| Summary: | 碩士 === 逢甲大學 === 環境工程與科學所 === 96 === Due to the rapid increase on economic growth and individual income in Taiwan, restaurants are getting popular and expanded significantly in the recent years. However, the smoke emitted from those restaurants is frequently argued or complained by the residents living nearby. Although EPA in Taiwan has initiated air pollution laws to enforce the requirement of equipping hardware facilities for the abatement of smoke emission, pollution on smoke emission by those commercial kitchens or restaurants seems not to be well controlled. The objective of this research was focused on the design and operation of lab-scale treatment system to purify kitchen smoke, simulated by adding sweet potato flour into heating oil, using advanced oxidation technologies.
According to our experimental results, it is found that the change in gas-liquid flowrate ratios, 0.3 and 0.4 m3/L, could not affect the treatment efficiency obviously. The removal efficiencies of total hydrocarbon (THC) by water scrubbing process are 22.3 % and 19.9%, respectively. The addition of using goethite catalyst with water scrubbing would improve the removal of THC up to 41.8% and 41%. Since the detention time in the catalyst bed is short, the treatment efficiency for THC would raise up to 6.6% only using hydrogen peroxide and ozone. In addition, organic matters in the circulation water can be properly oxidized by hydroxyl radicals produced by AOPs. The optimal efficiency for TOC removal is 71.8% by adding hydrogen peroxide and ozone. Based on this advantage, the life period of circulation water can be prolonged. In the meantime, oil in the circulation water could be also oxidized by hydroxyl radicals generated. The treatment efficiency on destroying oil in water using different AOPs processes would be more than 90%.
Surface characteristics of goethite were probed using different analytical instruments. XRD shows that many sorts of ferric oxide crystal were successfully grown. Although SEM photo indicates part of goethite surface has been wrapped by the oil and grease originated from the smoke stream using scrubbing process, the addition of hydrogen peroxide or ozone could oxidize them on the goethite. In addition, the surface area analyzed by BET was found to be enlarged from 2.5 to 8.9 m2/g after using oxidants, implying the complex reactions to be held on the catalyst surface.
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