"Waste Disposal" Environment and Us PPT Download

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"Waste Disposal" Environment and Us PPT Download

Part 1: Importing new lessons

In addition to the inevitable household waste produced in daily life, factories, schools, hospitals, construction sites, etc. also produce large amounts of waste every day.

Garbage disposal PPT, part 2: exploring new knowledge

Thinking: What problems will this garbage cause if it is piled in the open?

1. Emit foul odor and pollute the air

2. Breed mosquitoes and flies, causing diseases

3. Contamination of soil and groundwater

So how are these wastes disposed of?

Method 1: Landfill method. A simple landfill is to find an open space, dig a big pit, dump the garbage into it, and then cover it with soil.

Is this method safe and effective? Let's study it experimentally.

Landfill waste simulation experiment

Experimental materials: washed fine stones, water, paper towels soaked in ink, wide-mouth bottles, tweezers

experiment procedure:

1. Put the washed fine stones about 3 cm thick into the jar.

2. Add water so that the water is just halfway up the stones.

3. Use tweezers to put a few balls of paper towels soaked in ink into the bottle near the bottle wall, and bury them with fine stones.

4. Slowly spray water on it.

5. Observe the changes in color and clarity of the water at the bottom of the bottle.

Properly designed landfills

How to solve the problem of landfills harming the surrounding environment? What methods can we think of? Use the above device to verify it experimentally.

The garbage dump uses an impermeable liner to isolate the "garbage house" from the surrounding soil, and establishes a garbage filtrate collection tank and a treatment tank.

After the landfill is filled with garbage, why can't it be used to build houses and grow crops?

1. There are various bacteria, microorganisms and other uncertain factors in landfills that affect human health.

2. After the landfill is covered with soil, the garbage ferments, decomposes, etc. and mutates, which may cause the ground to sink. So you can't build a house on it

3. There are a lot of heavy metals in garbage. Crops will absorb substances harmful to humans in the soil, and heavy metals are one of them.

Garbage disposal PPT, part three: expansion and extension

White gabbage

White pollution is an image term for the environmental pollution caused by refractory plastic waste (mostly plastic bags).

It refers to various household plastic products made of polystyrene, polypropylene, polyvinyl chloride and other polymer compounds that are discarded as solid waste after use. Because they are thrown randomly and are difficult to degrade, they cause serious problems to the urban environment. pollution phenomenon.

The main harms of garbage to human life and the environment are:

First, it occupies too much space.

Second, pollute the air.

Third, pollute water bodies.

Fourth, soil dregsification.

Fifth, fire hazard.

Sixth, the nest of harmful organisms.

Garbage disposal PPT, Part 4: Summary of this lesson

1. Simulated landfill waste experiment

2. New type of landfill. After the landfill is filled with garbage, parks and stadiums can be built on it, but it cannot be used to build houses or grow crops.

3. Advantages and disadvantages of burning garbage:

Advantages: It occupies a small area, avoids garbage contamination of groundwater, and the heat generated can also be used to generate electricity.

Disadvantages: Not only will it consume a lot of electricity and leave residues, but if it is not properly controlled, it will also produce toxic substances and cause secondary pollution.

Garbage disposal PPT, part 5: exercises for this lesson

1. Judgment questions

1. For a long time, people have used the method of digging holes in the ground and filling them in to dispose of garbage. ( )

2. Landfilling garbage is the safest and most effective method. ( )

3. After the landfill is filled with garbage, parks and stadiums can be built on it. ( )

4. After the garbage is landfilled, houses can be built on it. ( )

5. Burning garbage will cause pollution. ( )

2. Fill in the blanks

1.Before waste is incinerated or landfilled, we must _______ and _______.

2._______ is another way of disposing of garbage, which is to burn it in an incinerator.

3. The purpose of lining a landfill is to prevent _______ from seeping into the soil.

4._______ is an organic fertilizer that is rich in nutrients and has a long and stable fertilizer effect. It is also helpful in promoting the formation of soil solid structure.

Garbage disposal PPT, Part 6: 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 version, garbage disposal PPT download, environment and us PPT download, .PPT format;

For more information about the PPT courseware "The Environment and Our Garbage Disposal", please click the Environment and Our Garbage Disposal ppt tab.

"Waste Disposal" Environment and Us PPT:

"Waste Disposal" Environment and Us PPT Part One: Landfill Waste Simulation Experiment For a long time, people have used the method of digging pits and landfilling in the ground to dispose of waste. Let's experimentally investigate whether this method is safe and effective. In a jar...

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Update Time: 2024-10-20

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

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