"Classification and Recycling" Environment and Us PPT Courseware 4

"Classification and Recycling" Environment and Us PPT Courseware 4

The natural environment is a necessary condition for human survival. However, while human beings are developing themselves at a high speed, they are also destroying their own living environment. Today we are facing serious threats from environmental pollution and ecological imbalance, including global warming, damage to the ozone layer, water pollution, and sharp decline in forests...

These are problems facing mankind that need to be solved urgently. We started searching on the topic of garbage classification and recycling to let people know and understand the utilization of recyclable garbage resources, enhance people's awareness of protecting the environment, save resources, and maintain ecological balance.

For some wastes in life, we can recycle them from garbage and reprocess them. Doing so will not only reduce the amount of garbage, but also save a lot of natural resources.

What kind of waste can be recycled?

Recyclable garbage refers to waste that is suitable for recycling and utilization as resources.

How to recycle them?

1. Recyclable garbage

Research nearby recycling depots or ask recycling workers what they recycle?

What are these items used for after recycling?

Garbage classification

Human beings produce a large amount of garbage every day. If a large amount of garbage is not classified, recycled, reused and discarded arbitrarily, it will cause environmental pollution.

Garbage classification is the classification of garbage into recyclable and non-recyclable categories.

Types of garbage that can be recycled (1)

mainly include:

1. Paper: writing paper, packaging paper and other paper products that are not seriously stained. Such as newspapers, various wrapping papers, office paper, advertising paper, cartons, etc.;

2. Plastic: waste container plastic, packaging plastic and other plastic products. For example, various plastic bags, plastic bottles, foam plastics, disposable plastic lunch boxes and tableware, hard plastics, etc.;

Types of garbage that can be recycled (2)

3. Metal: Various categories of scrap metal items. Such as cans, tin cans, lead toothpaste skins, waste batteries, etc.;

4. Glass: colored and colorless waste glass products;

5. Fabric: old textile clothing and textile products.

Non-recyclables refer to garbage other than recyclable garbage. Common garbage is easily decomposed under natural conditions, such as fruit peels, vegetable leaves, leftovers, flowers, branches and leaves, etc.

Advantages of garbage classification

Classifying garbage collection can reduce the amount of garbage disposal and processing equipment, reduce processing costs, reduce the consumption of land resources, and has social, economic and ecological benefits. The advantages of waste classification are as follows:

①. Reduce land occupation: Some substances in domestic waste are not easily degraded, causing serious erosion of the land. Garbage classification, removing recyclable and non-degradable materials, reducing the amount of garbage by more than 60%.

②. Reduce environmental pollution: Abandoned batteries contain toxic substances such as metallic mercury, lead, and cadmium, which can cause serious harm to humans; waste plastics in the soil can lead to reduced crop yields; discarded waste plastics are accidentally eaten by animals, causing Fatal accidents happen from time to time. Recycling therefore reduces harm.

③. Turn waste into treasure: China uses 4 billion plastic fast food boxes, 500-700 million instant noodle bowls, and billions of disposable chopsticks every year, accounting for 8-15% of domestic waste. One ton of waste plastic can be recycled into 600 kilograms of diesel. Recycling 1,500 tons of waste paper can avoid cutting down the trees used to produce 1,200 tons of paper. One ton of cans can be melted to form one ton of good aluminum blocks, which can save 20 tons of aluminum ore. 30% of production waste - 40% can be recycled, so you should cherish this small but profitable resource. You can also use cans to make pencil boxes, which is environmentally friendly and saves resources.

Benefits of packaging

The ultimate goal of garbage classification is a resource recycling society. Garbage mixing treats garbage as waste, while garbage sorting treats garbage as resources; mixed garbage is sent to landfills, occupying a large amount of land, and separated garbage is distributed to various recycling departments. Occupying land; mixed garbage will pollute the land and atmosphere whether it is landfilled or incinerated, while separated garbage will promote harmless treatment; mixed garbage increases the work of sanitation and environmental protection departments, and separated garbage only requires a little effort from us. Moreover, garbage classification and packaging facilitate the treatment of toxic waste.

1. Recycling waste plastics – developing the “second oil field”

Many waste plastics can be reduced to recycled plastics, and all waste plastics, waste lunch boxes, food bags, woven bags, flexible packaging boxes, etc. can be recycled into fuel. One ton of waste plastic can recycle at least 600 kilograms of gasoline and diesel. No wonder some people call recycling old plastic the development of a "second oil field."

2. Recycle used batteries – to prevent tragedy from happening again

"Itai-itai disease" and "Minamata disease" are both industrial pollution diseases that occurred in Japan. This is due to industrial wastewater containing cadmium or mercury contaminating soil and water sources and entering the human food chain. "Minamata disease" is mercury poisoning. Due to the accumulation of large amounts of methylmercury in the body, patients suffer damage to the central and peripheral nerves of the brain. In mild cases, the hands and feet are numb, and in severe cases, death. "Itai-itai disease" is caused by cadmium poisoning. Patients suffer from pain in their hands and feet and are prone to fractures throughout their bodies. People who suffer from this disease keep shouting "It hurts! It hurts!" until they die, so it is called "Itiny disease". Since ordinary soil dry batteries contain these two toxic metal elements, pollution is always lurking in the battery from production to disposal. Battery recycling is imperative!

3. Recycle waste paper – regenerate forest resources

Recycling 1 ton of waste paper can produce 800 kilograms of good paper, cut down 17 large trees, save 3 cubic meters of landfill space, save more than half of papermaking energy, and reduce water pollution by 35%. Each piece of paper Can be recycled at least twice. After the first recycling, office paper, old letter paper, notebooks, books, newspapers, advertising paper, loan wrapping paper, cartons, paper tableware, etc. can be recycled into books, manuscript paper, business cards, etc. Notes etc. After the second recycling, it can also be made into toilet paper.

recyclable trash

It mainly includes five categories: waste paper, plastic, glass, metal and cloth.

Waste paper: mainly includes newspapers, periodicals, books, various packaging papers, office paper, advertising paper, cartons, etc. However, it should be noted that paper towels and toilet paper cannot be recycled because they are too water-soluble.

Plastics: Mainly include various plastic bags, plastic packaging, disposable plastic lunch boxes and tableware, toothbrushes, cups, mineral water bottles, toothpaste wrappers, etc.

Glass: mainly includes various glass bottles, broken glass pieces, mirrors, light bulbs, thermos bottles, etc.

Metal objects: mainly include cans, cans, household appliances, cars, etc.

Fabrics: mainly include discarded clothes, tablecloths, face towels, school bags, shoes, etc.

Through comprehensive processing and recycling, pollution can be reduced and resources saved. For example, every ton of waste paper recycled can make 850 kilograms of good paper, save 300 kilograms of wood, and reduce pollution by 74% compared with the same amount of production; every ton of plastic beverage bottles recycled can obtain 0.7 tons of secondary raw materials; every ton of scrap steel can be recycled Smelting 0.9 tons of steel, saving 47% of the cost compared with ore smelting, reducing air pollution by 75%, and reducing water pollution and solid waste by 97%.

Sorting and recycling

Key points of this lesson

1. Some raw materials in garbage can be recycled, which can reduce garbage and save resources.

2. Garbage classification and packaging facilitate garbage recycling and processing of some toxic waste.

3. Composting method can effectively reduce waste and form fertilizer.

Think about it, are the following statements correct?

1. When we have no way to reduce the usage of some materials, we can reduce the amount of garbage by recycling the raw materials in the garbage and reprocessing them ( ).

2. Most of the recyclable items are made of glass, metal, paper, plastic, etc. ( ).

3. Waste batteries are a kind of garbage that need to be disposed of carefully ( ).

4. To effectively recycle raw materials in garbage, the habit of mixing garbage must be changed ( ).

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