Particulate matter is the most dangerous form of air pollution because it does not only affects the human health but also has an impact on the earth's climate and precipitation levels. This paper proposes an easy and cost efficient method to measure
ISPE Guidelines
ISPE Guidelines
Indoor pollution is degradation of indoor air quality by harmful chemical and other materials it are often up to 10 times worse than outdoor pollution. This is because contained areas enable potential pollutants to create up quite open spaces. Statis
ISPE GuidelinesDescription complète
Ventilation, Perfusion and Ventilation-Perfusion Relationships
iotFull description
Bioreactor use a natural process to survive in terms of it must have a source of energy (food) and water (moisture). In air bioreactor, moist air is passed through solid media having been previousl...
It is the responsibility of man to live in harmony with nature and all its living creatures while tapping the earth’s vast mineral resources so as to maintain and improve our essential needs…Full description
It is the responsibility of man to live in harmony with nature and all its living creatures while tapping the earth’s vast mineral resources so as to maintain and improve our essential needs. This ...
project
IBD/Lecture Notes
Maximum Mixing Depth The amount of air available to dilute pollutants is related to the wind speed and to the extent to which emissions can rise into the atmosphere. The maximum mixing depth (sometimes called the mixing height) is obtained by projecting the dry adiabatic lapse rate line to the point of intersection with the atmospheric temperature profile.
Neutral
Height
Stable Maximum mixing depth Unstable
Temperatur e
Tmax
The product of the maximum mixing depth and the average wind speed within the mixing depth is sometimes used as an indicator of the atmosphere’s dispersive capability. This product is known as the ventilation coefficient (m2/s). Values of ventilation coefficient less than about 6000 m2/s are considered indicative of high air pollution potential (Portelli and Lewis, 1987).
Sample Problems
EX1. Suppose the following atmospheric altitude versus temperature data have been collected. Altitude,
0
100
200
300
400
500
600
IBD/Lecture Notes
m Temp. OC
20
18
16
15
16
17
18
a) What would be the mixing depth? b) How high would you expect a plume to rise if it is emitted at 21 OC
from a 100-m stack if it rises at the dry adiabatic lapse rate? Would you expect the plume to be looping, coning, fanning, or fumigating?
EX2. For the temperature profile given in the previous problem, if the maximum daytime surface temperature is 22 OC, and a weather station anemometer at 10 m height shows winds averaging 4 m/s, what would be the ventilation coefficient? Assume stability class C and use the wind at the height halfway to the maximum mixing depth.
