That would be bad, but it isn't a food or a paper, and its normal breakdown products are carbon dioxide and water. You can absolutely get it to break down as methane, but for that to be effective you have to pretreat the waste to make that happen, in a presumably separate waste stream.
There are a few ways to do that - you can find plenty of studies showing how much more quickly PLA breaks down if you do it - and they measure the effectiveness of of these methods by rate of methane production.
What I'm suggesting is that accellerating breakdown to produce more methane is a bad idea. That putting PLA in an ordinary landfill of collected garbage, which doesn't get that treatment, leads to a breakdown path which is both more conventional and much, much longer, and more water/CO2 than methane.
(The PLA hydration reaction gives you formic acid and OH- which ends up back to carbon dioxide and water. So water doesn't seem to be a problem.)
no subject
There are a few ways to do that - you can find plenty of studies showing how much more quickly PLA breaks down if you do it - and they measure the effectiveness of of these methods by rate of methane production.
What I'm suggesting is that accellerating breakdown to produce more methane is a bad idea. That putting PLA in an ordinary landfill of collected garbage, which doesn't get that treatment, leads to a breakdown path which is both more conventional and much, much longer, and more water/CO2 than methane.
(The PLA hydration reaction gives you formic acid and OH- which ends up back to carbon dioxide and water. So water doesn't seem to be a problem.)