AW: DIG-L: overloaded reactor

[Ernst Murnleitner <MUR@lfp.blm.tu-muenchen.de>]

Dear Stephen,

 

as carbon dioxide is produced and outgoing in the acidification stage and as the pH is > 7, there is not much carbon dioxide in the methane reactor - therefore we have still > 50 % Methane. A well performing reactor could easily have > 70 % Methane, as the fat has a high methane yield.

 

In the acidification, we have 8 g acetic acid and 1.5 g/l propionic acid, in the methane reactor it is vice versa. I guess, propionate is produced from the long chain fatty acids with odd numbers of carbon atoms and, maybe, from the glycerol. For me, it seems, that the reactor operates still well until 4 or 5 g/l propionate is reached.

 

Greetings, Ernst Murnleitner