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ozone treatment

Gaojian Lin, Qiuting Zhang, Cunjing Lv, Yichao Tang, Jie Yin
We studied the wetting behavior of multiscale self-similar hierarchical wrinkled surfaces. The hierarchical surface was fabricated on poly(dimethylsiloxane) (PDMS) substrates by manipulating the sequential strain release and combined plasma/ultraviolet ozone (UVO) treatment. The generated structured surface shows an independently controlled dual-scale roughness with level-1 small-wavelength wrinkles (wavelength of 700-1500 nm and amplitude of 50-500 nm) resting on level-2 large-wavelength wrinkles (wavelength of 15-35 μm and amplitude of 3...
January 18, 2018: Soft Matter
Kota Shiba, Takuya Kataoka, Motohiro Tagaya
The aggregation/dispersion of luminescent species is a critical factor that determines their luminescence properties. In this study, europium(iii) acetylacetonate (Eu(acac)3) was doped into a titania matrix to form Eu(acac)3-doped titania particles with well-defined size and shape through a microreactor-based sol-gel approach. The morphology and structure of the as-synthesized products were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, scanning transmission electron microscopy and X-ray diffraction measurements...
January 18, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Haiting Wang, Yi Zhou, Zhongpu Jiang
OBJECTIVE: This retrospective study compared the efficacy of combined percutaneous ozone injection and percutaneous discectomyto percutaneous ozone injection alone for the treatment of cervical disc herniation. METHODS: Patients with cervical disc herniation who were enrolled in our hospital from October 2010 to June 2015 were divided into two groups: 1) treated with percutaneous ozone injection alone (control; n= 19); and 2) those treated with combined ozone injection and percutaneous microdiscectomy (combined treatment; n= 28)...
December 29, 2017: Technology and Health Care: Official Journal of the European Society for Engineering and Medicine
Haitham El-Taliawy, Monica Escola Casas, Kai Bester
The major pathway of pharmaceuticals from urban applications to urban surface waters is via wastewater treatment plants. Ozonation is able to remove pharmaceuticals from wastewater effluents. However, during that reaction, ozonation products are formed. Some ozonation products were found to be persistent and have adverse effect on the environment. Moving bed bio reactors (MBBRs) were tested for the removal of the ozonation products of macrolide antibiotics and diclofenac at two different concentration levels 1 μg/L and 10 μg/L in laboratory reactors...
January 5, 2018: Journal of Hazardous Materials
Divya Doneria, Seema Thakur, Parul Singhal, Deepak Chauhan, Karunakar Keshav, Anika Uppal
Objectives: The aim of this study was to evaluate the clinical and radiographic success of zinc oxide (ZnO)-ozonated oil, modified 3Mix antibiotic paste, and vitapex in the treatment of primary molars requiring pulpectomy. Methods: Sixty-four primary molars of forty-three healthy children aged between 4 and 8 years with primary molars requiring root canal procedure were treated with ZnO-ozonated oil, modified 3Mix-MP antibiotic paste, and vitapex. Clinical follow up was done at 1, 6,12 months and 18 months while radiographical follow-up was done at 6,12 and 18 months, respectively...
October 2017: Contemporary Clinical Dentistry
Michael Chys, Wim T M Audenaert, Jan Vangrinsven, Michael Bauwens, Séverine T F C Mortier, Herman Van Langenhove, Ingmar Nopens, Kristof Demeestere, Stijn W H Van Hulle
New robust correlation models for ozonation, based on UVA254 and fluorescence surrogate parameters and developed considering kinetic information, have been applied at pilot-scale. This model framework is validated with the aim for operators to control the ozone dose for the removal of trace organic contaminants (TrOCs) in effluents from full-scale municipal wastewater treatment plants. The inflected correlation model between ΔTrOCs and the surrogates predicts the removal of TrOCs (based on statistical evidence) solely using the 2nd order reaction rate constant with ozone (kO3) and in a more adequate manner than similar single correlation models...
December 27, 2017: Chemosphere
Hakki Celebi, Emine Begüm Büyükerkmen, Emrah Torlak
STATEMENT OF PROBLEM: Impression materials must be disinfected to avoid cross-contamination before they are sent to the dental laboratory. However, whether aqueous state disinfectants affect material wettability is unclear. PURPOSE: The purpose of this in vitro study was to compare the efficacy of gaseous ozone and sodium hypochlorite (NaOCl) in disinfecting light-body consistency hydrophilized polyvinyl siloxane (PVS) impression specimens inoculated with a cocktail of Escherichia coli, Staphylococcus aureus, Pseudomonas aeruginosa, and Enterococcus faecalis...
January 5, 2018: Journal of Prosthetic Dentistry
Ryuichi Kato, Tatsuya Asami, Etsuko Utagawa, Hiroaki Furumai, Hiroyuki Katayama
To assess the potential of pepper mild mottle virus (PMMoV) as a viral process indicator, its reduction through coagulation-sedimentation (CS) and rapid sand filtration (RSF) were compared with those of Escherichia coli, previously used viral indicators, and norovirus genotype II (NoV GII; enteric virus reference pathogen) in a bench-scale experiment. PMMoV log10 reductions in CS (1.96 ± 0.30) and RSF (0.26 ± 0.38) were similar to those of NoV GII (1.86 ± 0.61 and 0.28 ± 0.46). PMMoV, the most abundant viruses in the raw water, was also determined during CS, RSF, and advanced treatment processes at two full-scale drinking water treatment plants under strict turbidity management over a 13-month period...
December 27, 2017: Water Research
Sunil K Gupta, Marisha Sharma, Baisakhi Majumder, Vivek K Maurya, Meenakshi Lohani, Farah Deeba, Vivek Pandey
The present study evaluated the impact of high ambient O3 on morphological, physiological and biochemical traits and leaf proteome in two high-yielding varieties of wheat using ethylene diurea (EDU) as foliar spray (200 and 300 ppm). Average ambient ozone concentration was 60 ppb which was more than sufficient to cause phytotoxic effects. EDU treatment resulted in less lipid peroxidation along with increased chlorophyll content, biomass and yield. EDU alleviated the negative effects of ozone by enhancing activities of antioxidants and antioxidative enzymes...
December 27, 2017: Chemosphere
Arooran Kanagendran, Leila Pazouki, Shuai Li, Bin Liu, Astrid Kännaste, Ülo Niinemets
Ozone is a strong oxidant and a key stress elicitor. The immediate and longer term impacts of ozone are poorly understood in species with emission of both de novo synthesized and stored volatiles, such a tobacco (Nicotiana tabacum), which has terpene-containing glandular trichomes on the leaf surface. In this study, we exposed N. tabacum 'Wisconsin' leaves to acute ozone doses of 0 (control), 400, 600, 800, and 1000 ppb for 30 min and studied the effects of ozone exposure on ozone uptake, gas-exchange characteristics, and emissions of lipoxygenase pathway volatiles, monoterpenes, and sesquiterpenes...
December 30, 2017: Journal of Experimental Botany
Nadine Kotlarz, Nicole Rockey, Terese M Olson, Sarah-Jane Haig, Larry Sanford, John J LiPuma, Lutgarde Raskin
Concentrations of viable microbial cells were monitored using culture-based and culture-independent methods across multi-chamber ozone contactors in a full-scale drinking water treatment plant. Membrane-intact and culturable cell concentrations in ozone contactor effluents ranged from 1,200 to 3,750 cells/mL and from 200 to 3,850 colony forming units/mL, respectively. Viable cell concentrations decreased significantly in the first ozone contact chamber, but rose, even as ozone exposure increased, in subsequent chambers...
January 4, 2018: Environmental Science & Technology
Meghan Marshall, Viviane Yargeau
New treatment technologies and quality monitoring tools are needed for Contaminants of Emerging Concern (CECs) in wastewater. The purpose of this work was to assess the LuminoTox as a monitoring tool for CEC-associated toxicity in municipal wastewater during ozone treatment, and to evaluate the impact of different ozone feed concentrations at equivalent ozone doses for removing toxicity. The LuminoTox was sensitive at monitoring changes in toxicity of atrazine (ATZ) in synthetic wastewater (SWW) and in a 14 CECs mix in secondary effluent (SE) during ozone treatment...
December 27, 2017: Chemosphere
Aihua Bao, Hong Yang, Jie Ji, Yuqin Chen, Wuping Bao, Feng Li, Min Zhang, Xin Zhou, Qiang Li, Suqin Ben
BACKGROUND: Exposure to ambient ozone (O3) increases the susceptivity to allergens and triggers exacerbations in patients with asthma. However, the detailed mechanisms of action for O3 to trigger asthma exacerbations are still unclear. METHODS: An ovalbumin (OVA)-established asthmatic mouse model was selected to expose to filtered air (OVA-model) or 1.0 ppm O3 (OVA-O3 model) during the process of OVA challenge. Next, the possible involvements of p38 MAPK and oxidative stress in the ozone actions on the asthma exacerbations were investigated on the mice of OVA-O3 model by treating them with SB239063 (a p38 MAPK inhibitor), and/or the α-tocopherol (antioxidant)...
December 29, 2017: Respiratory Research
Min Sun, Hao Zhou, Bei Xu, Junxin Bao
Perfluorinated compounds (PFCs), which are widely used in industrial and residential areas, have a large negative impact on the environment. This study investigated the removal efficiency of five PFCs in a drinking water treatment plant. The results indicate that the total PFC concentration in raw water is 261.51 ng L-1 and that perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA) are the predominant pollutants. Among all of the treatment processes, coagulation sedimentation process had the highest removal ratio of PFCs (36...
December 26, 2017: Environmental Science and Pollution Research International
Luca Piemontese, Maria Cristina Messia, Emanuele Marconi, Luisa Falasca, Rosanna Zivoli, Lucia Gambacorta, Giancarlo Perrone, Michele Solfrizzo
Deoxynivalenol (DON) is an important mycotoxin produced by several species of Fusarium. It occurs often in wheat grain and is frequently associated with significant levels of its modified form DON-3-glucoside (DON-3-Glc). Ozone (O3) is a powerful disinfectant and oxidant, classified as GRAS (Generally Recognised As Safe), that reacts easily with specific compounds including the mycotoxins aflatoxins, ochratoxin A, trichothecenes and zearalenone. It degrades DON in aqueous solution and can be effective for decontamination of grain...
December 26, 2017: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
João F Gomes, Maria Emília Quinta-Ferreira, Raquel Costa, Rosa M Quinta-Ferreira, Rui C Martins
Parabens are widely used as antimicrobial and preservatives in pharmaceutical and personal care products and are continuously reaching the water streams. Conventional wastewater treatments are proven inefficient on the removal of this kind of contaminants from wastewater. Therefore, catalytic ozonation appears as a suitable option, due to the oxidant power of ozone and its high capacity of hydroxyl radical generation in the presence of a suitable catalyst. The main drawback of catalytic ozonation is related with the choice of stable and active catalysts at low cost...
December 23, 2017: Environmental Science and Pollution Research International
Jyoti Singh, Ajeet K Srivastva, Payal Mandal, Sonam Chandra, Divya Dubey, Ashish Dwivedi, Deepti Chopra, Anurag Tripathi, Ratan Singh Ray
Pefloxacin (PFLX) is an antibiotic, which shows broad spectrum antimicrobial activities. It is an important derivative of fluoroquinolones (FLQs) group. Ultraviolet radiation (200-400nm) causes major problem for living being which comes at the earth surface naturally through sunlight and increasing regularly due to ozone depletion. PFLX was photodegraded in 5h and forms photoproduct under UVA exposure. At the non photocytotoxic dose PFLX, shows reduced phagocytosis activity, NO (nitric oxide) production, large vacuole formation and down regulated IL-6, TNF-α and IL-1 in BALB/c macrophages at both genes and proteins levels...
December 15, 2017: Journal of Photochemistry and Photobiology. B, Biology
Li-Zhen Deng, Arun S Mujumdar, Qian Zhang, Xu-Hai Yang, Jun Wang, Zhi-An Zheng, Zhen-Jiang Gao, Hong-Wei Xiao
Pretreatment is widely used before drying of agro-products to inactivate enzymes, enhance drying process and improve quality of dried products. In current work, the influence of various pretreatments on drying characteristics and quality attributes of fruits and vegetables is summarized. They include chemical solution (hyperosmotic, alkali, sulfite and acid, etc.) and gas (sulfur dioxide, carbon dioxide and ozone) treatments, thermal blanching (hot water, steam, super heated steam impingement, ohmic and microwave heating, etc), and non-thermal process (ultrasound, freezing, pulsed electric field, and high hydrostatic pressure, etc)...
December 20, 2017: Critical Reviews in Food Science and Nutrition
Mika Sillanpää, Mohamed Chaker Ncibi, Anu Matilainen
Natural organic matter (NOM), a key component in aquatic environments, is a complex matrix of organic substances characterized by its fluctuating amounts in water and variable molecular and chemical properties, leading to various interaction schemes with the biogeosphere and hydrologic cycle. These factors, along with the increasing amounts of NOM in surface and ground waters, make the effort of removing naturally-occurring organics from drinking water supplies, and also from municipal wastewater effluents, a challenging task requiring the development of highly efficient and versatile water treatment technologies...
December 14, 2017: Journal of Environmental Management
Binbin Ma, Zhouhuan Xi, Jiahui Li, Tianqi Gao, Runzhi Liao, Shuhang Wang, Xianyao Li, Yaqin Tang, Zheng Wang, Shengjie Hou, Jinying Jiang, Meichun Deng, Zhigui Duan, Xing Tang, Liping Jiang
Lycosin-I, a spider peptide isolated from the venom of the spider Lycosa singoriensis, has anti-bacteria and anti-cancer properties in organisms. However, cardiovascular effects of Lycosin-I have not been studied. In this study, we investigated for the first time the vasodilator and hypotensive effects of Lycosin-I and the possible mechanisms, in order to develop a promising treatment for hypertension-related diseases. For in vitro experiments, thoracic aortas were isolated, and divided into two groups, endothelium-intact and endothelium-denuded aortic rings...
December 14, 2017: Peptides
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