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Nick Fawcet: Mogden Sewage Treatment Works was built in the 1930s and it served a population
at that time of just under a million people. Since that time the population of London has
increased rapidly and Mogden now serves a population of around 2 million people. The
project was needed because the sewage coming into the works exceeded the treatment capacity,
and therefore, we were getting storm discharges directly into the River Thames.
Mark Allan: Mogden is about the third largest sewage treatment works in the UK. It handles
flows of approximately 6 cubic meters per second. Thames Water had a regulatory obligation
to provide increased treatment capacity and also to an improved standard. By constructing
the new part of the Modgen Treatment Works, we’ve helped them do exactly that.
Nick Fawcet: The main objective is reducing significantly the amount of storm sewage that’s
going into the River Thames, thus improving the water quality and enhancing the aquatic
environment for fish and other species. It also provides a general amenity benefit as
well to the local communities of those people particularly who work and use the river for
leisure.
Mark Allan: Providing innovative solutions was a key part of our offering to Thames Water
and here we’re standing on top of the aeration lanes, and that’s probably a key area to
identify one of the main innovations that we brought forward. We have the latest in
fine air bubble diffusers installed here powered by the latest technology friction-free blowers.
Looking at reducing the carbon footprint here at Mogden, I think one of the biggest innovations
that we brought forward into the project was the replacement of a 12 meter high concrete
reinforced retaining wall with a 12 meter high earth retaining wall. That in itself
saved some 2,300 cubic meters of carbon, a fantastic saving for the project.
Nick Fawcet: When you come to the end of a large project like this, it’s always good
to reflect on how things have. This project in particular at Mogden, it being the first
of the very large upgrades that we had to achieve, it’s a real sense of pride in being
able to not just deliver a project, but deliver it well, deliver it on time, involve the local
community, enhance the natural environment and the local environment as well. And I think
the enduring sort of memory for me around this project is really going to be about the
team working, it’s going to be about a project that was a big challenge, but something that
we worked together on and we achieved a great, great result.