The largest job, 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 to ensure they comply with the nitrate vulnerable zone regulations.
Another £28m scheme will see the firms 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.