Looks like you have since received the answer (doesn't provide anywhere near the amount of gas needed) in the comments to your post:

*HomeBioGas system for Bitcoin mining* 
https://stacker.news/items/91454

BTCMiner

Has anyone checked out this system for generating biogas from food leftovers and human stool?

If so, does it generate enough gas to fuel a generator to mine Bitcoin?

https://www.homebiogas.com/

bitcoin

Mining with Biogas

Has anyone checked out this system for generating biogas from food leftovers and human stool?
If so, does it generate enough gas to fuel a generator to mine Bitcoin?

This is the system I'm talking about:
https://www.homebiogas.com/
