[Digestion] Removal of hydrogen Sulphide from biogas

[alexanderb.eaton at gmail.com]

It is also important that you change motor oil about 2x more frequently than indicated by engine manual.  Also, iron sponges do not work unless they are heavily oxidated, rusted. The reality of these filters at a small rustic scale is a pretty limited functionality.  Finding ferric oxide powder and embedding in  a medium like sawdust or charcoal works better.  Change frequently.  There are mass balance equations that will allow you evaluate how big the filter should be, how much ferric oxide, how much rentention time is needed for your gas flow and sulphur content. As Paul says, if the digester is in good function, the actual amount could be quite low.  Generally higher with pig manure where high protien diet or feeds with sulphur addition is used.

Good luck!  We have someone developing projects in Nigeria now, and could work on sending a filter over.  Also Joaquin Viquez, who should be on this list, was just there and may have some contacts that could help.  Joaquin also has some really useful data and published work on the subject.    

Best

A 
Sent via BlackBerry by AT&T

-----Original Message-----
From: Paul Harris <paul.harris at adelaide.edu.au>
Sender: digestion-bounces at lists.bioenergylists.org
Date: Tue, 25 Sep 2012 21:01:06 
To: For Discussion of Anaerobic Digestion<digestion at lists.bioenergylists.org>
Reply-To: For Discussion of Anaerobic Digestion
	<digestion at lists.bioenergylists.org>
Subject: Re: [Digestion] Removal of hydrogen Sulphide from biogas

G'day Isiaka,

Hydrogen sulphide should be very low unless you are overloading the 
digester or are adding sulphur from protein(?). To make sure passing the 
gas through a steel wool pack works quite well (it can be regenerated if 
necessary). As far as corrosion of the motor you need to consider the 
cost of scrubbing (capital, operation and maintenance) compared to the 
slightly reduced engine life, accepting that the exhaust gases will be 
slightly acidic as well.

Happy digesting,
HOOROO

Mr Paul Harris BEng (Ag) (Melbourne)
Visitor at The University of Adelaide

On 25/09/2012 3:26 PM, Isiaka Taiwo wrote:
> Dear sir,
>
> I am an Electrical Engineer from Nigeria.
>
> I am working on biogas application on farm and low / middle class homes.
>
> My objective is to use biogas for cooking, running of small power generators and lighting of gas lamps.
>
> I have accomplished the production of biogas from my biogas digester, and I have burnt the gas and it gave blue flame.
>
> I have also converted a petrol generator to gas generator with a converter I bought in country.
>
> I am delaying the test of the generator with biogas because of the corrosive effect of the gas which I learnt can damage the generator. Also , I want to protect lives of the stakeholders as the hydrogen sulphide is also poisonous.
>
> I am looking for simplest and easiest do it yourself (DIY) way(s) to eliminate hydrogen sulphide from biogas and I think you can be of assistance.
>
> I don't mind suggestion of suppliers of any ready made solution.
>
> Please , I am waiting for any assistance or useful information that will help in realisation of my set objectives.
>
> Thanks for the anticipated assistance and supports.
>
>
> Isiaka Taiwo
> Sent from my BlackBerry wireless device from MTN
>
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for more information about digestion, see
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http://www.adelaide.edu.au/biogas/
and the Biogas Wiki http://biogas.wikispaces.com/