Comment by chneu
Dairy farmers would never do this. The cost of LNG and methane are far, far too low to justify the costs of digestors, collection and infrastructure. Gasses are waste products that are usually vented to the atmosphere, even in the oil industry. They're dirt cheap.
I worked on a project to make a useful biomass from chicken shit. In the end, after years of research and viable product, it was axed because the upfront costs would always be too high for chicken farmers to adopt it.
The only way to get dairy ops on board would be to mandate it with regulation and then subsidize it. Cattle and dairy ops are massive welfare queens who resist change in every way they can, unless that change is more welfare.
We can't even get landfills to stop leaking/venting methane. No chance we get dairy ops to build methane capture systems.
I've had to build fire & gas detection systems for ~15 diary farm biogas operations in the last two years. It isn't even in our usual list of clients to work with, we just happened to have an oilfield client pass our name around and got calls for these systems a year or two later.
If our tiny company is getting requested to bid on life safety systems for biogas operations it must be a lot bigger of an industry than you believe it to be.