Showing results for: ultraviolet lamp Articles
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How to clean your UV lamp
Cleaning Your UV Lamps and System It is extremely important to maintain your UV lamps and system to avoid problems which could prevent your UV lamp from curing. Firstly when handling a UV lamp we strongly recommend that you wear gloves, this will prevent contaminants such as fingerprints from sticking to the surface of the quartz body. To clean the lamp you can use a lint free cloth with either ...
By Alpha-Purify
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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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The microwave-assisted photo-catalytic degradation of organic dyes
In this study, TiO2 photo-catalyst balls produced by the chemical vapour deposition method were used for degradation of organic dyes in which simultaneous irradiation of microwave and UV was evaluated. An electrodeless UV lamp that emits UV upon the irradiation of microwave was developed to irradiate microwave and UV simultaneously. The degradation reaction rate was shown to be higher with higher ...
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Determination of pyrimidine dimers in the genomic DNA of Escherichia coli during photoreactivation following inactivation by medium-pressure UV lamp
A polychromatic medium-pressure (MP) UV lamp was compared with a monochromatic low-pressure (LP) UV lamp to investigate the inactivation and the subsequent photoreactivation of Escherichia coli . An endonuclease sensitive site (ESS) assay was applied to determine the number of UV-induced pyrimidine dimers in the genomic DNA of E.coli in parallel with a conventional colony forming assay. more than ...
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A method for determining the optimal discretization of UV lamps for emission-based fluence rate models
A method for optimizing the number of segment sources needed to discretize UV lamps for fluence rate modeling and dose calculations when using the multiple segment source summation (MSSS) fluence rate model (FRM) is presented. An ideal location for determining the optimal number of point or segment sources was found using the multiple point source summation (MPSS) method with no reflection and ...
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Toilet-to-Tap; A Growing Necessity
Reusing final effluent wastewater for applications such as irrigation of crops and even potable drinking water is now becoming a necessity for many water stressed locations around the world. atg UV Technology have invested in validating 9 multi lamp, ultra-high output low pressure amalgam UV Systems for water reuse. Using the NWRI Water Reuse validation protocols, the world’s first ...
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Potential Repair of Escherichia coli DNA following Exposure to UV Radiation from Both Medium- and Low-Pressure UV Sources Used in Drinking Water Treatment
The increased use of UV radiation as a drinking water treatment technology has instigated studies of the repair potential of microorganisms following treatment. This study challenged the repair potential of an optimally grown nonpathogenic laboratory strain of Escherichia coli after UV radiation from low- and mediumpressure lamps. Samples were irradiated with doses of 5, 8, and 10 mJ/cm2 from a ...
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Comparison of Low and Medium Pressure UV
DESTRUCTION OF PATHOGENS (Bacteria, Viruses, Protozoan Cysts): Both Conventional (low pressure) and Medium pressure UV will assist chlorine in disinfection including the destruction of all bacteria, viruses and protozoan cysts on a single pass. DESTRUCTION OF CHLORAMINES: Monochloramine (NH2Cl), Dichloramine (NHCl2), and Nitrogen Trichloride (NCl3) are the products of nitrogen introduction ...
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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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Effects of natural organic matter and nitrate on the behavior of nitrosodimethylamine during ultraviolet irradiation and chloramination
Nitrosodimethylamine (NDMA), a potent carcinogen, is found in natural and engineered water systems. Ultraviolet (UV) treatment is potentially a useful tool for controlling NDMA at water purification plants. However, a recent study has reported that UV/advanced oxidation process (AOP) treatment may provide a source of NDMA precursors. Therefore, we investigated the effect of UV treatment on the ...
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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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Photocatalytic degradation of aniline in water using CuO nanoparticles
The removal of aniline as a carcinogen from aqueous environments is highly significant. In the present study, the feasibility of photocatalytic degradation of aniline by CuO nanoparticles was evaluated. A batch reactor with an internal UV lamp was used and the effects of the parameters of pH (3–11), dosage of catalyst (0.01–0.1 g/L), initial concentration of aniline (50–250 mg/L), and ...
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Optimization of lamp arrangement in a closed-conduit UV reactor based on a genetic algorithm
The choice for the arrangement of the UV lamps in a closed-conduit ultraviolet (CCUV) reactor significantly affects the performance. However, a systematic methodology for the optimal lamp arrangement within the chamber of the CCUV reactor is not well established in the literature. In this research work, we propose a viable systematic methodology for the lamp arrangement based on a genetic ...
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Preparation of Fe3O4/TiO2 magnetic mesoporous composites for photocatalytic degradation of organic pollutants
Fe3O4/TiO2 magnetic mesoporous composites were synthesized through a sol-gel method with tetra-n-butyl titanate as precursor and surfactant P123 as template. The as-prepared Fe3O4/TiO2 composites were characterized by X-ray diffraction, diffuse reflectance spectroscopy, nitrogen adsorption-desorption isotherm and pore size distribution. The as-synthesized products were applied as ...
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Reduction of
Escherichia coli bacteria from contaminated water by combining hydrogen peroxide, ozone and ultraviolet lightThis study demonstrates the reduction of Escherichia coli bacteria from contaminated water when the water is treated with advanced oxidation processes utilising the following combinations: hydrogen peroxide (H2O2) and ozone (O3), ultraviolet light (UV) and hydrogen peroxide (H2O2), and ultraviolet light (UV) and ozone (O3). Approximately 1 × 108cell/mL of E. coli were spiked into water ...
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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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Photoeletrolytic system applied to remazol red brilliant degradation
Toxicity tests using Sacharomycces cerevisiae were made with simulated textile effluents containing reactive dye (remazol red brilliant) treated by photoeletrolytic process, varying treatment time and applied current. The treatment incorporated an electrolytic reactor with rectangular titanium anode coated with 70% TiO2/30% RuO2 cathode and a rectangular stainless steel coupled with another ...
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Comparison of continuous versus pulsed ultraviolet light emitting diode use for the inactivation of
Bacillus globigii sporesLight emitting diodes (LEDs) in the ultraviolet (UV) range offer a promising alternative for the disinfection of water. LEDs have many advantages over conventional UV lamps but there are concerns related to the operating life of the LED lamps. In this project Bacillus globigii was inactivated using UV LED technology. The experimental strategy included using pulsed ultraviolet (PUV) output ...
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Prediction of the effects of vortex shedding on UV disinfection efficiency
An assessment is made of the importance of vortex shedding which occurs from UV lamps on the efficacy of disinfection in UV channels. The focus is on the high Reynolds-number regime where turbulent flow conditions prevail and where there exists a strong interaction between the periodic mean-flow unsteadiness and the random turbulent motions. Simulations are performed of the flow around four ...
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Computational modeling of ultraviolet disinfection
The efficient design of ultraviolet light (UV) systems for water and wastewater treatment requires detailed knowledge of the patterns of fluid motion that occur in the disinfection channel. This knowledge is increasingly being obtained using Computational Fluid Dynamics (CFD) software packages that solve the equations governing turbulent fluid-flow motion. In this work, we present predictions of ...
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