One option is to use coal that contains less sulfur . Another option is to “wash” the coal to remove some of the sulfur. The power plant can also install equipment called scrubbers, which remove the sulfur dioxide from gases leaving the smokestack.
How can SO2 be removed?
In flue gas cleaning processes, SO2 is usually removed by absorption with lime (CaOH2·2H2O) or other compounds having high alkalinity. ... SO2 is therefore removed from the atmosphere either unchanged or in the form of sulphuric acid and sulphates.
How can Sulphur dioxide be controlled by pollution?
The two major emissions control methods are sorbent injection and flue gas desulfurization : Sorbent injection involves adding an alkali com- pound to the coal combustion gases for reac- tion with the sulfur dioxide. Typical calcium sorbents include lime and variants of lime. Sodium-based compounds are also used.
What are 3 ways to reduce acid rain?
Instead, we can use renewable energy sources , like solar and wind power. Renewable energy sources help reduce acid rain because they create much less pollution. There are also other sources of electricity, such as nuclear power, hydropower, and geothermal energy. Of these, nuclear and hydropower are used most widely.
What are the 3 ways to reduce sulfur dioxide?
- improved efficiency of conversion of fuel to electricity (this would reduce pollutant emissions per unit of electricity generated);
- shift to nuclear generation as rapidly as possible since no sulfur oxide (or particulate) is emitted from nuclear plants;
- shift fossil fuel plants to lower sulfur fuels;
What is acid rain Its Causes effects and solutions?
Acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air . These substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.
How is Sulphur dioxide removed from water?
Chlorine bleach can effectively remove medium to high levels (over 6 mg/l) of hydrogen sulfide. The chlorine in the bleach chemically reacts with (oxi- dizes) the hydrogen sulfide eliminating the “rotten egg” odor. Chlorine bleach also reacts with iron or manganese, and disinfects water supplies.
How do you neutralize SO2 gas?
NaOH neutralizes the absorbed SO2, producing a mixture of soluble sodium salts. The carefully chosen packing material provides a large surface area for reaction. The scrubbing liquid, SO2 in solution, and salts fall into the tank and are removed.
What chemical removes SO2 from flue gas?
SNOX Flue gas desulfurization removes sulfur dioxide, nitrogen oxides and particulates from flue gases; Dry sorbent injection systems that introduce powdered hydrated lime (or other sorbent material) into exhaust ducts to eliminate SO2 and SO3 from process emissions.
What removes SO2 from flue gas?
For the removal of SO 2 from flue gas, a wet process using calcium carbonate as an absorbent is most commonly adopted in commercial plants. The wet process shows a high efficiency but needs a large amount of water. SO 2 is fixed in the form of calcium sulfate.
What are the harmful effects of Sulphur dioxide?
Health effects
Sulfur dioxide affects the respiratory system, particularly lung function, and can irritate the eyes. Sulfur dioxide irritates the respiratory tract and increases the risk of tract infections. It causes coughing, mucus secretion and aggravates conditions such as asthma and chronic bronchitis.
Is Sulphur dioxide good for health?
Sulphur dioxide is widely used in the food and drinks industries for its properties as a preservative and antioxidant . Whilst harmless to healthy persons when used in recommended concentrations, it can induce asthma when inhaled or ingested by sensitive subjects, even in high dilution.
What is the main reason of thermal pollution?
A common cause of thermal pollution is the use of water as a coolant by power plants and industrial manufacturers . When water used as a coolant is returned to the natural environment at a higher temperature, the sudden change in temperature decreases oxygen supply and affects the ecosystem.
What neutralizes acid rain?
Limestone Neutralization :
Alkaline or basic soils, such as those rich in limestone, calcium carbonate, can neutralize the acid directly.
What is acid rain write its effects?
Acid rain results when sulfur dioxide (SO 2 ) and nitrogen oxides (NO X ) are emitted into the atmosphere and transported by wind and air currents . The SO 2 and NO X react with water, oxygen and other chemicals to form sulfuric and nitric acids. These then mix with water and other materials before falling to the ground.
What are 3 effects of acid rain?
Acid rain has been shown to have adverse impacts on forests, freshwaters, and soils, killing insect and aquatic life-forms, causing paint to peel, corrosion of steel structures such as bridges , and weathering of stone buildings and statues as well as having impacts on human health.
