UV Sterilizers by Chiyoda Kohan · O3 Ejector Feed Basic Structure of UV- AOP Systems * Large...
Transcript of UV Sterilizers by Chiyoda Kohan · O3 Ejector Feed Basic Structure of UV- AOP Systems * Large...
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UV Sterilizers by Chiyoda Kohan
2017.9.20 Chiyoda Kohan Co., Ltd.
UV Systems Division.
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Table of Contents
Chiyoda Kohan
1. What is ultraviolet?2. Sterilization (inactivation) by ultraviolet3. Oxidative decomposition of small amounts of organic
matters by ultraviolet4. Decomposition of organic matters by advanced oxidation
(UV + oxidizing agents)5. Types and models of UV sterilizers6. Application7. Support
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What is ultraviolet?
A general term for the electromagnetic wave (spectrum) between X-ray and visible light
100 - 400nm (1nm = 0.001µ)� Characteristics of electromagnetic waves are different depending on
the wavelength.
Name Spectrum Applications/Characteristics
X-ray ~ 1nm X-ray examination
Ultraviolet 1 ~ 400nm Disinfection / Photochemical reaction
Visible light 400~800nm Purple, Blue, Green, Yellow ~ Red
Infrared / Microwave 1um ~ Several cm Heating
Radio wave Several m - km Radio / TV
X-ray Ultraviolet Visible light Infrared Microwave100 400 800 (nm)
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The reproduction of DNA will be prevented by ultraviolet radiation that causes the dimerization of DNA base (ex. Thymine dimer).
Mechanism of inactivation by ultravioletUltraviolet
Nucleic acid (DNA/RNA)Blueprint of life-form Damage
(Destruction/Alteration)
Inactivation(No reproduction)
DNA
T-T (Thymine-Thymine)
DNA base
UV
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DNA array
Thymine dimer (6-4)
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Comparison of inactivation methodsChlorine / Ozone
− Breaks the cell membrane
Heat
− Transforms the protein of the cytoplasm
Ultraviolet
- Destructs the DNA inside the cell
⇒No UV-resistant bacteria is confirmed so far
⇒Very effective for heat-resistant bacteria/viruses
⇒Especially lethal for inactivation of cryptosporidium Bacterium
Chlorine, Ozone
Heat
Ultraviolet
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DNA
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Benefits of UV Sterilization
1) No harmful byproductFor example, Chlorine is toxic itself and may produce unwanted byproducts, which can be harmful to human bodies. Meanwhile, ultraviolet does not change the quality of water and leaves no toxic chemical residue in the water to be processed (No change in pH, flavor, or taste). Also, no trihalomethan will be produced if UV is used to disinfect the water � Friendly to environment
2) Lethal to any microorganism3) Easy installation, operation and
maintenance4) Economically superior
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Required UV dose for various microorganisms
Type of Microorganism
Required UV dose for 3log Inactivation
(mJ/cm2)
Germs
Escherichia coli 10
Escherichia coli (O-157) 4
Legionella pneumophila 4
Pseudomonas aeruginosa 3~4
Salmonella typhimurium 15
Staphylococcus aureus 9
Enterococcus faecalis 10
Bacillus subtilis 8
Bacillus subtilis 43
Fungi Aspergillus niger 568
Protozoa Cryptosporidium parvum 1~2
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*Required UV dose will vary depending on the target microorganism to inactivate.
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Mechanism of UV-AOP (1)Chiyoda Kohan3.
UV(184.9nm)
H2O ・OHCH3OH (Methanol)
・OH HCHO(Formaldehyde)
・OH HCOOH(Formic acid)
・OH CO2 + H2O
*Highly oxidative hydroxyl radicals (・OH ) are generated by irradiating deep UV light to decompose water.
*Organic matters to be decomposed by generated・OH
*Eventually decomposed to carbon dioxide and water
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C-C bondC-H bond C-N bond C-O bond O-H bondN-H bond•OH
83 kcal
/mol
99 kcal
/mol
111 kcal
/mol84 kcal
/mol73 kcal
/mol
93 kcal
/mol
120 kcal
/mol
Chemical bonds of organic matters (such as above) will be ruptured due to the higher energy of •OH
Mechanism of UV-AOP (2)
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Injection of O3
Ejector Feed
Basic Structure of UV- AOP Systems
* Large amount of hydroxyl radicals (・OH ) with strong oxidizing effect by irradiating UV to oxidizing agents such as ozone, hydrogen peroxide, etc.).* Higher concentration of organic matters can be decomposed than oxidation of organic matters by 184.9nm UV.
UV Irradiation Unit
Ozonizer
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Effluent
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(1) Inline Quartz-Sleeved UV Sterilizers
� Widely used in sterilizing process water by incorporating into pipeline for a variety of applications.
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UEX Series UEM Series
<Features>・LPHO lamps・10 models available・Many optional functions
<Features>・LP amalgam lamps・Applicable to wide range of water temp ・6 models available・Many optional functions
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(2) Non-Contact Type of Inline UV Sterilizers
� Highly corrosive liquids such as sea water and wastewater can be sterilized by using resin for all wetted parts.
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FDL/FDH Series FDS-1
<Features>・LPHO lamps・29 models available
<Features>・Single lamp system・Low cost
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(3) Inline Quartz Sleeved UV Sterilizers for Low UVT Liquids
� Stirring effect by baffle plates incorporated inside the chamber leads to the sterilization of low UVT liquids such as liquid sugars and beverages.
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NWST Series
<Features>・LP amalgam lamps・6 models available・Wide treatable range for liquid temp (Max. 80 degree-C)
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(4) UV Sterilizers for Liquid Storage Tanks
� To be installed on the sides or head space of tanks to suppress the reproduction of bacteria and fungi by irradiating UV onto the inner surfaces of storage tanks, the liquid surfaces, and in the middle of stored
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OF Series STN Series
<Features>・LP mercury lamps・For pure water tanks
<Features>・LP mercury lamps・For liquid sugar tanks
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(5) UV Surface Sterilizers for Caps
� To be installed above conveyors to sterilize the bacteria and fungi on caps.
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STO Series
<Features>・LP mercury lamps・Lots of experience in PET bottle cap sterilization
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(6) TOC-UV Systems for organic matter decomposition
� UV systems making use of photochemical reactions by deep UV light (184.9nm) to decompose small amounts of organic matter for ultra pure water lines of semiconductor fabs.
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WOX Series
<Features>・184.9nm UV lamps・Energy efficient compared to our old TOC-UV models.
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(7) Organic Matter Decomposition Systems (AOP: Advanced Oxidation Process)
� UV-AOP systems decompose organic matter by chemical reactions of UV and oxidizing agents (ozone, H2O2, etc.) to be used in treating wastewater from factories.
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UV-AOP System
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Application Example of UV Systems at Food/Beverage Plants (1)
Well waterTap water
Sedimentation tank
Receivingtank
Demineralizer
Ion exchanger
Pure water tank
FilterInline UV sterilizer
Inline UV sterilizer
Raw water tank
Filter Inline UV sterilizer
UV tank sterilizerInline UV sterilizer
Inline UV sterilizer
Mixing tank
UV tank sterilizer
Liquid sugar tank
UV sterilizer for low UVT liquids
Rawmaterials
Filling
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Application Example of UV Systems at Food/Beverage Plants (2)
Mixing tank
Pure water tank
UV tank sterilizer
Inline UV sterilizer
Well waterTap water Pre-treatment
PET & glass bottles Rinser Filler Capper Pasteurizer
UV surface sterilizer
Packaging & shipping
Inline UV sterilizer
Cooling water recirculation
Wastewater from washingprocess
Non-contact typeinline UV sterilizer
Discharge
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Application Example of UV Systems at Pharmaceutical Plants
Well waterTap water
Purifiedwatertank
Filter
Inline UV sterilizer
UV tank sterilizer
Inline UV sterilizer
Activated Carbon Filter
IonExchanger
Filter Usepoint
Purifiedwater
FilterRO
Storage tank
UV tank sterilizer Inline UV
sterilizer
Usepoint
(Recirculation pipe)
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Application Example of UV Systems at Sugar Plants
Rawsugar
Activatedcarbonfilter
FilterMagmamingler
Washedsugarseparator
Melter Carbonationtower
Tankertruck
Activatedcarbonfilter
Filter Ionexchanger
Filter
Fine liquor
UV tank sterilizer
Fineliquor tank
Inline UV sterilizersfor low UVT liquids
Liquid sugar
Vacuumcrystalizer
Separator Dryer Chiller
Refined sugar
Packaging & shipping
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Application Example of UV Systems at Ultrapure Water Plants
River waterIndustrial water
Agglutinationtower
Filter Raw watertank
Heatexchanger
ROIon exchanger
IonexchangerDegassing
tower
RO
Primarypure watertank
Heatexchanger UF
UsepointInline UV
sterilizer
Inline UV sterilizer
Primary water treatment line
Secondary water treatment line
TOC-UV system
Ionexchanger
Activatedcarbonfilter
Recycledwater storagetank
UV-AOPSystem
Activatedcarbonfilter
Inline UV sterilizer
Recirculation
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Application Example of UV Systems at Fish Processing Facilities
Sea water
FilterStrainerFiltered sea watertank
Non-contact typeinline UV sterilizer
Chilled sea water tank
Fish processing & loading zone
Chiller
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Application Example of UV Systems at Aquariums
Seawater
Activatedcarbonfilter
Filter Non-contact typeinline UV sterilizer Storage tank
AquariumNon-contact typeinline UV sterilizer
Biologicalfilter
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(C) Copyright
Chiyoda Kohan Co., Ltd.
All rights reserved.
Chiyoda Kohan
For inquiries:Dainimarutaka Bldg., 7-13-8 GinzaChuo-ku, Tokyo 104-8115UV Systems Sales Dept.TEL 03-3547-1277 FAX 03-5550-1272http://www.chiyodakohan.co.jp