Get a 55 Gallon Metal barrel with sealed top and a 14-25 gallon barrel as well.
On the 55 gallon drum, cut off the top about one foot below the rim.
Drill Holes in the bottom of the barrel.
Cut flaps into the lid as seen below and fold them alternately in and out using a hammer.
When the top is placed on it should leave a 1/2 inch gap all the way around.
Cut 8 Pizza slice size pieces by making 4 cuts. Fold the metal up.
Using two cuts make Four pizza slice size cuts in small barrel. This will be your afterburner.
Now it is time to fire it up. Place your dry biomass into the barrel and start a fire on the top.
Rake the coals over the top of the biomass, then place the top on. After this place the afterburner on top of the upward pizza slices to further direct the heat upwards.
The fire will continue to burn for about an hour depending on the biomass you put in.
After it has burned down, dump out the biochar and hose it down with water. It will look like this:
Increase plant growth
Sequester Carbon
Disposal of Biomass