"Water Pollution and its Prevention and Control" Resource Protection and Environmental Crisis PPT Courseware

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"Water Pollution and its Prevention and Control" Resource Protection and Environmental Crisis PPT Courseware

Current status of water pollution

Water resources are the most critical resources for human production and life. However, nowadays, the ecological environment has been severely damaged and water bodies are seriously polluted. The protection of water resources and the control of water pollution have become the most concerned issues in modern society. China is a country suffering from severe drought and water shortage.

Water resources distribution characteristics

The total amount is not abundant, and the per capita possession is even lower. China's total water resources rank sixth in the world, with a per capita share of 2,240 cubic meters, about 1/4 of the world's per capita. China ranks 88th among 153 countries continuously counted by the World Bank.

Yangtze River water pollution

River pollution refers to the deterioration of river water quality caused by pollutants discharged directly or indirectly into rivers. Its main features:

①The degree of pollution changes with the amount of runoff. When the amount of pollutant discharge is the same, the greater the river runoff, the lower the pollution level; seasonal changes in runoff bring about temporal differences in pollution levels. ② Pollutants diffuse quickly. The mobility of rivers means that the impact of pollution is not limited to the area where the pollution occurs. Pollution in the upstream will quickly affect the downstream. Even pollution in a section of the river can affect the ecological environment of the entire river (taking into account the migration of fish, etc.). ③Pollution is harmful. River water is the main source of drinking water. Pollutants can directly poison the human body through drinking water, and can also indirectly endanger human health through the food chain and irrigated farmland.

Yangtze River water pollution control

Since entering the "Ninth Five-Year Plan", my country's large-scale water pollution prevention and control has been fully launched in key river basins such as the "Three Rivers and Three Lakes" - Huaihe River, Taihu Lake, Chaohu Lake, Dianchi Lake, Haihe River, and Liaohe River. After several years of hard work, phased results have been achieved. The water quality of some river sections has improved. However, due to historical reasons, my country's water environment problems are relatively complex. Under the existing economic and technical conditions, solving water environment problems requires a slow process. Therefore, for a long period of time in the future , water pollution problems in key river basins will remain very serious.

Control the emergence of new water environment problems in decision-making

Control the emergence of new water environment problems in decision-making

Establish and improve the paid use system and price system of resources

Improve environmental economic policies

Vigorously promote cleaner production

Strengthen the prevention and control of non-point source pollution in rural areas

Accelerate urban sewage treatment and vigorously develop environmental protection industries

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"Water Pollution and Its Prevention and Control" Resource Protection and Environmental Crisis PPT Courseware 2:

"Water Pollution and Its Prevention and Control" Resource Protection and Environmental Crisis PPT Courseware 2 Huaihe River Water Pollution Control The pollution phenomenon in the Huaihe River is becoming increasingly serious. Since the 1980s, water pollution accidents in the Huaihe River have continued to occur, seriously affecting the production and domestic water supply of people along the coast. Entering the 1990s,...

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Update Time: 2024-11-25

This template belongs to science courseware People's Education Press Sixth Grade Science Volume 2 industry PPT template

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