5 Common Ways to Dispose of Waste Plastics

The main 5 methods of disposal of waste plastics include the following:

1. Chemical material recycling method:

1. Principle: By heat cracking, catalytic cracking or bio-enzymatic decomposition of waste plastics by isolating them from the air, the plastics can be decomposed into small molecules or low polymers, which can be used as new chemical raw materials.
2. Example: The mixture of PE, PP and PS can be thermally cracked in a fixed bed, and after separation, alkane gases and aromatic hydrocarbons, as well as a small amount of distillation residue and coke are mainly obtained. Waste plastics can also be catalytically cracked directly into fuel oil and can be reused by breaking them down into small molecule compounds via plastic biodegradation enzymes.
3. Prospects: This method is still under industrialized research and is not widely used, but it is considered to be one of the most promising recycling and treatment methods in the future.

2. Physical landfill method:

1. Principle: waste plastics are directly landfilled in natural landfills below the surface.
2. Disadvantages: Plastic products are made large and light and are not perishable, which can cause the landfill to become a soft foundation that is difficult to utilize in the future. At the same time, the additives in the plastics can cause secondary pollution of the land, significantly reducing the landfill's ability to handle waste.

3. Composite modified utilization method:

1. Principle: The waste plastics are used for road paving, or used as construction materials, etc. after compound modification by physical methods and asphalt or construction materials.
2. Application: This method provides new application areas for waste plastics and helps to reduce the amount of plastic waste.

4. Combustion Energy Recovery Method:

1. Principle: Waste plastics are burned to convert their heat into electricity or use the heat energy for metal smelting.
2. Environmental Measures: This method can also be a very environmentally friendly recycling method if the combustion exhaust is treated harmlessly.
3. Limitations: Recycling of plastics is of great significance from the point of view of saving the earth's resources, so the combustion energy recycling method is not an optimal choice.

5. Mechanical and physical recycling method:

1. Principle: Recycling of waste plastics after crushing, cleaning, screening and classification, re-pelletizing and other processes to be re-processed and utilized.
2. Application: The processed waste plastics can be directly used as raw materials or used in combination with new materials.
3. Advantages: Mechanical and physical recycling method is the main harmless industrial treatment method at present, and it is also one of the most friendly recycling methods to the environment.

There are various treatment methods for waste plastics, and each method has its own characteristics and scope of application. In practical application, suitable treatment methods should be selected according to specific conditions in order to realize the dual goals of resource utilization of waste plastics and environmental protection.

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