Zero carbon footprint for innovative Scottish Water plant

Scottish Water is unveiling a first following the completion of an upgrade of the Tolsta South Waste Water Treatment Works (WWTW) on the Isle of Lewis.

The works, which serves around 450 customers from North to South Tolsta, is unique in that it requires absolutely no electricity to run effectively.

Tolsta South WWTW demonstrates the advantages of innovative thinking applied within a rural environment.

Archie Campbell, Scottish Water’s project manager, explains why the works really is a one-of-a-kind: “This flagship facility boasts no above ground pipes or power cables.

“As the site operates on an ‘as required’ basis, this means that no electricity provision is required and the works will never actually generate an electricity bill.”

And Joanna Peebles, Scottish Water’s regional community manager for Tolsta, commented: “We are very proud of the fact that we are utilising this innovative technology and giving the community a robust treatment facility that also boasts green credentials.

“This is a great example of our continued commitment to customers in the Western Isles by looking at new ways to provide a great service while keeping costs low.”

The main system consists of a gravity collection network where the waste water is directed through a chamber that incorporates a modern flow-driven overflow screen.

This overflow screen has the added benefit of being self-cleaning.

The flow then continues through a fully mechanical flow control system to a splitting chamber which then leads to the actual treatment stage via two septic tank units.