How much harm does water pollution cause?

Water pollution leads to the reduction or extinction of organisms, reduces the value of various environmental resources, and destroys the ecological balance. If people drink contaminated water, it can cause acute and chronic poisoning, cancer, infectious diseases and other strange diseases.

Under normal conditions, oxygen has a certain solubility in water. Dissolved oxygen is not only a condition for the survival of aquatic organisms, but also an important reason why natural water has the ability to self-purify by participating in various oxidation reactions in water and promoting the transformation and degradation of pollutants. The discharge of domestic sewage containing a large amount of nitrogen, phosphorus and potassium will reduce a large amount of organic matter in the water to release nutrients, promote the growth of algae in the water, the growth of plants, the poor ventilation of the water body, the decline of dissolved oxygen, and even the appearance of an oxygen-free layer.

As a result, a large number of aquatic plants die, the water surface turns black, and the water body stinks to form "dead lakes", "dead rivers", "dead seas", and then turn into swamps. This phenomenon is called eutrophication of water. There are many bacteria in the water of eutrophication, and the water quality of this water is poor, and it cannot be used directly, and the water is interrupted and a large number of fish die.

There are three aspects to the harm of water pollution.

1. The harm of the collapsed stool to the environment leads to the reduction or extinction of organisms, resulting in the reduction of the value of resources in various travel environments, and destroying the ecological balance.

2. Harm to production, polluted water can not meet the requirements of industrial production or agricultural irrigation, resulting in reduced production.

3. Harm to people, if people drink polluted water, it will cause acute and chronic poisoning, cancer, infectious diseases and some other strange diseases, and the sensory deterioration caused by polluted water will cause inconvenience to people's lives, and their emotions will be affected by bad influences.

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Water pollution will directly cause six major harms, namely: endangering human health, reducing crop yield and quality, affecting fishery production, affecting industrial development, endangering the ecological environment, and causing economic losses.

1. Endangering human health, water pollution directly affects the water quality of drinking water sources. When drinking water sources are contaminated with synthetic organic compounds, it will lead to the occurrence of ascites, diarrhea, hepatitis, gastric cancer, liver cancer and other diseases. Contact with unclean water can also contract diseases such as ** disease, trachoma, schistosomiasis, hookworm and so on.

Some toxic and harmful substances in wastewater, even if the quantity is not large, or even difficult to detect, can still cause fatal harm to the human body due to the enrichment of animals and plants and the accumulation of the human body itself.

2. Reduce the yield and quality of crops, the water in rivers and lakes is often the source of farmland irrigation water, once these water bodies are polluted, the toxic and harmful substances in the water will pollute the farmland soil, be absorbed by crops and remain in the crops. On the one hand, it causes crops to wilt and die, and the yield decreases; On the other hand, the quality of crops will also decline to varying degrees, such as excessive pollutants, reduced content of nutrients such as proteins, amino acids and vitamins, and peculiar smells of vegetables.

3. Affect fishery production, which is closely related to water quality. Water pollution often causes large-scale fish deaths in freshwater fisheries. Some heavily polluted sections of the river have become extinct.

Water pollution can also mutate fish and aquatic organisms, accumulate toxic substances in the fish, and greatly reduce the food value.

4. Restricting the development of industry, many industries (such as food, textile, papermaking and electroplating, etc.) need water, and the deterioration of water quality will directly affect product quality. For example, poor water quality cooling water will cause blockage, corrosion and scaling of the water circulation system, and water with high hardness will affect the life and safety of the boiler.

5. Accelerate the degradation and destruction of the ecological environment, water pollution not only harms the aquatic organisms in the water body, but also has an impact on the ecological environment around the water body. After pollution, the perception of the water body deteriorates, emitting odor, and the pollutants in the water have a toxic effect on the surrounding organisms, and the organisms die, resulting in the degradation and destruction of the ecological environment.

6. Causing economic losses, water pollution causes the environment to lose some or all of its original functions, resulting in the degradation and depreciation of the environment, which brings harm to human survival and economic development, and monetizes these harms as economic losses caused by water pollution. If human health is endangered, the labor force will be reduced, labor productivity will be reduced, more medical expenses will be paid for frequent diseases, and the reduction of fish production or poor quality will directly cause economic losses, and the cost of pollution control and restoration of the ecological environment will increase with the aggravation of pollution.