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05 October 2004

Mott MacDonald wins contract to assist in development of €68 million sludge incinerator in St Petersburg, Russia

Mott MacDonald has won a contract from SUE Vodokanal of St Petersburg – St Petersburg’s water and wastewater utility - to supervise the provision of wastewater sludge incineration facilities for its northern wastewater treatment plant that serves 1.6 million people. The new facilities – which will reduce the quantities of sludge currently going into landfill sites – are also being designed to generate electricity and supply district heating by utilising waste heat.

Under the €41 million first stage of the ‘design-build’ contract, two fluidised bed incinerators will be developed, each capable of incinerating 61 tonnes of sludge and dry solids per day.

The majority of the ash in the incinerator flue gas will be removed by electrostatic precipitators. Chemicals will then be injected into the flue gas streams to react with substances such as sulphur and mercury to produce solids, which together with the remainder of the ash will be removed by bag filters so that the flue gas released into the atmosphere complies with the latest European Union directive.

The incineration process won’t require additional fuel as the existing sludge thickening and dewatering process will be upgraded so that the dry solids content of the sludge entering the incinerators is not less than 25% weight for weight. The hot flue gases will be used to raise steam so that the waste heat from the incinerators can be utilised to generate up to 3 MW of electricity and to provide heat for an existing district heating system.

Mott MacDonald has been involved in the preparation of the bidding documents, and provision of technical advice to Vodokanal during the bid evaluation and negotiation process. The consultant is also acting as engineer under the FIDIC contract and will review the contractor’s design, provide specialist advice to Vodokanal, and supervise construction.

The project will be completed and commissioned in October 2006.

Note to editor:

1.The first contract, based on the FIDIC 1999 plant and design build conditions of contract is to be financed principally by loans from the European Bank for Reconstruction & Development and Nordiska Investeringensbanken (NIB).
2.Mott MacDonald has worked with Vodokanal before providing water and environmental corporate development support as well as management and procurement support.

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