氧化镧改性沸石除磷脱氮研究  

Nitrogen and Phosphate Removal by Activated Zeolite with Lanthana

作　　者：李彬[1] 宁平[1] 陈玉保[1] 邓春玲[1] 江喆[1] 

机构地区：[1]昆明理工大学环境科学与工程学院,昆明650093

出　　处：《武汉理工大学学报》2005年第9期56-59,共4页Journal of Wuhan University of Technology

基　　金：云南省自然科学基金(2000B0023M).

摘　　要：在镧离子质量浓度0.5%,pH为10下浸渍16 h以上,于110 ℃干燥陈化24 h后,再于450～500 ℃焙烧1 h,冷却后过筛取筛下粒径120 目以上为最佳稀土吸附剂,用于静态同步脱氮除磷试验.结果表明,对正磷和氨氮的进水最佳 pH 为4,此时最大静态吸附分别达到25 mg/g和50 mg/g;当进水pH为4～8,氨氮浓度为10 mg/L,正磷浓度5 mg/L时,出水pH在6～9之间,对二者的去除效率分别达到80%和99%,吸附剂再生7次后对氮磷的去除率仍然保持在80%以上,动力学符合Freundlich吸附模型,相关系数在0.99以上.为处理微污染的氮磷提供了一条新的途径.Adsorbent was firstly immersed in solution of La^3 ＋ with concentration of 0.5% and pH of 10 for more than 16 h; secondly it was dried up and stabilized at temperature of 110℃ for 24 h; then it was roasted at temperature between 400 500℃ for 1 h; finally that with radius more than 120 mesh was chosen to remove ammonia nitrogen and phosphate synchronously in static experiment. According to this experiment, optimal pH was 4 and the largest static adsorbing capacities for NH4^＋ -N and H2PO4 were 25 mg/g and 50 mg/g respectively. In influence of NH4^＋ -N and H2PO4^- with concentrations of 10 mg/L and 5 mg/L respectively, following results can be identified： removal efficiencies can reach 80% and 90% respectively; Removal efficiencies were still more than 80% after being regenerated for 7 times; Dynamics for this process was in accordance with Freundlich adsorption model with a correlation efficient of more than 0.99. This experiment provided a new way for treatment of NH4^＋ -N and H2PO4 in slightly polluted water.

关 键 词：稀土镧 改性沸石 除磷脱氯 动力学方程 

分 类 号：X703.1[环境科学与工程—环境工程]