The role of biochar in some ways can
indeed be substituted with other materials, for example for the ability to
retain water, cocopeat is better than biochar, for the surface area with the
number of pores the activated charcoal is much larger than the biochar, and to
raise the pH for the soils acid then dolomite lime better. In an application in
the field of planting media engineering to obtain the best agricultural media
is very likely use a number of materials mentioned above. Optimal results can
be obtained based on soil characteristics and plant species. Economic factors
are also an important consideration factor after the above technical aspects.
Modern biochar production currently
uses thermochemical processes continuously. There are two thermochemical
technologies for biochar production namely pyrolysis and gasification.
Pyrolysis technology is more widely used because it produces more biochar and
better quality. Why with pyrolysis can get 2 things? This is because basically
(slow) pyrolysis is a technology used for the production of charcoal or
maximizes its solid product, so the process control is also designed for that
purpose. While the gasification is designed to maximize its gas product, so the
char is only positioned as a by-product. The operating temperature of
gasification is also higher (800 C) than pyrolysis (450 C) so that the char is
also mixed with ash.
More specifically the indirect heating pyrolysis technology is more widely used for biochar production today. With this technology the pyrolysis process control is easier and the charcoal quality is also better. Application of indirect heating pyrolysis technology for continuous process generally use rotating drum and heated auger type. Biochar production capacity is generally in the range of 2-4 tons / hour. The byproducts of the pyrolysis process are also of high economic value such as bio-oil for fuel, pyroligneous acid (liquid smoke) for fertilizer and biopesticide, as well as syngas for fuel and more specifically for electricity production.
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