After international tendering, Bruun & Sørensen Energiteknik AS - now an integrated part of COWI - was selected in 1993 by Shetland Island Council to assess and point out the possibilities of waste incineration and energy efficiency most suitable for the Shetland community. Besides, the most suitable technology for use on the Shetlands should be determined.On this basis, specification of requirements and tender documents concerning turnkey supply of the incineration plant were to be elaborated. After contract negotiations and contracting, our task was extended to comprise project management and supervision of establishment and commissioning of the project. The plant was handed over to Shetland Island Council ultimo 1999.We carried out evaluation of i.a. technical and financial consequences of 5 different possibilities of placing the plant. On this basis, two placings were selected for further investigations. A detailed environment and economic evaluation was carried out, resulting in a recommendation to the Council to place the plant in an industrial area north of Lerwic, the capital of Shetland with about 8,000 inhabitants.The plant was requested to be carried out considering "best value for money" and with well proven technology due to the remoteness of the Shetlands. After having surveyed a number of reference plants in Europe and evaluated the accessible waste resources it was finally decided to choose the following plant.
The flue gas cleaning installation is made as a wet system to limit the amount of waste products from the plant to a minimum as there are no deposit possibilities in the Shetlands.The flue gas cleaning complies with the future increased demands of EU on emissions from waste incineration. Thus, a dioxin filter with activated charcoal injection and a CeNOx installation have been built into the boiler (SNCR).