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河流中泥沙运动对于磷的分布有着重要影响。针对粉粒粘粒混合物(≤0.038mm)、粉粒(0.038~0.075 mm)、极细沙(0.075~0.15 mm)、细沙(0.15~0.25 mm)四种泥沙粒径等级,运用循环流明渠模型,研究泥沙粒径变化对磷吸附过程的影响。试验结果显示,四种不同粒径泥沙均在3 h内完成吸附平衡,吸附平衡时单位质量泥沙饱和吸附量分别是:细沙为0.1 mg/g、极细沙为0.05 mg/g、粉粒为0.09 mg/g、粉粒粘粒混合物为0.13 mg/g,粉粒粘粒混合物的吸附速率最快,其最大吸附速率达到0.6 mg/(g·h)。除细沙外,其他三种粒径呈现粒级越小则吸附能力越强的规律。细沙由于内部孔隙较大,存在孔隙填充吸附,吸附特性与粉粒类似。
Sediment movement in rivers has an important influence on the distribution of phosphorus. Aiming at the grain size of four kinds of silt, such as silt and clay mixture (≤ 0.038mm), silt (0.038 ~ 0.075 mm), very fine sand (0.075 ~ 0.15 mm) and fine sand (0.15 ~ 0.25 mm) Open channel model to study the impact of changes in sediment particle size on phosphorus adsorption process. The experimental results show that the adsorption equilibrium of the four sediments with different particle sizes is completed within 3 h. The saturated sediment adsorption capacity per unit mass at adsorption equilibrium is 0.1 mg / g for fine sand, 0.05 mg / g for fine sand, The maximum adsorption rate was 0.6 mg / (g · h) with the maximum adsorption rate of 0.09 mg / g for the granule and 0.13 mg / g for the granulated clay. In addition to fine sand, the other three particle size showed a smaller particle size, the stronger the adsorption capacity of the law. Fine sand due to the larger internal pores, there is pore-filled adsorption, adsorption characteristics and particles similar.