pH值和光照对镧改性膨润土吸附水中氮和磷的影响

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.

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

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%. La-modified bentonite absorption effects of nitrogen and phosphorus were better when light intensity was 10 and 20μmol/(m2·s), bentonite removal rate on TN during the first 14 days remained higher than 72%, when light intensity was 20μmol/(m2·s),the maximum removal was 93% at the 7th day. The average removal rate of phosphorus during the whole process remained higher than 90%.