紫外光浸入式照射对铜绿微囊藻的去除

Microcystis Aeruginosa Removal by Immersed 185nm UV Radiation

摘要:

通过与常规照射方式对比，研究185 nm紫外光浸入铜绿微囊藻溶液中接触式照射对铜绿微囊藻光密度、叶绿素a、可溶性蛋白及细胞结构的影响，考察不同初始质量浓度及通入空气量对各指标去除效果的影响.结果表明，光密度、叶绿素a质量浓度、可溶性蛋白质量浓度最终分别下降87.1%，99.8%和99.7%，去除效果明显优于常规方式的紫外照射.随着初始值的增加，叶绿素a的去除率，可溶性蛋白的降解速率减慢.通气量增加，各指标去除率有所增加，但差异不显著，在浸入照射方式下，氧对紫外光作用的催化效果不明显.185 nm紫外光使铜绿微囊藻的细胞结构短时间受损，胞内物质结构及胞外物质均产生显著变化，藻细胞畸变.185 nm紫外光在浸入方式下，短时间可以有效灭活藻细胞，降低其生理活性及生长速率.浸入式照射的强氧化性使各指标去除效果明显优于常规方式的紫外照射，并在后续培养中未出现光复活现象.

Abstract:

A wavelength of 185nm UV was utilized to threat microsystis aeruginosa by immersing into the solution, optical density, chlorophyll a, soluble protein and cellular structure variation was investigated through contrasting with conventional radiation pattern. The effect of initial algae concentration and aeration capacity was also studied. The results show that, optical density, chlorophyll a and soluble protein decrease by 83.9%, 99.5% and 97.0%, which are much better than those by conventional methods. With the increasing of the initial algae concentration and the aeration capacity, the removal rate of chlorophyll a and soluble protein decrease, but not evidently. That the catalytic effect of oxygen on algae removal is not evident during the immersion. Scan pictures show that 185 nm damaged microsystis aeruginosa cellularity in short time, intracellular and extracellular substance structure changed evidently and algae cell turned to abnormality. Algae growth rate and physiological activity decrease by immersion pattern. Mass of strong oxidized radical acts on the algae cell directly, which removes each item more than conventional UV radiation. And no photo reactivation phenomena appeare in the following cultivation process.