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Research on Biological Inactiation of Ballast Water with Uv/o 3 /ag-tio2 System

Author: DuJiaZuo
Tutor: YouHong
School: Harbin Institute of Technology
Course: Environmental Science and Engineering
Keywords: Ballast water UV/O3/Ag-TiO2 Inactivated Marine bacteria Microalgae
CLC: X703.1
Type: Master's thesis
Year: 2010
Downloads: 123
Quote: 0
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Abstract


Ships' ballast water is a modern ocean-going vessels sailing safe and efficient operation of the guarantee, and how to control ballast water prevalence of pest, however, has become a worldwide environmental problems. Photocatalytic and ozone union of the two technologies, not only enhance the photocatalytic oxidation of capacity, while reducing the amount of ozone in cost savings, but also expanded the scope of the processing. So we used in the process deal with ballast water microorganisms, both to meet the standards of the ballast water treatment, but also to achieve efficient processing device miniaturization, the ship's ballast water treatment to protect the environment and achieve sustainable development The significance. Create UV / O , 3 / the Ag - TiO 2 inactivated reaction apparatus to achieve the miniaturization of the reaction processing apparatus through both on the UV / O , 3 < / sub> / Ag-TiO 2 composite the seawater microbial inactivation effect the determination of proved UV / O 3 / Ag-TiO 2 composite inactivated reaction device feasibility and efficiency. Different reaction system to handle the inactivation of marine bacteria and microalgae were measured, and results show that UV light intensity 6.5 mW/cm2 ozone dosage of 4.92 g / h, processing water 500L / h, UV / the O 3 / Ag-TiO 2 for 3 seconds after treatment after 3 seconds Dunaliella salina, the former ditch E. coli, enterococci and Vibrio alginolyticus inactivation rate of more than 4.8 lg; algae and Phaeodactylum the the algae algae rates were 0.92lg, 0.60lg and 0.57lg. UV / O 3 / Ag-TiO 2 sterilized one second can be achieved by the requirements of the Convention, algae could be reached for 1 second UV / Ag-TiO 2 and the O 3 for 3 seconds alone the same effect, from the processing costs to consider if they can obtain the same treatment effect, UV / O 3 / Ag-TiO < sub> 2 composite technology UV radiation intensity and ozone dosage amount can save 67%. Due to the hydraulic retention time is greatly shortened, the processing apparatus of ballast water volume may also be reduced, thereby greatly reduce the cost of processing, proved UV / O , 3 / the Ag - TiO 2 composite technology in dealing with ballast on the superiority of the microorganisms in water. Investigated the O 3 and UV / Ag-TiO 2 in UV / O , 3 / Ag-TiO 2 role in the process of sterilization algae, studies show that increased UV radiation intensity and ozone dosage, composite sterilization effect increases: 6.5 mW/cm2 UV light intensity, ozone dosage increased to 7.28 from 1.30 g / h g / h, UV / O 3 / Ag-TiO 2 sterilization rate for 4.0 lg increased to 4.85lg; ozone dosage amount of 4.92 g / h, UV radiation intensity rose to 1.2 mW/cm2 the 6.5 mW/cm2 when the the sterilization rate from 3.5lg increased to 4.8lg, visible ozone UV / O 3 / Ag-TiO 2 off The bacteria process than UV radiation effect is significant. O 3 in Algicide process has become a main material, with the dosage increased rate of algae increased more significantly. UV / O 3 / Ag-TiO 2 dealing with marine bacteria and microalgae the surface structure of the extent of the damage were significantly higher than O 3 and UV / Ag-TiO 2 alone, direct proof UV / O 3 / Ag-TiO 2 complex on the surface of the ballast water of microorganisms destruction has certain advantages. UV / O 3 / Ag-TiO 2 treatment of ballast water microorganisms, interested in cell membrane lipid peroxidation, cell membrane rupture K, protein substances leakage intracellular SOD biosynthesis ability to enhance a short period of time. Speculated that protein leakage may not be the main reason to cause cell death, cell membrane permeability changes in cell destruction has a supporting role, it is important reason is to improve the sterilization rate. Ozone may be the main reason of the destruction of the cell membrane, and UV / Ag-TiO 2 and ozone combined with more effect on the cell membrane and even the most serious cell damage, from the microscopic point of view proved UV / O < sub> 3 / Ag-TiO 2 Complex Process damaging effects of micro-organisms in ballast water efficient, rapid, thorough, there is a significant advantage.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization > Technology and methods
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