"Sewage and Sewage Treatment" Environment and Us PPT

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"Sewage and Sewage Treatment" Environment and Us PPT

Part I: 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?

How can we separate impurities from sewage?

Let it sit naturally and sediment the mud and sand.

Add a small amount of alum and let it settle.

Pour the clearer water in the upper part of the sedimentation cup into another cup.

Impurities in the water are further removed through filtration.

Sewage and sewage treatment PPT, part 2: discussion of pollution sources

Various pollutions in the environment, such as industrial pollution, agricultural pollution, animal husbandry pollution, domestic pollution, etc., will affect the quality of water sources.

industrial pollution

Untreated industrial wastewater

Mine wastewater

Pile solid industrial waste near water

agricultural pollution

Farmland wastewater caused by excessive use of chemical fertilizers, pesticides, and herbicides

Livestock wastewater discharged from breeding farms

soil erosion

life pollution

Dump household garbage near the water

Untreated domestic sewage

Discharge food and beverage swill directly or indirectly into water bodies

Car oil leaks and car washes by the river

Other pollution

Oil spills or accidents (or emergencies) from tankers cause oil to pollute the ocean. Because the oil film covers the water surface, a large number of aquatic organisms die, and the decomposition of dead bodies can cause water pollution.

Pollutants are dissolved in water and transported to distant locations through water movement.

In most areas, tap water comes from reservoirs, lakes or rivers. Tap water is the main source of drinking water. Pollution of drinking water sources will directly affect our health.

Sewage and sewage treatment PPT, Part 3: Treatment of sewage

At present, most sewage is discharged directly into rivers, lakes and seas, seriously affecting the quality of the water environment. Using contaminated water can be harmful to our health, harmful to ecosystems, harmful to crops…

Sewage should be treated before being discharged into natural waters.

Wastewater treatment system diagram

①Preliminary processing

As the wastewater flows through the treatment equipment, the flow rate slows down and the larger solids settle down. When the water passes through the sedimentation tank, the smaller particles sink to the bottom to form sludge.

②Reprocessing

In a trickle filtration system, wastewater is filtered through gravel, and the surface of the gravel can also be covered with a layer of bacteria to break down waste in the sewage.

③Additional processing

The water is discharged into an open-air pond, where it is naturally purified by sunlight and air, and pure water vapor is formed when it enters the atmosphere. Chlorine is generally added before the treated water is discharged again.

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

Treated water that is not suitable for drinking can still be used in other ways, such as watering lawns and trees, or as cooling water in factories.

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"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...

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Update Time: 2024-11-15

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