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  • Keyword = 'Ultraviolet light'.
Records 1 to 25 of 131

Innovative UV-C LED Water Treatment Applications
(PUBLISHED REPORT) [Published : Oct 31, 2023]
The project team evaluated the device at multiple wavelengths to assess optimal performance under specific conditions for select contaminants and a suite of contaminants.  This collaboration focused on the following:  - Reactor optimization and flow scale-up,  - Mo...
Waterborne pathogen inactivation at a point-of-use device: A proof-of-concept study using a UV-LEDs integrated showerhead
(PRESENTATION) [Presented : Nov 09, 2023]
This presentation describes a proof-of-concept study designed for a novel point-of-use (POU) device integrated with ultraviolet-light emitting diodes (UV-LEDs). The study mainly focuses on how the integration works effectively for water disinfection in home plumbing systems. We f...
Application of UV-LEDs and UV reflective material for water disinfection
(PRESENTATION) [Presented : Sep 28, 2022]
In this study, we investigate the effect of UV reflective materials on microbial inactivation efficiency in drinking water using this side-mounted UV-LED tubular device. Specifically, the effects of length of reflective material, reflectivity of the material, and the flow rate of...
Evaluating the inactivation efficiency of an ultraviolet light emitting diodes point-of-use (UV-LED POU) device for drinking water disinfection
(PAPER IN NON-EPA PROCEEDINGS) [Published : Oct 01, 2022]
The use of ultraviolet (UV) lamps in water treatment is a promising alternative to conventional water disinfection techniques (e.g., chlorination and ozonation). UV disinfection inactivates a broad range of microorganisms without chemicals, thereby eliminating the problem of disi...
Modeling the Fate and Transport of Two Nanometal Oxides in Multiple Aquatic Systems
(PRESENTATION) [Presented : Dec 16, 2022]
            Engineered nanomaterials (ENMs) have emerged as their own unique class of contaminants to the environment, due to their increased use and production over the past several decades.  ENMs vary in their composit...
(PRESENTATION) [Presented : Nov 18, 2021]
As concern about the impact of conventional, petroleum-based plastics grows, bioplastics (BP) and degradable plastics (DPs) have emerged as potential sustainable alternatives.  But the fate of BPs and DPs in the environment it remains unclear and some may breakdown into nano...
Inactivation of Bacillus anthracis Spores on Surfaces with Ultraviolet Light Produced with a Low- Pressure Mercury Lamp or Light Emitting Diodes
(PRESENTATION) [Presented : Nov 05, 2021]
Aims: To obtain quantitative efficacy data of two ultraviolet light (UVC) technologies for surface inactivation of Bacillus anthracis Ames and Bacillus atrophaeus spores. Methods and Results: Spores were deposited onto test coupons and controls of four different materials, via l...
Inactivation of Bacillus anthracis and Bacillus atrophaeus Spores on Surfaces with Ultraviolet Light Produced Via Either Light Emitting Diodes or a Low-Pressure Mercury Vapor Lamp
(JOURNAL) [Published : Nov 01, 2021]
Journal article; Aims: To obtain data on the efficacy of two ultraviolet light (UVC) technologies for inactivation of Bacillus anthracis Ames and Bacillus atrophaeus spores on surfaces.
Dermal Toxicity
(BOOK CHAPTER) [Published : Feb 21, 2020]
The skin is an essential organ because it protects the internal organs from the outside environment, maintains body water, regulates temperature, and provides overall support to the body. The skin has two main elements, the outer epidermis and the underlying dermis. The cells of ...
Impacts on human health of sunscreen active ingredients used to filter ultraviolet light
(PRESENTATION) [Presented : Mar 19, 2020]
There are several known adverse health effects in the skin following overexposure to ultraviolet (UV) light from the sun. Acute effects from UV light overexposure include erythema, immunosuppression and burns; chronic effects include photoaging and cancer. Occurrence of skin canc...
Release and transformation of nanoparticle additives from surface coatings on pristine & weathered pressure treated lumber
(JOURNAL) [Published : Oct 01, 2020]
As the market for “nano-enabled” products (NEPs) continues to expand in commercial and industrial applications, there is a critical need to understand conditions that promote release of nanomaterials and their degradation products from NEPs. Moreover, these studies must aim to qu...
Inactivation of Bacillus anthracis Spores on Surfaces with Ultraviolet Light Produced with a Low Pressure Mercury Lamp or Light Emitting Diodes
(PRESENTATION) [Presented : Dec 12, 2019]
This Presentation Aims: To obtain quantitative efficacy data of two ultraviolet light (UVC) technologies for surface inactivation of Bacillus anthracis Ames and Bacillus atrophaeus spores.
Persistence and Decay of Fecal Microbiota in Aquatic Habitats
(JOURNAL) [Published : Nov 20, 2019]
Fecal microorganisms can enter water bodies in diverse ways, including runoff, sewage discharges and direct fecal deposition. Once in water, these microorganisms experience conditions that are very different from their original intestinal habitats. The transition from host to aqu...
Transformation and release of nanoparticle additives & byproducts from commercially available surface coatings on pressure treated lumber via dermal contact
(JOURNAL) [Published : Dec 01, 2019]
Production and marketing of “nano-enabled” products for consumer purchase has continued to expand. However, many questions remain about the potential release and transformation of these nanoparticle (NP) additives from products throughout their lifecycle. In this work, two surfac...
Viability of Pseudocapillaria tomentosa Eggs Exposed to Heat, Ultraviolet Light, Chlorine, Iodine, and Desiccation
(JOURNAL) [Published : Sep 25, 2019]
Pseudocapillaria tomentosa is an important pathogen in zebrafish facilities. We investigated heat, ultraviolet (UV) light, chlorine, iodine, and dessciation for killing the parasite's eggs. Eggs released with feces larvate in about 5-10 days, and treatments were evaluated by expo...
Conventional Treatment Options for HABs Impacted Waters, Cincinnati
(PRESENTATION) [Presented : Jun 05, 2018]
The presentation contains results of bench-scale trials conducted in EPA laboratories, as well as the results of field visits by EPA personnel to drinking water treatment facilities. The presentation will focus on drinking water treatment options for waters impacted by harmful a...
Evaluation of and environmentally sustainable UV-assisted water treatment system for removal of Bacillus spores in water
(JOURNAL) [Published : Jun 29, 2018]
In both developing and industrialized nations, a growing number of contaminants are entering water supplies from human activities. In addition, the events of September 11, 2001, in the United States have raised concerns about the potential for intentional contamination of water s...
Incidence of Somatic and F+ Coliphage in Great Lake Basin Recreational Waters
(JOURNAL) [Published : Sep 03, 2018]
There is a growing interest for the potential use of coliphage as an alternative indicator to assess fecal pollution in recreational waters. Coliphage are a group of viruses that infect Escherichia coli and are considered as potential surrogates to infer the likely presence of en...
Technologies for Legionella Control in Premise Plumbing Systems: Cu-Ag Ionization, Ozone, and Ultraviolet Light (UV)
(PRESENTATION) [Presented : May 10, 2018]
This presentation includes summary of Legionella treatment technologies published in 2016 EPA report and the result summary of two case studies conducted in Cincinnati lab regarding Cu-Ag ionization and UV-LED treatment technologies.
Smog exposure and host resistance to respiratory pathogens
(PRESENTATION) [Presented : Mar 16, 2017]
The US EPA is evaluating the health effects of photochemical smog on respiratory, cardiovascular and metabolic health ( Smog exposure has been associated with an increased risk of allergy and decreased res...
Source determination of benzotriazoles in sediment cores from two urban estuaries on the Atlantic Coast of the United States
(JOURNAL) [Published : Jan 20, 2016]
Benzotriazoles (BZTs) are used in a broad range of commercial and industrial products, particularly as metal corrosion inhibitors and as ultraviolet (UV) light stabilizer additives in plastics and polymers. Their long-term usage and high production volumes have resulted in the r...
Environmental Persistence of Bacillus anthracis and Bacillus subtilis Spores
(JOURNAL) [Published : Sep 15, 2015]
Journal Article
[Published : Mar 31, 2015]
<p> The synthesis of the stereoisomers was conducted at the University of Texas Medical Branch in Galveston, Texas. The investigators assessed the purity of each compound by evaluating various analytic parameters such as gas chromatography mass spectrometry and nuclear magnetic...
(PRESENTATION) [Presented : Jun 01, 2015]
There is an increased interest in the application of microbial electrochemical cell (MEC) for the recovery of value-added products such as hydrogen gas and hydrogen peroxide (H2O2) from wastewater. H2O2 has strong oxidation capability and produces hydroxyl radicals when coupled w...