To control pollutant emissions from the combustion of both domestic stoves and small-capacity
industrial boilers, an artificial solid fuel called biobriquette has been developed. It is manufactured
from a mixture of coal, biomass (sawdust), and desulfurizer under a high compression pressure.
In this study, the combustion experiments were performed to elucidate the ignition and combustion
characteristics of biobriquette. Comparisons were made between coal briquettes and biobriquettes
for their combustion efficiencies and pollutant emissions in existing domestic stoves. Byproduct
in the gas welding industry was used as a new desulfurizer in the biobriquette, and its
desulfurization characteristics were studied. The experimental result shows that the biobriquette
has a lower ignition temperature and a higher combustion efficiency than the coal briquette.
The new desulfurizer was found to be more effective in desulfurization than the other two
desulfurizers, limestone and scallop shell. It is also found that the biobriquette combustion in
domestic stoves gives lower CO2 emission than the normal coal briquette. The developed
biobriquette provides a simple, economical, and efficient way for coal utilization and pollutant
control in some developing countries.
A novel agitation method using ozone was applied to removing BOD 5 , COD Mn , color, and NH 4 -N in organic waste water filled in a cylindrical vessel. The organic waste water was agitated by injecting the same organic waste water into the bath through a centered bottom nozzle. Its flow rate was adjusted to form a jet above the nozzle. A pump was used for draining the organic waster water through four nozzles settled on the bottom of the vessel and circulating it until the aforementioned four quantities were sufficiently decreased. The swirl motion of the jet appeared under certain injection conditions. The bath was strongly agitated in the presence of the swirl motion. An ozone and air mixture therefore was supplied into the nozzle and then introduced into the bath with the jet. The rate constants of BOD 5 , COD Mn , color, and NH 4 -N were highly enhanced by this method compared to the conventional method using aeration of an ozone-air mixture supplied through a perforated plate.
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