"Development, Utilization and Protection of Water Resources" The most common liquid - water PPT courseware 2

Description

"Development, Utilization and Protection of Water Resources" The most common liquid - water PPT courseware 2

learning target:

1. Understand the status of water resources in the world and in my country, and the sources and hazards of water pollution.

2. Understand that water is a precious natural resource and know how to deal with water crises.

Key point: Know how to care for water resources

(1) Why is it said that water resources are both abundant and scarce?

(2) What are the causes of water shortage?

(3) Tell us about the water resources situation in the world and in my country?

Overview of my country’s water resources:

Total water resources: 2.7 ×1012m3. A country rich in water resources. Ranked sixth in the world in total.

Per capita occupancy: 2500m3. About a quarter of the world's per capita water.

Water scarcity: mild water shortage. There is an extreme shortage of water in many places.

Water quality: partial improvement. Overall, there is a worsening trend, and the outlook is not optimistic.

How to save water?

in life:

(1) After using face wash, you can wash your feet and then flush the toilet.

(2) Rice washing water and water used to cook noodles can be used to wash dishes and chopsticks to remove oil and save water.

(3) The water used for fish farming can promote the growth of flowers and trees.

(4) A leaking faucet can consume 70 liters of water per day; to avoid waste, it should be repaired immediately.

Industry: Improving water reuse

If the national industrial water reuse rate increases from 20% to 40%, 1.3×107t of water can be saved every day

Water pollution: refers to a situation where a large amount of pollutants are discharged into a water body, exceeding the self-purification capacity of the water body, causing the water quality to deteriorate, destroying the ecological balance of the water body and its surroundings, and causing losses and threats to human health, life and production activities.

Main sources of water pollution: industrial pollution, agricultural pollution, domestic pollution

1. Minamata Disease Incident From 1953 to 1972, organic mercury pollution occurred in Minamata City, Japan, killing more than 100 people. The patient is deaf, blind, numb in his limbs, mentally disturbed, and screams in pain.

2. Pain disease incident From 1955 to 1979, cadmium contaminated water bodies occurred in the Jintsu River basin in Japan. The patient's cough can even lead to fractures, severe bone deformation, and tragic death in severe pain.

3. Rhine River Pollution Incident In 1986, a warehouse of the Zanderz Chemical Company in Basel, Switzerland exploded and caught fire. A large amount of chemicals flowed into the Rhine River, causing the largest pollution accident in Western Europe in 10 years, affecting some areas in France, Germany, Finland, Rwanda and other countries. River water, well water, tap water, the Rhine River has been "dead" for more than 20 years.

How to prevent and control water pollution?

Measures to prevent and control water pollution:

a. Apply new technologies and new processes to reduce the generation of pollutants, and industrial wastewater should be treated to meet standards before being discharged.

b. Rational use of pesticides and chemical fertilizers in agriculture, and promotion of the use of farmyard manure

c. Do not use phosphorus-containing laundry detergent. Domestic wastewater must be treated to meet standards before being discharged.

The difference between water pollution, air pollution and soil pollution

Water pollution refers to a situation where a large amount of pollutants are discharged into a water body, exceeding the self-purification capacity of the water body, causing the water quality to deteriorate, destroying the ecological balance of the water body and its surroundings, and causing losses and threats to human health, life and production activities.

Atmospheric pollution, also known as air pollution, refers to the entry of certain substances into the atmosphere due to human activities or natural processes, showing a sufficient concentration for a sufficient period of time, and thereby endangering the comfort, health and welfare of the human body or the environment. Phenomenon.

Soil pollution refers to the phenomenon in which harmful substances discharged during human production and living activities enter the soil, directly or indirectly endangering the health of humans and animals.

practise

1. Water is the source of life, both common and precious. Which of the following descriptions of "more" and "less" water is wrong ( )

A The total amount of water on the earth is large, but fresh water is small.

B my country has a large amount of total water resources but a small amount of water per capita.

C The "South-to-North Water Diversion" project shows that there are more water reserves in the south and less water reserves in the north.

D There are many countries with abundant water resources in the world, but few countries with water resources shortage.

2. The following practices in daily life are not conducive to saving water ( )

A Water the flowers with rice water

B Flush the toilet with washed water

C. Pour away the overnight boiled water directly.

D Turn off the faucet temporarily while washing hands and applying soap

3. Which of the following statements is wrong ( )

A Water is widely distributed in nature, accounting for about 3/4 of the earth's surface area

B Water in animals and plants and in the atmosphere plays a role in maintaining physiological activities and climate.

C All colorless and transparent water is drinkable

D Water is not infinite, so we must save water

4. Three-quarters of our earth's surface is covered by water, but more than 2 billion people in the world are facing a freshwater crisis. Reducing pollution and saving water are important measures to solve this crisis. please answer the following question:

(1) The main sources of water pollution are ________, ________, and agricultural pollution.

(2) List two ways to save water: _________, _______________.

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"Development, Utilization and Protection of Water Resources" the most common liquid - water PPT courseware:

"Development, Utilization and Protection of Water Resources" The most common liquid water PPT courseware 1. Care and care for water resources 1. Overview of Earth's water resources ① The total amount of water is a lot: There are about 1.391018m3 of water on the earth, and about 71% of the earth's surface Covered by water. Ocean water storage accounts for all...

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Update Time: 2024-10-02

This template belongs to Chemistry courseware Beijing Curriculum Reform Edition Ninth Grade Chemistry Volume 1 industry PPT template

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