Understanding the effect of ultraviolet light intensity on disinfection performance through the use of ultraviolet measurements and simulation

2018 ◽  
Vol 39 (9) ◽  
pp. 1122-1124 ◽  
Author(s):  
Brian M. Tande ◽  
Todd A. Pringle ◽  
William A. Rutala ◽  
Maria F. Gergen ◽  
David J. Weber
Keyword(s):  
Clostridium Difficile ◽  
Light Intensity ◽  
Ultraviolet Light ◽  
Computer Simulations ◽  
Uv Light ◽  
Ultraviolet C ◽  
Uv C

AbstractWe measured the disinfection of MRSA and Clostridium difficile spores using an ultraviolet C (UV-C) device, and we correlated those results to measurements and computer simulations of UV-C surface intensity. The results demonstrate both large differences in UV light intensity across various surfaces and how this leads to significant differences in disinfection.

scholarly journals Rapid Hospital Room Decontamination Using Ultraviolet (UV) Light with a Nanostructured UV-Reflective Wall Coating

2013 ◽  
Vol 34 (5) ◽  
pp. 527-529 ◽  
Author(s):  
William A. Rutala ◽  
Maria F. Gergen ◽  
Brian M. Tande ◽  
David J. Weber
Keyword(s):  
Staphylococcus Aureus ◽  
Clostridium Difficile ◽  
Uv Light ◽  
Methicillin Resistant ◽  
Hospital Room ◽  
Ultraviolet C ◽  
Uv C

We tested the ability of an ultraviolet C (UV-C)–reflective wall coating to reduce the time necessary to decontaminate a room using a UV-C-emitting device (Tru-D SmartUVC). The reflective wall coating provided the following time reductions for decontamination: for methicillin-resistant Staphylococcus aureus, from 25 minutes 13 seconds to 5 minutes 3 seconds (P < .05), and for Clostridium difficile spores, from 43 minutes 42 seconds to minutes 24 seconds (P < .05).

scholarly journals Impact of Room Location on UV-C Irradiance and UV-C Dosage and Antimicrobial Effect Delivered by a Mobile UV-C Light Device

2016 ◽  
Vol 37 (6) ◽  
pp. 667-672 ◽  
Author(s):  
John M. Boyce ◽  
Patricia A. Farrel ◽  
Dana Towle ◽  
Renee Fekieta ◽  
Michael Aniskiewicz
Keyword(s):  
Staphylococcus Aureus ◽  
Stainless Steel ◽  
Prospective Observational Study ◽  
Uv Light ◽  
Antimicrobial Effect ◽  
M 10 ◽  
Surgical Ward ◽  
Ultraviolet C ◽  
Vancomycin Resistant ◽  
Uv C

OBJECTIVETo evaluate ultraviolet C (UV-C) irradiance, UV-C dosage, and antimicrobial effect achieved by a mobile continuous UV-C device.DESIGNProspective observational study.METHODSWe used 6 UV light sensors to determine UV-C irradiance (W/cm2) and UV-C dosage (µWsec/cm2) at various distances from and orientations relative to the UV-C device during 5-minute and 15-minute cycles in an ICU room and a surgical ward room. In both rooms, stainless-steel disks inoculated with methicillin-resistant Staphylococcus aureus (MRSA), vancomycin-resistant Enterococcus (VRE), and Clostridium difficile spores were placed next to sensors, and UV-C dosages and log10 reductions of target organisms achieved during 5-minute and 15-minute cycles were determined. Mean irradiance and dosage readings were compared using ANOVA.RESULTSMean UV-C irradiance was nearly 1.0E-03 W/cm2 in direct sight at a distance of 1.3 m (4 ft) from the device but was 1.12E-05 W/cm2 on a horizontal surface in a shaded area 3.3 m (10 ft) from the device (P<.001). Mean UV-C dosages received by UV-C sensors located at different distances and orientation relative to the device varied significantly during 5-minute cycles and during 15-minute cycles (P<.001). Log10 reductions ranged from >4 to 1–3 for MRSA, >4 to 1–2 for VRE and >4 to 0 log10 for C. difficile spores, depending on the distance from, and orientation relative to, the device with 5-minute and 15-minute cycles.CONCLUSIONUV-C irradiance, dosage, and antimicrobial effect received from a mobile UV-C device varied substantially based on location in a room relative to the UV-C device.Infect Control Hosp Epidemiol 2016;37:667–672

scholarly journals Cost-Effective Disinfection Robot Using UVC Radiation

2021 ◽  
Vol 40 ◽  
pp. 02003
Author(s):  
Mansi Dhikle ◽  
Vinaya Dharne ◽  
Pankaja Gaikar ◽  
Kausar Fakir
Keyword(s):  
Video Streaming ◽  
Uv Light ◽  
Low Cost ◽  
Cost Effective ◽  
Live Video ◽  
Medical Facilities ◽  
Ultraviolet C ◽  
Cleaning Robots ◽  
Uv C ◽  
Uvc Radiation

Sanitization with human efforts is not an easy task. Chances of contracting infections increases which leads to additional spread of bacteria. Currently, normal cleaning robots are used in most of the places but looking at the current situation the sanitization techniques need to be improved. The robot uses radiation of UV rays to kill the microrganisms. It gives a live video streaming of its surrounding using a Wi-fi based camera. With the help of Bluetooth module and android mobile, we can control the movement of the robot inside the room without being physically present. It is built with PIC Microcontroller and Ultraviolet-C (UVC) Sanitization LED. UV-C has bandwidth range of 200-280nm and is most powerful when it comes to killing pathogens in the room. This allows us to sterilise the room effectively. By killing the germs, the UV light restricts their multiplication by destroying their reproductive system. Thus use of this robot lowers the threat of infection, cost of traditional cleaning and sterilisation and increases security in medical facilities. Thus, we are trying to implement a more efficient way of sanitization by building a Low cost UV sanitization Robot which can be used in small clinics and for household purpose.

scholarly journals Photo-Rheological Fluid-Based Colorimetric Ultraviolet Light Intensity Sensor

Sensors ◽  
2019 ◽  
Vol 19 (5) ◽  
pp. 1128 ◽  
Author(s):  
Kyung-Pyo Min ◽  
Gi-Woo Kim
Keyword(s):  
Light Intensity ◽  
Ultraviolet Light ◽  
Color Change ◽  
Uv Light ◽  
Image Sensor ◽  
Light Intensities ◽  
New Type

This study presents an introduction to a new type of ultraviolet (UV) light intensity sensor using photo-rheological (PR) fluids whose properties, such as color, can be changed by UV light. When the PR fluids were irradiated by UV light, colorimetric transitions were observed. Effectively, this means that their color changed gradually from yellow to red. The degree of the color change depended on the UV light intensity and was characterized by the hue value of the images acquired with a compact image sensor. We demonstrated that UV light-responsive capabilities can be readily imparted to PR fluids, and that the colorimetric responses to different UV light intensities can be used to measure the UV light intensities.

scholarly journals Impact of a Pulsed Xenon Ultraviolet Light (PX-UV) Light Room Disinfection System on Clostridium difficile Rates

2015 ◽  
Vol 2 (suppl_1) ◽  
Author(s):  
Kathleen Mcmullen ◽  
Helen Wood ◽  
William Buol ◽  
David Johnson ◽  
Anne Bradley ◽  
...  
Keyword(s):  
Clostridium Difficile ◽  
Ultraviolet Light ◽  
Uv Light

scholarly journals UV Light-Irradiated Photocatalytic Degradation of Coffee Processing Wastewater Using TiO2 as a Catalyst

Environments ◽  
2020 ◽  
Vol 7 (6) ◽  
pp. 47 ◽  
Author(s):  
Gurudev Sujatha ◽  
Subramaniam Shanthakumar ◽  
Fulvia Chiampo
Keyword(s):  
Photocatalytic Degradation ◽  
Removal Efficiency ◽  
Photocatalytic Oxidation ◽  
Uv Light ◽  
Oxygen Demand ◽  
Pollutant Removal ◽  
Ultraviolet C ◽  
Catalyst Dosage ◽  
Uv C ◽  
Experimental Runs

The coffee industry generates a significant amount of wastewater that is rich in organic loads and is highly acidic. The present study investigates the potential of the heterogeneous photocatalytic oxidation process to reduce the pollutant load in coffee processing wastewater. The experimental runs were conducted to evaluate the effect of operative parameters such as pH, catalyst dosage, intensity of UV light irradiation, and addition of oxidant on Chemical Oxygen Demand (COD) and colour reduction. Significant results for COD and colour removal, 67%, and 70% respectively, were achieved at a pH of 4 with titanium dioxide (TiO2), and a catalyst dosage of 500 mg/L, using four ultraviolet-C (UV-C) lamps of 16 W each. With the addition of hydrogen peroxide (H2O2) as an oxidant, the removal efficiency increased to 84% and 75% for COD and colour, respectively. Finally, the best results obtained by photocatalytic degradation using UV light were compared to those using solar light. Based on the investigation, it was inferred that the pollutant removal efficiency in coffee pulping wastewater was also considerably high under sunlight. These findings may have relevance in terms of application in countries where coffee processing is carried out and where sunlight irradiance is usually strong: the technique could be exploited to decrease the pollutant content of this wastewater sustainably.

scholarly journals Ultraviolet-C decontamination of a dental clinic setting: required amount of UV light

2020 ◽  
Vol 23 (2) ◽  
Author(s):  
Sergio Brossi Botta ◽  
Fernanda De Sá Teixeira ◽  
Fernando Seishim Hanashiro ◽  
Wagner Wlysses Rodrigues de Araújo ◽  
Alessandra Cassoni ◽  
...  
Keyword(s):  
Ultraviolet Light ◽  
Dental Care ◽  
High Speed ◽  
Uv Light ◽  
Dental Clinic ◽  
Dental Clinics ◽  
Ultraviolet C ◽  
Time Required ◽  
Short Time ◽  
Patient Change

AbstractViruses can spread to the environment, and it can be challenging to clear it. A direct approach to limit airborne transmission of pathogens in dental clinic offices is to inactivate viruses within a short time of their production and block the person-to-person transmission routes in dental clinics. For this, we can use chemical substances on surfaces and germicidal ultraviolet light (UV), typically at 254 nm, for complementary disinfection of surfaces and air contaminated by aerosols produced by high-speed handpiece or ultrasound scaler. Based on the literature review and the similarity of Sars-Cov-2 with other previously studied corovaviruses, COVID-19 is sensitive to UV irradiation that can break the genome of this virus, inactivating it. In our study, we performed the calculation of the time required to decontaminate a dental care room between each patient change. We can conclude that the use of UVC can be incorporated into the dental care routine to reduce cross contamination.KeywordsUVC-decontamination; Sterilization; Ultraviolet light; Dentistry; Sars-Cov-2.

scholarly journals Effectiveness of Ultraviolet-C Room Disinfection on Preventing Healthcare-Associated Clostridioides difficile Infection

2020 ◽  
Vol 41 (S1) ◽  
pp. s33-s33
Author(s):  
Michihiko Goto ◽  
Erin Balkenende ◽  
Gosia Clore ◽  
Rajeshwari Nair ◽  
Loretta Simbartl ◽  
...  
Keyword(s):  
Acute Care ◽  
Acute Care Hospitals ◽  
Incidence Rates ◽  
Positive Test ◽  
Negative Binomial Regression Model ◽  
Test Results ◽  
Clostridioides Difficile ◽  
Ultraviolet C ◽  
Healthcare Associated ◽  
Uv C

Background: Enhanced terminal room cleaning with ultraviolet C (UVC) disinfection has become more commonly used as a strategy to reduce the transmission of important nosocomial pathogens, including Clostridioides difficile, but the real-world effectiveness remains unclear. Objectives: We aimed to assess the association of UVC disinfection during terminal cleaning with the incidence of healthcare-associated C. difficile infection and positive test results for C. difficile within the nationwide Veterans Health Administration (VHA) System. Methods: Using a nationwide survey of VHA system acute-care hospitals, information on UV-C system utilization and date of implementation was obtained. Hospital-level incidence rates of clinically confirmed hospital-onset C. difficile infection (HO-CDI) and positive test results with recent healthcare exposures (both hospital-onset [HO-LabID] and community-onset healthcare-associated [CO-HA-LabID]) at acute-care units between January 2010 and December 2018 were obtained through routine surveillance with bed days of care (BDOC) as the denominator. We analyzed the association of UVC disinfection with incidence rates of HO-CDI, HO-Lab-ID, and CO-HA-LabID using a nonrandomized, stepped-wedge design, using negative binomial regression model with hospital-specific random intercept, the presence or absence of UVC disinfection use for each month, with baseline trend and seasonality as explanatory variables. Results: Among 143 VHA acute-care hospitals, 129 hospitals (90.2%) responded to the survey and were included in the analysis. UVC use was reported from 42 hospitals with various implementation start dates (range, June 2010 through June 2017). We identified 23,021 positive C. difficile test results (HO-Lab ID: 5,014) with 16,213 HO-CDI and 24,083,252 BDOC from the 129 hospitals during the study period. There were declining baseline trends nationwide (mean, −0.6% per month) for HO-CDI. The use of UV-C had no statistically significant association with incidence rates of HO-CDI (incidence rate ratio [IRR], 1.032; 95% CI, 0.963–1.106; P = .65) or incidence rates of healthcare-associated positive C. difficile test results (HO-Lab). Conclusions: In this large quasi-experimental analysis within the VHA System, the enhanced terminal room cleaning with UVC disinfection was not associated with the change in incidence rates of clinically confirmed hospital-onset CDI or positive test results with recent healthcare exposure. Further research is needed to understand reasons for lack of effectiveness, such as understanding barriers to utilization.Funding: NoneDisclosures: None

scholarly journals Ultraviolet-C as a Viable Reprocessing Method for Disposable Masks and Filtering Facepiece Respirators

Polymers ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 801
Author(s):  
Talita Nicolau ◽  
Núbio Gomes Filho ◽  
Andrea Zille
Keyword(s):  
Literature Review ◽  
Systematic Literature Review ◽  
Personal Protective Equipment ◽  
State Of The Art ◽  
Protective Equipment ◽  
Multiple Methods ◽  
Ultraviolet C ◽  
Single Use ◽  
Uv C ◽  
New Strategies

In normal conditions, discarding single-use personal protective equipment after use is the rule for its users due to the possibility of being infected, particularly for masks and filtering facepiece respirators. When the demand for these protective tools is not satisfied by the companies supplying them, a scenario of shortages occurs, and new strategies must arise. One possible approach regards the disinfection of these pieces of equipment, but there are multiple methods. Analyzing these methods, Ultraviolet-C (UV-C) becomes an exciting option, given its germicidal capability. This paper aims to describe the state-of-the-art for UV-C sterilization in masks and filtering facepiece respirators. To achieve this goal, we adopted a systematic literature review in multiple databases added to a snowball method to make our sample as robust as possible and encompass a more significant number of studies. We found that UV-C’s germicidal capability is just as good as other sterilization methods. Combining this characteristic with other advantages makes UV-C sterilization desirable compared to other methods, despite its possible disadvantages.

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