Effects of water temperature on phosphate adsorption onto sediments in an agricultural drainage canal in a paddy-field district
Effects of water temperature on phosphate adsorption onto sediments in an agricultural drainage canal in a paddy-field district
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DOI：
10.1016/j.ecoleng.2013.09.053
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发表时间：
2013-12
影响因子：
3.8
通讯作者：
Sho Sugiyama;T. Hama
中科院分区：
文献类型：
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作者：
Sho Sugiyama;T. Hama
农业排水渠中磷的动态变化取决于下垫面沉积物的吸附特性。水温是影响沉积物对磷吸附的基本因素，研究了水温对稻田区农业排水渠沉积物对磷吸附的影响。在5 ° C、15 ° C、25 ° C和35 °C下进行了磷酸盐（PO 4-P）吸附动力学实验，以阐明沉积物对PO 4-P吸附量的时间变化以及水温对PO 4-P吸附速率的影响。我们发现，较高的水温提高了吸附速率和PO 4-P的平衡浓度。磷酸盐吸附等温线实验也进行了在15，25，32，和35 °C和三个等温线模型被用来表征吸附行为。沉积物对PO 4-P的吸附量随水温的升高而增加。然而，有一个很强的正相关性之间的零平衡P浓度估计使用线性模型和水温。这些结果表明，沉积物可能是一个更大的来源PO 4-P的上覆水与较低的PO 4-P浓度时，在排水渠的水温高。
The phosphorus (P) dynamics in an agricultural drainage canal are dependent on the adsorption characteristics of the underlying sediments. Water temperature is a basic factor affecting P adsorption on the sediments, and this study was aimed at understanding the effects of water temperature on P adsorption onto the sediments in an agricultural drainage canal in a paddy-field district. Phosphate (PO4-P) adsorption kinetics experiments were conducted at 5, 15, 25, and 35 °C to clarify temporal variations in the amount of PO4-P adsorption onto the sediments and the effect of water temperature on the PO4-P adsorption rate. We found that higher water temperatures enhanced the adsorption rate and the equilibrium concentration of PO4-P. Phosphate adsorption isotherm experiments were also conducted at 15, 25, 32, and 35 °C and three isotherm models were used to characterize adsorption behavior. The amount of PO4-P adsorbed onto the sediments increased with water temperature. However, there was a strong positive correlation between the zero-equilibrium P concentrations estimated using the linear model and the water temperature. These results suggest that sediments may be a greater source of PO4-P for the overlying water with the lower PO4-P concentrations when water temperatures in a drainage canal are high.