Dear Manuel Quoting MANUEL BARBA <[email protected]>:
SIRS MAY BE SOMEBODY MAY AWSWER FOLLOW QUESTIONS: 1.-ABOUT PYROLISIS OF BIOMASS,
# Lets assume that the charcoal is being made in a sealed Retort, with external heating.
*TAR ARE SAME DEFINITION OF VOLATILE GAS WHEN BIOMASS IS USED LIKE FUEL
# The "Pyrolysis Gas" coming off the retort is actually a mixture of solids (char particles and ash, liquid products (heavy and light tars, methanol, water vapor, methanol vapor, etc), and non-condensible gases, (CO, CO2, N, CH4)
*CHAR IS THE SOLID WASTE AFTER PYROLISIS?
# The Char remaining after pyrolysis is a combination of pure charcoal, residual high temperature chars that did not leave the retort with the pyrolysis gases, and ash.
*BIOCHAR ARE SOLID RESIDUES FROM PYROLISIS AND ARE SAME OF SOLID WASTE INCLUIDING ASH AND IT CAN BE USED AS A ORGANIC ENHANCE OF SOIL CALLED THE "TERRA PRETTA"
# The solids remaining after pyrolysis are generally termed "charcoal." It has many uses, for example, as a fuel, for medicinal purposes, for adsorption of gases and liquids, and for use as a "soil improving agent." When such charcoal is sequestered, such as being dumped down a mine shaft, or when mixed with the soil, the carbon content is mostly removed from teh Biosphere, and the overal consequence is that CO2 is removed from the atmosphere.
# When Charcoal is added to the soil for the purpose of improving "soil function", it is being used as it was used to produce Terra Preta soils, and it can be termed "Biochar". However, charcoal is NOT Terra Preta... it is one ingredients of Terra Preta. Simply adding only charcoal to a marginal soil probably will not result in an "agricultural improvement", in that the charcoal will tend to hold on to some of the available nutrients, making them unavailable for plant growth.
# Note that teh ash components of Biochar can be very beneficial to some soils, by raising the pH to a level appropriate for the crop being grown. On teh other hand, "High Ash Biochars" could be harmful to "good soils" if the pH is raised to an undesirable level.
On teh overall, Biochar additions can be beneficial, if they bring to the soil a property that the soil requires.
Best wishes, Kevin
THANKS
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