摘要
采用浙江某地天然沸石吸附废水中低浓度氨氮,研究了pH、天然沸石投加量对吸附的影响,分析了吸附等温线和吸附动力学,并进行了动态吸附和脱附研究。结果表明,pH对天然沸石吸附有较大影响,吸附的最佳pH为8.0;随着天然沸石投加量的增加,氨氮的去除率逐渐增大,但吸附量随之减小。Freundlich方程比Langmuir方程更好地描述氨氮在天然沸石上的吸附行为,且此吸附是优惠吸附。假二级方程很好地拟合吸附动力学实验数据,吸附速率常数k2随着天然沸石投加量的增大而增大。装填105g天然沸石吸附柱处理含氨氮20mg/L废水的水量为15L,出水氨氮浓度小于5mg/L。用含氯化钠和氢氧化钠的溶液作为脱附剂,脱附率为95.5%。
The natural zeolite in Zhejiang Province was used to adsorb ammonium-nitrogen from low concentration wastewater. Effects of pH and natural zeolite dose on the adsorption were studied,the adsorption isotherm and kinetics were analyzed,and dynamic adsorption and desorption were conducted. It was found that the adsorption amount significantly depends on pH,the adsorption amount at pH 8.0 is maximum. The adsorption removal rate increases with increasing natural zeolite dose,however,adsorption amount decreases w...
出处
《环境科学与技术》
CAS
CSCD
北大核心
2010年第12期206-209,共4页
Environmental Science & Technology
基金
国家水体污染控制与治理科技重大专项“十一五”太湖水专项(2008ZX07101-004)
江苏政府留学奖学金(2008年)
关键词
天然沸石
氨氮
吸附
脱附
natural zeolite
ammonium-nitrogen
adsorption
desorption
