UV Disinfection Systems K Series - Etusivu - Hyxo · UV Disinfection Systems K Series ... UV...

DIN EN ISO 9001DIN EN ISO 14001

UV Disinfection Systems K Series

Clean and Healthy Drinking Waterwith Ultraviolet Disinfection

ITT IndustriesEngineered for life

WEDECO


bacteria in water is reduced by afactor of 106 by this UV dosage andthe number of hygiene-relevantviruses and parasites is reduced by afactor of 104 (Source: ÖNORMM5873-1). These certificates are nowalso recognized in Norway, Canadaand the USA. WEDECO’s productseries can handle water flow ratesranging from 1 m3/h to severalthousand m3/h with certifiedsystems.

WEDECO offers the most technicallyadvanced and economically effectivesolution, with the competencegained in 50 years of experience indrinking water disinfection withmore than 50,000 installed largedrinking water systems.

Certified UV systems

In 1993, a research project promotedby the Federal Republic of Germanydemonstrated the effectiveness ofUV disinfection with low pressure UVlamps. Following this, a certifiedmethod and quality standard hasbeen developed, as described in theGerman DVGW guideline W 294 and the Austrian ÖNORM M5873-1,which specify the minimumrequirements for a UV disinfectionsystem. In a costly test procedure, UVdisinfection systems must achieve abiodosimetrically verified UV dose ofat least 400 J/m2 (at 254 nm) toobtain the DVGW, ÖVGW and SVGW(switzerland) certificates. Accordingto the latest scientific knowledge,the number of hygiene-relevant

Clean and Healthy Drinking Waterwith Ultraviolet Disinfection


Worldwide distribution of WEDECO systems

2ITT IndustriesEngineered for life

WEDECO

Multistage process of drinking water treatment (Wasserwerk Pitkäkoski / Helsinki, Finland)

WEDECO UV potable water disinfection system (Wahnbachtalsperre, Germany)

5 1

1 2 4

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6 7

SedimentationSandfiltration Ozonization

Pressureincrease

Active carbonfiltration

UVdisinfection

High pressurepumps

Raw water Sludge disposal via sewage treatment plant

7 Ammonium6 Sodiumhypochlorite

4 Aluminiumsulphate

3 Slakedlime

2 Lime1 Carbondioxide

5 Ozone


WEDECO

Reliable disinfection at 254 nm

UV is now used worldwide to disinfectpotable water. Countless water utilitiesand big cities already rely on UV todisinfect their drinking water. Pathogenicbacteria, viruses and parasites such asCryptosporidium and Giardia, areeffectively inactivated by UV light.Disinfection with UV does not lead tothe increased resistance associated withthe use of antibiotics and, increasingly,chlorination. UV disinfection is beingused successfully for groundwater,spring water, well water and surfacewater.

Inactivation of parasites

As extensive tests in Germany and theUSA have proven, UV disinfection is nowthe most effective method ofinactivating dangerous parasites(Cryptosporidia, Giardia) in drinkingwater.

X-rays

100 200 280 315 400 780

Wavelength (nm)

Vacuum-UV

UV-C UV-B

UV-A

Ultraviolet Visible light Infrared

UV Spektrothermlamp (254 nm)

Inactivation ofmicroorganisms

UV is energy-rich light with a wavelength of 100 – 400 nm. The UV-Crange from 200 – 280 nm embraces the most effective wavelengthsfor disinfection (e. g. 254 nm).

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UV light

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UV light inactivates microorganisms by changing the genetic informationin their DNA and RNA and thus preventing essential biochemical processesfrom taking place.

Comparison of the UV and chlorine disinfection methods

No chance for harmful microorganisms

Type Pathogenic Total micro- Viruses Cryptosporidia Possible harmful bakteria organisms count Giardia by-products

UV disinfection with low pressure ++ + + ++ noneChlorination + + + - THM,

AOX, chlorite

++ = very effective + = effective – = scarcely effective


WEDECO

No harmful by-products

Health authorities now recommendthe use of technologies such as UVdisinfection, which generate noharmful by-products. UV disinfectionwith low pressure Spektrotherm UVlamps (primary emission at 254 nm)impairs neither the taste nor theodour of potable water. It retains its natural quality. No harmful by-

products are formed, such as thoseassociated with chlorination (THM)and medium pressure lamps (e.g.nitrite formation, the generation ofassimilable organic carbon [AOC] and the formation of genotoxicsubstances). Nor does UV disinfectionwith Spektrotherm lamps increasethe probability of recontamination.

UV radiation is a part ofnatural sunlight

E.coli ATCC 1129E.coli ATCC 23958E.coli NCTC 5934E.coli NCIB 9481E. coli Wildisolat

Enterobacter cloacaeKlebsiella pneumoniae

Citrobacter freundiiYersinia enterocolitica

Salmonella typhiSalmonella typhimurium

Seratia marcescensEnterocolitica faecium

Vibrio cholerae WildisolatPseudomonas aeruginosa

Mycobacterium smegmatis

Cryptosporidium parvum

Polio virus (Mahoney)Rotavirus SA11

Staphyl. aureus phage A994

0 100 200 300 400 500UV dose (fluence) in Joule/m2

Photoreactivation is prevented by a UV dose (fluence) of 400 Joule/m2

Source: University of Bonn

UV radiation dose for inactivation by a factor of 104 (99.99%)


WEDECO

UV disinfection isguaranteed with WEDECO Spektrotherm® lamps

• Reliable inactivation of bacteria,viruses and parasites (e.g.Cryptosporidia and Giardia)

• No harmful by-products

• No danger from chemicals

• No accumulation of dangerousmicroorganisms

• Cost effective

• Simple installation and operation

ADVANTAGES

In use for 15 years, during which ithas been continuously improved,WEDECO’s Spektrotherm® lowpressure UV lamp is the benchmarkfor UV output and cost-efficiency. Thespecial doping of the Spektrotherm®

lamps (amalgam) and the speciallydeveloped electronic ballasts areresponsible for the excellentoperating properties of WEDECO’sUV systems.

Medium pressure lamps emit a wide-band spectrum, most ofwhich is outside the part of the spectrum that is relevant fordisinfection. In addition, the formation of by-productscannot be excluded.

Spektrotherm® Lamp

200

254 nm Spectral curve of cell inactivation

250 300 350 400 450 500 550 600

Wavelength [nm]

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Medium Pressure Lamp

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Spectral curve of cell inactivation

250 300 350 400 450 500 550 600

Wavelength [nm]

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The monochromatic Spektrotherm® lamp emits at awavelength of 254 nm, which is in the maximum of theeffective disinfection range of the spectrum.

Emission spectra

WEDECO Spektrotherm® lamps – market leaders in efficiency and reliability


WEDECO

• 5 times higher UV-C output thanconventional low pressure lamps

• 3 times more energy efficientthan medium pressure lamps

• Stable UV-C output at watertemperatures from 0°C to 60°C

• Up to 3 times longer lamp lifethan medium pressure lamps

ADVANTAGES

WEDECO Spektrotherm® lamps – the most advantageous solution incomparison with medium pressure lamps

PROPERTIES ADVANTAGES

Much more efficient in the UV-C range • Lower electricity and operating costs

Spektrotherm® lamps: ~ 40% • Fewer lamps

Medium pressure lamps: 12- 15%

Longer guaranteed operating life than • Less ageing of the lamp and longer service life medium pressure lamps reduce operating costs

Lower lamp operating temperature: • Simpler handling

Spektrotherm® lamps: 100 °C • Less susceptible to coating formation on the Medium pressure lamps: ~ 800 °C quartz sleeves

• Immediate restart is possible – medium pressure lamps must first cool for 10 minutes

• Medium pressure lamps have to be cooled during zero flow conditions (recirculation)

Emission primarily at 254 nm – no emissions of • In contrast to medium pressure lamps, short-wave UV light below 250 nm no formation of harmful by-products

• No expensive filters are needed to suppress short-wave UV light

Amount of liquid mercury: • Environmentally friendly

Spektrotherm® lamp: 0 mg • Spektrotherm® lamps are recycled Medium pressure lamp: up to 300 mg free of charge by WEDECO

Electronic ballasts ensure that theSpektrotherm® UV lamps operate cost-effectively and reliably

WEDECO stainless steel reactor withSpektrotherm® UV lamps arrangedperpendicular to the flow


WEDECO

This unique quality standard for UV systems is a global benchmark.Mathematical methods of calculatingthe UV dose are usually imprecise,as insufficiently irradiated parts ofthe UV system are not sufficientlyrecognized.

Certified to German DVGW W294 and Austrian ÖNORM M5873-1 standards

Biodosimetrically verified UV dose of 400 J/m2

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0 200 400 600 800

UV-dose at 254 nm Ws/m2

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Inactivation diagram of B. subtilis sporeswith a laboratory radiation instrument

Water inflow

Addition ofbacteria

Mixer

Sampling

UV-System

Mixer

Flowcontrol

SamplingSensor valuein W/m2

Wastewaterchannel

The UV system is then tested at fullflow with injected bacteria. If the UVsystem achieves the same level ofbacterial reduction as was measuredin the laboratory test, the UV systemhas passed the test successfully.

Full Scale Test

Certified operatingdiagram

The result of this extensive test isthe certified operating diagramwith approved flow and minimumUV sensor value.

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Minimal sensor display W/m2

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WEDECO

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Radiation test inthe laboratory

The UV system is subjected to a full-scale test to determine the real UVdose . The UV sensitivity of thebacterial strain is initially tested at400 J/m2 in a radiation test in thelaboratory.

WEDECO UV disinfection system forpotable water in Helsinki, Finland

UV monitoring device withsensor for determining themicrobicidal radiationintensity

WEDECO is the first manufacturer in the world to have its whole rangeof drinking water products biodo-simetrically certified. The K-typesystems have also been intensivelytested. Operators therefore knowthat they are getting the highestlevel of reliability.


WEDECO

The decisive advantagesfor waterworksoperators:

• Verification of the real UVdose of 400 J/m2

• Exactly dimensioned UVsystem on the basis ofcertified figures

• Standardized online UVintensity sensor

• Certified minimum UVintensity sensor value forverification of disinfectionperformance

ADVANTAGES

Mounting sleeve

Sensor


WEDECO

The WEDECO K systems can beoptionally equipped with a fullyautomatic dose control. This uniquefeature of the WEDECO technologyenables the output to be exactlyadjusted to the water quality andflow. The output of the Spektrotherm®

lamps is continuously controlled androws of lamps can be switched on oroff as necessary, e.g. during periodsof low consumption.

The radiation intensity is determinedat a representative point within theUV reactor and serves, together withthe flow signal, to regulate UVoutput.

UV dose control with the WEDECO variable system

Low flow rate + good waterquality = less intense UV radiation

High flow rate + poor waterquality = more intense UV radiation

The WEDECO variable system offers

• constant UV dose irrespectiveof changes in water quality or flow

• continuous output regulationof the Spektrotherm® lamp

• fully automatic PLC controland visualization with bus orSCADA connection

• maximum disinfectionreliability

• optimization of energy costs

• longer lamp life

• easy operation andmonitoring

ADVANTAGES

800 J/m2

600 J/m2

400 J/m2

200 J/m2

Feb. Apr. Jun. Aug. Oct. Nov.

1000 m3/Std.

2000 m3/Std.

3000 m3/Std.

4000 m3/Std.

Jan. Mar. May Jul. Sep.

UV dose (fluence)

Dec.

flow

UV dose (fluence)

flow

UV dose in practice: Constant UV dose even when the flow fluctuates.


WEDECO

Lifetime costs analysis based on 20 years, verified UV dose (fluence)with typical figures from public invitations to tender

50%

100%

WEDECO KSeries

Medium pressuresystem

Energy costsSensor calibrationCleaningQuarz sleevesLamp costsInitial equipment costs

0%

In addition to the listed technicalhighlights, the WEDECO K series alsooffers the solution with the lowestoperating and lifetime costs. With lowpower consumption, a long lamp servicelife, variable control and low investmentcosts, the K series sets new standards of cost effectiveness. Coating formationon the quartz sleeves is also moremanageable due to the low lamptemperature, so quartz sleeves rarelyneed to be cleaned. No expensive andmaintanance - intensive wiper systemsare needed.

WEDECO UV disinfection system for Clayton County, Georgia, USA

• Very low electricity costs

• Long lamp life

• Low cleaning costs

• Long service life of quartz sleeves

• Minimal pressure loss

ADVANTAGES

Low lifetime costs – the decisive advantage of the K series

ITT IndustriesEngineered for life

WEDECODIN EN ISO 9001DIN EN ISO 14001

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C O N T A C T S

Internet: www.wedecoag.com

AUSTRALIA / SOUTH-EAST ASIA

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AUSTRIA

Seyrlstrasse 2A-4863 Seewalchen am AtterseeTel.: +43 7662 5626Fax: +43 7662 5626-20E-mail: [email protected]

CHINA

1107-1108 Central PlazaNo. 227 North Huang Pi RoadShanghai, 200003ChinaTel.: +86 21 6375 8880-13Fax: +86 21 6375 9028E-mail: [email protected]

GERMANY

Boschstr. 4D-32051 HerfordTel.: +49 5221 930-0Fax: +49 5221 930-131E-mail: [email protected]

FRANCE

29-31 boulevard de la MuetteF-95145 Garges-lès-GonesseTel.: +33 01 30111450Fax: +33 01 39936133E-mail: [email protected]

GREAT BRITAIN

Churchfield RoadChilton Industrial EstateSudburyGB-Suffolk CO10 2YA Tel.: +44 1787 376259Fax: +44 1787 881452E-mail: [email protected]

Unit 7, Mercury ParkMercury WayUrmstonGB-Manchester M41 7LYTel.: +44 16 1865 5000Fax: +44 16 1865 5500

HUNGARY

P.O. Box 286H-2601 VacTel.: +36 27 3176 11Fax: +36 27 31658 0E-mail: [email protected]

ITALY

North:Via Caduti sul lavoro, 27I-20099 Sesto San Giovanni (MI)Tel: +39 02 24412969Fax : +39 02 24412969E-mail: [email protected]

South:Via Tridente, 22I-70125 BariTel.: +39 080 5910511Fax: +39 080 5910514E-mail: [email protected]

KOREA

99, Gosan-ri, Ohpo-eup,Gwangju-shi, Gyunggi-doKorea 464-891Tel.: +82 31 768 3588Fax: +82 31 768 3587E-mail: [email protected]

NETHERLANDS

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NEW ZEALAND

P. O. Box 101-303NSMCAuckland 1310 New ZealandTel.: +64 9 448 21 24Fax: +64 9 448 21 25E-mail: [email protected]

NORTH AMERICA

14125 South Bridge CircleCharlotte, North Carolina 28273 USATel.: +1 704 7167600Fax: +1 704 7167601E-mail: [email protected]

POLAND

ul. Polna 1bPL-62-025 Kostrzyn Wlkp.Tel.: +48 61 873 35 00Fax: +48 61 873 35 01E-mail: [email protected]

SPAIN

Calle Isla de la Palma 32Nave 6, Polígono Ind. NorteSan Sebastian de los ReyesE-28700 MadridTel.: +34 91 659 1800Fax: +34 91 659 1801E-mail: [email protected]

SWITZERLAND

Birkenweg 4CH-8304 WallisellenTel.: +41 (0)433557010Fax: +41 (0)433557011E-mail: [email protected]

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