斜发沸石深度处理氨氮废水及其再生

Advanced Treatment of Ammonia-Nitrogen Wastewater by Clinoptilolite and Its Regeneration

分别用粉末状沸石和颗粒状沸石在静态和动态条件下吸附处理废水中的氨氮,进行沸石吸附氨氮的吸附等温线、吸附动力学、动态吸附及再生实验。结果表明：Freundlich方程和Langmuir方程均能描述沸石对氨氮的吸附行为,但Langmuir方程的拟合相关性优于Freundlich方程;用假二级方程能很好地拟合沸石吸附氨氮的吸附动力学实验数据;在其他实验条件相同的条件下,粒径为0.8-1 mm的沸石去除氨氮效果明显优于粒径为3~5 mm和1~2 mm的沸石,同一粒径的沸石在废水流速为4 m/h时吸附效果最好;当沸石质量为35 g时,以0.9 mol/L NaCl做再生液,再生时间5 h,再生液用量为0.7 L的条件下,沸石经5次再生后仍具有较好的吸附效果。

Powdered and granulated clinoptilolites were used to adsorb ammonia and nitrogen from wastewater in the static and dy namic conditions. The experiments about adsorption isotherm, adsorption kinetics, dynamic adsorption and chemical regeneration of cli noptilolite were studied. The results showed that Freundlich equation and Langmuir equation can describe the elinoptilolite adsorption behavior of ammonianitrogen, but the fitting results of Langmuir equation is better than that of Freundlieh equation ; The false secondary equation is quite fit for expressing adsorption kinetics experiment data;The elinoptilolite adsorption efficiency of ammonianitrogen with particle size of 0.8 1 mm is much better than that of 3 - 5 mm and 1 2 mm in else same condition, and clinoptilolites of same parti cle size has the best adsorption effect in the wastewater flow rate of 4 m/h ; The clinoptilolite still has preferable regeneration effect ＂after five regeneration recycle with 0.9 mol/L NaC1 solution, regenerated 5 h and regenerated liquid dosage of 0.7 L when the quality of cli noptilolite is 35 g.