Toxicological effects of primary-treated urban wastewaters, before and after ozone treatment, on freshwater mussels (Elliptio complanata)

2007 ◽  
Vol 145 (4) ◽  
pp. 542-552 ◽  
Author(s):  
F. Gagné ◽  
C. André ◽  
P. Cejka ◽  
C. Gagnon ◽  
C. Blaise
Keyword(s):  
Freshwater Mussels ◽  
Ozone Treatment ◽  
Elliptio Complanata ◽  
Toxicological Effects ◽  
Before And After

scholarly journals UTILIZAÇÃO DE GÁS OZÔNIO NA DESINFECÇÃO DE RESÍDUOS DE SERVIÇOS DE SAÚDE

2018 ◽  
Vol 7 (2) ◽  
pp. 125-139
Author(s):  
Thais Nogueira Gonzaga ◽  
Dora Inés Kozusny-Andreani
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Pseudomonas Aeruginosa ◽  
Candida Albicans ◽  
Health Care Services ◽  
Pathogenic Bacteria ◽  
Ozone Treatment ◽  
Microbiological Analysis ◽  
Before And After ◽  
Staphylococcus Spp

Nesta pesquisa objetivou-se avaliar a viabilidade técnica da aplicação de ozônio como bactericida e fungicida em amostras de resíduos de serviços de saúde potencialmente infectantes. Foram determinados os     micro-organismos presentes nos resíduos gerados em um hospital particular. Para realização das análises microbiológicas e o tratamento com ozônio o material foi particulado e homogeneizado. As análises microbiológicas foram realizadas antes e após a ozonização.Para os testes de desinfecção foram retirados 10,0g de amostra que foi submetida à ozonização por 5, 10, 15, 20 e 25 minutos com doses de 140,0; 280,0; 420,0; 560,0 e 700,0mg L-1 de ozônio, respectivamente. Verificou-se presença de mesófilos totais, coliformes totais e termotolerantes, Escherichia coli, Pseudomonas aeruginosa, Proteus spp., Staphylococcus aureus, Staphylococcus spp, Candida albicans e Rhizopus spp. O ozônio foi eficiente para eliminação de todos os micro-organismos em 20 minutos; nos primeiros cinco minutos de exposição ao gás verificou-se redução superior a 98%.Palavras-chave: Bactérias patogênicas. Fungos. Ozonização. USING OZONE GAS FOR DISINFECTION OF SOLID WASTE FROM HEALTH CARE SERVICES ABSTRACT: The aim of this research was to evaluate the technical viability of the application of ozone as bactericide and fungicide in samples of potentially infectious health services residues. The microorganisms present in the waste generated in a private hospital were determined. The material was particulated and homogenized to perform the microbiological analysis and to undergo ozone treatment. Microbiological analysis was performed before and after ozonization. For the disinfection tests, 10.0g of sample were removed and submitted to ozonization for 5, 10, 15, 20 and 25 minutes with 140,0; 280,0; 420,0; 560,0 and 700,0mg doses of L-1 of ozone, respectively. It was verified the presence of total mesophiles, total and thermotolerant coliforms, Escherichia coli, Pseudomonas aeruginosa, Proteus spp., Staphylococcus aureus, Staphylococcus spp, Candida albicans and Rhizopus spp. Ozone was efficient while eliminating all microorganisms in 20 minutes; in the first five minutes of gas exposure, the reduction was greater than 98%.Keywords: Pathogenic bacteria. Fungi. Ozonization.

Preparation of Ge (100) Substrates for High-Quality Epitaxial Growth of Group IV Materials

2003 ◽  
Vol 794 ◽  
Author(s):  
Mark Nowakowski ◽  
Jordana Bandaru ◽  
L.D. Bell ◽  
Shouleh Nikzad
Keyword(s):  
Epitaxial Growth ◽  
Chemical Treatment ◽  
Photoelectron Spectroscopy ◽  
High Energy ◽  
Ozone Treatment ◽  
High Quality ◽  
Surface Evolution ◽  
Chemical Treatments ◽  
Before And After ◽  
Uv Ozone

ABSTRACTWe compare various wet chemical treatments, in preparing high-quality Ge (100) surfaces suitable for molecular beam epitaxy (MBE). Various surface treatments are explored such as UV-ozone treatment followed by exposure to chemical solutions such as de-ionized (DI) water, hydrofluoric acid (HF), or hydrochloric acid (HCl). Chemical treatments to remove the oxide are performed in a nitrogen environment to prevent further formation of surface oxide prior to surface analysis. Following chemical treatments, in situ reflection high-energy electron diffraction (RHEED) analysis is performed to observe the surface evolution as a function of temperature. In a separate chamber, we analyze each sample, before and after chemical treatment by x-ray photoelectron spectroscopy (XPS) to directly determine the oxide desorption following each chemical treatment. Our results of this comparative study, the effectiveness of each chemical treatment, and the stability of the passivated surface suggest that UV ozone cleaning, followed by 10% HCl is the best choice for removing most of the oxide. Furthermore, we present evidence of high quality epitaxial growth of SnxGe1−x on wafers prepared by our method.

Catalytic ozonation for odour removal of high temperature alumina refinery condensate

2012 ◽  
Vol 66 (8) ◽  
pp. 1781-1786 ◽  
Author(s):  
Xinguang Wang ◽  
Jing Guan ◽  
Richard M. Stuetz
Keyword(s):  
Industrial Wastewater ◽  
Industrial Process ◽  
Catalytic Ozonation ◽  
Ozone Treatment ◽  
Experimental Conditions ◽  
Before And After ◽  
Removal Efficiencies ◽  
Odour Emissions ◽  
Odour Removal ◽  
Dynamic Olfactometry

Odour emissions from aluminium processing can cause an impact on local communities surrounding such facilities. Of particular concern is fugitive odours emitted from the handling and use of refinery condensate streams, particularly the digestion condensate. This study evaluated the application of using catalytic ozonation to treat alumina refinery condensate in order to remove the potential emission of odourous compounds from the industrial wastewater. The technical challenges in treating the alumina refinery condensate are the high pH and temperatures of the wastewater effluent (over 80 °C and pH above 10) due the industrial process. The odour removal efficiencies for different catalysts (FeCl3, MnO, and MnSO4) under experimental conditions in terms of controlled pH, temperature and ozone dosage were determined before and after ozone treatment using dynamic olfactometry. The result demonstrated that the addition of both FeCl3 and MnO catalysts improved odour removal efficiencies during the ozonation of alumina condensates at similar pH and temperature conditions. FeCl3 and MnO had similar enhancement for odour removal, however MnO was determined to be more appropriate than MnSO4 for odour removal due to the colouration of the treated condensate.

Treatment of Contained Herniated Lumbar Discs with Ozone and Corticosteroid: A Pilot Clinical Study

2015 ◽  
Vol 66 (4) ◽  
pp. 377-384 ◽  
Author(s):  
Kieran Murphy ◽  
Mario Muto ◽  
Jim Steppan ◽  
Thomas Meaders ◽  
Chett Boxley
Keyword(s):  
Adverse Events ◽  
Primary Objective ◽  
Ozone Treatment ◽  
Sufficient Evidence ◽  
Controlled Study ◽  
Control Group ◽  
Before And After ◽  
Pilot Clinical Study ◽  
And Function ◽  
Herniated Discs

Purpose The primary objective of this pilot study was to compare pain and function scores from patients before and after an ozone injection in combination with steroids and bupivacaine to treat herniated discs. A secondary objective was to correct some of the methodological weaknesses of some previously published ozone studies. Methods Fifty patients were enrolled; 1-3 mL of 2 wt% ozone in 98 wt% oxygen was delivered into the nucleus pulposus, and 7-9 mL into the adjacent paravertebral tissues. The oxygen/ozone treatment was followed by a periganglionic injection of corticosteroid and bupivacaine. All patients were evaluated 1 month after the treatment to quantify improvement in pain and function, and to monitor for potential adverse events. Results Forty-four patients had intradiscal injections and were included in the analysis. After 1 treatment, 75.0% showed significant improvement in pain based on the visual analog scale (improvement >1.8), 72.7% showed significant improvement in function based on the Oswestry disability index (improvement >15%), and 79.5% showed improvement based on the modified MacNab criteria. There were no adverse events associated with the treatment. Conclusions Patients showed significant improvement in pain and function after receiving ozone injections in combination with steroids and bupivacaine for the treatment of herniated discs. Because of the lack of a control group and short follow-up times, conclusions about the safety and efficacy of ozone injections for the treatment of herniated discs are not warranted. However, the results provide sufficient evidence that the risk and expense of an additional randomized controlled study is merited.

Effect of gaseous ozone application during chilling on microbial and quality attributes of pig carcasses

2021 ◽  
pp. 108201322110149
Author(s):  
Gabriela Orosco Werlang ◽  
Jalusa Deon Kich ◽  
Graciela Volz Lopes ◽  
Arlei Coldebella ◽  
Vivian Feddern ◽  
...  
Keyword(s):  
Lower Number ◽  
Ozone Treatment ◽  
Treatment Control ◽  
Additional Measure ◽  
E Coli ◽  
Gaseous Ozone ◽  
Colony Forming Units ◽  
Before And After ◽  
Pig Carcasses ◽  
Pork Samples

Ozone application has been suggested as an additional measure to the slaughter animals under hygiene programs. In this study, we determined the efficacy of gaseous ozone applied to pig carcasses during chilling (16 h at 2–5°C). Forty carcasses were allocated to each treatment: control, without ozone application (T1) and 5 ppm gaseous ozone application (T2), divided in two 4-h periods. The carcasses were sampled before and after chilling. The average counts of total aerobic mesophilic (TAM) bacteria before chilling were not different (p = 0.55) between T1 and T2. In turn, after chilling, the ozone-treated carcasses had significantly reduced about 0.4 colony-forming units (CFU)/cm2 of TAM counts (p < 0.001) than the control carcasses. No significant reduction was observed in the number of carcasses positive for Listeria sp. and Escherichia coli after gaseous ozone treatment; while a tendency (p = 0.08) of lower number of Salmonella positive carcasses in T2 was observed. Common macrorestriction (pulsed-field gel electrophoresis) patterns of S. enterica were observed in the carcasses before and after chilling. Pork samples from treated and untreated carcasses with ozone showed no lipid oxidation or altered color and pH. The results indicate that the gaseous ozone in the tested protocol is effective in reducing TAM populations, but not effective in decreasing the number of carcasses positive for E. coli and Listeria sp. Regarding Salmonella, the tendency of positive carcasses reduction may encourage further studies by testing other protocols of gaseous ozone application inside the chilling chamber.

An in situ assessment of mercury contamination in the Sudbury River, Massachusetts, using transplanted freshwater mussels (Elliptio complanata)

2000 ◽  
Vol 57 (5) ◽  
pp. 1103-1112 ◽  
Author(s):  
Nancy Beckvar ◽  
Sandra Salazar ◽  
Michael Salazar ◽  
Ken Finkelstein
Keyword(s):  
Freshwater Mussels ◽  
Dry Weight ◽  
Mercury Contamination ◽  
Textile Dye ◽  
Tissue Concentrations ◽  
Mussel Tissue ◽  
Elliptio Complanata ◽  
Average Temperature ◽  
Total Hg ◽  
Growth Differences

Freshwater mussels (Elliptio complanata) were transplanted into the Sudbury River, Massachusetts, to evaluate the bioavailability of total Hg and methyl mercury (MeHg) and the potential impacts to resident species. The principal Hg source is the Nyanza Superfund site, a former textile dye production facility. Mussels (initial tissue concentrations = 640 ng Hg·g dry weight-1 and 120 ng MeHg·g dry weight-1) were transplanted to eight locations in the Sudbury River watershed for 12 weeks. Tissue total Hg concentration increased significantly in mussels at the station closest to the Nyanza site (950 ng Hg·g dry weight-1). Mussel growth, which increased downstream with distance away from the site, was significantly negatively correlated with tissue concentrations of total Hg (r = -0.95) and positively correlated with average temperature (r = 0.85). Due to growth differences, uptake was best assessed by changes in content. Tissue total Hg and MeHg burdens were greatest in mussels at two stations closest to the Nyanza site, with less Hg accumulated in downstream mussels. However, the MeHg content in mussel tissue increased significantly at all Sudbury River stations, indicating that MeHg was bioavailable in all portions of the river evaluated.

Reduction of Alkali-Labile Phosphates in Mussels Exposed to Primary-Treated Wastewaters Undergoing Ozone and Ultraviolet Disinfection: A Pilot Study

2009 ◽  
Vol 44 (2) ◽  
pp. 161-165 ◽  
Author(s):  
François Gagné ◽  
Chantale André ◽  
Patrick Cejka ◽  
Christian Blaise ◽  
Robert Hausler
Keyword(s):  
Ultraviolet Disinfection ◽  
Elliptio Complanata ◽  
Pyrimidine Synthesis ◽  
Estrogenic Effects ◽  
Treated Effluent ◽  
Estrogenic Potential ◽  
Before And After ◽  
Disinfection Procedure ◽  
Rate Limiting ◽  
Somatic Index

Abstract The purpose of this study was to examine the estrogenic potential of a primary municipal effluent, undergoing ozone or ultraviolet disinfection, in Elliptio complanata mussels. Mussels were exposed for seven weeks, using a continuous flowthrough system, to a primary effluent from a major city before and after disinfection. Results showed that the effluents, regardless of the disinfection procedure, readily affected gametogenesis in mussels as determined by gonado-somatic index, and by DNA synthesis as determined by the activity of aspartate transcarbamoylase activity, a rate-limiting enzyme for pyrimidine synthesis. The estrogenic potential of the effluents was observed by the increased levels of alkali-labile phosphate, a generic measure for vitellogenin-like proteins, where the disinfection procedures did not completely remove the estrogenic effects of the primary effluent. Thus, the introduction of an ozone or ultraviolet disinfection step to a primary-treated effluent will likely diminish the estrogenic potential, but not entirely.

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