粉煤灰及其制备沸石对高浓度氨氮的去除比较

发布时间：2018-03-15 07:09

本文选题：粉煤灰沸石　切入点：高浓度氨氮废水　出处：《化工环保》2015年06期 　论文类型：期刊论文

【摘要】：以粉煤灰为原料,采用改进的水热合成法制备了粉煤灰沸石,并将粉煤灰和粉煤灰沸石用于高浓度氨氮的吸附去除。实验结果表明:在粉煤灰和粉煤灰沸石的投加量分别为0.10 g/m L和0.04 g/m L、反应体系p H为5~7、初始氨氮质量浓度为500 mg/L的条件下,分别吸附660 min和60 min,粉煤灰和粉煤灰沸石对氨氮的去除率分别约为20.1%和50.7%左右,粉煤灰沸石对高浓度氨氮的去除效果明显优于粉煤灰;粉煤灰和粉煤灰沸石对氨氮的吸附动力学行为符合准二级动力学方程;Langmuir和Freundlich等温吸附模型能较好地描述粉煤灰对氨氮的等温吸附过程,而粉煤灰沸石对氨氮的等温吸附过程则更适宜用线性模型和Freundlich模型描述。
[Abstract]:Fly ash zeolites were prepared by an improved hydrothermal method with fly ash as raw material. Fly ash and fly ash zeolites were applied to the adsorption and removal of high concentration ammonia nitrogen. The experimental results showed that the dosage of fly ash and fly ash zeolites was 0.10 g / mL and 0.04 g / mL, respectively, the reaction system pH was 5g / mL, and the initial ammonia nitrogen concentration was high. When the degree is 500 mg/L, The removal rates of ammonia nitrogen by fly ash and fly ash zeolites were about 20.1% and 50.7% respectively when adsorbed for 660 min and 60 minutes respectively. The removal efficiency of high concentration ammonia nitrogen by fly ash zeolite was obviously better than that of fly ash. The adsorption kinetics of ammonia nitrogen by fly ash and fly ash zeolites is in accordance with the quasi-second-order kinetic equation: Langmuir and Freundlich isothermal adsorption models can describe the isothermal adsorption process of ammonia nitrogen by fly ash. The isothermal adsorption process of fly ash zeolite for ammonia nitrogen is more suitable to be described by linear model and Freundlich model.
【作者单位】：辽宁工程技术大学环境科学与工程学院;
【基金】：辽宁工程技术大学生产技术问题基金项目(14-T-022) 辽宁省大学生创新创业训练计划项目(201510147051)
【分类号】：X773;X703

【参考文献】