遮光曝气组合法控制微囊藻研究

遮光对微囊藻的生长具有明显的抑制作用,论文考察了曝气对微囊藻消亡的促进作用,探索了遮光条件下水柱中微囊藻的垂直迁移特性,在此基础上采用组合连续流水柱试验,考察遮光曝气组合法对微囊藻的消除作用。试验表明,遮光条件下曝气不仅能加速藻类消亡,还能有效起到复氧作用,当气水比为1∶1时,在第6d水中叶绿素a（Chla）的下降率达到74.3%,溶解氧可保持在3.8mg/L左右;在入射光照度100lux遮光条件下,水柱中微囊藻3h后出现明显的表面浮聚现象;组合工艺在含藻水停留时间为4d的条件下,试验期间Chla的平均下降率在75%以上,出水溶解氧保持在4mg/L以上。

Inhibition to the Growth of Microcystis by the Combination of Light Shading and Areation

The growth of Microcystis would be greatly inhibited under the light shading condition. The experiment of aeration on biomass of Microcystis was conducted in the water column. The vertical distribution in the light shading water column was studied. Furthermore, the combination of light shading and aeration on the removal of Microcystis was carried out in the continuous flow condition. The results showed that under light shading condition, aeration could not only accelerate the death of Microcystis, but also renew the DO in the water column, when the gas and water ratio was 1：1, the removal efficiency of Chla could reach 74.3 % in the sixth day, and the DO was above 3.8 mg/L. Microcystis trended to assemble in the surface layer after 3 h in the light shading condition. The continous flow experiment in the combined system showed that the average romoval efficiency of Chla was above 75 %, the DO of effluent was above 4 mg/L when HRT was 4 days.