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采用高温焙烧法制备了一种以给水厂终端铝盐混凝污泥为原料的新型吸附剂.通过静态吸附实验探讨其对氨氮的吸附性能,实验中主要考察了不同初始p H、接触时间和温度等因素对氨氮吸附效果的影响,同时分析了吸附剂对氨氮的吸附等温线,动力学和热力学特性.结果表明,在中性条件下吸附剂对氨氮有较好的去除效果;吸附过程在6 h基本达到平衡,吸附过程符合准二级动力学模型,Langmuir吸附模型可较好地拟合吸附剂对氨氮的吸附;热力学参数表明陶粒吸附剂对NH_4~+-N的吸附过程是自发的、吸热反应(ΔG~θ<0、ΔH~θ>0),且由平均吸附能得到该吸附属于物理吸附.因此,混凝污泥处理氨氮废水具有良好的应用前景.
A new type of adsorbent was prepared by high temperature roasting method using the terminal aluminum salt coagulation sludge from feedwater plant as raw material.The static adsorption experiments were carried out to study the adsorption properties of ammonia nitrogen.The experiments mainly focused on the different initial p H, contact time and Temperature and other factors on the adsorption of ammonia nitrogen, and also analyzed the adsorption isotherms, kinetics and thermodynamic properties of the adsorbent on ammonia nitrogen.The results show that the adsorbent has a good removal of ammonia nitrogen under neutral conditions; the adsorption process in 6 h basically reached the equilibrium, the adsorption process accorded with the quasi-second-order kinetic model, and the Langmuir adsorption model could well fit the adsorption of ammonia nitrogen to the adsorbent. The thermodynamic parameters indicated that the adsorption process of NH 4 + -N by the adsorbent was spontaneous (ΔG ~ θ <0, ΔH ~ θ> 0), and the adsorption by the average adsorption energy belongs to the physical adsorption. Therefore, the coagulation sludge treatment of ammonia nitrogen wastewater has a good application prospect.