pH值和光照对镧改性膨润土吸附水中氮和磷的影响  

Effect of pH value and light on La-modified bentonite adsorption of phosphorus and nitrogen in water

作　　者：司静[1,2] 卢少勇[2] 金相灿[2] 蔡珉敏[1] 邓建国[2] 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083 [2]中国环境科学研究院湖泊环境研究中心,国家环境保护湖泊污染控制重点实验室,北京100012

出　　处：《中国环境科学》2009年第9期946-950,共5页China Environmental Science

基　　金：国家水体污染控制与治理科技重大专项(2008ZX07101);国家"863"项目(2005AA60101005);国家"973"项目(2008CB418200)

摘　　要：在不同的pH值和光照条件下考察了镧改性膨润土对模拟农田区河水中氮、磷的去除效果.结果表明,当pH值为4～8时,膨润土对氮和磷的去除效果较好,总氮去除率约82%,最高达93%;在pH值为4～6时,3d后对磷的去除率保持在95%以上,最高达99%.在光照强度为10,20μmol/(m2·s)时,镧改性膨润土的氮、磷吸附效果较好,总氮去除率在第14d前保持在72%以上,光照强度为20μmol/(m2·s),第7d时最大去除率达93%;总磷去除率保持在90%以上.The effect of various pH values and light conditions on the La-modified bentonite removing nitrogen and phosphorus in simulation river water at agricultural zone was studied. The adsorption of the phosphorus and nitrogen were better when the pH value between 4 and 8. Average removal rate of TN by La-modified bentonite was 82% and the maximum removal rate of TN by La-modified bentonite was 93%. When the pH value was 4-6, the removal rate of phosphorus after 3 days maintained higher than 95%, maximum rate was as high as 99%. Laomodified bentonite absorption effects of nitrogen and phosphorus were better when light intensity was 10 and 20μmol/（m^2·s）, bentonite removal rate on TN during the first 14 days remained higher than 72%, when light intensity was 20μmol/L（m^2·s）,the maximum removal was 93% at the 7th day. The average removal rate of phosphorus during the whole process remained higher than 90%.

关 键 词：PH值 光照 镧改性膨润土 磷 氮 

分 类 号：X703.5[环境科学与工程—环境工程]