气液混合放电特性的研究及灭藻的应用

发布时间：2021-07-22 13:43

　　船舶压载水引起的外来物种的入侵是全世界面临的最严峻的问题之一,它对生态和经济都造成了很大的危害。为了解决这个问题,很多学者提出了许多压载水微生物灭活的解决方案。然而,现有的处理方法还有很多弊端,有些不安全,有些成本太高,因此更有效的处理方法仍然在研究。最近,液相高压脉冲放电等离子体技术已经成为一个非常热门的研究领域,此方法的优点在于成本较低,处理效率高,空间占用量小。本研究是气液混合高压脉冲放电等离子体技术应用于压载水处理进行可行性技术探索,考察液相高压脉冲放电等离子体对藻类的杀灭效果。本实验利用多针对板反应器气液混合放电对四种藻（金藻,新月菱形藻,扁藻,小球藻）的杀灭机制进行了研究。实验分四个方面的内容：（1）多针对板反应器气液混合放电特性的研究；（2）通过发射光谱对放电产生的自由基特性进行了研究；（3）过氧化氢和臭氧的形成机制的研究；（4）放电参数对藻类灭活效果的影响。首先,通过改变放电参数对反应器的放电特性进行了研究,如改变脉冲峰值电压,脉冲频率,水面到针尖的距离（ds）,电导率。此外,实验过程中气相采用四种不同的气体作为放电介质。结果表明,脉冲峰值电压增高,脉冲频率增大,针尖与... 

【文章来源】：大连海事大学辽宁省 211工程院校

【文章页数】：191 页

【学位级别】：博士

【文章目录】：
ABSTRACT
摘要
Chapter 1 Introduction
    1.1 Disasters caused by invasive microorganisms carried in ballast water
    1.2 International actions for ballast water management
    1.3 Ballast water management
        1.3.1 Filtration
        1.3.2 Hydrocyclone
        1.3.3 Clean and recycled ballast water
        1.3.4 Electro-ionization magnetic separation (EIMS)
        1.3.5 Deoxygenation
        1.3.6 Ultraviolet radiation
        1.3.7 Ozone method
        1.3.8 Chemical biocides
        1.3.9 The heat sterilization method
        1.3.10 Ultrasonic method
        1.3.11 Electric field sterilization
    1.4 Review of the research on high-voltage pulse discharge plasma technology
    1.5 Different types of high-voltage pulse discharge reactors
        1.5.1 Point-to-plate reactor
        1.5.2 Multi-pin plate reactor
        1.5.3 Plate-plate reactor
        1.5.4 Plate-pinhole-plate reactor
        1.5.5 Rod-rod reactor
        1.5.6 Packed-bed reactor
        1.5.7 Brush-plate type discharge reactor
        1.5.8 Dielectric barrier discharge reactor
        1.5.9 Multi-wire-to-cylindrical type DBD reactor
        1.5.10 Enhanced corona discharge reactor
    1.6 Pulse discharge plasma oxidation technology
        1.6.1 High voltage electric field
        1.6.2 Formation of active species
        1.6.3 Formation of ozone
        1.6.4 Generation of shock waves
        1.6.5 Generation of ultraviolet
        1.6.6 The role of hydrogen peroxide
    1.7 Gas-liquid hybrid discharge reactor
    1.8 Research methodology and scope of the research
Chapter 2 The Characterstics of Multi-needle Gas-liquid Hybrid Discharge Reactor
    2.1 Basic principles of high-voltage pulse discharge plasma treatment
    2.2 Experimental setup and methods
        2.2.1 High-voltage pulse power supply
        2.2.2 Experimental apparatus and methods
    2.3 Experimental results and analysis
        2.3.1 Voltage and current waveforms
        2.3.2 Corona discharge and spark discharge
        2.3.3 Influence of distance between water surface and needle tips(ds) on the discharge characteristics
        2.3.4 Influence of pulse peak voltage changes on the discharge characteristics
        2.3.5 Influence of pulse frequency changes on the discharge characteristics
        2.3.6 Influence of solution conductivity changes on the discharge characteristics
        2.3.7 Effect of introduced gas types on the discharge characteristics
    2.4 Conclusions
Chapter 3 Characteristics of Active Species Produced in Gas-Liquid Hybrid Discharge
    3.1 Introduction
    3.2 Emission spectroscopy
        3.2.1 Experimental apparatus and methods
        3.2.2 Results and discussion
    3.3 Formation of hydrogen peroxide and ozone
        3.3.1 Introduction
        3.3.2 Experimental apparatus and methods
        3.3.3 Determination of hydrogen peroxide and ozone formations
        3.3.4 Analytical method for hydrogen peroxide
        3.3.5 Results and discussion for hydrogen peroxide formation
        3.3.6 Analytical method for ozone
        3.3.7 Results and discussion for ozone formation
    3.4 Conclusions
Chapter 4 Effects of Multi-Needle Gas-Liquid Hybrid Discharge Parameters upon the Inactivation of Algae
    4.1 Introduction
    4.2 Experimental apparatuses, chemicals and target algae
        4.2.1 Culturing of microorganisms
        4.2.2 Selection of target algae and their characteristics
    4.3 Effects of discharge parameters upon the inactivation of Chlorella spp
        4.3.1 Effects of pulse peak voltage upon the inactivation of Chlorella spp
        4.3.2 Effects of pulse frequency upon the inactivation of Chlorella spp
        4.3.3 Effects of treatment time upon the inactivation of Chlorella spp
        4.3.4 Color changes of Chlorella spp. solution by pulse peak voltage
    4.4 Effects of discharge parameter changes upon the inactivation of Chrysophyta spp
        4.4.1 Effects of pulse peak voltage upon the inactivation of Chrysophyta spp
        4.4.2 Effect of pulse frequency upon the inactivation of Chrysophyta spp
        4.4.3 Effects of treatment time upon the inactivation of Chrysophyta spp
    4.5 Effects of discharge parameter upon the inactivation of Nitzschia closterium f. minutissima
        4.5.1 Effects of pulse peak voltage upon the inactivation of Nitzschia closterium f. minutissima
        4.5.2 Effects of pulse frequency upon the inactivation of Nitzschia closterium f. minutissima
        4.5.3 Effects of treatment time upon the inactivation of Nitzschia closterium f. minutissima
    4.6 Effects of discharge parameter changes upon the inactivation of Platymonas spp
        4.6.1 Effects of pulse peak voltage upon the inactivation of Platymonas spp
        4.6.2 Effects of pulse frequency upon the inactivation of Platymonas spp
        4.6.3 Effects of treatment time upon the inactivation of Platymonas spp
    4.7 Effects of gases bubbling upon the inactivation rate of algae
        4.7.1 Effects of pulse parameters upon the inactivation rate of algae by air bubbling
        4.7.2 Effects of different gases bubbling upon the inactivation rate of Chlorella spp
    4.8 Conclusions
Chapter 5 Investigation of Algae Inactivation Mechanisms
    5.1 Active species mechanisms
    5.2 Hydrogen peroxide and ozone formation mechanisms
    5.3 Algae inactivation mechanisms
    5.4 Conclusions
Chapter 6 Final Conclusions
    6.1 Final summary and conclusion
    6.2 Recommendations and future works
References
Paper List
Acknowledgments
摘要


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期刊论文
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