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Disinfection by-product

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https://www.readbyqxmd.com/read/28221917/escherichia-coli-o157-h7-strains-isolated-from-high-event-period-beef-contamination-have-strong-biofilm-forming-ability-and-low-sanitizer-susceptibility-which-are-associated-with-high-po157-plasmid-copy-number
#1
Rong Wang, Brandon E Luedtke, Joseph M Bosilevac, John W Schmidt, Norasak Kalchayanand, Terrance M Arthur
In the meat industry, a high-event period (HEP) is defined as a time period when beef processing establishments experience an increased occurrence of product contamination by Escherichia coli O157:H7. Our previous studies suggested that bacterial biofilm formation and sanitizer resistance might contribute to HEPs. We conducted the present study to further characterize E. coli O157:H7 strains isolated during HEPs for their potential to cause contamination and to investigate the genetic basis for their strong biofilm-forming ability and high sanitizer resistance...
November 2016: Journal of Food Protection
https://www.readbyqxmd.com/read/28213012/evaluating-and-improving-terminal-hygiene-practices-on-broiler-farms-to-prevent-campylobacter-cross-contamination-between-flocks
#2
Tara Battersby, D Walsh, P Whyte, D Bolton
The objectives of this study were to evaluate current cleaning practices in broiler houses by testing a range of sites after cleaning and disinfection and to test the efficacy of the most commonly used methods in a commercial broiler house after flock harvesting. Cleaning procedures on 20 broiler houses (10 separate farms) were examined by testing a range of sampling points (feeders, drinkers, walls, etc.) for total viable count (TVC), total Enterobacteriaceae count (TEC) and Campylobacter spp. after cleaning and disinfection, using culture based methods...
June 2017: Food Microbiology
https://www.readbyqxmd.com/read/28211324/aqueous-chlorination-of-fenamic-acids-kinetic-study-transformation-products-identification-and-toxicity-prediction
#3
Liyun Ma, Jian Li, Li Xu
Fenamic acids, one important type of non-steroidal anti-inflammatory drugs, are ubiquitous in environmental matrices. Thus it is of high significance to know the fate of them during chlorination disinfection considering their potential toxicity to the environment and humans. In the present study, the chlorination kinetics of three fenamic acids, i.e. mefenamic acid (MEF), tolfenamic acid (TOL) and clofenamic acid (CLO), were examined at different pHs, which followed second-order reaction under studied conditions...
February 8, 2017: Chemosphere
https://www.readbyqxmd.com/read/28208093/oxidative-transformation-of-artificial-sweetener-acesulfame-by-permanganate-reaction-kinetics-transformation-products-and-pathways-and-ecotoxicity
#4
Kai Yin, Fei Li, Ying Wang, Qunying He, Yongxiu Deng, Shuo Chen, Chengbin Liu
Acesulfame has attracted much attention due to its wide application, environmental persistence and potential safety risk of transformation products (TPs). Little information is known on acesulfame transformation in the presence of oxidants/disinfectants. The acesulfame oxidation by permanganate (Mn(VII)) in water under environmentally relevant conditions was systematically evaluated. The pH of water showed negligible influence in acesulfame oxidation. Inorganic ligand (pyrophosphate) exhibited insignificant effect whereas organic ligands (oxalate, ethylene diamine tetraacetic acid, and humic acid) exerted obvious suppression on acesulfame oxidation...
February 9, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28207828/the-wide-spectrum-high-biocidal-potency-of-bioxy-formulation-when-dissolved-in-water-at-different-concentrations
#5
Dori Dagher, Ken Ungar, Richard Robison, Fadi Dagher
Traditional surface disinfectants that have long been applied in medicine, animal husbandry, manufacturing and institutions are inconvenient at best and dangerous at worst. Moreover, some of these substances have adverse environmental impacts: for example, quaternary ammonium compounds ("quats") are reproductive toxicants in both fish and mammals. Halogens are corrosive both to metals and living tissues, are highly reactive, can be readily neutralized by metals, and react with organic matter to form toxic, persistent by-products such as dioxins and furans...
2017: PloS One
https://www.readbyqxmd.com/read/28197147/spoilage-of-microfiltered-and-pasteurized-extended-shelf-life-milk-is-mainly-induced-by-psychrotolerant-spore-forming-bacteria-that-often-originate-from-recontamination
#6
Etienne V Doll, Siegfried Scherer, Mareike Wenning
Premature spoilage and varying product quality due to microbial contamination still constitute major problems in the production of microfiltered and pasteurized extended shelf life (ESL) milk. Spoilage-associated bacteria may enter the product either as part of the raw milk microbiota or as recontaminants in the dairy plant. To identify spoilage-inducing bacteria and their routes of entry, we analyzed end products for their predominant microbiota as well as the prevalence and biodiversity of psychrotolerant spores in bulk tank milk...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28188554/disinfection-by-product-formation-during-chlor-am-ination-of-algal-organic-matters-aom-extracted-from-microcystis-aeruginosa-effect-of-growth-phases-aom-and-bromide-concentration
#7
Juxiang Chen, Naiyun Gao, Lei Li, Mingqiu Zhu, Jing Yang, Xian Lu, Yansen Zhang
Algae organic matter (AOM), including extracellular organic matter (EOM) and intracellular organic matter (IOM), has caused a series of problems to the water quality, among which formation of disinfection by-products (DBPs) during subsequent chlor(am)ination process was especially serious and concerned. This study characterized physicochemical properties of the EOM and IOM solution extracted from different growth phases of Microcystis aeruginosa and investigated the corresponding formation potential of DBPs during chlor(am)ination process...
February 10, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28185729/application-of-ozonation-for-pharmaceuticals-and-personal-care-products-removal-from-water
#8
REVIEW
João Gomes, Raquel Costa, Rosa M Quinta-Ferreira, Rui C Martins
Due to the shortening on natural water resources, reclaimed wastewater will be an important water supply source. However, suitable technologies must be available to guaranty its proper detoxification with special concern for the emerging pharmaceutical and personal care products that are continuously reaching municipal wastewater treatment plants. While conventional biological systems are not suitable to remove these compounds, ozone, due to its interesting features involving molecular ozone oxidation and the possibility of generating unselective hydroxyl radicals, has a wider range of action on micropollutants removal and water disinfection...
February 6, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28174046/prenatal-exposure-to-drinking-water-disinfection-by-products-and-dna-methylation-in-cord-blood
#9
Pan Yang, Bin Zhou, Wen-Cheng Cao, Yi-Xin Wang, Zhen Huang, Jin Li, Wen-Qing Lu, Qiang Zeng
Maternal exposure to drinking water disinfection by-products (DBPs) during pregnancy has been related to adverse birth outcomes. While experimental studies have shown that exposure to DBPs induce DNA hypomethylation, evidence from humans is limited. This study aimed to examine whether prenatal exposure to drinking water DBPs was associated with DNA methylation in cord blood. Maternal biomarkers of exposure to drinking water DBPs including blood trihalomethanes [THMs, including chloroform (TCM), bromodichloromethane (BDCM), dibromochloromethane (DBCM), and bromoform (TBM)] and urinary trichloroacetic acid (TCAA) were measured during late pregnancy...
February 4, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28174041/occurrence-origin-and-toxicity-of-disinfection-byproducts-in-chlorinated-swimming-pools-an-overview
#10
REVIEW
Tarek Manasfi, Bruno Coulomb, Jean-Luc Boudenne
Disinfection treatments are critical to conserve the microbiological quality of swimming pool water and to prevent water-borne infections. The formation of disinfection byproducts (DBPs) in swimming pools is an undesirable consequence resulting from reactions of disinfectants (e.g. chlorine) with organic and inorganic matter present in pool water, mainly brought by bathers. A considerable body of occurrence studies has identified several classes of DBPs in swimming pools with more than 100 compounds detected, mainly in chlorinated freshwater pools...
January 30, 2017: International Journal of Hygiene and Environmental Health
https://www.readbyqxmd.com/read/28171837/efficient-photoreductive-decomposition-of-n-nitrosodimethylamine-by-uv-iodide-process
#11
Zhuyu Sun, Chaojie Zhang, Xiaoyun Zhao, Jing Chen, Qi Zhou
N-nitrosodimethylamine (NDMA) has aroused extensive concern as a disinfection byproduct due to its high toxicity and elevated concentration levels in water sources. This study investigates the photoreductive decomposition of NDMA by UV/iodide process. The results showed that this process is an effective strategy for the treatment of NDMA with 99.2% NDMA removed within 10min. The depletion of NDMA by UV/iodide process obeyed pseudo-first-order kinetics with a rate constant (k1) of 0.60±0.03min(-1). Hydrated electrons (eaq(-)) generated by the UV irradiation of iodide were proven to play a critical role...
December 26, 2016: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28167854/estimation-of-mean-number-of-daily-hand-hygiene-procedures-per-patient-can-represent-an-effective-and-easy-understandable-method-to-evaluate-adherence-experience-in-a-tertiary-care-pediatric-hospital-of-northern-italy
#12
P Tatarelli, I Lorenzi, I Caviglia, R A Sacco, D LA Masa, E Castagnola
INTRODUCTION: Hand decontamination with alcohol-based antiseptic agents is considered the best practise to reduce healthcare associated infections. We present a new method to monitor hand hygiene, introduced in a tertiary care pediatric hospital in Northern Italy, which estimates the mean number of daily hand decontamination procedures performed per patient. METHODS: The total amount of isopropyl alcohol and chlorhexidine solution supplied in a trimester to each hospital ward was put in relation with the number of hospitalization days, and expressed as litres/1000 hospitalization-days (World Health Organization standard method)...
December 2016: Journal of Preventive Medicine and Hygiene
https://www.readbyqxmd.com/read/28167408/thm-and-haa-formation-from-nom-in-raw-and-treated-surface-waters
#13
D M Golea, A Upton, P Jarvis, G Moore, S Sutherland, S A Parsons, S J Judd
The disinfection by-product (DBP) formation potential (FP) of natural organic matter (NOM) in surface water sources has been studied with reference to the key water quality determinants (WQDs) of UV absorption (UV254), colour, and dissolved organic carbon (DOC) concentration. The data set used encompassed raw and treated water sampled over a 30-month period from 30 water treatment works (WTWs) across Scotland, all employing conventional clarification. Both trihalomethane (THM) and haloacetic acid (HAA) FPs were considered...
January 29, 2017: Water Research
https://www.readbyqxmd.com/read/28161516/identification-and-determination-of-disinfection-byproducts-in-chlorine-containing-household-cleansing-products
#14
Ho-Sang Shin, Hyun-Hee Lim
Seven halogenated volatile organic compounds (HVOCs) and two haloacetic acids were detected and quantified in 15 household products, including sodium hypochlorite, by gas chromatography-mass spectrometry (GC-MS). Chloroform was detected in a range of 0.2-30.2 mg kg(-1) in all products, and carbon tetrachloride was observed in 13 samples in a range of 0.05-352 mg kg(-1). Dichloroacetic acid and trichloroacetic acid were also detected up to 94 and 146 mg kg(-1) in household products. The estimated human exposures of chloroform, carbon tetrachloride, dichloroacetic acid and trichloroacetic acid were calculated to 0...
January 20, 2017: Chemosphere
https://www.readbyqxmd.com/read/28161488/cold-atmospheric-pressure-plasma-elimination-of-clinically-important-single-and-mixed-species-biofilms
#15
Martina Modic, Neil P McLeod, J Mark Sutton, James L Walsh
Mixed-species biofilms reflect the natural environment of many pathogens in clinical settings and are highly resistant to disinfection methods. An indirect cold atmospheric-pressure air-plasma system was evaluated under two different discharge conditions for its ability to kill representative Gram-positive (Staphylococcus aureus) and Gram-negative (Pseudomonas aeruginosa) pathogens. Plasma treatment of individual 24-h-old biofilms and mixed-species biofilms that contained additional species (Enterococcus faecalis and Klebsiella pneumoniae) was considered...
February 1, 2017: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/28153699/detection-formation-and-occurrence-of-13-new-polar-phenolic-chlorinated-and-brominated-disinfection-byproducts-in-drinking-water
#16
Yang Pan, Ying Wang, Aimin Li, Bin Xu, Qiming Xian, Chendong Shuang, Peng Shi, Qing Zhou
Recently, 13 new polar phenolic chlorinated and brominated disinfection byproducts (Cl- and Br-DBPs) were identified and quantified in simulated chlorinated drinking water by adopting product ion scan, precursor ion scan, and multiple reaction monitoring (MRM) analyses using ultra performance liquid chromatography/electrospray ionization-triple quadrupole mass spectrometry (UPLC/ESI-tqMS). The 13 new DBPs have been drawing increasing concern not only because they possess significantly higher growth inhibition, developmental toxicity, and chronic cytotoxicity than commonly known aliphatic DBPs, but also because they act as intermediate DBPs that can decompose to form the U...
January 24, 2017: Water Research
https://www.readbyqxmd.com/read/28138784/implementation-of-a-risk-orientated-hygiene-analysis-for-the-control-of-salmonella-java-in-the-broiler-production
#17
Franziska Kloska, Maximilian Casteel, Frederik Wilms-Schulze Kump, Günter Klein
This field study aimed to establish a risk-orientated hygiene analysis on two broiler farms in Northwestern Germany for the practical use in broiler housing to evaluate the success of disinfection procedures for eradicating S. Java. The risk-orientated hygiene analysis enables fast, reproducible and cost-effective testing of broiler farms and in turn helps minimize the public health risk ensuing from S. Java. Farms were tested before and after cleaning as well as after disinfection according to a risk-orientated hygiene analysis for the presence of Salmonella DNA with qPCR...
January 31, 2017: Current Microbiology
https://www.readbyqxmd.com/read/28117982/evaluating-activated-carbon-adsorption-of-dissolved-organic-matter-and-micropollutants-using-fluorescence-spectroscopy
#18
Kyle K Shimabuku, Anthony M Kennedy, Riley E Mulhern, R Scott Summers
Dissolved organic matter (DOM) negatively impacts granular activated carbon (GAC) adsorption of micropollutants and is a disinfection byproduct precursor. DOM from surface waters, wastewater effluent, and 1 kDa size fractions were adsorbed by GAC and characterized using fluorescence spectroscopy, UV-absorption, and size exclusion chromatography (SEC). Fluorescing DOM was preferentially adsorbed relative to UV-absorbing DOM. Humic-like fluorescence (peaks A and C) was selectively adsorbed relative to polyphenol-like fluorescence (peaks T and B) potentially due to size exclusion effects...
February 14, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28110150/enhanced-degradation-of-iopamidol-by-peroxymonosulfate-catalyzed-by-two-pipe-corrosion-products-cuo-and-%C3%AE-mno2
#19
Jun Hu, Huiyu Dong, Jiuhui Qu, Zhimin Qiang
Peroxymonosulfate (PMS) is a promising alternative for drinking water disinfection; also many organic micropollutants may be present in drinking water sources nowadays. However, pipe corrosion products (PCPs) may impact the reactions between a disinfectant and organic micropollutants in water distribution systems. This study investigated iopamidol (IPM) degradation by PMS under catalysis of two PCPs (i.e., CuO and δ-MnO2). The pseudo-first-order rate constant of IPM degradation in the CuO/PMS system (CuPS) was 3...
January 16, 2017: Water Research
https://www.readbyqxmd.com/read/28110142/characteristics-of-water-obtained-by-dewatering-cyanobacteria-containing-sludge-formed-during-drinking-water-treatment-including-c-n-disinfection-byproduct-formation
#20
Hangzhou Xu, Haiyan Pei, Yan Jin, Hongdi Xiao, Chunxia Ma, Jiongming Sun, Hongmin Li
This is the first study to systematically investigate the characteristics of the water obtained by dewatering cyanobacteria-containing sludge generated in the drinking water treatment plant, including formation of C- and N-disinfection by-products (DBPs). Results showed that this 'dewatering water' (DW) had different properties when the sludge was stored at different times. The content of dissolved organic matter (DOM) and microcystins (MCs) in the DW were low when the sludge was treated or disposed of within 4 days; correspondingly, the C-, N-DBP production was also low...
January 13, 2017: Water Research
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