Estimation of Nutrient Elution and Removal on Sediment Surface of Clayey Canal Based on Hydraulic Model Experiments
ISSN | 00213551 |
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書誌レコードID(総合目録DB) | AA0068709X |
A clayey canal tends to be selected over a concrete-lined canal to achieve water quality conservation in a land improvement project. Therefore, it is important to analyze quantitatively the interaction of nutrients on the sediment in a clayey canal. In this paper, the COD, nitrogen and phosphorus fluxes as well as elution and removal rates across/on the sediment surface were estimated based on hydraulic model experiments. The experiments were carried out for water under aerobic conditions at 30-32℃ (CASE 1) and 6-9℃ (CASE 2). In CASE 1, the net COD elution rate and the net phosphorus elution rate were 8.2 mg•m-2•day-1 and 11.5 mg•m-2•day-1, respectively. Nitrogen was removed by nitrification on the sediment surface so that the net removal rate which is composed of the denitrification rate, the settling rate and the elution rate was 15.1 mg•m-2•day-1. The rate constant in which the nitrogen removal is expressed as a first-order kinetic was 0.010 m/day. In CASE 2, the net COD elution rate and the net phosphorus elution rate were 9.9 mg•m-2•day-1 and 5.4 mg•m-2•day-1, respectively. The net nitrogen removal rate and its rate constant were 9.0 mg•m-2•day-1 and 0.0023 m/day, respectively. The rates of elution and removal increased remarkably with the temperature.
刊行年月日 | |
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作成者 | SHIRATANI Eisaku SHIOFUKU Teruo KUBOTA Tomijiro YOSHINAGA Ikuo HASEBE Hitoshi |
著者キーワード |
water quality denitrification creek chemical oxygen demand |
公開者 | Japan International Research Center for Agricultural Sciences |
オンライン掲載日 | |
国立情報学研究所メタデータ主題語彙集(資源タイプ) | Journal Article |
巻 | 36 |
号 | 4 |
開始ページ | 195 |
終了ページ | 200 |
DOI | 10.6090/jarq.36.195 |
権利 | Japan International Research Center for Agricultural Sciences |
言語 | eng |