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以我国典型水华蓝藻铜绿微囊藻为研究对象,考察低剂量UV-C/H_2O_2联用工艺的快速除藻效果并与单独H_2O_2处理进行对比,通过测定藻细胞光合活性及胞内氧化压力以分析杀藻机制,通过测定胞外MC-LR浓度以评价藻毒素释放风险,并考察了水中存在的有机物及还原性无机物对低剂量UV-C/H_2O_2杀藻效果的影响。结果表明,20 m J/cm2的UV-C与≥100μmol/L的H_2O_2联用具有6 h内快速杀藻效果,藻细胞灭活率>1-lg,UV-C和H_2O_2表现出协同效应,所需H_2O_2剂量显著低于单独H_2O_2处理的。低剂量UV-C/H_2O_2处理引起光合活性降低及胞内氧化压力升高,应是藻细胞死亡的重要原因。快速杀藻过程中伴随胞外MC-LR浓度升高6~9倍的风险。水中的有机物及还原性无机物将显著削弱低剂量UV-C/H_2O_2的除藻效果。
In this paper, the cyanobacteria Microcystis aeruginosa, a typical bloom of cyanobacteria in China, was investigated. The rapid algaecidal effect of low-dose UV-C / H 2 O 2 combined process was investigated and compared with H 2 O 2 alone. The photosynthetic activity and intracellular oxidative stress The algicidal mechanism was analyzed. The risk of release of algal toxins was evaluated by measuring the concentration of extracellular MC-LR. The effects of organic and reducing inorganic compounds in water on the killing effect of low-dose UV-C / H 2 O 2 were investigated. The results showed that UV-C of 20 m J / cm2 and H 2 O 2 of ≥ 100 μmol / L had rapid algicidal effect within 6 h, the inactivation rate of algal cells was> 1-lg, UV-C and H 2 O 2 showed synergistic effects, The required dose of H 2 O 2 was significantly lower than that of H 2 O 2 alone. Low dose of UV-C / H 2 O 2 treatment caused a decrease of photosynthetic activity and increased intracellular oxidative stress, which should be the important reason of algal cell death. Rapid algal killing with extracellular MC-LR concentration increased 6 to 9 times the risk. Organic matter in water and reducing inorganic substances will significantly weaken the low-dose UV-C / H_2O_2 algae removal effect.