Natural Water Self-purification by Plastic Media

• Main Authors: Kan, Lien-Ching, 甘連慶
• Other Authors: Wen Ching-Kawn
• Format: Others
• Language: zh-TW
• Published: 1998
• Online Access: http://ndltd.ncl.edu.tw/handle/80855154711815123406

碩士 === 國立成功大學 === 環境工程學系 === 86 === Sewage flowing in natural water way is purified by organisms in water and muddy bed, specially in the muddy bed. The BOD removal of sheet flow sewage is dominated by the area of the bottom bed. In order to increase the area of biofilm, this paper dredged two 25-meter channels and put plastic media in them. The sewage in the natural water way was pumped into the channels and aerated. Experiments were carried out to study the effect of dissolved oxygen (DO), hydraulic retention time (HRT) and volumetric loading. Result indicated that the removal of pollutant was dominated by the hydraulic retention time (HRT), the volumetric loading and the concentration of influent. One relationship was derived:In the media channel (horrizental)The percent of BOD removal=-31.22+2.02HRT+1.54Cin+213.91loadingIn the media channel (vertical)The percent of BOD removal=34.73+0.06Cin-339.98 loadingIn the blank channelThe percent of BOD removal=-6.54+1.89 Cin+29.44loadingKeyword：Self-purification, Biofilm, Hydraulic Retention Time (HRT), Volumetric Loading