mercury lamp Articles
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Rapid Start Lamps Vs Mercury Arc Lamp
We have recently had a little bit of confusion between our Rapid Start lamps and our Mercury Arc Lamps and their differing warranties. So to clear up some of your concerns our Production Director Richard Cherry explains how they differ: “It is true, a Rapid Start Lamp is just another version of a Mercury Arc Lamp. However, we add a different fill gas to speed the run up of the lamp from ...
By Alpha-Purify
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Ultraviolet irradiation combined with manganese ore catalyzed ozonation of 4-chlorophenol in aqueous solution
We have investigated ultraviolet (UV) irradiation combined with manganese ore (MO) catalyzed ozonation of 4-cholorophenol (4-CP) in aqueous solution. The preliminary results showed UV irradiation and MO had a strong synergetic catalytic effect on ozonation. We also studied the effect of UV lamp power, MO dosage, O3 dosage, initial 4-CP concentration, pH value and temperature. The results showed ...
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Comparison of the photoconversion of para-chlorophenol under simulated sunlight and UV irradiation in ice
The photochemistry of para-chlorophenol (4-CP) was studied under simulated sunlight (λ > 300 nm) and UV irradiation by using a 125 W high-pressure mercury lamp with or without a hard glass as light source in an ice matrix. The experiments were carried out in a photochemical cold chamber reactor at −14 to −12 °C. The photoconversion rate, photoproducts and photoconversion mechanism of 4-CP were ...
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Mercury – The Facts, Myths and Clean Up Tips!
Mercury, the facts. Mercury is an element (Hg on the periodic table) found naturally in the environment. Mercury emissions can come from both natural and man-made sources. It is commonly used in mercury arc lamps for UV curing, however this is a very minimal amount (as little as 5mg) and is used in the lamp to increase the voltage. Due to the harmful effects of Mercury, many ‘Mercury ...
By Alpha-Purify
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Efficacy of vacuum ultraviolet photolysis for bromate and chlorate removal
We introduce vacuum ultraviolet (VUV) photolysis at 172 nm as a more efficient process for bromate and chlorate removal than conventional ultraviolet (UV) photolysis at 254 nm. We discuss the effects of pH and coexisting salts on VUV photolysis. In experiments at various pH levels, the VUV photolysis performance decreased in the alkaline region for pH above 7. Furthermore, nitrate and inorganic ...
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Mercury Emissions From The Disposal of Fluorescent Lamps
The Environmental Protection Agency (EPA) is making available to the public a study containing information relating to its Proposed Rule addressing the management of mercury-containing lamps under the Resource Conservation and Recovery Act Subtitle C hazardous waste management system published in the Federal Register on July 27, 1994, 59 FR 39288. The study consists of an electronic model and ...
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University of North Carolina - Case Study
The University of North Carolina uses a Peak Scientific Genius 1053 to provide a consistent flow of nitrogen for their photolithography and microtechnology applications as opposed to liquid dewars, their previous nitrogen source. Name: Bob Geil Job Title: Laboratory Manager Company: University of North Carolina Country: USA Genius 1053 What Peak Scientific generators do you have in your ...
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How LEDs Will Change Water Purification
Ultraviolet (UV) light has been naturally purifying water for centuries. With clear skies, our sun can inactivate water-based pathogens in six hours minimum. Cloudy skies or unclear water causes imperfect conditions. These conditions allow for bacteria to grow and make natural water sources unsafe to use. Fortunately, we have developed several types of water disinfection, ranging from chemicals ...
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Demonstration and evaluation of germicidal UV-LEDs for point-of-use water disinfection
Ultraviolet (UV) irradiation is a common disinfection option for water treatment in the developed world. There are a few systems installed in developing countries for point-of-use treatment, but the low-pressure mercury lamps currently used as the UV irradiation source have a number of sustainability issues including a fragile envelope, a lifetime of approximately one year, and they contain ...
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UV disinfection of stabilization pond effluent: a feasible alternative for areas with land restriction
The purpose of this research was to determine the feasibility of a UV photoreactor for the disinfection of effluent from a polishing pond following a UASB reactor treating domestic wastewater. For this, a 20 mm diameter photoreactor (20.7 litre volume) equipped with four 30 W submerged low-pressure mercury arc lamps was used. Three tests with contact times and doses ranging from 45 to 90 s and ...
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Aging evaluation of medium-pressure mercury lamps under typical operating conditions for drinking water disinfection applications
Little is known regarding how medium pressure (MP) ultraviolet (UV) lamps age under typical operating conditions, yet a number of assumptions regarding lamp aging are utilized when UV reactors are validated, often as unfounded approximations. This study was designed to evaluate the aging of MP UV lamps utilized with a closed-vessel UV reactor technology for drinking water disinfection ...
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Impact of natural organic matter on bromate removal in the sulfite/UV-L advanced reduction process
Advanced reduction processes (ARPs) are treatment processes that involve combining reducing reagents and activating tools to produce highly reactive reducing free radicals. The process has proven effective for treating oxidized contaminants, and the effects of process variables on the degradation kinetics of various target contaminants have been investigated in our previous studies. In ...
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Effects of UVGI filtration on indoor air contaminants and HVAC systems
Proprietary High Intensity UVC (Germicidal 254 nm) Mercury Vapor Quartz Lamps designed to prevent and destroy mold and other microbial growth on the A/C coil and eliminate biological contaminants and chemicals in the air. Ultraviolet light destroy biological & chemical contaminants TOMIES proprietary High-Intensity Mercury Vapor Quartz Lamps produce UVC and UVV (both wavelengths are fused ...
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RoHS Directive: Industry Group Challenges Exemption Recommendations
A group of industry associations has told the European Union Commission it does not agree with recommendations on how to handle Pack 9 exemptions under the Restriction of Hazardous Substances (RoHS) Directive. The Cross-Industry Project, also known as the Umbrella Project, includes over 34 industry associations around the world. The group submitted their feedback in July 2016, shortly after the ...
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Characterisation of waste fluorescent lamps to investigate their potential recovery in Turkey
The investigations in this study were performed on two types of waste linear (tubular) T8 and T12 lamps, which are mostly used in Turkey. Total average value of the mercury mass for the T8 and T12 lamps were calculated to be about 6 mg and 12 mg per lamp, respectively. SEM–EDX elemental analysis showed that approximately 52% of hosphor powders of waste T8 and T12 lamps was measured as calcium ...
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Mercury Ban – Printers Unaffected
The mercury ban debate has been rife with speculation, confusion, strong accusations and well, a little bit of misleading information. So, together with Brendan Perring of Print Monthly I have been getting to the bottom of this tangled web of information. We have been in contact with the National Measurement and Regulations Office (NMRO) to seek clarification, and today I found myself meeting a ...
By Alpha-Purify
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5 Colors Paper Cup Flexographic Printing Machine
This 5 colors label, paper cup flexo printing machine is suitable for printing paper, paperboard, high-grade self-adhesive label and so on. It is an auxiliary equipment of multi-color printing machine. At first glazing, it can increase the brightness of the product and the storage time of the product color. This printing machine can improve the quality of products and adopt the import stepless ...
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UV-C Technology and Disinfection
UV-C light is a reliable and effective way to inactivate bacteria, viruses and other harmful microorganisms. Its germicidal properties have been known for over 100 years, but this is the first time it’s been built into a wearable air purifier. In recent years, there have been significant technological advancements in UV-C LEDs (265nm). LEDs are now low maintenance, reliable and non-ozone ...
By Respiray OU
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The Cryptosporidium Water Crisis
One major event to strike the water industry recently, was the Lancashire Cryptosporidium water crisis. Cryptosporidium is a parasite found in livestock, which can have some severe consequences on the gastrointestinal system when ingested. Lancashire has seen 300,000 households suffer from a water contamination incident that’s forced residents to buy bottled water for weeks. Now residents ...
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Effects of operation conditions on removal rate constant and quantum yield of gaseous chlorobenzene degradation in a photochemical reactor
A photochemical reactor with a low-pressure mercury ultraviolet (UV) lamp was established to treat waste gas containing chlorobenzene. Operation conditions such as light intensity, gas humidity, and inlet chlorobenzene concentration were varied. Two significant parameters, the removal rate constant and the quantum yield (relating to removal kinetic and light energy utilization), were investigated ...
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