4
Question
In a scrubber, the exhaust is passed through a spray of ____________.
In a scrubber, the exhaust is passed through a spray of ____________.
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Solution
The correct option is A water or lime
Environmental pollution is referred to as the addition of substances to the environment that can cause undesirable changes in its physical, chemical or biological characteristics.
Air pollution occurs when pollutants such as gaseous (oxides of sulphur, nitrogen) and particulate matter (dust, soot) are added to the air.
Scrubbers are air pollution control devices that use liquid to remove particulate matter or gases like sulphur dioxide which are present in exhausts from thermal power plants, industries, etc.
Scrubber consists of a tower-like structure with nozzles to spray lime or water. Dirty air containing particulate matter is passed into the tower. As the flue gases in the tower rise up, it is made to pass through a spray of water or lime. Hence option a is correct.
Sulphur dioxide present in flue gases (exhaust gas) reacts with water or lime solution to form calcium sulphite. Thus sulphur dioxide is collected as calcium sulphite and removed from the scrubbing tower. Clean air from particulate matter leaves the tower from top and is let out to the atmosphere through smokestacks (a chimney or funnel for discharging smoke).
Acids like hydrochloric acid and sulphuric acid are generally not used in scrubbers. Hence options b, c and d are incorrect.
Environmental pollution is referred to as the addition of substances to the environment that can cause undesirable changes in its physical, chemical or biological characteristics.
Air pollution occurs when pollutants such as gaseous (oxides of sulphur, nitrogen) and particulate matter (dust, soot) are added to the air.
Scrubbers are air pollution control devices that use liquid to remove particulate matter or gases like sulphur dioxide which are present in exhausts from thermal power plants, industries, etc.
Scrubber consists of a tower-like structure with nozzles to spray lime or water. Dirty air containing particulate matter is passed into the tower. As the flue gases in the tower rise up, it is made to pass through a spray of water or lime. Hence option a is correct.
Sulphur dioxide present in flue gases (exhaust gas) reacts with water or lime solution to form calcium sulphite. Thus sulphur dioxide is collected as calcium sulphite and removed from the scrubbing tower. Clean air from particulate matter leaves the tower from top and is let out to the atmosphere through smokestacks (a chimney or funnel for discharging smoke).
Acids like hydrochloric acid and sulphuric acid are generally not used in scrubbers. Hence options b, c and d are incorrect.
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