However, few studies have investigated the behavior of microorganisms in wastewater. Ultraviolet uv radiation occupies the portion of electromagnetic spectrum from 100 to 400 nanometers nm. The uv lamps are suitable for most applications in air and water. These ballasts, or power supplies designed to drive gaseous discharge lamps, power medium pressure uv lamps with a medium frequency, 400hz square wave to assure stable, acoustic resonance free lamp operation. Low pressure mercury lamps lp hg lamp provide highly efficient source of ultraviolet energy, particularly short wavelength uv light 254nm and 185nm. No parts of this operating manual may be reproduced in any form without. Ushios low pressure amalgam lamps are designed with a special coating for longer life. Differences between low pressure and medium pressure lamps are outlined and main application fields of the various lamp types are discussed. Medium pressure lamps produce the greatest uv output per unit length of lamp of the 3 lamp types. Linear u form spiral other forms available upon request. Low pressure, amalgam lamp, or medium pressure whats the difference. Two other important reasons to use mediumpressure uv lamp technology is. High power electronic ballasts for medium pressure uv.
Uva 315400 nm uvb 280315 nm uvc 100280 nm for most people, the main source of uv exposure is the sun. Medium pressure uv lamps from heraeus noblelight dq lamps. Company confidential gas discharge lamp basics 3 low pressure fluorescent lamp current flows through plasma between electrodes must be ac or mercury migrates to one end plasma emits mostly uv radiation uv excites coating to fluoresce and produce visible light heated electrodes improve lamp life and lower strike voltage argon and mercury vapor. Their strong uv radiation flux results in high penetration. Typical spectrum of a uv medium pressure lamp, type hg for disinfection application the above spectrum is well. Uv medium pressure lamps iron doped the metal halide uv medium pressure iron doped lamps emit uv radiation with peak emission in the uva range at 366 nm and 440 nm. Sizing of a system should be based on bioassay validation field testing to ensure proper disinfection. Medium pressure uv lamps have a significantly higher lamp power rating which can reach up to 20 kw per lamp. This radiation is very close to the peak of the germicidal effectiveness curve of. Uv radiation is a safe, chemicalfree and reliable method of disinfection in modern water treatment. Medium pressure uv systems ultraaqua uv disinfection. An introduction to uv disinfection for municipal wastewater.
Hach replacement uv for toc analyzers, arc imaging, chromatography, photochemistry, calibration of uv detectors, calibrations of spectrophotometer, and more. Comparison of low pressure and medium pressure uv lamps. Medium pressure lamps emit every wavelength from 200. Even though more cleaning may be required for medium and amalgam lampbased systems, because they have a smaller number of lamps in the uv unit, these systems can. The mercury medium pressure uv lamps from helios quartz are appreciated. Use of ultraviolet uv lamps and lamp systems to disinfect surfaces, room air, and airstreams dates to ab out 1900. Mediumpressure lamps are more similar to hid lamps than fluorescent lamps. We adapt our uv lamps exactly to the needs of our customers, whether standard lowpressure lamps, highoutput lamps or amalgam lamps. Now, our more efficient low pressure uv lamps although more efficient, run on around the same power as a regular light bulb around 20 100w making their useful uvc output for a 40w lamp around 24w, a difference of 976w between the w from the medium pressure lamp and this one. Ushio germicidal lamps are lowpressure mercuryarc lamps that emit radiation peaking at 253. Arc lamp life is significantly reduced if the lamp is not kept. They are widely used in industrial water treatment, because they are very intense radiation sources.
The intensity of the radiation emitted by the lamp dissipates as the. A wide variety of medium pressure uv lamp options are. Even though more cleaning may be required for medium and amalgam lamp based systems, due to the reduced number of. Lowpressure lamps operate with mercury vapor pressure ranging from about 100 to pa.
Lamp type low pressure lolo low pressure lohi medium pressure power consumption 40 to 80 w 250 to 315 w 3000 to 9000 w uvc output 15 to 35 w 100 to 150 w 300 to 900 w uvc output efficiency 38% 41 to 48 % 1015% output adjustment 100% 50100% 30100% operating otemp. Medium pressure lamps are generally used for large facilities. The benefits of nedap lamp drivers reliability, high efficiency, and high power factor, in combination with stepless dimming, are the major factors that will help you to choose for the nedap state of the art technology. Mpuv lamps are primarily used in the waste water disinfection industry and in marine ballast water treatment systems. These lamps radiate a broadband uvc radiation, rather than a single line.
Uv medium pressure lamps lead doped the metal halide uv medium pressure lead doped lamps emit uv radiation with peak emission in the uva range at 357 nm and 420 nm. Medium pressure uv lamps, spectral lines from 200nm to 600nm, high radiation output in the uvc spectrum. Medium pressure uv lamps have a broad band emission in the uv and visible light spectral range. It has been reported that mediumpressure mp ultraviolet uv lamps have an advantage over lowpressure lp lamps for water disinfection in terms of the photoreactivation of pure cultured bacteria. Trojanuv solo lamp technology brochure trojanuv resources. Several studies have focused on the degradation of a wide range of pollutants, but regarding the comparison of lowpressure mercury lamps lp with mediumpressure mercury lamps mp with respect to energy consumption by the uvh2o2 process, little is known so far. How to properly specify a uv system for disinfecting water. Medium pressure lamps produce the greatest uv output per unit length of lamp, of the three lamp types. Helios can produce medium pressure uv lamps suitable for almost all uv systems. The low pressure lamps are most effective, because they emit most of the radiant energy in the germicidal wavelength at 253. Allows the comparison of low and medium pressure uv lamps under similar conditions a bioassay insures that the uv dose claimed by the manufacturer is actually delivered by the uv equipment. Manual cleaning of these systems is very labor intensive.
The revolutionary trojanuv solo lamp combines the best features of both lowpressure and mediumpressure lamps. Uv electrics ls series is the most comprehesive high power electronic ballast product lineup offered today on the market. A rayox 1kw mediumpressure mercury lamp emitting uv light over a broad range of wavelengths from approximately 185 to 1,400 nm was housed above a 93cmlong polyvinyl chloride collimating tube. The relative spectral emittance of a mediumpressure uv lamp in the wavelength range from 200 to 400 nm is shown in.
Uvh2o2 advanced oxidation is an effective barrier against organic micro pollutants. Uvtechnik speziallampen gmbh has been developing, manufacturing and marketing uvc lowpressure lamps for more than 25 years. The decrease in uv lamp output over the typical lifespan of 9,000. Uv medium pressure lamps emit a socalled discontinuous spectrum or line spectrum graphic 4 during operation. Endotoxin inactivation in water by using mediumpressure. To summarize, medium pressure lamps have clear disinfection advantage over low pressure lamps, achieving higher and more sustainable disinfection levels as. This enables high electrical efficiency and reduced lamp count. The term pressure is referred to the mercury pressure present in the lamps.
Low pressure lamps use nominal energy to obtain exactly one wavelength within the uvc range. Early work established that the most effective uv wavelength range for inactivation of microorganism s was between 220 to 300 nm, with. A larger portion of the ultraviolet light that mediumpressure lamps emit is absorbed by the dna of microorganisms, which results in effective disinfection with fewer lamps. Lamp spectra are tuned by changing the lamp chemistry to meet specificapplication needs. Thats why its critical that uv systems be designed with enough uv dose to ensure cellular damage cannot be repaired. These type of lamps have an operating life of up to 16,000 hours. Comparison of low and mediumpressure ultraviolet lamps. Uv lamps can be the phosphor type that produce lw370 peak at about 368 nm, lw350 peak at about 352 nm, or mw peak at about 312 nm. New high power amalgam lamps are significantly more powerful than low pressure lamps. This allows lamp efficiency to be optimised for disinfection, oxidation or photochemistry. A rayox 1kw medium pressure mercury lamp emitting uv light over a broad range of wavelengths from approximately 185 to 1,400 nm was housed above a 93cmlong polyvinyl chloride collimating tube. Low pressure mercury lamps have been manufactured in jelight company inc. Lamp life is governed by the life of the electrodes and is affected by the frequency of starting.
These uv lamps, emit across the entire spectrum of ultraviolet light uva, uvb and uvc with peak. Uv light is artificially produced by mercury vapor low and medium pressure lamps. Our uv systems use lowpressure, mercuryarc germicidal lamps which are designed to produce the highest amounts of uv radiation where 90% of energy is typically generated at 254nm. An electrode type medium pressure lamp consists of three major components. Operating manual uv medium pressure lamps uvtechnik. Low pressure mercury lamps specialty uv bulbs, meters. In such a spectrum, there are separate discrete points of increased intensity, socalled spectral lines. This allows for high quality, cost efficient solutions for a variety of applications. The relative spectral emittance of a mediumpressure uv lamp in the wavelength range from 200 to 400 nm is shown in fig. The solo lamp is available in either 500 or watts the most powerful amalgam lamp in. Basics of uv disinfection michigan water environment. Uv radiation is either a low or a mediumpressure mercury arc lamp with low or high intensity.
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