"Sewage and Sewage Treatment" Environment and Us PPT Download

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"Sewage and Sewage Treatment" Environment and Us PPT Download

Part 1: Importing new lessons

In the face of shortage of fresh water resources, water pollution poses a threat to humans and other organisms. Most water pollution is caused by human activities.

What human activities cause water pollution? How should wastewater be treated before it can be reused? Let's go into the lesson "Sewage and Sewage Treatment".

Sewage and sewage treatment PPT, part 2: exploring new knowledge

Observe and compare tap water and domestic sewage

Clean tap water becomes sewage after being used for washing your face, brushing your teeth, doing laundry, and mopping the floor.

Take a cup of domestic sewage and a cup of tap water each and observe and compare. What are the different among its?

Comparing the water before and after purification, what is the difference?

After purification, it becomes clearer than before purification.

After sedimentation and filtration, has the original sewage reached the level of cleanliness of tap water?

No, in addition to sedimentation and filtration, fresh water in the water plant also needs to be sterilized by adding drugs. This will comply with the standards we use.

Think: Where might the source of water pollution come from?

Discussion of pollution sources

Water pollution refers to the deterioration of clean water quality caused by human activities.

Pollution sources refer to the sources of pollutants that cause environmental pollution, usually pointing to places, equipment, devices or human bodies that discharge harmful substances into the environment or have harmful effects on the environment.

Sewage and sewage treatment PPT, part three: expansion and extension

Household simple water purifier

Activated carbon has a large specific surface area and can adsorb impurities in water. After drinking water is filtered through activated carbon, harmful substances can be removed, significantly improving the water quality.

This activity makes a simple water purifier to improve water quality.

Materials: drill, scissors. Plastic Coke bottle, gauze rope, faucet cover, rubber tube, gauze, rubber stopper, activated carbon, ABS glue, medical stone, glass catheter, tape paper.

activity procedure

1. Take a plastic Coke bottle, remove the hard base at the bottom, drill a dozen small holes in the bottom of the bottle with a red-hot drill, and plug a rubber stopper with a glass tube into the bottle mouth to make a filter!

2. Take another plastic Coke bottle, cut off the part with the hard seat, drill a small hole in the bottle cap as a water outlet, and make a container.

3． Apply a 3 cm wide piece of ABS glue on bottle A 15 to 18 cm away from the bottom of the bottle. Apply ABS glue with a width of 4cm on the inner wall of the bottom of bottle B. After the glue dries slightly, put bottle A with a layer of gauze at the bottom into bottle B, use transparent tape to stick the joint between the two bottles, and use gauze rope to reinforce it.

4. Connect a rubber tube to one end of the glass tube in bottle A, and connect the other end of the rubber tube to the faucet cover.

5. Put 500g activated carbon into bottle A, put 10g medical stone into bottle B, and cover the water outlet with a layer of gauze, and a simple water purifier is made.

Sewage and sewage treatment PPT, part 4 content: summary of this lesson

1. In the case of shortage of fresh water resources, water pollution poses a threat to humans and other organisms. Most water pollution is caused by human activities.

2. Precipitation and filtration can separate impurities in water.

3. Water pollution refers to the deterioration of clean water quality caused by human activities.

4. Understand wastewater treatment systems.

Sewage and sewage treatment PPT, part 5: exercises for this lesson

1. Judgment questions

1. The water used for washing clothes will not cause water pollution. ( )

2. Except for sedimentation and filtration, water treatment in water plants does not require sterilization. ( )

3. After effective treatment, wastewater can be returned to the environment harmlessly. Can be discharged into lakes, rivers and oceans, or seep into the ground. ( )

4. There are abundant fresh water resources now. ( )

2. Fill in the blanks

1. In the case of shortage of fresh water resources, ________ poses a threat to humans and other creatures.

2. Most water pollution is caused by _____________.

3. In addition to ________ and ________, fresh water in the water plant must also be added with drugs for __________, so that the water can meet the standards we use.

4. The tap water source in most areas comes from ________, ________ or ________.

3. Short answer questions

1. What human activities cause water pollution? (Involving at least three aspects)

Agricultural pollution: pesticides, fertilizers, etc.;

Industrial pollution: industrial sewage, oil pollution, etc.;

Domestic pollution: detergents, excrement, etc.

2. What methods are used to purify the reprocessing pool?

Physics (Filtering)

Biological method (bacterial decomposition)

Chemical method (chlorine disinfection)

Sewage and sewage treatment PPT, Part 6 content: Homework

Share, what kind of experience do you have after studying this course?

Keywords: Free download of science PPT courseware for the second volume of the sixth grade in the textbook edition, download of sewage and sewage treatment PPT, download of environment and us PPT, .PPT format;

For more information about the PPT courseware "Environment and Our Sewage and Sewage Treatment", please click the Environment and Our Sewage and Sewage Treatment ppt tag.

"Sewage and Sewage Treatment" Environment and Us PPT:

"Sewage and Sewage Treatment" Environment and Us PPT Part One Content: Observe and Compare Tap Water and Domestic Sewage Clean tap water becomes sewage after being used for washing faces, brushing teeth, washing clothes, and mopping the floor. Take a cup of domestic sewage and a cup of tap water each and observe and compare. they..

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Update Time: 2024-10-18

This template belongs to science courseware Science Edition for Sixth Grade Science Volume 2 industry PPT template

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