The largest of the schemes, worth £28m, involves the development of sludge treatment and storage facilities at three waste water treatment works at Camberley and Chertsey in Surrey and Crawley in West Sussex.
The work is required to bring them into compliance with the Nitrate Vulnerable Zone regulations.
The other major scheme, worth £27m, is to modify processes at Deephams waste water treatment works in Edmonton, north London, to facilitate the removal of phosphates and improve sludge treatment at the site.
Ultimately aimed at improving the quality of river water and sludge production, the schemes will be undertaken as part of the AMP5 framework contract with Thames Water awarded in April 2010.
Galliford Try chief executive Greg Fitzgerald said: "We are delighted to secure this additional business from an existing framework client. It builds on our track record in delivering both clean and waste water infrastructure projects. Galliford Try is one of the UK's leading infrastructure contractors to the water industry, working under five-year asset management programmes as well as on single projects for seven of the country's major water utility businesses."
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