Implementation of Enhanced Enzymic Hydrolysis and Digestion Plant at Kings Lynn WwTW

Riches, S.1, Oliver, B.2, and Brown, C.2, 1Anglian Water Services Ltd, 2Imtech Process Ltd


The paper is a case study of the construction, commissioning and operation of a new 19,000 tonnes dry
solids per annum sludge treatment centre at Anglian Water’s wastewater treatment works at Kings Lynn
in Norfolk. The construction of the new sludge treatment centre was completed in spring 2008 and was
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 Kings Lynn project was delivered by the Galliford Try, Imtech joint venture as the design and build contractor and supported by Mott MacDonald as the civil engineering designer.

The new plant was constructed on a greenfield site adjacent to the main WwTW and designed to treat
19,000 tonnes dry solids per annum to achieve an enhanced treated standard. The Monsal Enhanced
Enzymic Hydrolysis (EEH) process upstream of two 6000m3 anaerobic digesters has been used with the
plant replacing an existing raw sludge dewatering and lime stabilisation facility.

The plant comprises of sludge screening and thickening, enzymic hydrolysis, digestion and dewatering.
The plant is heated and powered by two 1MWe CHP engines and a supplementary steam boiler both fuel
by biogas. Hot water is used for heating stage 1 of the EEH plant to 42 degrees and steam injection is
used to heat the sludge to 55 degrees in stage 2 of the EEH process.

The paper will focus on the changes made to the EEH process to incorporate the steam heating, the plant
commissioning and performance of the process in the first nine months of operation.

Unfortunately the author was unable to provide a full paper.

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