formation and unburnt carbon particulates. With recent advancements, the combustion chamber of diesel engines is being designed to employ smarter electronic fuel
injection systems which are designed for precise injection and creates a homogenous
mix of fuel, such techniques are called active techniques (Shukla et al. 2018) and
effectively control the generation of pollutants. Also, passive techniques like after
treatment devices used in tail pipe of the vehicle help reduce the level of air pollution
to a level which satisfies the modern emission regulations. Such techniques involve
hydrocarbon particulate trap, selective catalytic reduction system and NO x
absorbers. Now considering the contamination of air due to industries, various
techniques can be employed to recycle and filter the flue gases generated during
any industrial process (Fig. 1.5).
Wet scrubbers (Bhargava 2016) are known to be an effective pollution control
device to arrest particle matter in the flue gases. There are different types of wet
scrubbers like chemical scrubbers/gas scrubbers, particulate scrubbers/venturi
scrubbers, Ammonia scrubbers and chlorine scrubbers and sulfuric acid scrubbers
Fig. 1.5 A diagram of wet scrubber. (Image downloaded from https://energyeducation.ca/
encyclopedia/Wet_scrubber on 13 December, 2019)
1 Environmental Pollution, Its Causes and Impact on Ecosystem
11
injection systems which are designed for precise injection and creates a homogenous
mix of fuel, such techniques are called active techniques (Shukla et al. 2018) and
effectively control the generation of pollutants. Also, passive techniques like after
treatment devices used in tail pipe of the vehicle help reduce the level of air pollution
to a level which satisfies the modern emission regulations. Such techniques involve
hydrocarbon particulate trap, selective catalytic reduction system and NO x
absorbers. Now considering the contamination of air due to industries, various
techniques can be employed to recycle and filter the flue gases generated during
any industrial process (Fig. 1.5).
Wet scrubbers (Bhargava 2016) are known to be an effective pollution control
device to arrest particle matter in the flue gases. There are different types of wet
scrubbers like chemical scrubbers/gas scrubbers, particulate scrubbers/venturi
scrubbers, Ammonia scrubbers and chlorine scrubbers and sulfuric acid scrubbers
Fig. 1.5 A diagram of wet scrubber. (Image downloaded from https://energyeducation.ca/
encyclopedia/Wet_scrubber on 13 December, 2019)
1 Environmental Pollution, Its Causes and Impact on Ecosystem
11