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Wessex Water

S:MAX sludge screen leads to increased sludge handling capacity for Wessex Water.


290 m3/h


Sludge Dewatering, Digester & Tank Cleaning


High Quality Sludge Products

End Use
Energy Production


Situated in Trowbridge, Wessex Water was facing operational difficulties with their sludge reception and screening plant meaning 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.


S:MAX sludge screen at Wessex Water


As part of the CDE 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.

The S:MAX sludge screen, installed by CDE 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.


Grit recovery from S:MAX sludge screen


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.

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.

“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”
Jon Wright, Asset Planning Manager at Wessex Water
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