Māris kļaviņŠ, azamat azizov, JĀnis zaļoksnis environment, pollution, development: the case of uzbekistan

particles. This method is considered to be one of the best 
from the gas cleaning efficiency point of view, while at the 
same time it is a costly operation, which results in formation 
of liquid waste that need to be disposed of, and the use of 
such approach is not always well founded. 
5)  Electrostatic purification. The exhaust fumes can be purified, 
first of all, by charging them during gas flow through the DC 
high voltage electrical discharge zone, and then through two 
electrodes. Negatively charged dust and aerosol particles are 
held up at the positive electrode. This method is effective and 
inexpensive, and it can be used continuously.
Purified air
Dust
Inlet air
Dust filter
Current
source
Electrodes
Spray
Removal of
aerosols
a
b
d
c
Figure 7.20. 
Polluted 
air treatment solutions 
from dust and aerosols: 
a – cyclone; b – dust 
filter; c – scrubber; 
d – the electrostatic 
coagulation

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ENVIRONMENT, POLLUTION, DEVELOPMENT:  THE CASE OF UZBEKISTAN
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Sedimentation tank
Cyclone
Scrubber
Dust filter
Electrostatic precipitation