We report the adsorption of phosphate and discuss the mechanisms of phosphate removal from aqueous solution by burst furnace slag (BFS) and steel furnace slag (SFS). The results show that the adsorption of phosphate o...We report the adsorption of phosphate and discuss the mechanisms of phosphate removal from aqueous solution by burst furnace slag (BFS) and steel furnace slag (SFS). The results show that the adsorption of phosphate on the slag was rapid and the majority of adsorption was completed in 5~10 min. The adsorption capacity of phosphate by the slag was reduced dramatically by acid treatment. The relative contribution of adsorption to the total removal of phosphate was 26%~28%. Phosphate adsorption on BFS and SFS follows the Freundlich isotherm, with the related constants of k 6.372 and 1/n 1.739 for BFS, and of k 1.705 and 1/n 1.718 for SFS. The pH and Ca2+ concentration were decreased with the addition of phosphate, suggesting the formation of calcium phosphate precipitation. At pH 2.93 and 6.93, phosphate was desorbed by about 36%~43% and 9%~11%, respectively. These results indicate that the P adsorption on the slag is not completely reversible and that the bond between the slag particles and adsorbed phosphate is strong. The X-ray diffraction (XRD) patterns of BFS and SFS before and after phosphate adsorption verify the formation of phosphate salts (CaHPO4·2H2O) after adsorption process. We conclude that the removal of phosphate by BFS and SFS is related to the formation of phosphate calcium precipitation and the adsorption on hydroxylated oxides. The results show that BFS and SFS removed phosphate nearly 100%, indicating they are promising adsorbents for the phosphate removal in wastewater treatment and pollution control.展开更多
通过对传统从阴影到形状(Shape from shading,SFS)问题和支持矢量机(Supporting vector machine,SVM)的研究,提出一种基于SVM由从明暗恢复形状方法,详细分析了这一方法的理论依据和可行性,探讨了SVM输入参数的确定、核函数的选择与构造...通过对传统从阴影到形状(Shape from shading,SFS)问题和支持矢量机(Supporting vector machine,SVM)的研究,提出一种基于SVM由从明暗恢复形状方法,详细分析了这一方法的理论依据和可行性,探讨了SVM输入参数的确定、核函数的选择与构造等关键问题。试验表明,与传统SFS方法相比,提出的方法能较准确地直接获取物体的高度值,且受环境因素影响小,无需作过多的成像条件假设。最后探讨了这一方法的改进方向。展开更多
基金Project supported by the Foundation for the Author of NationalExcellent Doctoral Dissertation of China (No. 200149)the NaturalScience Foundation of Zhejiang Province (No. R305078), China
文摘We report the adsorption of phosphate and discuss the mechanisms of phosphate removal from aqueous solution by burst furnace slag (BFS) and steel furnace slag (SFS). The results show that the adsorption of phosphate on the slag was rapid and the majority of adsorption was completed in 5~10 min. The adsorption capacity of phosphate by the slag was reduced dramatically by acid treatment. The relative contribution of adsorption to the total removal of phosphate was 26%~28%. Phosphate adsorption on BFS and SFS follows the Freundlich isotherm, with the related constants of k 6.372 and 1/n 1.739 for BFS, and of k 1.705 and 1/n 1.718 for SFS. The pH and Ca2+ concentration were decreased with the addition of phosphate, suggesting the formation of calcium phosphate precipitation. At pH 2.93 and 6.93, phosphate was desorbed by about 36%~43% and 9%~11%, respectively. These results indicate that the P adsorption on the slag is not completely reversible and that the bond between the slag particles and adsorbed phosphate is strong. The X-ray diffraction (XRD) patterns of BFS and SFS before and after phosphate adsorption verify the formation of phosphate salts (CaHPO4·2H2O) after adsorption process. We conclude that the removal of phosphate by BFS and SFS is related to the formation of phosphate calcium precipitation and the adsorption on hydroxylated oxides. The results show that BFS and SFS removed phosphate nearly 100%, indicating they are promising adsorbents for the phosphate removal in wastewater treatment and pollution control.
文摘通过对传统从阴影到形状(Shape from shading,SFS)问题和支持矢量机(Supporting vector machine,SVM)的研究,提出一种基于SVM由从明暗恢复形状方法,详细分析了这一方法的理论依据和可行性,探讨了SVM输入参数的确定、核函数的选择与构造等关键问题。试验表明,与传统SFS方法相比,提出的方法能较准确地直接获取物体的高度值,且受环境因素影响小,无需作过多的成像条件假设。最后探讨了这一方法的改进方向。
