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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