Why are you re-using the biochar?
I thought the whole point of biochar is that it's cheap.
If you're having repeatability issues, it might be that the biochar is not very homogeneous.
Sometimes you pick up big particles, sometimes small. For the same mass, you get a big variability in surface area (and hence absorption capacity)
The solution to that is sieving the particles so you get better size distribution
For example, use only particles caught between mesh size 60 and 70; corresponding to 210-250 micron particles.
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u/Bugfrag 4d ago
Why are you re-using the biochar? I thought the whole point of biochar is that it's cheap.
If you're having repeatability issues, it might be that the biochar is not very homogeneous. Sometimes you pick up big particles, sometimes small. For the same mass, you get a big variability in surface area (and hence absorption capacity)
The solution to that is sieving the particles so you get better size distribution
For example, use only particles caught between mesh size 60 and 70; corresponding to 210-250 micron particles.