At the lower sites, charcoal particles reflect the more recent vegetation probably because the repeated fires here hindered their preservation.
Biomass loss by wood harvested for fuelwood (upper), total subsistence (middle), and charcoal (lower) plotted against distance to nearest settlement.
At higher rates of coke breeze energy substitution with charcoal, the lower sintering performance observed was mainly attributed to the lower fixed carbon content and higher volatile matter content of the fuel mix.
Greater charcoal and lower charred seed values are interpreted to represent a wooded environment, while higher amounts of charred seeds and minimal wood charcoal suggest a much great use of dung as a fuel source.
This study demonstrated that using this method, P desorption rates of 70 80 % were obtained, which was sufficient to achieve the desired concentration of P. The study also revealed that a higher concentration of K was extracted from rice straw charcoal at lower pH values, while the extraction efficiency ranged between 60 and 70 % at pH values ranging from 3 to 13.
Concomitantly, several research projects, as e.g. the EU project "Poseidon" [1], the Swiss project "Strategy Micropoll" [2] or long-term activities of NORMAN network (http://www.norman-network.net/) have investigated the efficiency of different technologies in WWTPs, as e.g. ozonation or charcoal filters, to lower concentrations of micropollutants in surface waters.
Lower fire (if using wood chips and charcoal, move them to each side).
It was a square box, divided in two, so that charcoal could burn in the lower compartment while cookies baked in the upper one.
"It's amazing what Thai cooks can accomplish in such rudimentary kitchens," Mr. Ricker said, as we watched the cook use a crude pulley system to raise and lower a meat-covered rack over glowing charcoal.
