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Faire rouler nos voitures avec des déchets ?

Article publié le 2 février 2009

L’idée semble saugrenue, mais on pourrait bientôt faire tourner le moteur de nos voitures avec des déchets, des résidus de bois, des boues ou même du carton. La compagnie Enerkem développe actuellement un procédé qui permet de transformer ces matières en éthanol. Cet éthanol, appelé éthanol cellulosique, pourrait très bien remplacer l’éthanol-maïs qui sera ajouté dans l’essence traditionnelle à partir de 2010, sans avoir autant d’impacts négatifs sur l’environnement. A utiliser avec modération bien sur...
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Déchets Energie Pollution Energies renouvelables Carburants

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16 votes

votez :
par Olivier Daniélo (IP:xxx.xx9.21.153) le 2 février 2009 à 16H21

L’éthanol plus polluant que l’essence

votez :
par Olivier Daniélo (IP:xxx.xx9.22.172) le 4 février 2009 à 02H31

"Des chercheurs de l’Institut Fraunhofer ont mis au point une unité de production de biogaz fonctionnant exclusivement aux déchets de céréales. Les tiges de maïs contiennent de la cellulose qui ne peut être directement mise en fermentation. Mais dans notre usine, la cellulose est brisée par des enzymes avant la mise en fermentation." (...) La biomasse est habituellement conservée en cuve de fermentation pendant 80 jours. Ici, le pré-traitement de la biomasse réduit cette phase à 30 jours, ce qui renforce l’efficacité générale du système. Les chercheurs parviennent ainsi à générer 30% de biogaz de plus que les procédés existants. Une pile à combustible à haute température vient compléter le dispositif en convertissant le gaz en électricité, avec une efficacité de 40 à 55% (...)"

"Electricity from straw - Researchers have developed the first-ever biogas plant to run purely on waste instead of edible raw materials — transforming waste into valuable material. The plant generates 30 percent more biogas than its predecessors. A fuel cell efficiently converts the gas into electricity (...) If the electrical and thermal efficiency are added up, the fuel cell has an overall efficiency of up to 85 percent (...)" -

Déchets non comestibles cellulosiques - > électricité + chaleur. Rendement global de 85%...Vraiment intéressant.

Voilà la manière la plus efficace de valoriser les déchets. Bravo aux chercheurs du Fraunhofer.

Bien plus intéressant (et de très loin !) que de produire à partir de ces déchets cellulosiques de l’éthanol cellulosique dont la combustion dans un moteur tehrmique à faible rendement viendra empoisonner l’air que nous respirons. Les déchets cellulosiques, il en vient d’importantes quantités de l’industrie agro-alimentaire. Plutôt que de les valoriser en éthanol cellulosique comme cela commence à se faire, la voie présentée est bien plus pertinente (quand on brule l’éthanol ensuite dans un moteur thermique, on pollue à max ; ici, on obtient électricité + chaleur, avec un haut rendement global). Et on obtient en sortie de méthaniseur (en plus du biogaz), un engrais pour les cultures.

votez :
par chlorliscastcant1981 (IP:xxx.xx6.50.24) le 31 juillet 2013 à 23H26

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votez :
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votez :
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