| Abstract |
| In this study, a pilot plant of Back-washing Sponge Media, Vegetation Filtration, and Multi-Layer Filtration process was installed to treatent and re-use road runoff during rainfall. In order to evaluate the efficiency of the unit process of the Pilot Plant, the experiment was conducted by changing the concentration of the artificial rainfall. Experiments were carried out by artificial rainfall runoff considering the rainfall runoff around the Seoul area roads. In addition, the process recovery was evaluated by estimating the recovery rate through the backwash to control not only the water quality, but also the clogging due to high concentration of particulate matter inflow and long-term operation. CODcr and TP in the raw water of organic matter and nutrients of high concentration were 41%, 10%, and 40% in the pretreated sponge media pretreatment, and 94% and 44% in the vegetation filtration process and 98% in the multi-layer filtration process, respectively. Experiments on only multi-layered process showed that heavy metals tend to increase somewhat after decreasing processing concentration. The treatment efficiencies of Cd, Cr and Pb were 25~27% and the efficiency of Zn was 96%. Finally, through backwashing, it was confirmed that the amount of permeate recovered up to 78-85% through backwashing as a result of the experiment with high concentration of particulate matter and pollutants in order to confirm the permeation amount and recovery amount. |
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| Key Words |
| Multi-layer filtration, Rain Water, Road runoff, Sponge media, Vegetation filtration |
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