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CHP (combined heat and power) diesel engines.
114
However, the glycerine still
needs to be purified via distillation. Glycerine can be converted into biogas
through anaerobic digestion. Biogas is effectively a mixture of methane, CO
2
and water plus impurities of differing proportions.
115
The optimization of this
process can lead to the production of methane and/or hydrogen.
116
Methane
can be burned in CHP units or supplied to the gas grid, making anaerobic
digestion an attractive possibility for many biodiesel producers across the EU
in order to effectively valorize biodiesel glycerine.
117
Anaerobic digestion for
glycerine and also for liquid euent is an area of research interest as well.
d
n
9
r
3
n
g
|
0
d
y
y
f
n
n
3
.
6.6.4.3 Fermentation and Treatment of Euent
The bioconversion of glycerol into more valuable products, 1,3-propanediol,
biobutanol (1-butanol) and succinic acid amongst others, has been reported in
literature. Some of these routes have become commercial processes, currently
employed in industry (Scheme 6.4).
118
From succinic acid, a wide range of
Scheme 6.4
Key biotransformation routes from glycerol.
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