| Abstract |
| Through a kinetic analysis of denitrification reaction of upflow fluidized activated carbon bed, the objectives of this research were to investigate the characteristics of substrate adsorption and desorption, bioregeneration for granular activated carbon (GAC). biological activated carbon(BAC), and Artificial Light Aggregate(ALA). The experiments using artificial wastewater were carried out with continuous and semi-continuous flow experiment. A semi-continuous experiment was began from the steady state of BAC bed. The C/N ratio was controlled at 7.06 in both continuous experiment and semi-continuous experiment. Based on the results of this research, adsorption capacity and rate of BAC bed compared to that of GAC were 73.7 to 71.6% and 30.4%, respectively, and the adsorption rate coefficient(k) of activated carbon were given 9.1 x 10 exp(-3)L/g.hr for BAC and 59.2× 10 exp(-3)L/g.hr for GAC. Adsorption isotherms were given q_AC= 51.7C^0.213 for BAC and q_ALA=2.35C^0.051 for ALA. The amount of bioregeneration for BAC was higher than that of desorption calculated from adsorption isotherm. In the semi-continuous experiment, the average denitrification efficiency achieved 78% on the BAC at influent C/N ratios of 0 to 508. Bioregeneration due to denitrification was given a first-order reaction with respect to adsorbed organic carbon quantity, and its rate was characterized as K_G= K_Gm·R/ K_R+R by the Michealis- Menten type equation as to the loading rate of nitrate nitrogen. |
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| Key Words |
| Denitrification reaction, upflow fluidized activated carbon bed, GAC, BAC, ALA, adsorption capacity, adsorption isotherm, bioregeneration |
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