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정태학,최재완 대한상하수도학회 1989 상하수도학회지 Vol.3 No.1
Experiments on carbon adsorption and desorption were conducted to investigate the effects of initial conditions on the adsorption capacity determination. A dye, Crystal Violet, was chosen as an adsorbate and the bottle point method was utilized. When the initial concentration of the adsorbate was increased, higher adsorption capacity was obserbed. When the initial solid phase concentration was high, higher adsorption capacity was also recorded due primarily to incomplete desorption. Such a hysteresis phenomenon could be explained by capillary condensation and swelling theory. Current mathematical models based on equilibrium assumption was not adequate for describing the desorption process. It is believed that some solutes adsorbed on the site are not readily desorbed. Complete desorption may require much longer contact time or may not be possible because of irreversible nature of adsorption and desorption. Complete reversibility of equilibium assumption may not always be applicable for the adsorption and desorption processes.
정태학,이재복 대한상하수도학회 1991 상하수도학회지 Vol.5 No.1
Dewatering efficiency of highly compressible biological solids and internal characteristics of filter cakes were investigated by experimental observations and model simulations. Tiller's revised models were used to analyse cake filtration characteristics under the constant pressure condition. Waste activated sludge was examined and compared with talc and Hong Kong pink kaolin sludge, which are relatively low compressible. The model simulations showed a sharp drop of the porosity close to the cake-medium interface for a highly compressible material such as waste activated sludge. This implied that a large part of the resistance was concentrated in a compact layer next to the supporting medium, and increasing the filtration pressure was not a reliable scheme to improve dewatering efficiency.