ESG Brochure 2023 - Report - Page 6
Environment
Selwood Case Study
Anglian Water’s Chelmsford Wastewater Recycling Centre (WRC) was operating normally until
a problem with their Archimedes screws arose. These screws are responsible for transporting
Return Activated Sludge (RAS) from a lower chamber to a high chamber to be treated further
down the treatment process.
Both screws failed at the same time leading to an emergency, a flow of 500 l/sec needed to be over pumped
to the next stage in the treatment process. If the over pumping didn’t happen quickly there was a risk of an
environmental spillage. Selwood were promptly contacted to find and execute an effective solution.
The initial, short-term solution saw the installation of five diesel pumps, combined with five 8” 100m pump
lines. The longer-term solution involved two H12 pumps coupled with two 300 kVA generators in a duty/
standby configuration and 150m of 12” flanged pipework.
■ Extremely quick action from Selwood, providing a short- and long-term solution in a week,
eliminated the risk of a pollution incident and negated the need for tankers for waste
disposal, whilst achieving the desired flow rate.
■ The robust solution brought the security of success, meaning Anglian Alliance
Partners could carry on repairs without concern of any possible incident.
■ By the time the longer-term solution had been on site for six weeks, Selwood
saved Anglian water in running costs and 5,000L of fuel.
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WORKDRY ESG
