Showing results for: ozone analyzer Articles
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Influence of land-sea breezes on nocturnal ozone maxima observed in urban sites
Sometimes nocturnal ozone maxima have been observed, contrasting with the nocturnal minimum values of typical daily profile. The influence of land-sea breeze on the nocturnal ozone maxima was analysed in two urban sites strongly influenced by traffic emissions. Results showed that the increase in nocturnal ozone concentration, as well as its maxima was caused by horizontal advection of ozone, ...
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Surface ozone measurements and meteorological influences in the urban atmosphere of Istanbul
Hourly measurements of ozone concentration in the urban atmosphere of Istanbul were carried out from February 1998 to July 1999. An assessment of the annual variations and relationships of ozone concentrations and meteorological variables was made. Annual variations were first examined without considering meteorological variables, and meteorological influences on ozone seasonal values were then ...
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Effect of the soil wetness state on the stomatal ozone fluxes over Hungary
A coupled Eulerian photochemical reaction-transport model and a detailed ozone dry deposition model have been utilised for the estimation of stomatal ozone fluxes over Hungary. Ozone concentrations were modelled on an unstructured triangular grid using a method of lines approach to the solution of the reaction-diffusion-advection equations describing ozone formation, transport and deposition. The ...
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Ozone Based AOP process for refractory COD reduction in industrial waster water
Introduction In recent years improvements in ozone based advanced oxidation technology efficiencies have lowered capital and operating expenses, improving the viability of the use of ozone as the main oxidant. An investigation into alternatives for refractory COD removal which is economically attractive and do not produce sludge lead to an evaluation of ozone based advanced oxidation processes ...
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Utilisation and integration of interdisciplinary computer models into a tool for analysing ozone production from transportation sources
High ozone levels detected over large inland areas in Israel triggered an analysis of air mass back-trajectory, which pointed to the coastal Tel-Aviv metropolitan transportation system as the origin of the ozone's precursors. In order to link the transportation emissions to ozone formation, interdisciplinary modelling systems were utilised and integrated. The transportation-to-ozone formation ...
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Northern Sonoma County APCD Healdsburg, CA - Case Study
In 2009 when Air Quality Specialist George Erdman took over management of his air district’s four station monitoring network located north of the SF Bay Area in Sonoma County, it was clear the entire 35 year old network needed to be overhauled. Not only did equipment need replacing but the way in which data were collected, reviewed and reported needed modernizing as well. After extensive ...
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Seasonal and Diurnal Ozone Variations: Observations and Modeling
Ozone mixing ratios observed by the Bordeaux microwave radiometer between 1995 and 2002 in an altitude range 25–75 km show diurnal variations in the mesosphere and seasonal variations in terms of annual and semi-annual oscillations (SAO) in the stratosphere and in the mesosphere. The observations with 10–15 km altitude resolution are presented and compared to photochemical and transport model ...
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Evaluation of air pollution, local meteorology and urban public health
The relationship between meteorological conditions and air pollution was assessed as a plausible explanation for respiratory health problems in Newark, New Jersey on the US east coast. Pollutants in both particle (PM2.5 and PM10) and gas phase (O3) were collected and analysed. We find that PM2.5 concentrations decreased by -30.8% (95% CI: -43.2%, -15.8%) when the prevailing westerly wind speeds ...
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Neptune Project Deliverable D1.1 and D3.3
Strategies to minimize micropollutant release in plant effluent and Fate and occurrence of the selected analytes, microorganisms, viruses and mode of actions in relevant treatment processes Previous projects (e.g. the EU project Poseidon) showed that conventional wastewater treatment is an insufficient barrier to avoid the release of emerging micropollutants such as pharmaceuticals and personal ...
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Weekday/Weekend Differences in Ambient Air Pollutant Concentrations in Atlanta and the Southeastern United States
Abstract The authors quantified changes between mean weekday and weekend ambient concentrations of ozone (O3) precursors (volatile organic compounds [VOC], carbon monoxide [CO], nitric oxide, and oxides of nitrogen [NOx]) in Atlanta and surrounding areas to observe how weekend precursor emission levels influenced ambient O3 levels. The authors analyzed CO, nitric oxide (NO), and NOx ...
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Pretreatment of concentrated leachate by the combination of coagulation and catalytic ozonation with Ce/AC catalyst
A raw concentrated leachate produced from membrane bioreactor-nanofiltration (MBR-NF) was taken from Chengdu Chang'an Waste Landfill Site, China. The major fraction of this concentrated leachate was large refractory humic substances. A coagulation–ozonation process was applied to treat this leachate, aiming at enhancing chemical oxygen demand (COD) removal efficiency and increasing its ...
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FPI on the Day for Ozone Layer: Concise Solution Makes Big Progress
September 16th, World Ozone Day, is also known as the International Day for the Preservation of the Ozone Layer. The ozone layer is the second layer of the stratosphere, which is the mass of protective gases clinging to our planet. Protecting the ozone layer is for the good of every creature on the planet because of its great capability in trapping ultraviolet radiation (UV light), which may ...
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Saharan desert dust radiative effects: a study based on atmospheric modelling
This work investigates the Saharan desert storms direct effect, through the assessment of regional-scale Desert Dust (DD) aerosol Radiative Forcing (RF). Simulated parameters, obtained from atmospheric modelling, are used. The effect over different surfaces on the dust RF is analysed and the stratospheric ozone is considered. In the presence of DD aerosols, a shortwave cooling and a longwave ...
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Oxidative destruction of foaming agent, COD and TOC in wastewater using advanced oxidation technologies
In recent years, improvement in ozone based advanced oxidation process design and efficiency resulted in lower capital and operating costs. An investigation into alternatives for hard COD, TOC and foaming agent oxidative destruction which is economically attractive and do not generate sludge, lead to the evaluation of our ozone based advanced oxidation processes (AOP). The results of this pilot ...
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Studying Clouds in the Antarctic with Micro Pulse LiDAR
Researchers in the Australian Antarctic Science project collected aerosol data above the Southern Ocean to improve their understanding of the connection between clouds and climate change. Evaporation and condensation are the basic concepts leading to cloud formation; however, many factors impact the end results. In general, as water vapor molecules rise from the surface of the Earth, they ...
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