超声与改性沸石强化处理高浓度氨氮废水

Enhanced Treatment of High-Concentration Ammonia-Nitrogen Wastewater by Processes of Ultrasonic and Modified Zeolite

在对人造沸石进行NaCl溶液浸泡改性处理的基础上,采用超声强化吸附氨氮的传质过程。通过氨氮吸附试验、表征分析和吸附等温线拟合,进一步考察了改性沸石在超声和非超声条件下对氨氮的吸附特性,叠加超声作用后,溶液中氨氮去除效果更显著。试验结果表明,浓度为0.8 mol/L的NaCl溶液对人造沸石改性效果最佳;当改性沸石投加量为50g/L、吸附时间为40 min、常温为25℃、pH呈中性、超声功率为240 W时,氨氮去除效果最好。Langmuir和Freundlich吸附等温曲线皆可较好描述改性沸石对氨氮的吸附过程。

Based on the modification of NaCl solution for artificial zeolite, mass transfer process of adsorption ammonia nitrogen was strengthened by ultrasonic. Adsorption characteristics of modified zeolite on the ammonia nitrogen were investigated under ultrasonic and non-ultrasonic conditions, by ammonia adsorption test, characterization analysis and adsorption isotherm fitting. The removal effect of ammonia nitrogen in solution was more significant with ultrasonic method. The experimental results showed that NaCl solution with a concentration of 0. 8 mol/L had the best effect on the modification of artificial zeolite. When the modified zeolite dosage was 50 g/L , adsorption time was 40 min,room temperature was 25 ℃,pH was neutral and ultrasonic power was 240 W,ammonia nitrogen removal efficiency was the best. Langmuir and Freundlich adsorption isotherm could describe the adsorption process of modified zeolite to ammonia nitrogen.