Q. Consider the following statements:
1.Coal ash contains arsenic, lead and mercury.
2.Coal-fired power plants release sulphur dioxide and oxides of nitrogen into the environment.
3.High ash content is observed in Indian coal.
Which of the statements given above is/are correct?
a) 1 only
b) 2 and 3 only
c) 3 only
d) 1, 2 and 3
Correct Answer : d) 1, 2 and 3
Question from UPSC Prelims 2020 GS Paper
Explanation:
Coal Ash and its Contaminants
Coal ash, the residue left after coal is burned, contains a variety of heavy metals, including arsenic, lead, and mercury. These substances are harmful to human health and the environment. If not properly managed, they can contaminate water sources and soil.
Pollutants Released by Coal-Fired Power Plants
When coal is burned in power plants, it releases various pollutants into the atmosphere. Among these pollutants are sulfur dioxide (SO2) and nitrogen oxides (NOx). SO2 contributes to acid rain and respiratory problems, while NOx plays a significant role in the formation of ground-level ozone and smog, also contributing to respiratory issues.
High Ash Content in Indian Coal
Indian coal is known for its high ash content, often ranging from 30% to 45%. This ash content is significantly higher than that found in coal from many other parts of the world. The high ash content poses challenges for combustion and pollution control in power plants. It also requires more sophisticated handling and disposal methods to manage the large volumes of ash produced.
