Case Study

Cleaner Recirculating Cooling Towers

May 12, 2014

In the middle of 2009, controlled trials of the application of chlorine dioxide as an alternative cooling water biocide was undertaken at a gas fired power station in the United Kingdom.

The 1420 MWe gas fired power station combusts natural gas in four combined cycle gas turbine (CCGT) units (Units 1 - 4). The station has a recirculating hybrid tower cooling system, with estuarine water abstracted from the local river as circuit make-up.

The estuary up to the site is designated as a Site of Special Scientific Interest, notified under the Wildlife and Countryside Act 1981, a Wetland of International Importance under the Ramsar Convention and a Special Protection Area under the EC Conservation of Wild Birds Directive. These designations stem from the international importance of this estuary for migratory wildfowl and wading birds. 

These large bird populations use the productive mudflat and salt-marsh areas for feeding and roosting sites. The estuary also acts as a nursery area for several species of fish, and has been designated as a bass nursery area. Any adverse effects on the invertebrate populations living in the mudflat areas would be of considerable significance for these bird and fish populations.

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