Bio Dynamic

Focus on renewable energy

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What is AD?

Anaerobic Digestion is a natural biological process where organic material, in our case food waste, is broken down by bacteria. It is similar to composting but differs in that it takes place in sealed, oxygen-free tanks to produce biogas that can be used to generate electricity and heat. Currently, much of our biodegradable waste is sent to landfill, where it breaks down to release methane, a powerful greenhouse gas. AD helps tackle climate change by diverting this waste from landfill and incineration.


Biogas is the output of an anaerobic digester that provides energy. It is approximately 60% methane and 40% CO2. It is mainly used to generate electricity for local use and for feeding into the national electricity grid.


Anaerobic digestate is a biofertiliser, which can be used as a replacement for mineral fertilisers, reducing costs to farmers and minimising greenhouse gas emissions from cultivation. It is a black liquid similar to the thickness of gravy. Food-based digestate contains high levels of nitrogen and useful amounts of phosphate and potash, together with small quantities of other nutrients to help maintain soil fertility.

Anaerobic Digestion

Anaerobic Digestion is not a new technology, it has been used in the UK since the late 1800s, but now an increasing number of AD plants are being built in the UK to generate clean, renewable energy. It is recognised by the government, Defra, the Welsh Assembly, the Scottish Parliament, Friends of the Earth and the National Farmers Union as one of the best methods for the organic recycling of food waste, farm waste and sewage sludge.