germicidal Articles
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Spectral distribution of uv light during aging of medium pressure UV lamps
As part of a project to validate a UV reactor for disinfection of drinking water, the germicidal output of four medium pressure lamps housed in a continuously operating reactor was followed as a function of time. Spectra were measured monthly and were used in conjunction with radiometer readings to calculate germicidal fluence rates (using DNA absorbance weighting) at the radiometer sensor ...
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Microbial reduction efficiencies of filtration, electrostatic polarization, and UV components of a Germicidal Air Cleaning System
Abstract: This study determined the effectiveness of components of a germicidal air-cleaning system involving filtration, electrostatic polarization, and UV light on the reduction of airborne bacteria and molds. The filter alone, filter and electrostatic polarization combined, and the filter, electrostatic polarization, and UV light were found to be effective (P < 0.05) in reducing a given ...
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Polaris Scientific UV Series Now UVA Series ; Product Line Modification Bulletin
Polaris Scientific is proud to announce that our UV Series line of sterilization systems is now in the process of being replaced by our new UVA Series line which has the added benet of Polaris Scientics New Patented 4 Pin Germicidal Lamp design. The new patented staggered 4 Pin design will be exclusive to Polaris UV customers and will not be available elsewhere. This new lamp pin configuration ...
By WECO Filters
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Comparison of ultraviolet light emitting diodes with traditional UV for greywater disinfection
The current technological status of ultraviolet light emitting diodes (UV-LEDs) has reached a point where small-scale ultraviolet (UV) water disinfection applications, that is, for greywater reuse appear increasingly promising. This study compares the germicidal and economical aspects of UV-LEDs with traditional UV. Pure cultures and environmental greywater samples were exposed to different ...
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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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Computational fluid dynamics modelling of UR–UVGI lamp effectiveness to promote disinfection of airborne microorganisms
This paper focuses on using computational fluid dynamics (CFD) modelling methods to study the effectiveness of upper–room ultraviolet germicidal irradiation (UR–UVGI) lamps in healthcare facilities. This work develops and uses simplifications for boundary conditions in CFD, while details of UR–UVGI lamps and microorganism characteristics were obtained from existing experimental ...
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Use of CFD Modelling to Optimise the Design of Upper-room UVGI Disinfection Systems for Ventilated Rooms
AbstractThe installation of upper-room ultraviolet germicidal irradiation (UVGI) devices in ventilated rooms has the potential to reduce transmission of infections by an airborne route. However, the performance of such devices is dependant on several factors including the location of the lamp and the ventilation airflow in the room. This study uses a CFD model to evaluate the performance of UVGI ...
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Analysis of efficacy of UVGI Inactivation of Airborne Organisms Using Eulerian and Lagrangian approaches
Abstract Ultraviolet germicidal irradiation (UVGI) is increasingly used in health care facilities to kill airborne bacteria and control the spread of airborne infection among occupants. The most widely used form of UVGI is the passive upper-room lamps that generate a horizontal layer irradiance field above the occupied zone. In this study, the efficacy of killing airborne bacteria by upper-room ...
By E-CO
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The Application of Ultraviolet Germicidal Irradiation to Control Transmission of Airborne Disease: Bioterrorism Countermeasure
Synopsis Bioterrorism is an area of increasing public health concern. The intent of this article is to review the air cleansing technologies available to protect building occupants from the intentional release of bioterror agents into congregate spaces (such as offices, schools, auditoriums, and transportation centers), as well as through outside air intakes and by way of recirculation air ducts. ...
By E-CO
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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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CASE STUDY - Surfactant Enchanced HVDPE Remediation of Petroleum Contaminated Soil, Bedrock and Groundwater
Anionic: Have one or more negatively (-) charged groupings; commonly used in laundry detergent Cationic: Have one or more positively (+) charged groupings, typically poor detergents but well suited for use as germicides, fabric softeners and emulsifiers. Amphoteric: Contain both anionic and cationic groupings; prefer neutral pH and found in products such as hair shampoo, skin cleaners and ...
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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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Common Types of UV lamps for Ultraviolet Disinfection (UV Lamps) for Chemical Free Water Disinfection
Types of Ultraviolet Disinfection (UV) Lamps for Chemical Free Water & Wastewater Treatment When it comes to water and wastewater treatment systems, operational and performance variation will come from different components. This variance can come from the differences treatment processes deployed, whether chemicals are utilized or how much power the treatment processes require. With many ...
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UV Photolysis of Nitrate: Effects of Natural Organic Matter and Dissolved Inorganic Carbon and Implications for UV Water Disinfection
Nitrite (NO2-) formation during ultraviolet (UV) photolysis of nitrate was studied as a function of pH and natural organic matter (NOM) concentration to determine water-quality effects on quantum yields and overall formation potential during UV disinfection of drinking water with polychromatic, medium-pressure (MP) Hg lamps. Quantum yields measured at 228 nm are approximately 2 times higher than ...
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Common Types of UV Lamps for Ultraviolet Disinfection of Water & Wastewater
When it comes to water and wastewater treatment systems, operational and performance variation will come from different components. This variance can come from the differences treatment processes deployed, whether chemicals are utilized or how much power the treatment processes require. With many treatment systems, there is much consideration given to a particular central component akin to the ...
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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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How do utilities save energy? - With `UVC for HVAC`!
A big challenge facing service technicians is how to help building owners reduce energy consumption to combat outages and spiraling power costs. A multi- patented, HVAC-style UVC technology from Steril-Aire, Inc. offers a proven solution while simultaneously addressing another "hot" maintenance topic: how to destroy one of the largest, most prevalent sources of mold. Two major utilities offer ...
By E-CO
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Medanta transforms its Gurgaon facility into a ‘Virus-free’ space with MUVGI technology - Case Study
Problem: With the rising number of COVID-19 cases, Medanta was facing the risk of airborne transmission of COVID-19 and other Hospital Acquired Infections inside the hospital premises, for not just patients, but also doctors, visitors, and support staff. The hospital administrators were aware of the fact that they needed to upgrade their air defense to stop the airborne transmission of ...
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UVC lights keep hospital cool, efficient - Rio Grande regional hospital projects annual energy savings of $500,000
The rapidly rising cost of air conditioning energy is a problem for hospitals everywhere, and McAllen, Texas, is no exception. In a town where over 90˚F days are common yearround, and the mercury can top the 100˚ mark even in winter, the seasons might be described as “hot and hotter.” But at McAllen’s Rio Grande Regional Hospital, administrators are staying cool with ...
By E-CO
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UV technology - unique in water disinfection
Due to its undisputable Success & Efficiency in destroying Cryptosporidium and Combined Chlorine, The Centers for Disease Control and Prevention Recommend installing UV Systems It has taken many years of testing to convince the pool market that the most reliable and best available option for treating and disinfecting water is through using Ultraviolet (UV) technology. UV systems have ...
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