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

Description

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

Huaihe River water pollution control

The pollution of 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. In the 1990s, serious water shortages occurred in Bengbu, Huainan, Xuyi and other places. Local people said that the water quality of the Huaihe River has changed as follows: "In the 1950s, rice was washed and vegetables were washed, in the 1960s, laundry was irrigated, in the 1970s, the water quality deteriorated, and in the 1980s, fish and shrimp became extinct."

Blue algae outbreak in Dianchi Lake

On June 24, 2007, due to the sultry weather in the past few days, blue algae bloomed in Dianchi Lake. On the shore of the Dianchi Lake ridge in Kunming, the lake water looked like green paint. The rolling green water of the lake rushed to the shore, bringing waves of fishy smell. Dianchi Lake is the most polluted among the nine plateau lakes in Yunnan. The current water quality is worse than Class VI. The temperature rise every summer, coupled with serious eutrophication, will cause the outbreak of blue algae and cause serious pollution.

Yellow River water pollution

According to statistics from relevant departments, in the past 20 years, the amount of sewage discharged from the Yellow River has doubled, more than a dozen important tributaries have become "sewage ditches", and nearly 40% of the main river sections have lost their water body functions.

What is water pollution? Why does water pollution occur?

Concept: Water pollution refers to the intervention of a certain substance in a water body that exceeds the self-purification capacity of the water body, resulting in changes in its chemical, physical, biological and other characteristics, thereby affecting the use value of water, endangering human health or damaging Ecological environment, resulting in deterioration of water quality.

Causes: Industrial, agricultural and domestic sewage mostly contain nitrogen and phosphorus. A large amount of this sewage is discharged into rivers and lakes, causing algae to multiply in the water, eutrophication of the water body, and the oxygen content in the water to decrease, causing fish to die due to lack of oxygen, and the water body to turn into smelly water.

Eutrophication of water bodies is the most common phenomenon of water pollution

What are the dangers of long-term drinking of contaminated water?

Will using heavily polluted water for irrigation have any impact on human health?

Tip: Long-term drinking of contaminated water can cause acute or chronic poisoning, cancer, etc. in the human body. Too high a concentration of pollutants in irrigation water will mutate crop species and even lead to widespread crop death. Water pollution will also change the aquatic ecosystem, and aquatic organisms that cannot adapt to the new environment will die in large numbers, making the aquatic ecosystem increasingly simpler and more fragile.

【Self-learning】

Read the text of the textbook and answer the questions

1. What are the principles for preventing and controlling water pollution? and explain its meaning.

2. What is the most effective control method for industrial pollution sources?

3. What is cleaner production?

4. What does scientific management include?

(1) The principles of water pollution prevention and control are prevention, treatment and management.

Prevention mainly refers to reducing the amount of pollutants emitted by pollution sources to the minimum through effective control.

Treatment involves building urban sewage treatment plants to ensure that sewage reaches national or local discharge standards before being discharged into natural water bodies.

Management refers to the management of pollution sources, water bodies and treatment facilities to promote treatment.

(2) For industrial pollution sources, the most effective control method is to promote cleaner production.

(3) Cleaner production includes improving raw material selection and product design, replacing toxic and harmful raw materials and products with non-toxic and low-harm raw materials and products; reducing the consumption of raw materials, water and energy; using physical, chemical and other methods to recycle wastewater Useful ingredients to reduce the concentration of pollutants in wastewater.

(4) Scientific management includes monitoring and management of pollution sources, sewage treatment plants and water body health characteristics.

【Practice】

Due to economic constraints in small towns and rural areas in my country, it is impossible to copy the sewage treatment model of building sewage treatment plants in big cities to treat domestic sewage. According to surveys, domestic sewage in small towns and rural areas is mainly rich in nitrogen, phosphorus, potassium and other elements, and nitrogen, phosphorus, potassium and other elements are essential nutrients for the growth of aquatic organisms. Please find examples of resource utilization and harmless treatment of domestic sewage in small towns and rural areas in my country, and talk about how to treat domestic sewage in small towns and rural areas.

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

"Water Pollution and Its Prevention and Control" Resource Protection and Environmental Crisis PPT Courseware Current Situation 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 prevention of water pollution Governance becomes modern...

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Update Time: 2024-07-06

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

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