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Hi Rolf,
The diving industry uses compressors with these
pressures. One popular manufacturer is Bauer (Germany).
Separation of CO2 from methane is very difficult
and expensive. In the natural gas industry it is done by a chemical
process using amines or potassium carbonate. Membranes can also be used,
but you will not get 98% methane. Both methods are expensive and totally
unsuited to small-scale methane plants.
Regards,
Jim Bland
Melbourne
----- Original Message -----
Sent: Friday, November 10, 2000 7:43
AM
Subject: Re: [biofuel]
manure-digester
Hi there,
The info is great Stephen, I have a question you may have an answer for.
How do I separate the CO2 from the methane, in an inexpensive manner? My goal
is about 98% methangas...any ideas? Does anyone know of any supplier of
compressors capable of 3000psi or so? I would like to clean the gas, compress
it and run a vehicle from it. I have found used tanks and such good for 3600
psi.
Sincerely, Rolf Forslund
stephen lakios wrote:
I can throw out some loose figures for a cubic yard of
manure.Without knowing the urine content and how much carbon in the form of
straw-cellulistic materials are involved, they will be ballpark figures
only.It seems to me the manure would be better utilized in a digester.A
cubic yard would approach one ton, depending on liquid content-higher,or
straw content-lower.The amount of methane production depends on many
factors. But raw manure will produce less methane, than a manure-cellulose
mix.Say we have 1,800 lbs of manure, straw,and waste feed in unknown
proportions,but mostly manure. This would have about 300 lbs of volatile
solids.At 2.5 cubic feet of methane per lb of vs =750 cubic feet of methane
or about 1,500 cubic feet of biogas, which can be burned directly.Fuel value
of methane is about 1,000 btu's per cubic ft. Biogas is about 600 btu's per
cubic ft.Depending on who's chart you read.Also the methane content of vs is
highly variable.Ranging from .8 for raw cattle manure, to 5 for a mix of 1/3
chicken manure,and 2/3 paper pulp.And the biogas content is even more
variable.It is impossible to arrive at firm figures, you will not know
untill you try each mixture.I belive a manure-cellulose mix is best used to
produce biogas or methane.If it were a large operation you could compress
the CO2 for sale,bottle and sell the spent slurry,dry the sludge,bag and
sell it or use as fuel.And you are still getting the gas.Stephen
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