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Removal of Organic Matter and Nitrogen from River Water in a Model System of Floodplain Filtration  

Ha, Hyun-Soo (Department of Environmental Engineering, Yeungnam University)
Kim, Sang-Tae (Department of Environmental Engineering, Yeungnam University)
Kim, Seung-Hyun (Department of Environmental Engineering, Yeungnam University)
Jeong, Byeong-Ryong (Department of Agronomy, Taegu University)
Lee, Young-Deuk (Department of Agricultural Chemistry, Taegu University)
Eum, Jin-Sup (Department of Agricultural Chemistry, Taegu University)
Ji, Seung-Hwan (Department of Agronomy, Taegu University)
Chung, Jong-Bae (Department of Agricultural Chemistry, Taegu University)
Publication Information
Applied Biological Chemistry / v.45, no.2, 2002 , pp. 84-91 More about this Journal
Abstract
If contaminated river water is sprayed over the floodplain, organic matter and nitrogen would be removed by microbial processes in the rhizosphere of vegetation during the filtration through soil. In this study we tested the organic matter and nitrogen removal from contaminated river water by the floodplain filtration. Model system of floodplain was constructed using a PVC pipe (15 cm i.d. ${\times}$ 150 cm L) which was packed with a loamy sand soil collected from a floodplain in Nakdong river. The model system was instrumented with soil solution samplers and gas samplers. A river water collected from Omogcheon in Kyongsan was sprayed from top of the model system at three different rates. The concentration of organic matter, DO, $NO_3^-$, $NO_2^-$, $NH_4^+$, $N_2$ and $N_2O$, and redox potential were measured as a function of soil depth for 24 days after the system reached a steady state. When river water was sprayed at the rates of 40.8 and 68.0 $l/m^2/day$, a significant reductive condition for denitrification was developed at below 5-cm depth of the soil. When the water reached at 90-cm depth of the soil, COD and concentration of inorganic nitrogen were lowered, on an average, from 18.7 to 5 mg/l and from 2.7 to 0.4 mg/l, respectively. $N_2$ comprised most of the N gas evolved from denitrification and $N_2O$ concentrations emitted at the surface of soil were less than 1 {\mu}l/l. The effective removal of organic matter and nitrogen by the filtration in the model system of floodplain demonstrates that the native floodplains, which include rhizosphere of vegetation at the top soil, could be more effective in the treatment of contaminated river waters and other industrial waste waters containing high concentration of organic matter and nitrogen.
Keywords
denitrification; water treatment; floodplain filtration; COD; $N_2$; $N_2O$; $NO_3$;
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