[Digestion] landfill gas vs. controlled anaerobic digestion

[Jason Perry]

There is a landfill in northern New York that is in the process of 
setting up a system to collect landfill gas for generating electricity. 
Yard & garden waste and wood waste are separated and not added to the 
landfill. Currently there is no mechanism for separating domestic or 
commercial food waste in the district served by the landfill, so unless 
it is voluntarily separated at the source one can assume that it all 
goes in the landfill.

What anaerobic digestion conditions can be assumed to exist in the 
landfill? Is it essentially a psychrophilic digester?

Is it safe to assume that there would be more beneficial to 
source-separate the food waste and divert it to a controlled (meso- or 
thermophilic) anaerobic digestion plant?

Any ballpark ideas as to how much methane can be collected and used from 
a given amount of food waste degrading in a landfill compared to its 
ultimate potential methane yield?

Cheers,
Jason Perry