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the process of which organic substances are broken down into simpler forms of matter, to decay or cause to decay.


is the material remaining after the anaerobic digestion of a biodegradable feedstock. 

Dirty Material Recovery Facility (MFR)

a specialized facility that receives a mixed solid waste stream and then proceeds to separate out designated recyclable material through a combination of manual and mechanical sorting.


Diverting material that can be composted, recycled or reused from a landfill.

Diversion rate

the proportion of waste material diverted for recycling, composting, or reuse and away from landfilling.

Dry Anaerobic Digestion

The material processed during dry AD is normally around 25 – 30% DM and has the consistency of thick porridge. In constant flow digesters this must always be mechanically stirred, not only to prevent settling and unequal pocketing, but also to assist the flow of the material through the reactor.

Dry digesters are ideally suited to high DM feedstock such as energy crops, garden wastes and mechanically recovered municipal wastes in MBT plants.

is stackable feedstock with a TS content higher than 30% is utilized in an AD plant without the addition of external liquid.