9种水生植物对模拟污水中氮、磷的生物净化效果

通过9种水生植物在模拟污水中的培养试验,研究其对模拟污水中氨氮、总氮、总磷的去除效果,从中筛选出适用于治理城市污水的水生植物.结果表明,不同浓度下随着培养时间的延长,9种水生植物对氨氮、总氮、总磷的去除率逐渐增加.低浓度下,空心莲子草对氨氮的去除率最高(53.79%),荷花对总氮的去除率最高(48.75%),凤眼莲对总磷的去除率最高(70.10%);中浓度下,凤眼莲对氨氮的去除率最高(61.39%),茭白对总氮的去除率最高(52.23%),凤眼莲对总磷的去除率最高(80.15%);高浓度下,茭白对氨氮的去除率最高(55.70%),凤眼莲对总氮和总磷的去除率均最高(分别为40.42%和69.58%).可见,凤眼莲、空心莲子草、茭白3种植物对氮磷具有较好的去除效果,是较好的湿地植物.

Biological purification effect of nine aquatic plants on N and P from simulation wastewater

Through culturing aquatic plants on simulation wastewater,the removal capacities of total nitrogen,ammonia nitrogen,total phosphorus of nine aquatic plants were researched,and aquatic plants with good removal effect were screened out. With the increase of culture time,the removal rate of nine kinds of aquatic plants to three kinds of pollutants was gradually increased.At low concentrations,the removal rate of Alternanthera philoxeroides to ammonia nitrogen was the greatest(53.79%),the removal rate of Nelumbo nucifera to total nitrogen was the greatest(48.75%),the removal rate of Eichhornia crassipes to total phosphorus was the greatest(70.10%). In moderate concentrations,the removal rate of Eichhornia crassipes to ammonia nitrogen was the greatest(61.39%),the removal rate of Zizania latifolia to total nitrogen was the greatest(52.23%),and the removal rate of Eichhornia crassipes to total phosphorus was the greatest(80.15%).At high concentrations,the removal rate of Zizania latifolia to ammonia nitrogen was the greatest(55.70%),the removal rate of Eichhornia crassipes to total nitrogen and total phosphorus was the greatest(respectively for 40.42%,69.58%).Therefor,Eichhornia crassipes,Alternanthera philoxeroides,Zizania latifolia had good removal efficiency,and were better wetland plants.