This seems to be the basic concept. I don't know what would be the best name for these installations but 'anearobic digestion plant' seems a likely candidate for "biovergistingsinstallatie".
The best name may depend on the context.
Anaerobic digestion is a collection of processes by which microorganisms break down biodegradable material in the absence of oxygen. The process is used for industrial or domestic purposes to manage waste and/or to produce fuels. Much of the fermentation used industrially to produce food and drink products, as well as home fermentation, uses anaerobic digestion.
http://en.wikipedia.org/wiki/Anaerobic_digestionWhat is Anaerobic Digestion?
Anaerobic Digestion (AD) converts 30-60% of the digestible solids in the feedstock into biogas by bacterial fermentation. The biogas is then burned to generate renewable energy.
http://www.afbini.gov.uk/index/services/specialist-advice/re...Anaerobic Digestion Plants for Agriculture - image
http://tinyurl.com/nxd7erm