Crossness Sewage Treatment Works (STW) is the second largest waste treatment plant in Europe. The facility, owned by Thames Water, serves more than two million people in East London.
Upgraded as part of the London Tideway Tunnels project, the Crossness STW is now able to treat 44% more sewage, reducing storm sewage flowing into the river Thames during heavy rainfall.
The upgrade also included the installation of renewable energy sources including a wind turbine and a thermal hydrolysis plant.
To provide Two-Way Radio communications across this large and diverse site where work is undertaken in often hazardous conditions and safety is paramount.
Fault free communication is essential throughout the site but in addition there are areas which could contain explosive gasses.
Motorola DP4400 radios were supplied to most of the workforce but in addition to these, Motorola DP4401Ex ATEX standard radios were provided for those workers deployed to potentially explosive gas locations.
The size of the site necessitated the use of a repeater for site wide communication but for safety reasons, a direct channel was also programmed into the radios for use in the unlikely event that the repeater should fail.
The repeater supplied is a Motorola DR3000 feeding an off-set omni directional antenna via a duplexer. It is programmed as a conventional repeater extending the radio coverage across the whole site.