【作者】 景江；

【导师】 赵开弘；

【作者基本信息】 华中科技大学 ， 生态学， 2006， 硕士

【摘要】 从20世纪50年代以来,由于人口急剧增长,工业化和城市化进程的加快,大大增加了氮、磷营养物质向水体的排放量,加快了湖泊等水体富营养化状况,由此引起的蓝藻“水华”对水生环境造成的危害非常严重。本研究着手探索浸没式UV-C技术用于“水华”的防治,以“水华”蓝藻中常见的鱼腥藻(Anabaena)为受试藻种,分别设计了浸没式UV-C技术抑藻实验、研究了UV-C/ H2O2催化氧化去除鱼腥藻PCC 7120的效果,探讨了各种因素如H2O2浓度、pH值、紫外光照强度及反应时间对除藻的影响。H2O2对UV-C灭藻具有协同作用,UV-C/H2O2高级氧化体系对鱼腥藻PCC 7120具有很强的氧化能力。H2O2在藻液中浓度为1 mmol/L,反应温度为25℃、pH值为6.8、紫外光光照强度0.430 mw/cm2及反应时间20 min的条件下,受试藻种的去除率5天后可以达到85%以上。将H2O2和我们设计的浸没式UV-C流动除藻装置结合进行流动式的灭藻实验,除藻效果显著,鱼腥藻PCC 7120体内的SOD、POD酶的活性及C-PC藻蓝蛋白、叶绿素a的含量都有大幅度的下降,且杀灭后的蓝藻不会重新生长。更多还原

【Abstract】 Since1950’s, because the population increases sharply, industrialization and urbanization comes quickly, the nitrogen and phosphorus level become more and more in the water, which quicken the eutrophication of the lake. The aquatic environment damage of cyanobacteria water bloom is very serious.Our study mainly explored submerged UV-C technology application for water bloom control. The present article reports investigation on degradation of cyanobacteria by the combination of UV-C and H2O2. We choose Anabaena sp. PCC 7120 for experiment. In addition, we have also investigated the likely influencing factors, such as H2O2 dosage, pH values, UV light intensities, and the reaction time on the degradation of Anabaena sp. PCC 7120. The result showed that UV-C and H2O2 have intensive oxidation ability to Anabaena sp. PCC 7120. After 5 days, the elimination rate of Anabaena sp. PCC 7120 was to reach 85% under the experimental conditions of H2O2 dosage 1mm/L, with the reaction temperature 25℃, pH 6.8, UV light intensity 0.430mw/cm2 and reaction time 20 minutes. UV-C technology and H2O2 was used to an analog experiment for degradation of cyanobacteria in the condition of flowing. SOD and POD and Chl a in Anabaena sp. PCC 7120 was almost be degraded.更多还原