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Four more dry AD plants in pipeline

At least four projects to build dry anaerobic digestion (AD) plants have obtained planning permission, a dry AD technology licence holder told MRW.

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MRW reported in July that Tamar Energy plans to build the first dry plant in the UK in Greenwich (pictured above).

Robin Szmidt, managing director of Kuttner, the UK licence holder of the Swiss Axpo Kompogas’ dry AD technology, told MRW that at least four other dry AD plants were in the pipeline, with the aim to develop them in 2014.

Tamar Energy has confirmed that Kuttner will provide the dry AD technology for Tamar Energy’s Greenwich plant.

The other four dry AD plants will be built in partnerships with other companies, MRW understands.

Dry AD plants can process commingled garden and food waste, which cannot be used in wet AD plants - the only ones currently available in the UK.

Szmidt said that dry AD produced less water sludge in the digesting process, reducing environmental risks, and this made it a better and safer solution for urban areas.

The main obstacle to the development of dry AD in the UK had been longer term returns on investment, around 15 years, in comparison with the 10-12 years of wet AD, he said.

However, he added that conditions were right for the development of dry AD in the UK.

“The technology fits, the waste streams are there, as well as the desire to do it. It is a very easy step to go from composting to dry digestion and into renewable energy,” he said.

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