Technical services provider Imtech, as part of the Tamesis team – a joint venture between Laing O’Rourke and Imtech Water, Waste & Energy – has been awarded a £75 million contract by Thames Water to develop two Advanced Digestion plants at wwtp Crossness and wwtp Beckton in London.

By advanced anaerobic digestion of sewage sludge, it is possible to convert the sludge into biogas, contributing both environmentally and financially.

Thermal hydrolysis
This substantial investment is part of the Thames Water Sludge Strategy. The strategy has been developed to include a number of anaerobic digestion plants at sludge treatment centre’s in South East England.

The project comprises the design, construction, commissioning and optimisation of two new advanced digestion plants, including two-stream Thermal Hydrolysis plants. Thermal hydrolysis is a process that uses elevated pressures and temperatures to increase cell breakdown and increase biogas yield.

One of Europe's biggest waste water treatment plants
The two-year investment programme is situated on two of the largest sewage treatment works (STW) in the UK. Beckton STW is one of Europe's biggest waste water treatment plant and serves a population of over 3 million. Crossness serves over 1.8 million.

When completed each THP plant will provide sludge treatment capacity for approximately 42,000tds/year (tds = totally dissolved solids) to treat indigenous sludge from the sites.

Joint venture Imtech and Laing O'Rourke
Commented Bruno Speed, Managing Director at Imtech Water, Waste & Energy: ‘This is a major contract for the Tamesis team and we are delighted that it has been awarded to us. Tamesis is already upgrading the STWs at Crossness and Beckton, so we are well versed with the existing sites. The joint capabilities of Imtech and Laing O’Rourke mean that we are perfectly positioned to undertake such a prestigious project.

Advanced AD is an important step forward for Thames Water, helping the business to become more sustainable and move towards power self-sufficient wastewater treatment.’

This news item was originally published on the website of Imtech.

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