keyword
MENU ▼
Read by QxMD icon Read
search

Uv light disinfection

keyword
https://www.readbyqxmd.com/read/27816441/kinetics-of-inactivation-and-photoreactivation-of-escherichia-coli-using-ultrasound-enhanced-uv-c-light-emitting-diodes-disinfection
#1
Xiaoqin Zhou, Zifu Li, Juanru Lan, Yichang Yan, Nan Zhu
Ultraviolet (UV) disinfection is highly recommended owing to its high disinfection efficiency and disinfection by-products free, and UV Light-Emitting Diodes (UV LEDs) is increasingly becoming an alternative of mercury UV lamps for water disinfection owing to its long lifetime, low input power, and absence of problems on disposal. However, renovation of existing UV lamps faces the challenges for UV disinfection associated with disinfection efficiency and photoreactivation, and modified UV disinfection process is required for practical application...
March 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/27810579/metal-free-inactivation-of-e-coli-o157-h7-by-fullerene-c3n4-hybrid-under-visible-light-irradiation
#2
Kai Ouyang, Ke Dai, Hao Chen, Qiaoyun Huang, Chunhui Gao, Peng Cai
Interest has grown in developing safe and high-performance photocatalysts based on metal-free materials for disinfection of bacterial pathogens under visible light irradiation. In this paper, the C60/C3N4 and C70/C3N4 hybrids were synthesized by a hydrothermal method, and characterized by X-ray diffraction (XRD), UV-vis diffuse reflection spectroscopy (UV-vis DRS), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and high revolution transmission electron microscope (HRTEM)...
October 31, 2016: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/27744093/evaluation-of-propidium-monoazide-and-long-amplicon-qpcr-as-an-infectivity-assay-for-coliphage
#3
Nicole L McLellan, Hung Lee, Marc B Habash
Standardized and rapid assays for viable viral pathogens are needed to inform human health risk assessments. Conventional qPCR is designed to enumerate the gene copies of an organism in a sample, but does not identify those that originated from a viable pathogen. This study was undertaken to evaluate modified qPCR methods as infectivity assays for the enumeration of infectious MS2 coliphage. Propidium monoazide (PMA) treatment coupled with long-amplicon qPCR assays were assessed for their ability to quantify infectious MS2 in pure cultures and following inactivation by a range of UV light exposures and chlorine doses...
October 12, 2016: Journal of Virological Methods
https://www.readbyqxmd.com/read/27714661/the-role-of-visible-light-active-tio2-specimens-on-the-solar-photocatalytic-disinfection-of-e-coli
#4
Nazmiye Cemre Birben, Ayse Tomruk, Miray Bekbolet
Solar photocatalytic disinfection efficiency of novel visible light activated (VLA) photocatalysts was evaluated with the aim of assessing inactivation of Escherichia coli as the pathogen indicator organism present in drinking water. Influence of humic acid (HA) on the photocatalytic disinfection efficiency of the specified VLA TiO2 specimens i.e., N-doped, Se-doped, and Se-N co-doped TiO2 was also investigated. Photocatalytic disinfection efficiency was assessed by the enumeration of bacteria following selected irradiation periods...
October 6, 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/27705845/inactivation-efficiency-and-mechanism-of-uv-tio2-photocatalysis-against-murine-norovirus-using-a-solidified-agar-matrix
#5
Daseul Park, Hafiz Muhammad Shahbaz, Sun-Hyoung Kim, Mijin Lee, Wooseong Lee, Jong-Won Oh, Dong-Un Lee, Jiyong Park
Human norovirus (HuNoV) is the primary cause of viral gastroenteritis worldwide. Fresh blueberries are among high risk foods associated with norovirus related outbreaks. Therefore, it is important to assess intervention strategies to reduce the risk of foodborne illness. The disinfection efficiency of decontamination methods is difficult to evaluate for fruits and vegetables due to an inconsistent degree of contamination and irregular surface characteristics. The inactivation efficiency and mechanism of murine norovirus 1 (MNV-1, a surrogate for HuNoV) was studied on an experimentally prepared solidified agar matrix (SAM) to simulate blueberries using different wavelengths (A, B, C) of UV light both with and without TiO2 photocatalysis (TP)...
December 5, 2016: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/27666295/effectiveness-of-uv-c-light-irradiation-on-disinfection-of-an-esos-%C3%A2-smart-toilet-evaluated-in-a-temporary-settlement-in-the-philippines
#6
Fiona Zakaria, Bertin Harelimana, Josip Ćurko, Jack van de Vossenberg, Hector A Garcia, Christine Maria Hooijmans, Damir Brdjanovic
Ultraviolet germicidal (short wavelength UV-C) light was studied as surface disinfectant in an Emergency Sanitation Operation System(®) smart toilet to aid to the work of manual cleaning. The UV-C light was installed and regulated as a self-cleaning feature of the toilet, which automatically irradiate after each toilet use. Two experimental phases were conducted i.e. preparatory phase consists of tests under laboratory conditions and field testing phase. The laboratory UV test indicated that irradiation for 10 min with medium-low intensity of 0...
October 2016: International Journal of Environmental Health Research
https://www.readbyqxmd.com/read/27593271/multiple-transformation-pathways-of-p-arsanilic-acid-to-inorganic-arsenic-species-in-water-during-uv-disinfection
#7
Suqi Li, Jing Xu, Wei Chen, Yingtan Yu, Zizheng Liu, Jinjun Li, Feng Wu
p-Arsanilic acid (p-ASA) is widely used in China as livestock and poultry feed additive for promoting animal growth. The use of organoarsenics poses a potential threat to the environment because it is mostly excreted by animals in its original form and can be transformed by UV-Vis light excitation. This work examined the initial rate and efficiency of p-ASA phototransformation under UV-C disinfection lamp. Several factors influencing p-ASA phototransformation, namely, pH, initial concentration, temperature, as well as the presence of NaCl, NH4(+), and humic acid, were investigated...
September 2016: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/27548377/fitness-and-recovery-of-bacterial-communities-and-antibiotic-resistance-genes-in-urban-wastewaters-exposed-to-classical-disinfection-treatments
#8
Andrea Di Cesare, Diego Fontaneto, Julia Doppelbauer, Gianluca Corno
Antibiotic resistance genes (ARGs) are increasingly appreciated to be important as micropollutants. Indirectly produced by human activities, they are released into the environment, as they are untargeted by conventional wastewater treatments. In order to understand the fate of ARGs and of other resistant forms (e.g., phenotypical adaptations) in urban wastewater treatment plants (WWTPs), we monitored three WWTPs with different disinfection processes (chlorine, peracetic acid (PAA), and ultraviolet light (UV))...
September 20, 2016: Environmental Science & Technology
https://www.readbyqxmd.com/read/27543692/bactericidal-activity-and-mechanism-of-ti-doped-bioi-microspheres-under-visible-light-irradiation
#9
Jialiang Liang, Jun Deng, Mian Li, Tongyan Xu, Meiping Tong
Ti doped BiOI microspheres were successfully synthesized through a solvothermal method. The photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS) and UV-vis diffuse reflectance spectra (DRS) spectroscopy, respectively. The as-synthesized microspheres had 3D hierarchical structures, and the morphologies and visible-light-driven (VLD) disinfection performances were found to be determined by the amount of loaded Ti...
November 1, 2016: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/27457673/assessment-of-full-scale-biological-nutrient-removal-systems-upgraded-with-physico-chemical-processes-for-the-removal-of-emerging-pollutants-present-in-wastewaters-from-mexico
#10
Edson Baltazar Estrada-Arriaga, Juana Enriqueta Cortés-Muñoz, Arturo González-Herrera, César Guillermo Calderón-Mólgora, Ma de Lourdes Rivera-Huerta, Esperanza Ramírez-Camperos, Leticia Montellano-Palacios, Silvia Lucila Gelover-Santiago, Sara Pérez-Castrejón, Lina Cardoso-Vigueros, Alejandra Martín-Domínguez, Liliana García-Sánchez
Two full-scale biological nutrient removal systems upgraded with three physico-chemical processes (coagulation, chemical precipitation, and neutral Fenton) were evaluated in order to determine the removal of emerging pollutants (EPs) present in municipal wastewater from Mexico. Between 41 and 55 EPs were detected in the influents of two wastewater treatment plants (WWTPs), including personal care products (PPCPs), antibiotics, analgesics, antiepileptics, antilipidemics, antihypertensives, antiseptics, stimulants, and hormones...
November 15, 2016: Science of the Total Environment
https://www.readbyqxmd.com/read/27450254/antibiotic-resistance-genes-fate-and-removal-by-a-technological-treatment-solution-for-water-reuse-in-agriculture
#11
Maria Laura Luprano, Marco De Sanctis, Guido Del Moro, Claudio Di Iaconi, Antonio Lopez, Caterina Levantesi
In order to mitigate the potential effects on the human health which are associated to the use of treated wastewater in agriculture, antibiotic resistance genes (ARGs) are required to be carefully monitored in wastewater reuse processes and their spread should be prevented by the development of efficient treatment technologies. Objective of this study was the assessment of ARGs reduction efficiencies of a novel technological treatment solution for agricultural reuse of municipal wastewaters. The proposed solution comprises an advanced biological treatment (Sequencing Batch Biofilter Granular Reactor, SBBGR), analysed both al laboratory and pilot scale, followed by sand filtration and two different disinfection final stages: ultraviolet light (UV) radiation and peracetic acid (PAA) treatments...
November 15, 2016: Science of the Total Environment
https://www.readbyqxmd.com/read/27403873/micropollutant-degradation-bacterial-inactivation-and-regrowth-risk-in-wastewater-effluents-influence-of-the-secondary-pre-treatment-on-the-efficiency-of-advanced-oxidation-processes
#12
Stefanos Giannakis, Margaux Voumard, Dominique Grandjean, Anoys Magnet, Luiz Felippe De Alencastro, César Pulgarin
In this work, disinfection by 5 Advanced Oxidation Processes was preceded by 3 different secondary treatment systems present in the wastewater treatment plant of Vidy, Lausanne (Switzerland). 5 AOPs after two biological treatment methods (conventional activated sludge and moving bed bioreactor) and a physiochemical process (coagulation-flocculation) were tested in laboratory scale. The dependence among AOPs efficiency and secondary (pre)treatment was estimated by following the bacterial concentration i) before secondary treatment, ii) after the different secondary treatment methods and iii) after the various AOPs...
October 1, 2016: Water Research
https://www.readbyqxmd.com/read/27393967/transformation-of-humic-acid-and-halogenated-byproduct-formation-in-uv-chlorine-processes
#13
Tong Li, Yan Jiang, Xiaoqiang An, Huijuan Liu, Chun Hu, Jiuhui Qu
The synergistic effect of ultraviolet light (UV) and chlorine on the structural transformation of Humic Acid (HA) and formation of chloro-disinfection byproducts (DBPs) in water were investigated, with chlorination as a reference. The transformation and mineralization of HA were enhanced upon co-exposure to UV and chlorine. Electron spin resonance (ESR) studies revealed that hydroxyl radical (OH) and chlorine radical (Cl) were predominant active species in a pH range from 4 to 7, while Cl dominated at pH 2 and pH higher than 7...
October 1, 2016: Water Research
https://www.readbyqxmd.com/read/27379726/arc-discharge-mediated-disassembly-of-viral-particles-in-water
#14
Eun-Jung Lee, Wooseong Lee, Minwoo Kim, Eun Ha Choi, Yun-Ji Kim
In this study, we investigated the inactivation effects on murine norovirus (MNV-1) with/without purification in water using a submerged plasma reactor of arc discharge (underwater arc), which produced a shockwave, UV light, reactive oxygen species and reactive nitrogen species. Underwater arc treatments of 3 and 6 Hz at 12 kV resulted in 2.6- and 4.2-log reductions in the virus titer of non-purified MNV-1 after 1 min of treatment, respectively. The reduction of purified MNV-1 was higher than that of non-purified MNV-1 after underwater arc treatment for all applied conditions (12 or 15 kV and 3 or 6 Hz)...
October 1, 2016: Water Research
https://www.readbyqxmd.com/read/27322066/nitrogen-gas-plasma-generated-by-a-static-induction-thyristor-as-a-pulsed-power-supply-inactivates-adenovirus
#15
Akikazu Sakudo, Yoichi Toyokawa, Yuichiro Imanishi
Adenovirus is one of the most important causative agents of iatrogenic infections derived from contaminated medical devices or finger contact. In this study, we investigated whether nitrogen gas plasma, generated by applying a short high-voltage pulse to nitrogen using a static induction thyristor power supply (1.5 kilo pulse per second), exhibited a virucidal effect against adenoviruses. Viral titer was reduced by one log within 0.94 min. Results from detection of viral capsid proteins, hexon and penton, by Western blotting and immunochromatography were unaffected by the plasma treatment...
2016: PloS One
https://www.readbyqxmd.com/read/27316624/solar-photocatalysis-as-disinfection-technique-inactivation-of-klebsiella-pneumoniae-in-sewage-and-investigation-of-changes-in-antibiotic-resistance-profile
#16
Danae Venieri, Iosifina Gounaki, Maria Bikouvaraki, Vassilios Binas, Apostolos Zachopoulos, George Kiriakidis, Dionissios Mantzavinos
The presence of pathogenic microorganisms in wastewater and their resistant nature to antibiotics impose effective disinfection treatment for public health and environmental protection. In this work, photocatalysis with metal-doped titania under artificial and natural sunlight, chlorination and UV-C irradiation were evaluated for their potential to inactivate Klebsiella pneumoniae in real wastewater. Their overall effect on antibiotic resistance profile and target antibiotic resistance genes (ARGs) was also investigated...
June 14, 2016: Journal of Environmental Management
https://www.readbyqxmd.com/read/27257798/-no-touch-technologies-for-environmental-decontamination-focus-on-ultraviolet-devices-and-hydrogen-peroxide-systems
#17
David J Weber, Hajime Kanamori, William A Rutala
PURPOSE OF REVIEW: This article reviews 'no touch' methods for disinfection of the contaminated surface environment of hospitalized patients' rooms. The focus is on studies that assessed the effectiveness of ultraviolet (UV) light devices, hydrogen peroxide systems, and self-disinfecting surfaces to reduce healthcare-associated infections (HAIs). RECENT FINDINGS: The contaminated surface environment in hospitals plays an important role in the transmission of several key nosocomial pathogens including methicillin-resistant Staphylococcus aureus, vancomycin-resistant Enterococcus spp...
August 2016: Current Opinion in Infectious Diseases
https://www.readbyqxmd.com/read/27174660/uv-c-light-disinfection-of-carbapenem-resistant-enterobacteriaceae-from-high-touch-surfaces-in-a-patient-room-and-bathroom
#18
Clare Rock, Melanie S Curless, Elaine Nowakowski, Tracy Ross, Kathryn A Carson, Polly Trexler, Karen Carroll, Lisa L Maragakis
No abstract text is available yet for this article.
August 2016: Infection Control and Hospital Epidemiology
https://www.readbyqxmd.com/read/27107952/a-high-performance-doped-photocatalysts-for-inactivation-of-total-coliforms-in-superficial-waters-using-different-sources-of-radiation
#19
Elis Marina Turini Claro, Ederio Dino Bidoia, Peterson Bueno de Moraes
Photocatalytic water treatment has a currently elevated electricity demand and maintenance costs, but the photocatalytic water treatment may also assist in overcoming the limitations and drawbacks of conventional water treatment processes. Among the Advanced Oxidation Processes, heterogeneous photocatalysis is one of the most widely and efficiently used processes to degrade and/or remove a wide range of polluting compounds. The goal of this work was to find out a highly efficient photocatalytic disinfection process in superficial water with different doped photocatalysts and using three sources of radiation: mercury vapor lamp, solar simulator and UV-A LED...
July 15, 2016: Journal of Environmental Management
https://www.readbyqxmd.com/read/27099418/antimicrobial-effect-of-three-disinfecting-agents-on-resilon-cones-and-their-effect-on-surface-topography-an-in-vitro-study
#20
Mahesh Martur Chandrappa, Prasanna Mahadevasa Meharwade, Raghu Srinivasan, Shreetha Bhandary, Farhat Nasreen
AIM: The objective of this study was to evaluate the effectiveness of 5.25% sodium hypochlorite (NaOCl), 2% chlorhexidine (CHX), and 2% peracetic acid (PAA) in disinfecting Resilon cones and to evaluate topographical changes microscopically under scanning electron microscope (SEM) after rapid chemical disinfection. MATERIALS AND METHODS: Resilon cones were disinfected in an ultraviolet (UV) light chamber for 20 min and contaminated by immersing in a microbial suspension of Enterococcus faecalis for 30 min...
March 2016: Journal of Conservative Dentistry: JCD
keyword
keyword
53284
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"