Research of Purification Effect on Eutrophic Water by Oenanthe Javanica

27 Mar Research of Purification Effect on Eutrophic Water by Oenanthe Javanica

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Abstract

利用聚乙烯板作为浮床栽植水芹( Oenanthe javanica) ， 观测其对 4 组不同富营养化程度水体的净化效果。 结果表明，水芹对总磷( TP) 有较好的去除效果，初始浓度越高去除率越低， 去除率范围 53． 3% ～ 84． 0% ; 水芹对 低于 5 mg L 的总氮( TN) 有较好的去除效果， 去除率也随初始浓度升高而降低， 去除率范围 36． 1% ～ 85． 7% ， 如 果总氮浓度过高( 达到 20 mg L 左右) ，去除效果不明显。试验组氨氮( NH3 -N) 的浓度虽然有明显的降低，但与对 照组比没有明显优势，水芹对亚硝酸盐氮( NO2－ -N) 的去除作用不明显， 硝化细菌对氨氮和亚硝酸盐氮的去除起 主要作用，水芹通过降低水中总氮水平对氨氮和亚硝酸盐氮有一定间接的去除作用。在整个试验过程中，各组高 锰酸盐指数( CODMn) 维持在较低水平( ＜ 3 mg L) ，未观察到栽植水芹对高锰酸盐指数的降低作用

English Abstract

The results showed that water hemlock (Oenanthe javanica) was effective in the removal of total phosphorus (TP) in four groups of water bodies with different levels of eutrophication, with initial concentrations ranging from 53.3% to 84.0%. The results showed that water hemlock was effective in the removal of total phosphorus (TP), the higher the initial concentration, the lower the removal rate, and the removal rate ranged from 53.3% to 84.0%. Although the concentration of ammonia nitrogen (NH3-N) in the experimental group was significantly lower than that in the control group, the removal effect of watercress was not obvious. Although the concentration of ammonia nitrogen (NH3-N) in the experimental group was significantly lower than that in the control group, there was no obvious advantage over the control group. Throughout the test, the permanganate index (CODMn) of each group was maintained at a low level (<3mgL), and no effect of planting watercress on the permanganate index was observed.