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I used an 80L reactor (ie .08 m^3) filled with lawn clippings, water and cow manure. The gas was bubbled to an upside down drum floating in water. That created mild pressure (less than 2 bar I suspect) to send the gas to burners when the valve was opened. I will say that the muck cleaned out of the digester was an excellent plant food. A good job for 'guest workers'.
I think those landfills, dairies and sewage farms who can exploit biomethane are already doing it. If food production becomes localised then waste recycling will be essential for nutrients (ie NPK) with methane as a secondary consideration. This is clearly not something that most people want to do. Unlike coalfired electricity it's up close and personal, not out of sight, out of mind. The suburban lifestyle is dedicated to being clean, dry and odour free.
I'd be very surprised if all Australian landfills are using biogas right now.
While I don't think biogas has a future for individual suburban dwellings, I think it would work fine for rural properties of sufficient size.
And I think all municipal waste should be separated into organic and non-organic streams - use the organic stuff for producing biogas and fertiliser, recycle the rest.
Again, I'd be very surprised if more than a small fraction of local councils do this (worldwide) do this thoroughly and effectively.