| Summary: | 碩士 === 國立中興大學 === 環境工程學系 === 93 === Disunion on the distribution of air current and the low condition of moisture of filter materials are the control factors for practical biofilter. Therefore, the first stage of this study is to investigate the air current distribution at different EBRT (90, 60, 40, 25, and 15 seconds). The removal efficiencies of different EBRT are 100, 90, 83, 75, and 63% respectively. For a shorter EBRT, the place where air current passes through the filter material located close to the end of biofilter. Under a high wind blow condition, it accelerated the loss of moisture to make cracks on the lower layer. It also occurred about >20% difference of moisture content between the upper and lower layer.
The second stage is to improve the moisture condition of the filter materials by applying humidifier tubes instead of spreading water form top of filter materials. Using isotopic and intensive interval of humidifier tubes to improve the moisture condition could increase the condition efficiency of moisture. The uniform and stably moisture condition (87-88%) could still keep high removal efficiency greater than 90%.
As presented results, a novel way which uses humidifier tubes with isotopic and intensive interval on filter to improve humidity of biofilter materials is suggested for practical application. This amendatory model is a energy-effective and cost-effective alternative of biofilter system.
|
|---|
