Preliminary Nitrogen Removal Rates in Close-to-Nature Constructed Stream Water Treatment Wetland

Yang, Hong-Mo

doi:10.5338/KJEA.2002.21.4.269

Title & Authors

Preliminary Nitrogen Removal Rates in Close-to-Nature Constructed Stream Water Treatment Wetland
Yang, Hong-Mo;

Abstract

A 0.19 hectare stream water purification demonstration wetland was constructed and planted with cattails from April 2001 to May 2001. Some portions of its bottom surfaces adjacent to levees have a variety of slope of 1:4 ${$\sim$}$ 1:15 and two small open water areas were installed in the wetland. These make its shape closer to a natural wetlant Nitrogen removal was a major objective of the wetlant Waters of Sinyang Stream flowing into Kohung Esturiane Lake located southern coastal region of Korean Peninsula were pumped and funneled into it. Volumes and water quality of inflow and outflow were analyzed from July 2001 through December 2001. Average inflow and outflow were 120 ${$m^3/d$}$ and 112 ${$m^3/d$}$ , respectively. Hydraulic retention time was about 3.1 days. Average nitrate and total nitrogen removal rate for the early stage of the wetlands were 85.8 ${$mg/m^2/day$}$ , 171.4 ${$mg/m^2/day$}$ respectively. Full establishment of cattails within a few years can develope litter-soil substrates and supply available carbon sources beneficial to the denitrification of nitrate. These can lead to increases of the nitrate retention rate. Short circuiting and dead zone areas which might be occurred due to the close-to-nature layout of the wetland were not observed during the monitoring period.

Keywords

Nitrogen removal;wetland;water quality;

Language

Korean

Cited by

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