[Digestion] slurry from Potassium hydroxide catalyzed glycerin

[Steve Verhey]

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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