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研究生:賴宣琳
研究生(外文):KathleenLansigan
論文名稱:臭氧降解水中微囊藻及其代謝物之動力研究
論文名稱(外文):Degradation and Metabolites of Microcystis aeruginosa during Ozonation: Kinetic Study
指導教授:林財富林財富引用關係
指導教授(外文):Tsair-Fuh Lin
學位類別:碩士
校院名稱:國立成功大學
系所名稱:環境工程學系碩博士班
學門:工程學門
學類:環境工程學類
論文種類:學術論文
論文出版年:2012
畢業學年度:100
語文別:英文
論文頁數:69
外文關鍵詞:ozoneMicrocystisaeruginosaβ-cyclocitralcyanotoxinskinetics
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The occurrence of cyanobacteria or blue-green algae in drinking water systems is potentially harmful for human health. Among the common problems associated with it include the production of toxins and undesirable taste and odor (T&O). One of the most common toxin-producer among cyanobacteria is Microcystisaeruginosa. This species is capable of producing microcystins, a group of cyanotoxins which exhibit chronic effects on humans and wildlife by damaging the liver. Microcystis blooms can also produce β-cyclocitral, a malodor that gives a hay-tobacco odor.Oxidants, such as ozone, are mostly used for controlling cyanobacteria in drinking water treatment processes. The oxidation of the contaminants can occur via ozone’s decomposition into ozone (molecular ozone) or OH radicals (•OH). In this ozonationstudy, the degradation kinetics of the cell integrity and metabolites were evaluated. The Rctconcept,involving the use of a probe compound (para-chlorobenzoic acid), was applied to indirectly measure •OH.
The cyanobacteria-laden water exhibited two phases of Rcts for the batch reactions, as expected from previous studies of natural waters. Rctis highly dependent on the initial ozone and cell concentrations. Semi-batch reactions were done to obtain rate constants for•OH and cell integrity and metabolites. A value of 6.35×109M-1s-1and 4.99×109M-1s-1were determined for k_(cell integrity/•OH )and k_(β-cyclocitral/•OH ),respectively.
A model describing cell rupture and microcystin release and degradation was established for the ozonation of M. aeruginosa. The extracted parametersfor radical concentration estimation and cell rupture kinetics, and the literature value of microcystin degradation rate constant were used for the model predictions. The model was able to predict the kinetics of cell rupture and change of microcystin concentrations in the system, suggesting the model is reasonable.

Abstract I
Acknowledgements III
Table of Contents V
List of Tables VII
List of Figures VIII
Chapter 1 Introduction 1
1.1 Background 1
1.2 Objectives of the Study 3
Chapter 2 Review of Related Literature 5
2.1 Cyanobacteria 5
2.2 Ozone 10
2.2.1 Mechanisms 12
2.2.2 The Rct Concept 16
2.3 Ozonation of Cyanobacteria 21
Chapter 3 Materials and Methodolgy 23
3.1 Process Flow of the Study 23
3.2 Microcystis aeruginosa culture 24
3.2.1 Cell counting 24
3.3 Ozonation Experiments 25
3.3.1 Batch Set-up 25
3.3.2 Semi- Batch Set-up 27
3.4 Analytical Methods 28
Chapter 4 Results and Discussion 31
4.1 Ozonation of Microcystis aeruginosa 31
4.1.1 Decay of Cell integrity and Ozone 31
4.1.2 Decay of Beta-Cyclocitral and Ozone 34
4.2 Determination of Rct values 38
4.3 Determination of kO3 value 41
4.4 Determination of kOH value 42
4.5 Semi-batch Ozonation Experiments 46
4.5.1 Determination of Rct values 46
4.5.2 Determination of kOH value 48
4.6 Release of the metabolite β-cyclocitral during ozonation 51
4.7 Microcystins decay during semi-batch ozonation 53
4.7.1 Microcystin release and degradation 53
4.7.2 Prediction of microcystin release and degradation 56
Chapter 5 Conclusions and Recommendations 61
5.1 Conclusions 61
5.2 Recommendations 62
References 65

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