Operating Experience of Aberdeen Cambi Thermal Hydrolysis Plant 2002

This paper reviews the establishment of a new 50 dry tonne per day biosolids processing facility at a green field site at Nigg Bay, Aberdeen Scotland. Prior to 2001 all sewage had been pumped by long sea outfall into the North Sea. Consequently there was only a minor biosolids operation in the area dealing only with small, rural works.
Proposals were sought from a number of consortia for a design, build, finance, operate (DBFO) contract in 1998 by North of Scotland Water Authority (NoSWA) for the Grampian region, which includes new coastal plants at Aberdeen, Peterhead and Fraserburgh as well as many existing smaller plants inland.
NoSWA’s consultant had recommended either thermal drying or incineration for the conforming bid, as there was uncertainty about the agricultural route. A consortium, Aberdeen Environmental Services (AES) including Yorkshire Water, its subsidiary - Grampian Wastewater Services Ltd (GWSL) as operator and EarthTech Engineering Ltd. as designer proposed the CAMBI digestion alternative. The consortium bid was the successful proposal due to a clear financial advantage on capital and operating costs.
The inclusion of CAMBI Thermal Hydrolysis was a major contributor to the success of
the project.

 

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