DMT developed/operates a biogas upgrading plant at a ROVA anaerobic digestion facility (Kompogas) in Zwolle. They are able to generate 85m3/gas per tonne waste.
ROVA is a public sector company that is responsible for the collection of wastes in the area. They are working with the municipal cooperative HVC (see Day 2 blog) on this pilot project. The anaerobic digester at this location generates about 550 Nm3 of raw gas with 55-60% methane. After the gas upgrading the resultant gas output is 330 Nm3/hour. This facility uses a water-wash system to upgrade biogas. The key steps include biogas compression, washing and CO2 removal (CO2 is soluble) and cleaned biogas utilization.
For every tonne of incoming waste they generate 0.3-0.35 tonnes digestate, which they dry and incinerate (they would require additional approvals to compost this material). www.rova.nl; www.dmt.nl (see photo)
Van Werven is a family owned company that got its start in the collection and recycling of construction and demolition wastes. In 2008 they started an innovative plant to collect, sort and granulate various rigid plastic streams and sell the resultant recycled plastics into various marketplaces. They focus on plastics generated at C&D sites but also receive loads of plastics from other plastic recyclers. They receive very little packaging plastic. Their process is deceptively simple. They manually sort the various plastics into their various resin types and then wash and grind these plastics. Where it becomes much more complex is in their lab where they test the various plastic resins as they strive to make very specific mixes for their various clients.
They now manage about 50,000 tonnes per year of plastic at this facility and a number of satellite facilities in the Netherlands and the UK (with a Belgian site coming on line soon).
The final two stops of our trade mission were in Lelystad, which is in the province of Flevoland. This province was previously ocean bottom and created about thirty years ago.
Orgaworld, whose Green Mills facility we had visited on our first day, has a tunnel composting facility in Lelystad. They compost organic waste from the City of Lelystad as well as other communities that belong to the municipal cooperative HVC.
Retour Matraas is a very interesting facility that recycles mattresses. This automated facility receives mattresses in 40m3 roll off containers (about 85 mattresses) from various municipalities. After receipt they are directed to a conveyance system. A ferrous metal sensor directs mattresses that include metal springs down one processing line with the balance being directed down a second line.
The mattresses are automatically cut around their perimeter to facilitate the removal of the various components. These components include polyester, nylon, cotton, foam and metal. Master inventor (and owner) Nanne Fiolle keeps refining this plant and is in the process of developing new locations. They are in the process of expanding the hours of operation at this facility. http://www.retourmatras.nl/?lang=en