KSB waste water pumps for Britain’s largest waste water and sewage treatment plant
Alongside four large waste water pumps, KSB has been commissioned to supply two smaller drainage pumps destined for installation in a shaft structure 85 metres deep and future transport of combined stormwater and sewage.
Wear-resistant white cast iron for waste water pumps
6,600 volt motors rated at 3.4 MW and controlled by frequency inverters will be used to drive the waste water pumps. To keep these motors cool, KSB will deploy heat exchangers specially engineered for this underground application. Compared with equivalent air-cooled systems, these heat exchangers will markedly reduce the amount of energy required to dissipate the thermal load. The white cast iron makes the waste water pumps wear-resistant and ensures a long service life.
The treatment plant will be located at the end of the nearly seven kilometre long Lee Tunnel, which itself represents the first construction stage of a huge project. During periods of heavy rainfall, this structure is intended to prevent an untreated mix of stormwater and sewage from entering the Thames.
Sewage treatment plant for the largest British water project ever undertaken
With a diameter of seven metres, the Lee tunnel will be able to handle and temporarily store around 382,000 million cubic metres of stormwater after its completion. The 675 million British pound budget provided makes it the most comprehensive water project ever undertaken in the United Kingdom; its completion is planned for 2015.
KSB Limited will look after the pumps once they are in operation at the treatment plant
By the final stage of construction, the tunnel will extend some 39 kilometres and be accessible via around 40 shafts. At a depth of 25 to 80 metres, it will follow the course of the Thames, making it the deepest tunnel in London and one of the deepest waste water tunnels in Europe.
To ensure smooth operation at the Beckton Sewage Treatment Works, KSB Limited will maintain and service the waste water pumps once they are in operation.