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Thames Water Installs Storm Tank at Bentley STW

by Anna

Thames Water has completed the installation of a new storm tank at Bentley Sewage Treatment Works (STW) as part of a £6 million upgrade aimed at enhancing its overall capacity. This addition is crucial in reducing the need for storm discharges during heavy rainfall, supporting Thames Water’s commitment to improving infrastructure and mitigating the effects of climate change and population growth.

Storm Tank Installation Ahead of Schedule

The new storm tank, which measures 18 by 6 meters, can store up to 252 cubic meters of wastewater, equivalent to two hours of storage at the site’s maximum flow rate. This upgrade will significantly improve the facility’s ability to manage stormwater, ensuring better protection for the local environment. Initially expected to be completed in March 2025, the installation was finished six months ahead of schedule, in September 2024, just before the rainfall season.

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By increasing the site’s capacity, the new storm tank will help reduce the frequency of storm overflows, which are a key environmental issue. The project aligns with the government’s 2030 target to minimize stormwater discharges into natural waterways.

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Phosphorus Reduction Scheme for Improved Water Quality

In addition to the storm tank, Thames Water is also implementing a phosphorus reduction scheme at Bentley STW, designed to enhance the quality of the effluent released into the river after treatment. This aspect of the upgrade is expected to be completed by 2025, further contributing to the company’s goal of improving river health.

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A Step Towards Resilient Infrastructure

Kevin Brown, Senior Project Manager at Thames Water, emphasized the significance of the upgrade: “This storm tank is an important addition to our infrastructure, allowing us to protect the health of our rivers and waterways. As part of our £6 million upgrade, the phosphorus reduction scheme will also help improve the quality of treated effluent.”

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Brown also highlighted the challenges posed by climate change and population growth, noting that Thames Water is committed to building resilient infrastructure to continue delivering reliable services to customers. While the company plays a key role in maintaining water quality, Brown called for a collaborative effort to ensure the health of the nation’s waterways.

Ongoing Upgrades Across Thames Water Network

The Bentley STW upgrade is part of a broader initiative by Thames Water to improve its infrastructure, with plans to upgrade 250 wastewater treatment sites across its network. Nearby sites, such as Newmans Lane and Crondall STW, have already benefited from similar enhancements earlier this year. These efforts are crucial in meeting government objectives for reducing storm overflows and improving water quality in the face of growing environmental pressures.

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