The discharge of warm water into the water bodies are usually called as thermal pollution. It occurs when industries like thermal power plants use the water from the water bodies for cooing turbines and return the waste hot water into it.
When the temperature of the water rises, it reduce the solubility of oxygen and change the ecological balance of the river.
Thermal pollution can be controlled by passing the heated water through a cooling pond or cooling tower after it leave the machine. The heat is dissipated into the air and then the water can be discharged into the water bodies.
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