"Sewage and Sewage Treatment" Environment and Us PPT Courseware

Description

"Sewage and Sewage Treatment" Environment and Us PPT Courseware

In the context of shortage of fresh water resources, water pollution poses a threat to humans and other organisms.

Most water pollution is caused by human activities. Which human activities cause water pollution?

How should wastewater be treated before it can be reused?

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?

Answer: It becomes clearer after purification than before purification.

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

Answer: 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.

Wastewater treatment

At present, most sewage is discharged directly into rivers and lakes, seriously affecting the quality of the water environment. Using polluted water can be harmful to our health, harmful to ecosystems, harmful to crops... Sewage should be treated before being discharged into natural waters.

What methods are used to purify the reprocessing pool?

The treatment of sewage is complex and generally requires three methods (physical methods, biological methods, and chemical methods) to achieve purification.

The physical method is mainly a device called a "grid" that separates debris and larger particles in the water. Debris includes plastic bags, vegetable leaves, weeds, etc.;

Biological methods use bacteria to break down dirt in water and are the core of sewage treatment.

Chemical methods are mainly used for disinfection. The usual approach is to add a chemical agent-chlorine to the water, which can effectively kill the pathogenic microorganisms in the water.

1. 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 ________.

5. Tap water is the main _______, and swimming is prohibited in ____________.

6. At present, sewage mainly includes ____________, _____________, __________, etc.

7. We can use _________, __________ and other methods to separate impurities in sewage.

2. Why should we pay special attention to the source of tap water? Where should we start to protect tap water sources?

Answer: Because whether the drinking water is clean directly affects people's health.

We should protect water sources from the following aspects:

1. Do not discard waste in water source protection areas such as reservoirs;

2. Do not swim or wash in water source protection areas;

3. Do not damage vegetation related to water source protection areas.

4. Do not dump waste residue, garbage, feces and other waste into waters;

5. No pesticides, explosives or poisons are used to kill fish;

6. If pollution is discovered, report it to the environmental protection department in a timely manner.

Keywords: Environment and us teaching courseware, sewage and sewage treatment teaching courseware, textbook version of the sixth grade science PPT courseware download, second volume science PPT courseware download, sixth grade science slide courseware download, environment and us PPT courseware download, sewage and sewage treatment PPT courseware download, .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 download:

"Sewage and Sewage Treatment" Environment and Us PPT Download Part One: Introduction of New Lessons In the context of shortage of freshwater resources, water pollution poses a threat to humans and other organisms. Most water pollution is caused by human activities. What human...

"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..

"Sewage and Sewage Treatment" Environment and Us PPT Courseware 3:

"Sewage and Sewage Treatment" Environment and Us PPT Courseware 3 In the absence of fresh water resources, water pollution poses a threat to humans and other organisms. The vast majority of water pollution is caused by human activities, such as domestic wastewater, industrial sewage, and oil pollution. ..

File Info

Update Time: 2024-10-18

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

Preview