| Todays, The coastal environmental contamination caused by the waste water discharged from inland aquaculture have surfaced as a important issue and the biofilm filtration system was used to effectively, economically and steadily treatment. To selection of optimal media, each type of media comparatively analyze physical characteristics and filtration treatment efficiency. The results of experiment were as follows; 1. The physical characteristics of the porous plastic media used in this research represented specific gravity, 0.59; roundness, 0.73; porosity, 75.0; permeability coefficient, 588㎝/min; and specific surface area, 9.92×103㎥/㎡; and that this media was the most suitable to the biofilm filtration process, as compared to sand or scoria media. 2. It has been verified through filtration characteristic comparison tests that plastic media offer the quickest filtration tunes, and best SS and COD removal characteristics. 3. At a filtration rate not exceeding 400m/day, major pollutants such as SS and COD were effectively and steadily removed and, in the case of limiting headloss being 0.6m, continuous filtration time was approximately 28 hours. 4. The experiments showed no significant difference resulting from filtration rate variation with respect to the amounts of total SS and COD removed per unit filtration area during thu effective filtration at different filtration rate. The total average amounts of SS and COD removed per unit volume were calculated at 8.81㎏SS/㎥ and 2.06㎏COD/㎥, respectively. |
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