[Digestion] slurry from Potassium hydroxide catalyzed glycerin

[Andrew Ward]

I am currently doing my phd studies on high salinity digestion under the supervision of David Lewis and Paul Harris. I am currently digesting marine micro algae at a salinity of 7% (2 x seawater) I am getting good gas production and results loom positive. I have undertaken DGGE community profiling of the bacterial community and have isolated several high salinity methanogen bacteria that tolerate high salinity. I will be running several bio methane potential assays looking at co- digestion of glycerine bi-products from biodiesel production. I will keep you informed of my results and journals were results will be published. 
             Cheers Andrew 

Sent from my iPhone

On 05/01/2012, at 1:45 AM, Douglas Renk <douglasrenk at yahoo.com> wrote:

> 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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