Small-scale, straightforward, inexpensive Biochar production is a valuable component in many grassroots paths to ecological sustainability.
Charcoal production for soil amendment is an attractive option for horticulturists in most growing conditions, if suitable feedstock is readily available.
While elaborate, custom, high-volume systems have been designed and implemented, it is not unlikely that the greatest quantity of biochar will be produced in small, simple, low-cost, semi-mobile systems assembled in 'DIY' fashion from available materials.
The following project description documents one such replicable model, based on the common 55 gallon steel drum.