[Digestion] Fw: Purple Sulfur Bacteria.
Ken Calvert
renertech at xtra.co.nz
Mon May 21 04:55:24 CDT 2007
----- Original Message -----
From: "Ken Calvert" <renertech at xtra.co.nz>
To: "alastair ward (IGER-NW)" <alastair.ward at bbsrc.ac.uk>
Sent: Monday, May 21, 2007 12:34 PM
Subject: Re: [Digestion] Purple Sulfur Bacteria.
> Alastair, Been there done that!
A/. H2S is a lot more poisenous than one might think. A constant
atmosphere of only 50 parts per million around a leaky system, thats one
in 20,000 even though
you can barely smell it over several hours will make you very ill.
> B/. Even though it is poisenous to us there is a family of purple sulphur
bacteria that love it and only need a little light to assist them to grow
in the moist air and they will coat any clear surface with a heavy coat of
reddish purple colur and you won't see a thing! So any peepholes etc need to
be carefully covered when not in use. Cheers Ken C.
> ---
> -- Original Message -----
> From: "alastair ward (IGER-NW)" <alastair.ward at bbsrc.ac.uk>
> To: "Mike Walter" <sailingmike50 at hotmail.com>;
> <digestion at listserv.repp.org>
> Sent: Monday, May 21, 2007 9:27 PM
> Subject: Re: [Digestion] Digestion Digest, Vol 11, Issue 15
>
>
>>I don't think that the problem with H2S in biogas is the smell, unless you
>>are intending to release the gas into the air! It is more a problem with
>>the corrosion of metals, particularly copper alloys used in certain parts
>>of engines. I agree that running the gas through iron oxide in the form of
>>cans or wire wool will work. If you can put this in a clear container, the
>>black colour formed will show when it is time to change it.
>>
>> Alastair Ward
>>
>> ________________________________
>>
>> From: digestion-bounces at listserv.repp.org on behalf of Mike Walter
>> Sent: Sat 19/05/2007 03:49
>> To: digestion at listserv.repp.org
>> Subject: Re: [Digestion] Digestion Digest, Vol 11, Issue 15
>>
>>
>>
>> Thanks to Steve Rodda,
>> Greetings to you and New Zealand! When farmers transfer swine manure
>> around here one can smeel the H2S in a solid 2 mile radius. When I
>> consider the cubic feet...it boggles my mind. I believe we are the only
>> area in the US that has three super-fund sites of pollution. Michigan
>> would be at the north end of what it called the rust belt in the US.
>> Heavy Industry from WW ll into the present day has polluted the great
>> lakes area. General Motors, Dow Chemical and smelting iron ore over the
>> decades has really left a mark. Consequently, any refinery (of any sort
>> even a digester) would have to remove any trace of H2S because of the
>> public outcry. Generally speaking, people won't be employed by it. In
>> the past, for a job that pays like the auto companies people gave up
>> their lungs, backs and hearing to the factories.
>> You're correct about the insulation. I put two inches of foam under the
>> poured floor. Along the edges, I places another two inches of foam
>> vertically, 18 inches deep to redirect the heat that intended escaping
>> under the edges of the slab.
>> Excellent criticism on your part!
>> I know just the junkyard with shreaded iron shrouds to send the biogas
>> through. When I build my model, of a scrubber I'll send pictures and
>> results.
>> Thanks'
>> Mike Walter
>>
>>
>>
>>> From: digestion-request at listserv.repp.org> Subject: Digestion Digest,
>>> Vol 11, Issue 15> To: digestion at listserv.repp.org> Date: Fri, 18 May
>>> 2007 12:00:06 -0400> > Send Digestion mailing list submissions to>
>>> digestion at listserv.repp.org> > To subscribe or unsubscribe via the World
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>>> or, via email, send a message with subject or body 'help' to>
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>>> edit your Subject line so it is more specific> than "Re: Contents of
>>> Digestion digest..."> > > Today's Topics:> > 1. Re: delivering biogas in
>>> cylinders (adkarve)> 2. Home scale digesters (Steve Rodda)> >
>>> > ---------------------------------------------------------------------->
>>> > Message: 1> Date: Fri, 18 May 2007 08:35:45 +0530> From: adkarve
>>> <adkarve at pn2.vsnl.net.in>> Subject: Re: [Digestion] delivering biogas in
>>> cylinders> To: digestion at listserv.repp.org> Message-ID:
>>> <009001c798fd$094ae6c0$4d69fea9 at adkarve>> Content-Type: text/plain;
>>> charset=iso-8859-1> > Dear Mr. Bingham,> Being a habit forming drug,
>>> alcohol suffers from government restrictions on> production, storage,
>>> transport, sale and use. With alcohol, you are> mercilessly delivered to
>>> the whims of government officials, who demand> bribes at ever step. That
>>> is why I do not even think of alcohol.> Yours> A.D.Karve> > -----
>>> Original Message -----> From: Bingham <bingham at zekes.com>> To: adkarve
>>> <adkarve at pn2.vsnl.net.in>> Sent: Thursday, May 17, 2007 10:28 PM>
>>> Subject: Re: [Digestion] delivering biogas in cylinders> > > > What does
>>> ethanol sell for in your area? You can convert sorghum grain> into> >
>>> ethanol much faster and with smaller equipment. The DDG byproduct can
>>> be> > sold as fish feed or livestock feed or ran through a digester.
>>> The> highest> > and best use my be to convert the ethanol into cash and
>>> find a waste> product> > for the digester? If your customers need
>>> bottled gas for domestic use,> your> > basic business plan seems sound
>>> but Paul is right, the energy necessary to> > compress a mixture of
>>> biogas and CO2 may be much higher than you can> > imagine. It is my
>>> understanding a standard LPG ( propane )cylinder may not> > work.> > BB>
>>> >> > > > > > ------------------------------> > Message: 2> Date: Fri, 18
>>> May 2007 13:39:32 +1200> From: Steve Rodda <sancreed at hyper.net.nz>>
>>> Subject: [Digestion] Home scale digesters> To:
>>> digestion at listserv.repp.org> Message-ID:
>>> <464D03D4.6090902 at hyper.net.nz>> Content-Type: text/plain;
>>> charset=ISO-8859-1; format=flowed> > Principally to Mike Walter> Hello.
>>> I am wondering if you are about to make the mistake I did.> > >We live
>>> in the northern latitudes and our winters easily get to -20 degrees F.
>>> In trying to achieve the 95 degree F mark I am considering building the
>>> walls a piling dirt up to 6-8 feet up the sides. in order to take
>>> advantage of the consistent tempts below ground. > >> Below ground
>>> temperatures are constant - from what I have read, 5 > degrees C. The
>>> point is you need insulation also - otherwise there will > be major heat
>>> loss.> I didn't insulate beneath my digester and I can vouch that with
>>> cold > rains - the digester slows down.> Be careful with what you read -
>>> I followed the suggestion that the > ground would help prevent heat
>>> loss - didn't think and simply carried > on. Also didn't drain around
>>> it, as you can see!> > >Concerning scrubbers, one report I read says
>>> that drawing the biogas through composted cow manure can remove 85% of
>>> the H2S. > >> From what I understand , H2S is a small component - could
>>> say a trace. > Would you be contemplating a device that doesn't warrant
>>> the effort?> > >Another solid medium is a product called Iron Sponge but
>>> I've heard it "Rat Holes". This makes it inefficient. There are other
>>> products on the market. Many of these companies want to sell the
>>> equipment along with the medium. There are liquid scrubbers using
>>> ethanol. But I want to create a system I don't have to baby sit all the
>>> time. A passive system sounds more cost effective and easier to operate.
>>> > >> I use rusty cans crushed up-- rat holes? Maybe. However I have to >
>>> change the cans periodically (in my case a few months), but no baby >
>>> sitting. Certainly Passive!> > kia ora> (a greeting from New Zealand)>
>>> Steve Rodda> > > > > > > > > ------------------------------> >
>>> _______________________________________________> Digestion mailing list>
>>> Digestion at listserv.repp.org>
>>> http://listserv.repp.org/mailman/listinfo/digestion_listserv.repp.org> >
>>> End of Digestion Digest, Vol 11, Issue 15>
>>> *****************************************
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