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Wessex Water

Wessex Water has increased its sludge handling capacity at Trowbridge STW, reducing downtime of existing capital assets following the installation of an S:Max sludge screen.

Wessex Water provides water and sewage treatment services to the South West of England, which covers around 10,000 sq. kilometres. Its sewerage system includes 30,000km of sewers and more than 400 sewage treatment works, used to treat 475 million litres of sewage from 2.7 million customers.
As part of CDEnviro’s S:Max demonstration programme launched in 2011, Wessex Water allowed the installation of the S:Max at their site in Trowbridge to establish how the system would work with their sludge processing strategy.

Before the installation of the CDEnviro system operational difficulties with the existing sludge reception and screening plant meant that sludge imports were often restricted, this in turn led to increased transport costs and general inefficiencies with tanker drivers travelling to sites further away.
The S:Max sludge screen, installed by CDEnviro, accepts waste from two streams; the imported waste from tankers collected from the surrounding areas, and indigenous sludges generated by the sewage treatment works.

Once screened, the sludge will, following a future capital scheme, go through anaerobic digesters under a controlled process to capture methane for energy production.

The main advantage of the S:Max unit at Wessex Water is the increase in up-time of equipment downstream. As the S:Max is processing sludge early in the STW process its increased screenings capture rate helps avoid the accumulation of rag throughout their processes that follow the S:Max
Jon Wright, Asset Planning Manager with Wessex Water commented on the project saying, “We have seen significant reliability improvements to the sludge reception process at Trowbridge STW following the introduction of the S:Max sludge screen which has allowed us to maximise availability of our sludge treatment plant.”

Not only can the system accept a wider range of material, but the S:Max unit also allows tankers to discharge directly into the system without the need for a reception tank. This provides both substantial operational and maintenance savings, but also minimises capital expenditure as buffering tanks and pumps are not required.

CDEnviro design and manufacture a range of waste reduction and recycling equipment for application in the sewage, waste water, waste management and utility industries. These high performance, high efficiency materials recovery and recycling systems have been developed to substantially reduce waste to landfill and maximise the production of commercial grade products from a number of waste streams.
Throughout our history we have consistently brought new and innovative waste handling and recycling systems to all the industry sectors that we work in. We will continue to develop these systems to ensure the technology we offer enables our customers to maximize efficiencies and minimise costs.

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