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有機物供給による土壌浸透水からの窒素除去技術の基礎的検討

土壤渗滤水供给有机质脱氮技术基础研究

基本信息

批准号：
07780474
负责人：
川西琢也
金额：
$ 0.64万
依托单位：
Kanazawa University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Encouragement of Young Scientists (A)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至无数据
项目状态：
已结题

项目摘要

本研究では土壌鉛直2次元断面中の流れを模擬できる実験装置を作成し,上端から模擬排水を供給,土壌層中へ散水管より有機物溶液を供給し,有機物溶液供給方法(散水管の間隔,溶液量,有機物濃度)が排水の窒素除去率に及ぼす影響について検討を加えた。その結果,土壌表面からの酸素拡散が脱窒を阻害すること,単位面積当の有機物溶液供給量が同じならば散水管間隔が短いほど効率が良いこと等が明らかとなった。本実験では透水性の高い土壌を用いたが,これは窒素除去上は良い選択ではないことが明らかとなった。また,数理モデルを作成し,土壌中での排水(浸透水)と有機物溶液との混合を解析することにより,脱窒効率をある程度予測できることが明らかとなった。本研究は水分不飽和の状態での検討であったが,今後実験においては飽和状態での溶液混合状態と脱窒率との関係の検討が,数理モデルでは流れの不均質性の影響の検討が課題となろう。

In this study, the simulation equipment for flow in vertical 2-D section of soil layer was constructed, and the simulated drainage was supplied at the upper end. The organic solution was supplied from the diffusion pipe in the soil layer. The organic solution supply method (the interval of the diffusion pipe, the amount of solution, and the concentration of organic matter), the removal rate of drainage elements, and the influence of drainage were discussed. As a result, the surface of the soil is divided into two parts, namely, the surface area is divided into three parts, the surface area is divided into three parts, and the surface area is divided into three parts. The water permeability of the soil is high, and the water permeability of the soil is high. In addition, the mathematical model is used to analyze the mixture of drainage (saturated water) and organic solution in the soil, and the prediction of the degree of degassing is also used. In this study, we will discuss the relationship between the mixed state of the solution and the degassing rate in the unsaturated state of water. In the future, we will discuss the relationship between the mixed state of the solution and the degassing rate in the saturated state, and the influence of the heterogeneity of the water flow in the mathematical and physical environment.