• 한국환경과학회지
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• 제24권1호
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• pp.73-79
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• 2015

The objective of this work was to treat complex mal-odor of food waste with micro-bubbles from enhanced wet scrubber system, where the pilot plant was operated. Micro bubbles from the enhanced reactor of venturi scrubber were successfully generated through the air atomizing process with high velocity more than 60 m/sec and played an important role in the removal of mal-odor. Mal-odor was effectively changed into the micro-bubble and treated with washing chemicals together. Through establishing two series connection of the reactors, 85.2 % removal efficiency of complex mal-odor was obtained in case of average 940 times of input air. 0.35 kg/hr of sulfuric acid, 0.188 kg/hr of sodium hydroxide and 0.043 kg/hr of hypochlorite were injected for chemical washing.

• 한국가시화정보학회지
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• 제22권3호
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• pp.117-123
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• 2024

This study aims to confirm the feasibility of separating heavy metals and chlorine from fly ash generated in power plants and incinerators, enabling its potential reuse. A closed-loop Venturi system was used as the cavitation generator, applying the Bernoulli principle. Cavitation occurs when local pressure drops below the vapor pressure, and the energy released during the collapse of cavitation bubbles effectively detaches contaminants bound to the surface of the fly ash. Preliminary experiments visualizing cavitation in water confirmed the cavitation occurrence zone. After washing two types of fly ash, component analysis revealed a reduction in chlorine ions by 76-86.1% and lead by 89.5%. In additional experiments using a different fly ash sample, reductions in lead (80.7%), copper (99.5%), and hexavalent chromium (at least 63.6%) were observed. While there may be some errors due to measurement limitations, these results demonstrate the efficiency of this system in cleaning contaminated fly ash.