energy to assist in powering the site. APA Concrete Repairs Ltd were appointed to undertake various surveying and remedial works to refurbish two of the STW digester tanks. The solution: Initial works consisted of various surveys and tests to determine the scope of remedial works required, including structural surveys, carbonation tests and chloride prof

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