Food waste AD plant supporting UK CHP

Waste management firm Viridor has installed a Babcock Wanson HEB 1050 Hot Water Boiler at its anaerobic digestion plant at Walpole near Bridgwater, Somerset, UK (pictured) to support its operations.

Viridor operates several anaerobic digestion (AD) facilities across the UK, with the gas produced used as a source of energy for heat and electricity which is fed into the National Grid.

To aid the production of methane, the digestors are warmed by circulating hot water around them and the company’s new Walpole site has one boiler used to start the initial AD process and act as a standby, should the combined heat and power (CHP) system require maintenance or supplementary heat.

Gas or oil fired, the boiler has been supplied by Babcock Wanson as a fully containerised solution.

The Walpole AD plant will be able to process up to 30,000 tonnes of food waste per year and is expected to save Somerset council tax payers £200,000 a year. Gas from the plant will be used initially to generate electricity - about 9,500 MWh a year - with nearly four-fifths exported to the grid.

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