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题名	H2O2杀灭水华蓝藻效率优化及胞外聚合物作用分析
作者	李雷
答辩日期	2017-05-01
文献子类	硕士
授予单位	中国科学院大学
授予地点	新疆乌鲁木齐
导师	潘响亮
关键词	蓝藻水华 H2O2 铁盐催化 胞外聚合物 cyanobacterial bloom H2O2 ferric salt EPS
学位专业	工程硕士
英文摘要	Cyanobacterial bloom is one of the hot environmental issues which should be resolved for domestic and international researchers. Many freshwater lakes in China at present are in a state of moderate or severe eutrophication, and faced with blooms outbreak constantly, H2O2 has strong oxidizing properties, and can generate strong killing-effect to water bloom cyanobacteria, the final products are H2O and O2, which will not cause environmental pollution. Ferric salts can catalyze H2O2 to generate much more ·OH, consequently enhance the oxidation properties significantly, therefore a small amount of iron addition can not only reinforce the algae-killing effect of H2O2, but also save the dosage of H2O2, this process provides a new approach for the control of water bloom cyanobacteria.Dominant species include many common and specific water-blooming cyanobacteria when the blooms break out in china lakes, and the algicidal effect of H2O2 to specific water-blooming cyanobacteria is different. the catalysis of ferric salt and light is quite important during controlling algal bloom, and exopolymers also play a key role in the algicidal process of H2O2, it’s therefor necessary to study the impact of above-mentioned factors.the aim of this research is to investigate the algicidal effect of H2O2 with organic and inorganic iron as a catalyst. Chlorophyll fluorescence Fv/Fm is regarded as an index, this assay also studies the function and changes of extracellular polymers(EPS) and cell membrane during H2O2 killing the cyanobacteria by batch experiments , the main results were as follows:(1) The effectiveness of iron salts is assessed by Chlorophyll fluorescence, the algicidal effect of H2O2 is ralatively poor with FeSO4 as catalyst, while the effect of H2O2 to kill algae under light with EDTANaFe as catalyst is quite good. Light radiation can significantly enhance the algicidal effect of H2O2 in the process of algae control.(2) Algae-killing effect of H2O2 with FeSO4 as catalyst is not good, the reason is summarized as follows; at neutral or slightly alkaline condition, Fe2+ is oxidized into Fe3+ and the partical size of solution increases, consequently forming precipitation when adding FeSO4, and leading to interruption of Fenton reaction, while EDTANaFe can keep the iron at the state of complexation, and mantain the Fenton reaction.(3) By comparison of killing effect between main eight kinds of cyanobacteria with H2O2 using EDTANaFe as catalyst, we find that the algicidal effect of H2O2 differences along with various algae, Microcystis ichthyoblabe is scarcely damaged by H2O2 and EDTANaFe(H2O2=10 mg L-1, Fe2+=3 mg L-1), Microcystis aeruginosa is also not easy to damaged by H2O2 and EDTANaFe, while other cyanobacterias are strongly damaged by H2O2 and EDTANaFe .(4) Extracellular polymers (EPS) play an important role when H2O2 kills algae, cyanobacteria cells without EPS are quite sensitive to H2O2, but the damage of H2O2 to them is still different among the species. As for Microcystis ichthyoblabe, H2O2(10mg L-1) has little impact on it even though the aglae has been extracted EPS, but for other algaes, the decline in Fv/Fm of Cell-EPS is 1.5~2 times of that of Cell+EPS after adding same H2O2, which shows that EPS could scavenge about half of H2O2. (5) H2O2 can increase the permeability of cell menbrane as well as damage the cell membrane, and the level of damage is positively correlated with the decilne in Fv/Fm, therefore the permeability change of cell membrane can be regard as an index of damaging to algae(6) TOC changes little during the algicidal process by low-concentration H2O2, while half of protein and parts of polysaccharide are suffered structure changes including the decrease in molecule weight .
语种	中文
学科主题	环境工程
内容类型	学位论文
源URL	[http://ir.xjlas.org/handle/365004/14883]
专题	新疆生态与地理研究所_研究系统_荒漠环境研究室
作者单位	中国科学院新疆生态与地理研究所
推荐引用方式 GB/T 7714	李雷. H2O2杀灭水华蓝藻效率优化及胞外聚合物作用分析[D]. 新疆乌鲁木齐. 中国科学院大学. 2017.

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