posted 4 hours ago
It might behoove you to read about these systems. They use a flush toilet indoors , then a special compost collector outside that can provide usable biogas for cooking. Here is one such system for a DIY approach, and a ready made product exists from homebiogas.com.
While I can't confirm their efficacy in a Norwegian winter, at least you could cite their track record to your municipality
Screenshot_20251007_072315_Samsung-Internet.jpg
Screenshot_20251007_071820_Samsung-Internet.jpg