- Location
- North Norfolk
The original design came from Greenfinch. I think the separate gasholder was standard for them, it ties in with using gas mixing, for which a tank about the same height as diameter works. The ones with the gasholder in the roof are generally much greater diameter than height.
Don't worry about pasteurising for weeds, a week at digester temperature will kill blackgrass seeds ( see reports from Wrap - I think it might be in http://www.wrap.org.uk/content/digestate-and-compost-agriculture-dc-agri-reports ). You only need pasteurisation if you are using animal byproducts or food waste which might contain meat.
Don't worry about pasteurising for weeds, a week at digester temperature will kill blackgrass seeds ( see reports from Wrap - I think it might be in http://www.wrap.org.uk/content/digestate-and-compost-agriculture-dc-agri-reports ). You only need pasteurisation if you are using animal byproducts or food waste which might contain meat.