[permaculture] biodiesel wash water biological filtration
Paul d'Aoust
paul at heliosville.com
Sat Sep 27 01:48:55 EDT 2008
This answer will probably be too vague for you, but I'm tossing it out
there anyway -- if you use the one- or two-stage base process, you only
have to worry about NaOH, glycerol, and a bit of stray methanol. The
latter two, as organic compounds, should be easily absorbed by most
plants. Too much NaOH will, of course, toast your plants, but if you add
some phosphoric acid to the wash, as mentioned in
http://journeytoforever.org/biodiesel_bubblewash.html#dispose it will
convert it to phosphates, which are safe but (as we all know) are great
fuel for algae, so you'll probably want to make sure the water level in
your reed bed doesn't reach the surface of the gravel.
If you use a two-stage acid/base process, you don't need to worry about
NaOH at all; the sulphuric acid combines with the NaOH to make sodium
sulphate, which is a common soluble fertiliser.
Hope this helps!
Paul
El mié, 24-09-2008 a las 12:10 -0400, Brooks Miller escribió:
> anyone have any experience with biological filtration of biodiesel wash
> water? specifically i'm looking for plant substrates and species of plants
> for consideration. thanks for your help.
>
>
> brooks
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