[Digestion] Mixing in digesters?

[Harmon Seaver]

   Someone just posted that  "well-stirred digesters with mixed contents
will always out-perform single feedstock digesters by volume". Sometime
back, when I asked about having a mobile digester (to provide fuel for a
 motorhome and process waste), I was told that it would not work because
disturbing the digester would cause it to stop working.
    So is mixing bad or good?

-- 
Harmon Seaver