Germicidal Lamp Articles on Environmental XPRT

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 ...

Sep. 1, 2010

By IWA Publishing

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 ...

Jan. 1, 2007

By Degremont Technologies - a subsidiary of Suez Environnement

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 ...

Dec. 4, 2012

By Inderscience Publishers

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 ...

Jan. 1, 2007

By Degremont Technologies - a subsidiary of Suez Environnement

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 ...

Mar. 23, 2010

By TOMI Environmental Solutions, Inc.

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 ...

Jan. 1, 2006

By SAGE Publications

Lethal light

From radio signals to gamma waves, the electromagnetic spectrum offers considerable potential to prepare and preserve food products. Knowing precisely which wavelength in the spectrum to apply to a particular need is only the first step, however: scientists and engineers also need to fabricate systems that can withstand the rigors of an industrial environment. The application of UVC, short-wave ...

Mar. 20, 2012

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 ...

Jun. 21, 2007

By Hanovia Ltd - a Halma Company

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 ...

Aug. 20, 2011

By ESCO International

A healthier air supply

A recent study carried out at an IVF Lab in the US has shown that Steril-Aire’s UVC Emitters™ used in HVAC systems can play a critical role in improving clinical outcomes Aseven and a half-year study conducted in the in vitro fertilisation cleanroom laboratory of the Lehigh Valley Hospital and Health Network in the US found that the use of ultraviolet C or “UVC” lights ...

Mar. 20, 2012

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 ...

Oct. 9, 2014

By E-CO

Emerging Trends In UV Disinfection For Water Treatment

Introduction The UV disinfection industry has experienced tremendous growth over the last 20 years. The development of new UV technologies over this period has been a perfect example of an industry investing to meet market demand – in this case demand for an effective, low cost, and environmentally friendly disinfection technology. The acceptance of UV disinfection at water plants ...

Feb. 8, 2007

By Hanovia Ltd - a Halma Company

UVC keeps indoor air, a/c coils clean at College of the Sequoias

At College of the Sequoias (COS), a California community college in Visalia, CA, indoor air quality is a high priority. “We have not had IAQ complaints, so when we discovered naturally occurring mold growth in the air conditioning coils, we decided to treat it proactively — before mold-related allergens circulated from the HVAC systems into the occupied space,” stated Eric ...

Mar. 20, 2012

The Benefits Of UV Disinfection In The Pharmaceutical Industry

The quality standards required for purified water in the production of pharmaceuticals have never been stricter, with manufacturers having to conform to an ever increasing number of international standards. Craig Howarth, Managing Director of Hanovia Limited, introduces a number of interesting new developments in UV technology for disinfection and dechlorination. ...

Feb. 8, 2007

By Hanovia Ltd - a Halma Company

UVC approach stops mold, enhances IAQ for medical firm

Though mold problems in buildings are often associated with humid, tropical climates, mold can occur virtually anywhere — even in our most northern states. At Medicine Lake Properties, a commercial building in Plymouth, MN, mold-related IAQ issues were causing problems in one of the office suites. The 3,500-sq-ft suite is leased to a medical company that uses the space for administrative ...

Mar. 20, 2012

Case study - SOFI

Liquid Sugar Disinfection atg UV Technology, market leaders in the Ultraviolet treatment industry have supplied SOFI, atg UV’s French distributors with three state-of-the-art, ultra compact SS-73-4 Ultraviolet disinfection systems for the treatment of sugar syrup solutions. The systems where supplied to a market leading Algerian food and beverage manufacture who required ...

May 20, 2014

By atg UV Technology

Types of UV Light for Different Applications

Types of UV Light for Different Applications Ultraviolet (UV) radiation was discovered in 1801 when the German physicist Johann Wilhelm Ritter observed that invisible rays just beyond the violet end of the visible spectrum darkened silver chloride-soaked paper more quickly than violet light itself. He called them "oxidizing rays" to emphasize chemical reactivity and to ...

Jun. 7, 2017

By Larson Electronics LLC

Explosion Proof UV Lights for Commercial and Industrial HVAC systems

In the past decade, more and more people have been installing UV lights in their HVAC systems to eradicate harmful bacteria. A timely study from Duke University Medical Center has proven the effectiveness of using UVC bands to disinfect a myriad of dangerous microbes, including drug-resistant bacteria, such as Acinetobacter, Clostridium difficile and vancomycin-resistant enterococci (VRE). During ...

Jan. 20, 2017

By Larson Electronics LLC

Application of LEDs in Wastewater Treatment Plants

Wastewater treatment plants are prone to explosive risks due to the presence of volatile, flammable compounds inside the building. The Occupational Safety and Health Administration (OSHA) has highlighted the dangers of such hazardous environments through a federal safety investigation of a Canastota wastewater plant. In 2014, a worker died from third-degree burns after a devastating ...

Feb. 28, 2017

By Larson Electronics LLC

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