[EMAIL PROTECTED] wrote:
Hi Rich
The use of compostingas the pre
treatmenthave several disadvantages.Instead
ofselective 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
alsolooking 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
ofthe ethanol creation process?
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--
Pagandai V Pannirselvam
Universidade Federal do Rio Grande do Norte - UFRN
Departamento de Engenharia Qumica - DEQ
Centro de Tecnologia - CT
Programa de Ps Graduao em Engenharia Qumica - PPGEQ
Grupo de Pesquisa em Engenharia de Custos - GPEC
Av. Senador Salgado Filho, Campus Universitrio
CEP 59.072-970 , Natal/RN - Brasil
Residence :
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Q6/Bl.G/Apt 102
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EP 59.078-400 , Natal/RN - Brasil
Telefone(fone ) ( 84 ) 3215-37690 Ramal210
32171557
Telefone(fax) ( 84 ) 3215-3770
residencia 32171557
Cellular8488145083
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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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