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https://www.readbyqxmd.com/read/28213337/effect-of-advanced-oxidation-on-n-nitrosodimethylamine-ndma-formation-and-microbial-ecology-during-pilot-scale-biological-activated-carbon-filtration
#1
Dong Li, Ben Stanford, Eric Dickenson, Wendell O Khunjar, Carissa L Homme, Erik J Rosenfeldt, Jonathan O Sharp
Water treatment combining advanced oxidative processes with subsequent exposure to biological activated carbon (BAC) holds promise for the attenuation of recalcitrant pollutants. Here we contrast oxidation and subsequent biofiltration of treated wastewater effluent employing either ozone or UV/H2O2 followed by BAC during pilot-scale implementation. Both treatment trains largely met target water quality goals by facilitating the removal of a suite of trace organics and bulk water parameters. N-nitrosodimethylamine (NDMA) formation was observed in ozone fed BAC columns during biofiltration and to a lesser extent in UV/H2O2 fed columns and was most pronounced at 20 min of empty bed contact time (EBCT) when compared to shorter EBCTs evaluated...
February 2, 2017: Water Research
https://www.readbyqxmd.com/read/28202265/association-between-chronic-exposure-to-air-pollution-and-mortality-in-the-acute-respiratory-distress-syndrome
#2
Barret Rush, Robert C McDermid, Leo Anthony Celi, Keith R Walley, James A Russell, John H Boyd
The impact of chronic exposure to air pollution and outcomes in the acute respiratory distress syndrome (ARDS) is unknown. The Nationwide Inpatient Sample (NIS) from 2011 was utilized for this analysis. The NIS is a national database that captures 20% of all US in-patient hospitalizations from 47 states. Patients with ARDS who underwent mechanical ventilation from the highest 15 ozone pollution cities were compared with the rest of the country. Secondary analyses assessed outcomes of ARDS patients for ozone pollution and particulate matter pollution on a continuous scale by county of residence...
February 12, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28193413/criegee-mechanism-as-a-safe-pathway-of-color-reduction-in-sugarcane-juice-by-ozonation
#3
Juliana Aparecida de Souza Sartori, Célio Fernando Figueiredo Angolini, Marcos Nogueira Eberlin, Claudio Lima de Aguiar
The production of crystal sugar is based on sugarcane juice clarification through sulphitation, that is, heat treatment with sulfur dioxide. The use of ozonation as an alternative to sulphitation aims to eliminate the disadvantageous presence of residual sulfite in crystal sugar. Both treatments are used to reduce color of sugarcane juice. The objective of this work was to evaluate two process parameters (temperature and pH) to reduce gallic acid, a low molecular weight pigment (MW 170gmol(-1)) widely found in sugarcane...
June 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28187330/experimental-effect-of-ozone-upon-the-microbial-flora-of-commercially-produced-dairy-fermented-products
#4
A Alexopoulos, S Plessas, Y Kourkoutas, C Stefanis, S Vavias, C Voidarou, I Mantzourani, E Bezirtzoglou
Ozone was used to control spoilage microorganisms during the manufacturing of dairy products. Ozone stream was applied onto the surface of freshly filled yoghurt cups just before storage for curd development in order to prevent cross contamination from spoilage airborne microorganisms. Accordingly, brine solution was bubbled with ozone for various periods of time and used for ripening of white (feta type) cheese. Both products were subjected to a continuous monitoring of microbial load and also tested for their sensorial properties...
January 27, 2017: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/28185729/application-of-ozonation-for-pharmaceuticals-and-personal-care-products-removal-from-water
#5
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/28174047/gammarus-fossarum-as-a-sensitive-tool-to-reveal-residual-toxicity-of-treated-wastewater-effluents
#6
Adriana Wigh, Olivier Geffard, Khedidja Abbaci, Adeline Francois, Patrice Noury, Alexandre Bergé, Emmanuelle Vulliet, Bruno Domenjoud, Adriana Gonzalez-Ospina, Sylvie Bony, Alain Devaux
Wastewater treatment plants (WWTPs) are one of the main sources of freshwater pollution eventually resulting in adverse effects in aquatic organisms. Treated effluents can contain many micropollutants at concentrations often below the limit of chemical quantification. On a regulatory basis, WWTP effluents have to be non-toxic to the aquatic environment, wherefore not only chemical abatement but also ecotoxicological evaluation through relevant bioassays is required. Standardized bioassays currently used are often not sensitive enough to reveal a residual toxicity in treated effluents...
February 4, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28169126/medium-high-frequency-ultrasound-and-ozone-based-advanced-oxidation-for-amoxicillin-removal-in-water
#7
Rana Kıdak, Şifa Doğan
In this study, treatment of an antibiotic compound amoxicillin by medium-high frequency ultrasonic irradiation and/or ozonation has been studied. Ultrasonic irradiation process was carried out in a batch reactor for aqueous amoxicillin solutions at three different frequencies (575, 861 and 1141kHz). The applied ultrasonic power was 75W and the diffused power was calculated as 14.6W/L. The highest removal was achieved at 575kHz ultrasonic frequency (>99%) with the highest pseudo first order reaction rate constant 0...
January 28, 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28169026/fluorescence-spectroscopy-and-parallel-factor-analysis-as-a-dissolved-organic-monitoring-tool-to-assess-treatment-performance-in-drinking-water-trains
#8
M Vera, S Cruz, M R Boleda, J Mesa, J Martín-Alonso, S Casas, O Gibert, J L Cortina
Fluorescence excitation emission matrix (FEEM) spectroscopy was used to evaluate its applicability as a tool to track dissolved organic matter (DOM) in a drinking water treatment plant (DWTP) that incorporates a conventional line (consisting in ozonation and GAC filtration) and a membrane-based line (consisting in ultrafiltration, reverse osmosis and mineralization) working in parallel. Seven sampling points within the different process stages were characterized monthly during 2014. A global Parallel Factor Analysis (PARAFAC) was used to pull out underlying organic fractions from the fluorescence spectra...
February 3, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28162800/photosynthetic-responses-to-ozone-of-upper-and-lower-canopy-leaves-of-fagus-crenata-blume-seedlings-grown-under-different-soil-nutrient-conditions
#9
Yoshiyuki Kinose, Yoshinobu Fukamachi, Shigeaki Okabe, Hiroka Hiroshima, Makoto Watanabe, Takeshi Izuta
We aimed to clarify the effects of ozone (O3) on photosynthetic ability of upper and lower canopy leaves of Fagus crenata Blume seedlings grown under different soil nutrient conditions. To accomplish this objective, we analyzed the response of photosynthetic parameters such as maximum carboxylation rate (Vcmax) to cumulative stomatal O3 uptake (ΣFst) and reduction rate of Vcmax per unit ΣFst as an index of detoxification capacity for O3. The seedlings of Fagus crenata were grown for two growing seasons (2014-2015) in nine treatments comprised of a combination of three levels of gas treatments (charcoal-filtered air or 1...
February 2, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28162046/degradation-of-2-4-dichlorophenoxyacetate-isopropyl-amine-2-4-d-ipa-by-o3-ac-uv-in-an-internally-slurry-airlift-photo-reactor
#10
Jamshid Behin, Negin Farhadian
An externally illuminated slurry airlift reactor (ALR) was used to decompose 2,4-D IPA during catalytic ozonation with activated carbon. The effect of superficial gas velocity (0.05-0.15 cm/s), UVAB irradiation (0-60 W), treatment period (10-30 min) and amount of activated carbon (0-0.8 g/l) on removal efficiency was investigated using response surface methodology (RSM) based on Box-Behnken surface statistical design. Well-defined circulation pattern in the ALR allowed all the fluid elements to be exposed to high light intensity zone and achieve sufficient contact between the solid catalyst and the pollutant...
February 6, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28153749/energy-landscape-of-a-gstp1-polymorph-linked-with-cytological-function-decay-in-response-to-chemical-stressors
#11
Zarrin Basharat, Azra Yasmin
Gene polymorphisms lead to varied structure and functional properties. A single nucleotide polymorphism (SNP) i.e. Ile105Val (rs1695) in glutathione S-transferase P1 (GSTP1) gene influences cytological toxicity and modulates the risk to occupational diseases. Apart from this, cancer, neuropathy, NOx, SOx and ozone mediated respiratory function decline including lung inflammation, asthma, allergy etc., have been reported in people with this missense mutation. Here, the functional properties of rs1695 polymorph are revisited through a computational approach...
January 30, 2017: Gene
https://www.readbyqxmd.com/read/28153699/detection-formation-and-occurrence-of-13-new-polar-phenolic-chlorinated-and-brominated-disinfection-byproducts-in-drinking-water
#12
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/28152417/leaf-traits-and-photosynthetic-responses-of-betula-pendula-saplings-to-a-range-of-ground-level-ozone-concentrations-at-a-range-of-nitrogen-loads
#13
Harry Harmens, Felicity Hayes, Katrina Sharps, Gina Mills, Vicent Calatayud
Ground-level ozone (O3) concentrations and atmospheric nitrogen (N) deposition rates have increased strongly since the 1950s. Rising ground-level O3 concentrations and atmospheric N deposition both affect plant physiology and growth, however, impacts have often been studied in isolation rather than in combination. In addition, studies are often limited to a control treatment and one or two elevated levels of ozone and/or nitrogen supply. In the current study, three-year old Betula pendula saplings were exposed to seven different O3 profiles (24h mean O3 concentration of 36-68ppb in 2013, with peaks up to an average of 105ppb) in precision-controlled hemispherical glasshouses (solardomes) and four different N loads (10, 30, 50 or 70kgNha(-1)y(-1)) in 2012 and 2013...
January 16, 2017: Journal of Plant Physiology
https://www.readbyqxmd.com/read/28117151/concentrations-and-patterns-of-perfluoroalkyl-and-polyfluoroalkyl-substances-in-a-river-and-three-drinking-water-treatment-plants-near-and-far-from-a-major-production-source
#14
Virginie Boiteux, Xavier Dauchy, Cristina Bach, Adeline Colin, Jessica Hemard, Véronique Sagres, Christophe Rosin, Jean-François Munoz
Perfluoroalkyl and polyfluoroalkyl substances (PFASs) are emerging contaminants that have been detected in the environment, biota and humans. Drinking water is a route of exposure for populations using water contaminated by PFAS discharges. This research entailed measuring concentrations, mass flows and investigating the fate of dozens PFASs in a river receiving effluents from a fluorochemical manufacturing facility. To measure the total concentration of perfluoroalkyl carboxylic acid (PFCA) precursors, an oxidative conversion method was used...
January 20, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28115767/combined-effect-of-ozonation-and-packaging-on-shelf-life-extension-of-fresh-chicken-legs-during-storage-under-refrigeration
#15
Ioanna N Gertzou, Panagiotis E Drosos, Ioannis K Karabagias, Kyriakos A Riganakos
The aim of the present study was to investigate the effect of different ozone doses (2, 5, and 10 mg/L) on shelf life extension of fresh chicken legs, packaged in polyamide/poleyethylene bags and stored at 4 ± 1 °C, for a period of 12 days. Parameters taken into account were: microbiological (Total viable count, Pseudomonas spp., Lactic acid bacteria, Yeasts and molds, and Enterobacteriaceae), physicochemical (pH, colour) and sensory (odor, appearance, texture, and taste) attributes. Results showed that colour parameter values (L*, a*, and b*) were not affected by the gaseous ozone dose, whereas only L* and b* were reduced during storage in all samples...
December 2016: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/28115016/the-temporal-effect-of-platelet-rich-plasma-on-pain-and-physical-function-in-the-treatment-of-knee-osteoarthritis-systematic-review-and-meta-analysis-of-randomized-controlled-trials
#16
Longxiang Shen, Ting Yuan, Shengbao Chen, Xuetao Xie, Changqing Zhang
BACKGROUND: Quite a few randomized controlled trials (RCTs) investigating the efficacy of platelet-rich plasma (PRP) for treatment of knee osteoarthritis (OA) have been recently published. Therefore, an updated systematic review was performed to evaluate the temporal effect of PRP on knee pain and physical function. METHODS: Pubmed, Embase, Cochrane library, and Scopus were searched for human RCTs comparing the efficacy and/or safety of PRP infiltration with other intra-articular injections...
January 23, 2017: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/28107749/use-of-fluorescence-spectroscopy-to-control-ozone-dosage-in-recirculating-aquaculture-systems
#17
Aikaterini Spiliotopoulou, Richard Martin, Lars-Flemming Pedersen, Henrik R Andersen
The aim of this study was to investigate the potential of fluorescence spectroscopy to be used as an ozone dosage determination tool in recirculating aquaculture systems (RASs), by studying the relationship between fluorescence intensities and dissolved organic matter (DOM) degradation by ozone, in order to optimise ozonation treatment. Water samples from six different Danish facilities (two rearing units from a commercial trout RAS, a commercial eel RAS, a pilot RAS and two marine water aquariums) were treated with different O3 dosages (1...
December 24, 2016: Water Research
https://www.readbyqxmd.com/read/28097924/enhancing-the-performance-of-electro-peroxone-by-incorporation-of-uv-irradiation-and-bdd-anodes
#18
Nasr Bensalah, Ahmed Bedoui
In this work, the treatment of 4-nitrophenol (NP) in water by ozonation, electrolysis, electro-peroxone (EP), and photo-electro-peroxone (PEP) processes was investigated. PEP process is based on the combination of ozonation, UV irradiation, and electrolysis using carbon felt cathode and Boron Doped Diamond (BDD) anode. In this process, H2O2 is electrochemically generated from reduction of O2 in the ozone generator effluent at a carbon felt cathode. The insitu generated H2O2 is simultaneously decomposed by UV- photolysis and by reaction with O3 to form HO(-) radicals that can rapidly and non-selectively oxidize organic pollutants...
January 18, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28097518/beneficial-effects-of-ozone-therapy-on-oxidative-stress-cardiac-functions-and-clinical-findings-in-patients-with-heart-failure-reduced-ejection-fraction
#19
Mutlu Buyuklu, Fatih Mehmet Kandemir, Turan Set, Eftal Murat Bakırcı, Husnu Degirmenci, Hikmet Hamur, Ergun Topal, Sefa Kucukler, Kultigin Turkmen
The aim of study was to determine the effects of ozone therapy on the oxidative stress, cardiac functions and clinical findings in patients with heart failure reduced ejection fraction (HFrEF). A total of 40 patients with New York Heart Association 2 and 3 HF with left ventricular ejection fraction (LVEF) <35%, and 40 subjects without HF as control group were included in the study. Patients with HFrEF were given additional ozone therapy of major and minor administrations along with conventional HF treatment for 5 weeks...
January 17, 2017: Cardiovascular Toxicology
https://www.readbyqxmd.com/read/28097285/localization-in-an-idealized-heterogeneous-elastic-sheet
#20
Bekele J Gurmessa, Andrew B Croll
Localized deformation is ubiquitous in many natural and engineering materials as they approach failure, and a significant effort has been made to understand localization processes with simple continuum models. Real materials are much more commonly heterogeneous but it is unclear exactly how heterogeneity affects outcomes. In this work we study the response of an idealized heterogenous elastic sheet on a soft foundation as it is uniaxially compressed. The patterned surface layers are created by selective ultraviolet/ozone treatment of the top surface of a polydimethylsiloxane (PDMS) sample using a TEM grid as a mask...
January 18, 2017: Soft Matter
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