不同基质下的苦草去污能力研究

Study on the Decontamination Ability of Vallisneria natants under Different Matrix

[目的]研究不同基质下的苦草去污能力。[方法]开展不同基质下的苦草净水模拟试验,设5个处理:T 1(对照组):底泥+水+苦草(Vallisneria natans),T 2:底泥+2层无纺布+沙+水+苦草;T 3:底泥+2层无纺布+玉米芯+沙+水+苦草;T 4:底泥+2层无纺布+生物质焦+沙+水+苦草;T 5:底泥+2层无纺布+玉米芯+生物质焦+沙+水+苦草。[结果]苦草的5项生理指标显示,基质中添加有机物会促进植物的生长,T 3和T 5试验组中苦草的生长状态最好。4组试验组与对照组相比对水体的净化效果均高于对照组,且T 4试验组的净水效果最好。在最后一次的净化速率对比中,T 5试验组的去除速率最快,净水效果最好。[结论]基质净水在试验初期效果比较好,但根本上对水体的净化还需要依靠沉水植物。

[Objective]To study the decontamination ability of Vallisneria natants under different matrix.[Method]Simulation experiments of V.natans water purification under different substrates were carried out:T 1(control group):sediment+water+V.natans,T 2:sediment+two layers of non-woven fabric+sand+water+V.natans,T 3:sediment+two layers of non-woven fabric+corncob+sand+water+V.natans,T 4:sediment+two layers of non-woven fabric+activated carbon+sand+water+V.natans,T 5:sediment+two layers of non-woven fabric+corncob+activated carbon+sand+water+V.natans.[Result]According to the five physiological indexes of adding organic substances into the matrix could promote the growth of plants,and the growth state of V.natans was the best in T 3 and T 5 test groups.Compared with the control group,the water purification effect of the four groups of tests was higher than that of the control group,and the T 4 test group had the best water purification effect.In the last purification rate comparison,T 5 had the fastest removal rate and the best purification effect.[Conclusion]The effect of matrix water purification is better at the beginning of the experiment,but the purification of water body basically depends on submerged plants.