城市生活垃圾焚烧炉渣对可溶性磷的去除研究

城市生活垃圾焚烧炉渣(MSWA)富含Ca、Fe、Al等金属物质且具有一定的比表面积(7.24 m^2/g),对溶解性的磷具有良好的化学沉淀及吸附去除作用。实验研究表明,MSWA对磷的去除随水溶液pH值增加先呈递增而后有所下降,对5 mg/L的含磷溶液,当pH=8.01时,MSWA对磷的去除率可达93.95%,且溶液中SO 4^2-、NO3^-及Cl^-阴离子并未明显的影响MSWA对磷的去除。通过对MSWA去除水体中磷的过程研究发现,MSWA对磷的去除符合Langmuir曲线( R^2=0.994)、并遵循二级动力学方程(R^2=0.971),理论饱和去除量可达6.623mg/g。

Study on Removal of Soluble Phosphorus by Municipal Solid Waste Incineration Bottom Ash

Municipal solid waste incineration bottom ash (for short MSWA) is not only rich in calcium, ferrum and aluminum ions, but also has a relative large specific surface area of 7.24 m^2/g, which has a good chemical precipitation and adsorption and removal effect on dissolved phosphorus. It has been shown that, for a solution with phosphate of 5 mg/L, the phosphate removal by MSWA increases firstly as pH value increasing and then decreases, the optimal removal for phosphate can reach 93.95% as pH being of 8.01. Meanwhile, the coexisting anions, SO4^2-,NO3^- and Cl^-, have not any effects on phosphate removal even as their concentration increase high to 400 mg/L. By studying the phosphorus removal process of MSWA in water, it is found that the phosphorus removal by MSWA conforms to the Langmuir curve ( R^2=0.994) and follows the second-order kinetic equation ( R^2=0.971), and the theoretical saturated removal amount can reach 6.623 mg/g.