改性钢渣的制备及其吸附除磷性能
Preparation of modified steel slag and its phosphate removal performance

研究了改性钢渣吸附除磷影响因素、等温吸附线特征和吸附动力学，并对生物处理后的出水进行吸附除磷研究。结果表明：在初始磷浓度10 mg/L，投加量10 g/L、pH为7时，改性钢渣吸附后总磷浓度为0.687 mg/L，去除率达93%；改性钢渣对磷的吸附符合Langmuir模型，理论饱和吸附量是1.977 mg/g，吸附动力学符合准二级动力学模型（R2>0.99）；实际生活污水的吸附除磷中，投加量为50 g/L，反应2 h后出水总磷浓度达到《城镇污水处理厂污染物排放标准》（GB 18918-2002）一级B标的排放要求。
The influence factors, adsorption isotherm and kinetics of phosphate removal by modified steel slag were investigated in this study. In addition, the modified steel slag was applied to the phosphate removal of effluent after biological treatment. Result showed that the concentration of total phosphorus decreased to 0.678 mg/L and the removal rate reached 93% after adsorption by modified steel slag at 10 mg/L of initial phosphorus concentration, 10 g/L dosage of modified steel slag and pH 7;The adsorption of phosphorus by modified steel slag was in accordance with the Langmuir isotherm model and the theoretical saturated capacity was 1.98 mg/g. The adsorption process could be well described by the pseudo second-order kinetics(R2>0.99). Furthermore, in the treatment of domestic wastewater, the total phosphorus concentrations of effluent reached the first B grade discharge standard of GB18918-2002 after treated by modified steel slag for 2 hours with a dosage of 50 g/L.