Recycling, Treatment and Utilization of Plastic Bags

The annual waste from packaging bags in China is about 16 million tons, accounting for 25% of the volume of urban solid waste. If this continues, it will lead to severe environmental pollution and cause huge waste of resources. The economic losses caused by solid waste and the value of unused but recyclable waste resources in China reach up to 30 billion yuan every year.

Material recycling technology refers to the process of regenerating sorted packaging waste (sorted by the type of packaging materials) into new materials of the same type using corresponding treatment technologies. In terms of regeneration technologies, various types of packaging waste can generally be recycled for material reuse, but the economic efficiency of their recycled materials varies significantly. Among them, the recycling and regeneration of paper, glass, and metals are relatively economically reasonable, while plastics are less ideal.

Thermal energy recovery involves incinerating mixed combustible packaging waste in an incinerator and using the thermal energy generated during combustion as an energy source for power generation and heating. Before thermal energy recovery, there is generally no need for strict sorting of mixed packaging bag waste. The result of this recovery and treatment process significantly reduces the volume and weight of solid waste, making it a convenient method for packaging waste disposal. However, it is worth noting that the flue gas produced during the recovery process must be treated with reliable technical measures to prevent secondary air pollution.

### Current Status of Recycling and Disposal of Plastic Packaging Bag Waste #### Types and Uses of Plastic Packaging Materials China's plastic packaging bag materials account for approximately 26% of the total plastic output. Plastic packaging comes in a wide variety of types and molding forms, and possesses numerous excellent properties. For example, there are materials resistant to normal temperature, low temperature, high temperature, stretching, compression, and shock absorption, making them widely used in the packaging industry. They can be applied to packaging for food (solid and liquid), industrial products, sundries, chemical products, cultural supplies, and more. Currently, the more commonly used plastic packaging materials include: polyethylene, polypropylene, polystyrene, polyamide, ethylene-vinyl acetate copolymer, etc. The forms of plastic products include films, fibers, and rigid molded materials. Among them, films can be made into various plastic packaging bags; fibers can be woven into handbags or larger woven bags; rigid molded materials can be made into various plastic buckets, plastic bottles, plastic packaging boxes, turnover boxes, calcium plastic boxes, and so on.

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