Plastic packaging waste recycling value

Plastic packaging recycling process can be divided into renewable, pyrolysis and incineration. Regeneration is divided into simple regeneration and composite regeneration.

Simple regeneration means that the scrap, waste, or cleaned single-type plastic packaging is directly crushed and mixed with the raw material, and returned to the plastic processing process. Plastic packaging recycling priority to use this recycling method, this method is also called mechanical regeneration, because it is a low-entropy treatment, subject to technical and economic factors, must be classified recovery. Due to the convenience of our country’s labor force, this kind of labor-intensive process is currently used in many ways in our country. EPS waste can be added to lightweight concrete to make lightweight and insulating materials. PU waste can be used as artificial soil to improve soil water storage.

Plastic waste can be depolymerized into monomers using chemical or pyrolysis, etc. Plastic packaging that hydrolyzes and recovers monomers is limited to polystyrene, polymethacrylate, polyester, and nylon. These methods are subject to economic rationality. Sex. Waste polyester can be directly cracked into hot melt adhesives. PS waste can produce architectural coatings and paints. After the waste plastic is crushed, it is mixed with wood flour and granulated, which can be molded into plastic products. PE, PP, PVC and other waste plastics add a lot of inorganic fillers, can produce calcium plastic products. Waste PE can be used to make PE modified asphalt and improve the technical performance of asphalt pavement.

Mixed plastics and urban organic waste can be blended to produce coated fertilizers. Mixed plastics can also be converted into oil or gas by pyrolysis, and then they can be used for chemical products or fuels, but at a higher cost. Germany and Japan have used plastic waste tests as a reductant for blast furnaces instead of coke, which is economically viable.

The incineration of plastics into heat energy is an economically desirable method for developed countries with high labor costs, but the incinerator investment is relatively large, and it is suitable for large and medium-sized cities where the proportion of plastics in waste is relatively large. After plastic incineration, it can reduce the volume by 90% and the weight by 80%. The calorific value is generally 83kJ/kg, close to the fuel oil. From the data on the disposal costs of plastic waste in Germany in 1992, given in Table 5, for them, incineration is economically viable. The disadvantage of incineration is the presence of atmospheric pollution.

The use of polyvinyl acetate hydrolysis can be made of water-soluble polyvinyl alcohol resin (PVA), is a plastic packaging without recycling, does not produce solid waste, especially suitable for packaging food, pesticides, detergents, etc., can be directly dissolved in water . Eco-plastic packaging wastes such as modified starches and polylactic acid that can be completely biodegraded can be returned to nature through composting.







Source: Shenzhen Waste Recycling Network