UV Sterilizers by Chiyoda Kohan Chiyoda Kohan Co., Ltd. UV Systems Division.

Transcription

1 UV Sterilizers by Co., Ltd. UV Systems Division. 1

2 Table of Contents 1. What is ultraviolet? 2. Sterilization (inactivation) by ultraviolet 3. Oxidative decomposition of small amounts of organic matters by ultraviolet 4. Decomposition of organic matters by advanced oxidation (UV + oxidizing agents) 5. Types and models of UV s 6. Application 7. Support 2

3 1. What is ultraviolet? A general term for the electromagnetic wave (spectrum) between X-ray and visible light nm (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 Microwave (nm) 3

4 2. Mechanism of inactivation by ultraviolet Ultraviolet Nucleic acid (DNA/RNA) Blueprint of life-form Damage (Destruction/Alteration) Inactivation (No reproduction) The reproduction of DNA will be prevented by ultraviolet radiation that causes the dimerization of DNA base (ex. Thymine dimer). DNA array DNA UV T-T (Thymine-Thymine) DNA base Thymine dimer (6-4) 4

5 2. Comparison of inactivation methods Chlorine / 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 Heat Chlorine, Ozone DNA Bacterium Ultraviolet 5

6 2. Benefits of UV Sterilization 1) No harmful byproduct For 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 microorganism 3) Easy installation, operation and maintenance 4) Economically superior 6

7 2. Required UV dose for various microorganisms Type of Microorganism Required UV dose for 3log Inactivation (mj/cm 2 ) Escherichia coli 10 Escherichia coli (O-157) 4 Legionella pneumophila 4 Pseudomonas aeruginosa 3~4 Germs Salmonella typhimurium 15 Staphylococcus aureus 9 Enterococcus faecalis 10 Bacillus subtilis 8 Bacillus subtilis 43 Fungi Aspergillus niger 568 Protozoa Cryptosporidium parvum 1~2 *Required UV dose will vary depending on the target microorganism to inactivate. 7

8 3. Mechanism of UV-AOP (1) *Highly oxidative hydroxyl radicals ( OH ) are generated by irradiating deep UV light to decompose water. CH3OH (Methanol) HCHO(Formaldehyde) HCOOH(Formic acid) CO2 + H2O UV(184.9nm) H2O OH OH OH OH *Eventually decomposed to carbon dioxide and water *Organic matters to be decomposed by generated OH 8

9 3. Mechanism of UV-AOP (2) 120 kcal /mol 83 kcal /mol 99 kcal /mol 73 kcal /mol 84 kcal /mol 111 kcal /mol 93 kcal /mol OH C-H bond C-N bond C-O bond N-H bond C-C bond O-H bond Chemical bonds of organic matters (such as above) will be ruptured due to the higher energy of OH 9

10 4. Basic Structure of UV- AOP Systems Effluent UV Irradiation Unit * 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. Ozonizer Injection of O3 Ejector Feed 10

11 5. (1) Inline Quartz-Sleeved UV Sterilizers Widely used in sterilizing process water by incorporating into pipeline for a variety of applications. <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 UEX Series UEM Series 11

12 5. (2) Non-Contact Type of Sterilizers Highly corrosive liquids such as sea water and wastewater can be sterilized by using resin for all wetted parts. <Features> LPHO lamps 29 models available <Features> Single lamp system Low cost FDL/FDH Series FDS-1 12

13 5. (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. <Features> LP amalgam lamps 6 models available Wide treatable range for liquid temp (Max. 80 degree-c) NWST Series 13

14 5. (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 <Features> LP mercury lamps For pure water tanks <Features> LP mercury lamps For liquid sugar tanks OF Series STN Series 14

15 5. (5) UV Surface Sterilizers for Caps To be installed above conveyors to sterilize the bacteria and fungi on caps. <Features> LP mercury lamps Lots of experience in PET bottle cap sterilization STO Series 15

16 5. (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. <Features> 184.9nm UV lamps Energy efficient compared to our old TOC-UV models. WOX Series 16

17 5. (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. UV-AOP System 17

18 6. Application Example of UV Systems at Food/Beverage Plants (1) Well water Tap water Raw water tank Sedimentation tank Receiving tank Filter Demineralizer Filling Filter Ion exchanger UV tank Pure water tank Mixing tank Raw materials UV tank UV for low UVT liquids Liquid sugar tank 18

19 6. Application Example of UV Systems at Food/Beverage Plants (2) Well water Tap water Pre-treatment UV tank Pure water tank Mixing tank UV surface PET & glass bottles Rinser Filler Capper Pasteurizer Packaging & shipping Wastewater from washing process Cooling water recirculation Discharge Non-contact type inline UV 19

20 6. Application Example of UV Systems at Pharmaceutical Plants Well water Tap water Activated Ion Carbon Filter Exchanger Filter Use point Purified water UV tank RO Filter (Recirculation pipe) Purified water tank UV tank Filter Use point Storage tank 20

21 6. Application Example of UV Systems at Sugar Plants Raw sugar Tanker truck Activated carbon filter Magma mingler Washed sugar separator Melter Carbonation tower Filter Activated carbon filter Fine liquor Liquid sugar Filter Ion Filter exchanger UV tank Fine liquor tank s for low UVT liquids Refined sugar Packaging & shipping Vacuum crystalizer Separator Dryer Chiller 21

22 6. Application Example of UV Systems at Ultrapure Water Plants Primary water treatment line River water Industrial water Agglutination tower Filter Raw water tank Heat exchanger RO Ion exchanger Degassing tower Ion exchanger RO Primary pure water tank Heat exchanger TOC-UV system Secondary water treatment line UF Use point Recirculation Recycled water storage tank Activated carbon filter Ion exchanger UV-AOP System Activated carbon filter 22

23 6. Application Example of UV Systems at Fish Processing Facilities Sea water Strainer Filter Filtered sea water tank Non-contact type inline UV Chilled sea water tank Fish processing & loading zone Chiller 23

24 6. Application Example of UV Systems at Aquariums Sea water Filter Activated carbon filter Non-contact type inline UV Storage tank Aquarium Non-contact type inline UV Biological filter 24

25 (C) Copyright Co., Ltd. All rights reserved. For inquiries: Dainimarutaka Bldg., Ginza Chuo-ku, Tokyo UV Systems Sales Dept. TEL FAX