Integration of thermal hydrolysis into sludge treatment at cottonvalley WwTW, milton keynes

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Courtesy of Cambi AS

The paper is a case study of the construction, commissioning and operation of a new 21,000 tonnes dry solids per annum sludge treatment centre at Anglian Water’s wastewater treatment works at Cottonvalley, Milton Keynes. The construction of the new sludge treatment centre was completed in summer 2008 and is part of Anglian Water’s £95 million AMP5 biosolids programme to provide treatment capacity for approximately 100,000 tonnes dry solids per annum to achieve an enhanced treated standard. The Cottonvalley project was delivered by the Black & Veatch as the design and build contractor and supported by Mott MacDonald as the civil engineering designer.

The new plant was constructed on a the site of the existing sludge treatment centre which uses conventional anaerobic digestion followed by 21 day liquid storage and dewatering. The existing treatment centre was capable of treating approximately 12,000 tonnes dry solids per annum. The project installed a CAMBI Thermal Hydrolysis process upstream of two existing 3750m3 anaerobic digesters increasing the treatment capacity up to 21,000 tonnes dry solids per annum.

The new plant comprises of sludge screening and thickening, thermal hydrolysis, digestion and dewatering. The plant is heated using steam that is provided by a 1.4 tonne waste heat recovery boiler connected to a new 1.75MWe CHP engine and a 6 tonne supplementary dual fuel steam boiler.

The paper will focus on the challenges of integrating thermal hydrolysis into an exiting operational sludge treatment centre, plant commissioning and performance of the process in the first few months of operation.

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