Characterization of particles from road runoff is very important for the selection of Best Management Practice (BMP) in the stormwater management. In this study, runoff samples during two rainfall events at four sites in Gyunggio-Do were collected and Particle Size Distributions (PSD) in the size range of 2-880 µm were determined. Then number and mass fraction of each size range was obtained from a total of 89 samples. Also, rainfall amount, flow rate, and other pollutants in samples were analyzed. Particles with less than 5 µm accounted for more than 80% of number fraction while their mass fraction was about 12%. Particles larger than 50 µm contributed more than 40% of mass fraction. Partial Event Mean Concentration (PEMC) of particle showed inverse relationship with accumulated rainfall and sharply decreased at the early stage of rainfall, implying that the first flush is major contribution to particle runoff. Other pollution parameters such as turbidity, TSS, BOD, TN, and TP also have similar temporal runoff trend with the PEMC. Particle settling velocities of runoff particles were obtained by column tests and their values were compared with theoretical velocities. Based on the settling velocity distribution, removal efficiency of particles from runoff by sedimentation was evaluated.
The objective of this study was to evaluate the characteristic of adsorption by using a meso-porous adsorbent (MPA), and investigate the removal efficiency of geosmin which taste and odor causing compounds in drinking water supplies through batch test. The results for the adsorption isotherm was analyzed by using the Langmuir equation and Freundlich equation, generally being applied. And the study showed that the both Langmuir and Freundlich equation explains the results better. Both of pseudo-firstorder model and pseudo-second-order model were respectively applied for evaluation of kinetic sorption property of geosmin onto MPA. The adsorption experiment results using MPA showed that maximum adsorption capacity of MPA was lower 7 times than that of GAC, and adsorption rate of MPA was faster 11 times than that of GAC, on the basis of pseudo-first-order model. Therefore, it was determined that MPA was effectively able to remove geosmin in drinking water supplies in short EBCT condition, but regeneration cycle in MAP process was shorter than that in conventional process.
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