Green gas production from biodegradable waste

What does a biodigester do? Briefly, with biodegradablefood waste (gfe) you feed a colony of bacteria. These bacteria produce biogas and "digestate," which is a liquid compost. 

We have a micro-digester in mind, see here. 
 
It's a kind of tent containing a 'soup' of bacteria. You put food scraps in the horn on the left and gas and liquid compost comes out. With that gas you can cook directly with the supplied gas burner, see picture. You can drain the digestate and feed it to your plants. 

This bio-digester is fragile, though. Moreover, the colony of bacteria works best at about 20 degrees Celsius. This is a problem in the Netherlands during the winter period. Therefore, we will place the digester in a container or shed, which is well insulated and ventilated. We will also built a canopy for the outdoor kitchen, which will function also as a reception and education area.

In addition, we want to realize an "off grid / low tech" heating system. We are thinking of a biomeiler. This is basically a large volume of wood chips that will 'naturally' heat up. With a water hose you can transport that heat from the biomeiler to another place. The idea is that in the winter we can use the heat from the biomeiler to keep the biodigester up to temperature. This combination is special, but it has been used before in Germany. 

The great thing is that a biomeiler also works with bacteria, but in a different way. Both processes are natural and they support each other. With a biomeiler you not only produce heat, but also compost. We want to add the digestate from the biodigester to the biomeiler. This way, the digestate from the biodigester is also hygienized. 

The setup consists of three parts: a bio-digester; an enclosure + outdoor kitchen; and a biomeiler. With this setup, we can engage school children and our neighbors in the importance of separate collection of gfe/t. This project touches on the objectives of the City of Amsterdam in terms of 
A) the energy transition (biogas instead of fossil gas); 
B) of the green transition (the sustainable production of bio-compost suitable for city gardens and vegetable gardens); 
C) and of the circular transition (from gfe via compost back to edible vegetables). 

We want to achieve that more residents are aware of their food and food waste and participate in separate collection of biodegradable food waste.