低温条件下3种填料吸附氨氮的研究

Ammonia nitrogen adsorption onto volcanic rocks,haydites and zeolites at low temperatures

通过对低温下（5~15℃）火山岩、陶粒、沸石吸附水中氨氮的静态、动力学和热力学试验,分析探究低温条件下曝气生物滤池填料对水中氨氮的吸附能力。结果表明：火山岩、陶粒、沸石均在50 min内达到动态吸附平衡;在5、15℃时,沸石对20 mg/L氨氮吸附的平衡吸附量分别为0.120 8、0.138 4 mg/g,陶粒为0.117 6、0.125 9 mg/g,火山岩为0.059 3、0.074 2 mg/g;从15℃降低到5℃,火山岩、陶粒、沸石的平衡吸附量分别下降20.08%、6.60%、12.72%;通过等温模型拟合发现,在5~15℃温度条件下3种填料对氨氮均以单层吸附为主,吸附作用明显,且吸附反应为吸热反应。

In order to explore the ammonia nitrogen adsorption by BAF tittering materials at low temperatures, the static adsorption experiment, dynamic and thermodynamic analysis on haydites, zeolites and volcanic rocks were studied from 5 to 15℃. It is shown that all the filtering materials reach a dynamic adsorption equilibrium in 50 min. At 5℃ and 15℃, the adsorption quantity on zeolites can reach O. 120 8 mg/g and 0. 138 4 mg/g, on haydites 0.117 6 mg/g and O. 125 9 mg/g,and on volcanic rocks O. 059 3 mg/g and O. 074 2mg/g, when the ammonia nitrogen concentration is 20 mg/L. When the temperature drops from 15℃ to 5℃, the adsorption abilities of volcanic rocks,haydites and zeolites decrease by 20.08% ,6.60% and 12.72% ,respectively. Though fitting equations in 5 to 15℃ levels, it is found that the three filtering materials have obvious adsorption, mainly being monolayer adsorption, and the adsorption process is endothermic.