ABB dissolved oxygen meters help Thames Water cut energy consumption for compressed air by 10%

Our dissolved oxygen meters are now helping Thames Water to reduce energy consumption by around 10% in its compressed air blowers at the giant Beckton sewage treatment works in the London Borough of Newham.

The meters are part of a new control system designed to optimise the amount of compressed air used to treat the sewage. At Beckton, like virtually all sewage treatment works, oxygen is used in the process to break down organic matter by injecting oxygen in the form of compressed air into the sewage. But substantial sections of the site date back to the 1960s and previously included no instrumentation to match the supply of compressed air to the variable oxygen demand of the sewage.

The new installation includes 28 dissolved oxygen systems in total, made up of 16 AX480 single-input analysers and 6 AX488 dual-input analysers. All the systems are controlled from a central computer using on-board Profibus communications. The rugged, IP65 rated design of both analysers makes them suitable and safe to use in harsh environments. They are also simple to install and use and require minimum maintenance, which makes them ideal for fully automated control schemes such as the installation at Beckton.

Beckton is already one of the largest sewage treatment works in Europe, serving 3.5 million people and discharging its effluent into the River Thames. The new control system is part of a £190 million programme upgrade that will enable the site to treat up to 60% more sewage by the end of March 2014. This will enable it to handle storm water as well as a growing population, helping to safeguard the Thames.

Our AX400 Analyzers incorporate the latest technology providing highly reliable, flexible, feature-packed devices that satisfy a diverse range of process monitoring and control applications. The complete range encompasses solutions for pH/Redox (ORP), conductivity and dissolved oxygen.

For more information, email moreinstrumentation@gb.abb.com or call 0870 600 6122 ref. ‘AX468’.

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