I have been looking around for some kind of small-scale anaerobic digesters that would be capable of producing methane, something that the home brewer could build and use (perhaps to power a gas hot-water heater to pre-heat oil).
Altho there's lots of general info on digesters (good links on this forum - thanks Legal Eagle), so far i haven't found anything specific to glycerin. There are a couple of interesting studies here:
There's also a discussion here:
I would be interested if anyone on this forum has actually tried using small-scale digesters (ie homebrew - not municipal wastewater) specifically for glycerin. From the research it definitely seems quite possible.
I would imagine that the glycerol would have to be well diluted for bacterial action as it has a preservative effect, rather like sugar does in preserved fruit. Otherwise it tends to attract molds.
glycerol to methanol
glycerol to ethanol
glycerol to hydrogen
The top link you posted is specific to glycerol to methane. Many have found that water treatment plants will take the methanol laden glycerol to add to the slurry as it makes the bugs happy and gets them a better methane yield. That said, I think you will find that in order to get to where you want to go you will have to mix the glyc with some sort of organic matter, not unlike the water treatment folks. Cow crap is good, as is pig crap but it is very high in hydrogen already.
Simple anaerobic digesters are not that complicated IF you have the time to babysit them.
Basics of Biogas
Building a Biogas Digester
** Biodiesel Glycerine Soap - The Guide
- on 5 continents helping people make & sell soap from the Biodiesel Glycerine.
the reason i like the idea of a digester is its inherent simplicity. Yes, i understand that there would have to be some other form of input to give the correct C:N ratio. All my glycerin is liquid at room temperature.
regarding glycerine to methanol - what an exciting technology..it would be a great use for our byproduct.
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