[EMAIL PROTECTED] wrote:
Hi Rich
The use of composting as the pre
treatment have several disadvantages.Instead
of selective removal of lignin the hemicelluose and
cellulose are significantly lost as well as the long processing time
, the need for mixed inoculations and also as the problem
of contamination.
Surley yet this method can be apropriate for rural areas
sd
Pannirselvam
/18/05, Rich <[EMAIL PROTECTED]>
wrote:
> I am looking at the second chapter of Mother Earth Alcohol Fuel
-Raw
> materials chapter at
> http://journeytoforever.org/biofuel_library/ethanol_motherearth/meCh2.html#2_1.
> At the "Crop Residue" part, it says:
>
> "The "backbone" of sugar and starch crops -- the stalks and
leaves -- is
> composed mainly of cellulose. The individual six-carbon sugar
units in
> cellulose are linked together in extremely long chains by a
stronger
> chemical bond than exists in starch. As with starch, cellulose
must be
> broken down into sugar units before it can be used by yeast to
make ethanol.
> However, the breaking of the cellulose bonds is much more complex
and costly
> than the breaking of the starch bonds. Breaking the cellulose into
> individual sugar units is complicated by the presence of lignin, a
complex
> compound surrounding cellulose, which is even more resistant than
cellulose
> to enzymatic or acidic pretreatment. Because of the high cost of
converting
> liquefied cellulose into fermentable sugars, agricultural residues
(as well
> as other crops having a high percentage of cellulose) are not yet
a
> practical feedstock source for small ethanol plants. Current
research may
> result in feasible cellulosic conversion processes in the
future." I am
> also looking at Stu Campbell's book "LET IT ROT! The gardener's
guide to
> composting, Revised edition. My question is since composting does
a good
> job of breaking down lignin, would it be possible to use
composting as part
> of the ethanol creation process?
>
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>
--
Pagandai V Pannirselvam
Universidade Federal do Rio Grande do Norte - UFRN
Departamento de Engenharia Química - DEQ
Centro de Tecnologia - CT
Programa de Pós Graduação em Engenharia Química - PPGEQ
Grupo de Pesquisa em Engenharia de Custos - GPEC
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The purpose of conversion to ethane is to extract energy from matter,
right? Composting produces heat (energy) right? Why not just use the
heat energy directly for diverse purposes? Every time energy is
transformed from one state to another, there is a loss. Reducing the
number of energy transitions from raw to usable should reduce the
losses incurred in the process. Why not a composting engine?
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