Mobile Lidar System for the Measurement of Gaseous Pollutants in Atmospheric Air

1979 ◽  
Author(s):  
C. Weitkamp ◽  
J. Harms ◽  
W. Lahmann ◽  
W. Michaelis
Keyword(s):  
Gaseous Pollutants ◽  
Lidar System ◽  
Atmospheric Air

scholarly journals Assessment of environmental impact of agricultural biogas plants

2018 ◽  
pp. 24-31
Author(s):  
Monika Janas ◽  
Alicja Zawadzka
Keyword(s):  
Anaerobic Fermentation ◽  
Water Environment ◽  
Comprehensive Analysis ◽  
Gaseous Pollutants ◽  
Potential Range ◽  
Fermentation Processes ◽  
Atmospheric Air ◽  
Biogas Plants ◽  
Solid Liquid ◽  
Soil And Water

Operation of biogas plants, anaerobic fermentation processes, collection and purification of biogas and its subsequent combustion may be a source of environmental hazard. The construction and operation of biogas plants is inextricably connected with the generation and emission of solid, liquid and gaseous pollutants into the environment. The aim of the work is to analyze environmental hazards resulting from the construction and operation of biogas plants. As part of the work, a comprehensive analysis of their impact on individual components of the environment was made. The effect of biogas plants on atmospheric air, soil and water environment and acoustic climate was analyzed and the potential range of these impacts was presented.

scholarly journals Changes in the pollution of Lodz voivodship rainwater as a result of changes in pollutant immissions

2019 ◽  
pp. 31-37 ◽  
Author(s):  
Justyna Czerwińska ◽  
Grzegorz Wielgosiński
Keyword(s):  
Heavy Metals ◽  
Air Quality ◽  
Surface Water ◽  
Plant Protection ◽  
Atmospheric Precipitation ◽  
Plant Protection Products ◽  
Pollutant Emissions ◽  
Gaseous Pollutants ◽  
Atmospheric Air ◽  
Sanitary Condition

Increasing urbanization rates, particularly in cities, cause an increase in pollutant emissions into the environment. Immission of pollutants is the amount of particulate or gaseous pollutants that is received by the environment. Natural precipitation, i.e. rainwater, is polluted during the contact with air. As a result of atmospheric precipitation groundwater and soil become polluted. The pollutants also penetrate surface water, causing further contamination. In rainwater that goes to the sewage system, there are pollutants such as hydrocarbons, heavy metals, slurries, plant protection products and many more. This is largely dependent on the type of management of the catchment, its sanitary condition, and the time and intensity of precipitation. Another important factor is the composition of pollutants emitted into the atmospheric air in each area. The work shows changes in the pollution of rainwater in Lodz Voivodship in the years 2010-2016 and presents analysis of the data collected by the Regional Inspectorate for Environmental Protection. The analysis shows that the state of rainwater is steadily deteriorating which is directly related to air quality.

Mobile lidar system for monitoring of gaseous pollutants in atmosphere over industrial and urban area

1999 ◽  
Author(s):  
Irina V. Moskalenko ◽  
Djolinard A. Shecheglov ◽  
Aleksei P. Rogachev ◽  
Aleksandr A. Avdonin ◽  
Nikolai A. Molodtsov
Keyword(s):  
Urban Area ◽  
Gaseous Pollutants ◽  
Lidar System

Photo-catalytic degradation of gaseous pollutants in paper mills of southern China

TAPPI Journal ◽  
2018 ◽  
Vol 17 (03) ◽  
pp. 167-178 ◽  
Author(s):  
Xin Tong ◽  
Jiao Li ◽  
Jun Ma ◽  
Xiaoquan Chen ◽  
Wenhao Shen
Keyword(s):  
Degradation Rate ◽  
Southern China ◽  
Catalytic Degradation ◽  
Pulp And Paper ◽  
Gaseous Pollutants ◽  
Pulp And Paper Mills ◽  
Paper Mills ◽  
Initial Concentration ◽  
First Order ◽  
First Order Kinetics

Studies were undertaken to evaluate gaseous pollutants in workplace air within pulp and paper mills and to consider the effectiveness of photo-catalytic treatment of this air. Ambient air at 30 sampling sites in five pulp and paper mills of southern China were sampled and analyzed. The results revealed that formaldehyde and various benzene-based molecules were the main gaseous pollutants at these five mills. A photo-catalytic reactor system with titanium dioxide (TiO2) was developed and evaluated for degradation of formaldehyde, benzene and their mixtures. The experimental results demonstrated that both formaldehyde and benzene in their pure forms could be completely photo-catalytic degraded, though the degradation of benzene was much more difficult than that for formaldehyde. Study of the photo-catalytic degradation kinetics revealed that the degradation rate of formaldehyde increased with initial concentration fitting a first-order kinetics reaction. In contrast, the degradation rate of benzene had no relationship with initial concentration and degradation did not conform to first-order kinetics. The photo-catalytic degradation of formaldehyde-benzene mixtures indicated that formaldehyde behaved differently than when treated in its pure form. The degradation time was two times longer and the kinetics did not reflect a first-order reaction. The degradation of benzene was similar in both pure form and when mixed with formaldehyde.

WET BURNING – THE MODERN TREND IN ENVIRONMENTAL BENIGN FUEL COMBUSTION AND IN SOLUTION TO THE PROBLEM OF SUSTAINABLE DEVELOPMENT OF THE POWER GENERATION

2018 ◽  
pp. 96-117 ◽  
Author(s):  
B. S. Soroka
Keyword(s):  
Numerical Simulation ◽  
Nitrogen Oxides ◽  
Chemical Kinetics ◽  
Fuel Combustion ◽  
Transport Processes ◽  
Cfd Modeling ◽  
Furnace Chamber ◽  
Modern Trend ◽  
Atmospheric Air ◽  
No Formation

The article considers the role and place of water and water vapor in combustion processes with the purpose of reduction the effluents of nitrogen oxides and carbon oxide. We have carried out the complex of theoretical and computational researches on reduction of harmful nitrogen and carbon oxides by gas fuel combustion in dependence on humidity of atmospheric air by two approaches: CFD modeling with attraction of DRM 19 chemical kinetics mechanism of combustion for 19 components along with Bowman’s mechanism used as “postprocessor” to determine the [NO] concentration; different thermodynamic models of predicting the nitrogen oxides NO formation. The numerical simulation of the transport processes for momentum, mass and heat being solved simultaneously in the united equations’ system with the chemical kinetics equations in frame of GRI methane combustion mechanism and NO formation calculated afterwards as “postprocessor” allow calculating the absolute actual [CO] and [NO] concentrations in dependence on combustion operative conditions and on design of furnace facilities. Prediction in frame of thermodynamic equilibrium state for combustion products ensures only evaluation of the relative value of [NO] concentration by wet combustion the gas with humid air regarding that in case of dry air – oxidant. We have developed the methodology and have revealed the results of numerical simulation of impact of the relative humidity of atmospheric air on harmful gases formation. Range of relative air humidity under calculations of atmospheric air under impact on [NO] and [CO] concentrations at the furnace chamber exit makes φ = 0 – 100%. The results of CFD modeling have been verified both by author’s experimental data and due comparing with the trends stated in world literature. We have carried out the complex of the experimental investigations regarding atmospheric air humidification impact on flame structure and environmental characteristics at natural gas combustion with premixed flame formation in open air. The article also proposes the methodology for evaluation of the nitrogen oxides formation in dependence on moisture content of burning mixture. The results of measurements have been used for verification the calculation data. Coincidence of relative change the NO (NOx) yield due humidification the combustion air revealed by means of CFD prediction has confirmed the qualitative and the quantitative correspondence of physical and chemical kinetics mechanisms and the CFD modeling procedures with the processes to be studied. A sharp, more than an order of reduction in NO emissions and simultaneously approximately a two-fold decrease in the CO concentration during combustion of the methane-air mixture under conditions of humidification of the combustion air to a saturation state at a temperature of 325 K.

Electrical Characteristics of Atmospheric Air Corona Plasma by Multi-pin Electrodes

2019 ◽  
Vol 14 (3) ◽  
pp. 226
Author(s):  
Khanit Matra ◽  
Yottana Tanakaran ◽  
Teerawat Temponsub ◽  
Suphanat Nimbua ◽  
Phanuwat Thab-in ◽  
...  
Keyword(s):  
Electrical Characteristics ◽  
Atmospheric Air ◽  
Corona Plasma

Registration and Fusion of UAV LiDAR System Sequence Images and Laser Point Clouds

2020 ◽  
Author(s):  
Jiayong Yu ◽  
Longchen Ma ◽  
Maoyi Tian, ◽  
Xiushan Lu
Keyword(s):  
Point Cloud ◽  
Image Data ◽  
Point Clouds ◽  
Optical Image ◽  
Point Cloud Data ◽  
Feature Points ◽  
Lidar System ◽  
Registration Accuracy ◽  
Cloud Data ◽  
Intensity Image

The unmanned aerial vehicle (UAV)-mounted mobile LiDAR system (ULS) is widely used for geomatics owing to its efficient data acquisition and convenient operation. However, due to limited carrying capacity of a UAV, sensors integrated in the ULS should be small and lightweight, which results in decrease in the density of the collected scanning points. This affects registration between image data and point cloud data. To address this issue, the authors propose a method for registering and fusing ULS sequence images and laser point clouds, wherein they convert the problem of registering point cloud data and image data into a problem of matching feature points between the two images. First, a point cloud is selected to produce an intensity image. Subsequently, the corresponding feature points of the intensity image and the optical image are matched, and exterior orientation parameters are solved using a collinear equation based on image position and orientation. Finally, the sequence images are fused with the laser point cloud, based on the Global Navigation Satellite System (GNSS) time index of the optical image, to generate a true color point cloud. The experimental results show the higher registration accuracy and fusion speed of the proposed method, thereby demonstrating its accuracy and effectiveness.

Measurements of KrF laser-induced O2 fluorescence in high-temperature atmospheric air

1993 ◽  
Author(s):  
JAY GRINSTEAD ◽  
GABRIEL LAUFER ◽  
JAMES MCDANIEL, JR.
Keyword(s):  
High Temperature ◽  
Atmospheric Air ◽  
Krf Laser
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