[Digestion] slurry from Potassium hydroxide catalyzed glycerin

[Douglas Renk]

Has anyone demonstrated the effect of introducing marine anaerobes highly toleratant of sodium into glycerin by-product enhanced digesters? Sodium may still be of concern for land application, but perhaps the digester could remain stable. I recall some studies about 20 years ago with Chynoweth at IGT for inoculum suited for sea kelp digestion. 
 
Any experience with this may greatly help our biogas industry with co-digestion of biodiesel glycerin. I find the industry resistant to move away from sodium hydroxide catalyst.
 
Thanks,
Doug Renk
 
 


________________________________
From: Steve Verhey <verheys at hotmail.com>
To: digestion at lists.bioenergylists.org 
Sent: Wednesday, January 4, 2012 8:24 AM
Subject: Re: [Digestion] slurry from Potassium hydroxide catalyzed glycerin


We have fed post-biodiesel potassium-glycerin to a large dairy digester. Our reasoning for using KOH instead of NaOH is the same as yours: K+ is a nutrient, Na+ is a pollutant. We don't have numbers, but I don't see why the recovery of K wouldn't be quantitative -- in this case, what goes in, comes out.



________________________________
Date: Wed, 4 Jan 2012 10:15:15 +0200
From: waynezschech at calvarychapel.com
To: digestion at lists.bioenergylists.org
Subject: [Digestion] slurry from Potassium hydroxide catalyzed glycerin

G'day All,

We are looking to use our glycerin byproduct from biodiesel production in our digester.  The question arises as to the sodium influence on the liquid slurry.  Does anyone have any experience in this area?  We are thinking that although potassium hydroxide is more expensive as a catalyst, it will produce a better quality fertilizer. Does anyone know how this would affect the end NPK reading of the fertilizer? 

Blessings,
Wayne

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