I confirmed biochar production by physical appearance (Full black colour without brownish shade). But, is there any scientific method to confirm?
Ultimate analysis can confirm C, H and O content to see where it is on a van Krevelen diagram.
Thank you for your reply. May I know how to confirm the formation of biochar using van Krevelen diagram?. Please elaborate.
Well, we call it hydrochar. If it is in the region of coal or lignite on a van Krevelen diagram, it would be considered hydrochar.
Effect of Hydrothermal Carbonization Reaction Parameters on the Properties of Hydrochar and Pellets
By: Yan, Wei; Hoekman, S. Kent; Broch, Amber; et al.
ENVIRONMENTAL PROGRESS & SUSTAINABLE ENERGY Volume: 33 Issue: 3 Pages: 676-680 Published: OCT 2014 has more details
At present, there are no commercially operating biochar production systems on which to base an assessment. There are numerous laboratory-based technologies for producing small amounts of biochar for experimental purposes. These systems are not generally useful for evaluating scaled-up production facilities because cost and environmental performance are usually inconsequential in the laboratory. These systems have been used to produce chars from many different feedstocks and have yielded important insights into how temperature, pressure, heating rate, and treatment time affect the decomposition of biomass into char, bio-oil and synthesis gas—commonly referred to as syngas. In addition, they have provided char used in small-scale pot studies and so have contributed information on the agronomic properties of certain chars. Biochar characteristics are variable, depending on the feedstock and the processing methods used. In addition, a biochar’s agronomic impact will depend on the soil type and the crop grown. In other words, each feedstock-conversion application combination presents a unique situation. Work has begun on a biochar classification scheme that may ultimately yield a useful predictive system, but at the present time, chemical analysis of individual chars combined with field trials are the only tools available for evaluating biochar impacts
https://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=64&cad=rja&uact=8&ved=0CDUQFjADODw&url=https%3A%2F%2Fwww.nrdc.org%2Fenergy%2Ffiles%2Fbiochar_paper.pdf&ei=tdsLVfr-LNHxarP2gsgE&usg=AFQjCNFeNVegPzmBhiVSZQZXykI4YgoyKg
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