From the perspective of pollution sources, water pollution includes physical, chemical and biological pollution.
1. Physical water pollution: thermal pollution, such as cooling water discharged from factories and power plants, color vision pollution, pollution olfactory and transparency pollution, etc. ;
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2. Chemical water pollution: including various organic and inorganic compounds, heavy metal pollution, acid and alkali pollution;
3; . Biological water pollution: such as algae and bacterial outbreaks caused by eutrophication of water bodies, toxic bacteria in hospital wastewater, and coliform contamination of drinking water caused by poor management of feces.