Biogas compression

The available information online about taking biogas (from a bio digester) and using a compressor to transfer the methane from a "bag/rubber membrane" to a propane cylinder is sparse and sketchy at best. At least what I can find anyway.
Has anyone here done it before?

All I can find are videos like this.
https://youtu.be/lp77jp6_cSM

And another where a guy uses a fridge compressor.

Hmm, at our school we've been halfway trying to make biogas for years, so I've thought and read about it a lot. I think one issue is, it tends to be not at all pure fuel gas. It has a lot of moisture and other gasses in it. We remove the smelly sulfur gas that causes corrosion in metals by passing it through a chamber of steel wool, and sometimes we've had a condensing chamber that works in cold weather to remove some of the moisture. But even then I feel maybe it's not an intense enough fuel to try to bottle it. Better to store in a big tank or bladder and pipe it to the usage site. But of course your situation might be different.

Rebecca Norman wrote:Hmm, at our school we've been halfway trying to make biogas for years, so I've thought and read about it a lot. I think one issue is, it tends to be not at all pure fuel gas. It has a lot of moisture and other gasses in it. We remove the smelly sulfur gas that causes corrosion in metals by passing it through a chamber of steel wool, and sometimes we've had a condensing chamber that works in cold weather to remove some of the moisture. But even then I feel maybe it's not an intense enough fuel to try to bottle it. Better to store in a big tank or bladder and pipe it to the usage site. But of course your situation might be different.

You are not alone in this. I was at a 1 megawatt biogas generating site (dairy farm digester) and their giant engine kept shutting down because they had impurities in the biogas that was being generated.