Talk about the harm of water pollution?

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Pollutants in water are not only important factors affecting water quality, but also important factors affecting ecological environment and people's health. Water pollution can be divided into biological pollution, chemical pollution and physical contamination.

First, the harm of biological pollution

(A) the harm of biological pathogen pollution

The most common pathogenic bacteria in water are mainly divided into four categories: ① pathogenic bacteria: such as typhoid Bacillus, paratyphoid Bacillus, dysentery Bacillus, etc. ② Pathogenic viruses: hepatitis A and E virus, rotavirus; ③ Parasites: such as Entamoeba histolytica and Schistosoma japonicum; ④ Others: including Chlamydia trachomatis and Leptospira.

Residents exposed to the above pathogens through drinking water, food and entertainment may cause the occurrence and prevalence of related diseases, thus causing harm to health.

(2) Harm of microcystins in water

In recent years, the harm of water eutrophication has aroused widespread concern. Algae accumulation in eutrophic water will affect the sensory characteristics of water and make it smelly. Algae can also block the gills of aquatic organisms and suffocate them; Some algae can produce toxins, such as paralytic shellfish toxins and diarrheal shellfish toxins. Shellfish may be rich in toxins, and people will be poisoned after eating shellfish.

Second, the harm of chemical pollution

The direct discharge of industrial wastewater and domestic sewage into water body without treatment is the main cause of chemical pollution of water body. Toxic chemicals in wastewater, such as mercury, arsenic, polychlorinated biphenyls and pesticides, can spread through drinking water or food chain and cause acute and chronic poisoning.

Third, the harm of physical contamination.

thermal pollution

Thermal pollution mainly comes from the cooling water of the factory. The discharge of hot wastewater raises the water temperature, increases the reaction rate in water, and increases the toxic effect of toxic substances in water on aquatic animals.

(2) Radioactive pollution

The influence of radioactive substances on human body, in addition to the toxicity of nuclides themselves, is mainly the radiation damage to organs caused by rays with different energies released during decay.

The above is the harm of water pollution, and I hope it will be helpful to everyone's study. For more preparation materials and recruitment information, please continue to pay attention to Zhonggong Qinghai Health Talent Network!