Microcystis aeruginosa removal by immersed 185 nm UV radiation

A wavelength of 185 nm 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.