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Removal of Organic Matter and Nitrogen in a Model System of Riverbed Filtration  

Ahn, Kyu-Hong (Water Environment and Remediation Center, KIST(Korea Institute of Science and Technology))
Sohn, Dong-Bin (Department of Environmental Engineering, Yeungnam University)
Kim, Seung-Hyun (Department of Environmental Engineering, Yeungnam University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.27, no.5, 2005 , pp. 525-534 More about this Journal
Abstract
A column experiment was performed to investigate the influence of the sludge cake development on the riverbed and the hydraulic gradient imposed by the drawdown at the well on the filtrate quality in order to offer a guideline in the design and operation of the riverbed filtration. Results show that the sludge cake on the riverbed plays an important role in the removal of the organic matter. Under the conditions of this study the COD removal rate increased from 17% to 50% along with the sludge cake development, which was equivalent to the BCOD removal of 22% and 67%, respectively. The active removal of the organic matter took place in the sludge cake and the upper 40 cm of the riverbed. As the flow rate increased owing to the increase in the head difference imposed on the column, the slope of the COD profile near the column inlet decreased, however, the profiles converged in about 40 cm from the inlet. In 10 days of sludge cake formation the dissolved oxygen was depleted at the depth of 70 cm, which suggests the denitrification can take place beyond the depth. This depth was further reduced to $20{\sim}40\; cm$ as the sludge cake developed. From this study the removal of organic matter can be expected through the riverbed filtration even with the depth of as shallow as 3 m, which is frequently met in Korea, while the removal of nitrogen through denitrification is not expected to be active under the condition.
Keywords
Riverbed Filtration; Column Experiment; Flow Rate; Filtrate Quality; Sludge Cake;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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