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%.
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
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)
关键词
PH值
光照
镧改性膨润土
磷
氮
pHvalue, light
La-modifiedbentonite
phosphorus
nitrogen
