不同水动力条件下鲴、三角帆蚌的组合对富营养化水体的净化作用

Purification effect on eutrophic water body with combination of Xenocyprinae and Hyriopsis cumingii under different hydrodynamic conditions

采用恒温循环水槽,研究了在不同水动力条件下,鲴(Xenocyprinae)和三角帆蚌(Hyriopsis cumingii)组合对铜绿微囊藻的控制作用及对水质的影响。结果表明,在光照度2 700 lx、光暗比12 h∶12 h,26.8~27.6℃条件下,中流速(0.06m/s)最适宜铜绿微囊藻生长;低流速(0.02 m/s)组控藻效果最优,对藻细胞的去除率高达(86.11±0.30)%,其次为中流速(0.06 m/s)组,高流速(0.10 m/s)组相对最差,但对藻细胞去除率仍可达到(41.37±0.13)%;水动力条件(流速)对DO浓度影响较大,流速越大,DO浓度越大;对TP、氨氮有明显(P<0.05)的去除作用,最大去除率分别为(60.4±5.5)%、(66.4±1.4)%;但对TN的去除效果不明显(P>0.1),甚至一定程度上增加了水体中的氮负荷,3种(低、中、高)流速下TN浓度相对于初始值增加了(2.1±0.2)%^(19.8±0.2)%。

A study of the combination of Xenocyprinae and Hyriopsis cumingii about controlling Microcystis aeruginosa and the effect of water quality was carried out by using thermostatic cyclic water tank under different hydrodynamic conditions（ flow velocity）. The result showed that under the condition of 2 700 lx,light∶ dark = 12h∶ 12 h,26. 8 27. 6℃,Microcystis aeruginosa grow well in the medium flow velocity（ 0. 06 m / s）. The effect of controlling algae showed best in the low flow velocity group（ 0. 02 m / s） with the removal rate of algae cells as high as（ 86. 11 ± 0. 30） %,and the less better was in the medium flow velocity（ 0. 06 m / s） group,the high flow velocity group（ 0. 10 m / s） was worst among the three groups,but the removal rate of algae cells was also very high,which reached（ 41. 37 ± 0. 13） %. It appeared obvious effect on removal of total phosphorus and ammonia nitrogen（ P < 0. 05）,with the maximum removal rate of（ 60. 4 ± 5. 5） %,（ 66. 4 ± 1. 4） %,respectively. But it showed no obvious effect on removal of total nitrogen（ P > 0. 1）,even aggravated N load in some degrees,which increased（ 2. 1 ± 0. 2） % 19. 8 ± 0. 2 % of the initial in three flow velocities（ low,medium and high velocity）.