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Ebie, Kunio,Jang, Il-Hun 대한상하수도학회 2004 상하수도학회지 Vol.18 No.2
Polysilicato-iron coagulant (PSI) is receiving attention in Japan as a substitute for aluminum-based coagulants. In the first part of this article, coagulation, sedimentation and filtration experiments were carried out using kaolin clay particles as the turbidizing material and four types of PSI with various molar ratios of polysilicic acid to ferric chloride (Si/Fe ratio). Results demonstrate that use of a PSI with a high Si/Fe ratio can cause a more dramatic decrease in treated water turbidity but a higher suction time ratio (STR) than when PACl is used. However, optimization by increasing the rapid agitation strength GR is found to greatly improve the STR. In addition, the series of filtration experiments verified that optimization of GR is greatly effective in controlling rapid increases in filter head loss, and also formation of a thin aging layer in the upper part of the filter bed by slow-start filtration is effective in improving filtered water turbidity over the entire filtration process. The second part of this article describes two innovative filtration techniques to increase the particle separation efficiency; (1) coagulant-coated filter medium by enhancing the electrical potential of the surface of the filter medium, and (2) coagulant dosing in influent by controlling the electrical potential of particles entering the filter layer. From the results of the various filtration experiments using a pilot plant, these two techniques were found to be very effective to reduce the effluent water turbidity from the start to the end of a filter run. Moreover, in the filtration experiments using these two methods simultaneously, higher removal efficiency of approximately 3-log (99.7%) was realized, resulting that the finished water turbidity was accordingly reduced to 0.004㎎/L.
EFFECTIVENESS OF WATER SURFACE WASHING IN CLEANSING RAPID SAND FILTERS
EBIE, Kunio,LI, Fusheng 嶺南大學校 環境問題硏究所 1996 環境硏究 Vol.16 No.1
Experiments in water surface washing with and without water backwashing were conducted to investigate the mechanism and the effect of water surface washing in the cleansing of rapid sand filters. The results showed that the effect of water surface washing alone was limited only to the upper portion of the filter bed with a depth of less than 8 cm from the sand surface. However, through the combined use with water backwashing, its influence could reach the lower portion of the filter bed, leading to a much higher discharge rate of the turbid matter deposited throughout the whole filter. Moreover, Introducing the surface washing during the middle period, compared to carrying it out during the initial or the final period of water backwashing, proved to be much more effective.
Case study of reduction of overflow risk in landfill leachate by constructed wetlands in Thailand
( Yuka Ogata ),( Toinonori Ishigaki ),( Yosliitaka Ebie ),( Noppharit Suttliasil ),( Chayanid Witthayaphirom ),( Chart Chiemchaisri ),( Masato Yainada ) 한국폐기물자원순환학회(구 한국폐기물학회) 2017 한국폐기물자원순환학회 심포지움 Vol.2017 No.1