The plastic packaging recycling process can be divided into three types: regeneration, pyrolysis and incineration. Regeneration is divided into simple regeneration and composite regeneration.
Plastic packaging recycling is preferred to use a simple recycling method. This method is also called mechanical regeneration. Because it is a low-entropy treatment method, it must be classified and recycled due to technical and economic factors. Simple regeneration refers to the direct pulverization of scrap, scrap or cleaned single-variety plastic packaging and mixing with the material to return to the plastic processing process. Due to the convenience of China's labor force, this labor-intensive process is currently adopted in China. 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.
Hydrolyzed by polyvinyl acetate can be made into a water-soluble polyvinyl alcohol resin (PVa) which is a plastic packaging that does not need to be recycled, does not produce solid waste, and is particularly suitable for packaging foods, pesticides, detergents, etc., and can be directly dissolved in water. For ecological plastic packaging wastes such as modified starch and polylactic acid that can be completely biodegraded, they can be returned to nature through composting.
Plastic waste can be depolymerized into monomers by chemical or pyrolysis, and can be hydrolyzed to recover monomeric plastic packaging, limited to polystyrene, polymethacrylate, polyester, nylon, etc. The above method is subject to economic rationality. Sex. The waste polyester can be directly cracked to form a hot melt adhesive. PS waste can produce architectural coatings and paints. After the waste plastic is pulverized, it is mixed with wood powder and granulated, and can be molded into a plastic product. A large amount of inorganic filler is added to waste plastics such as PE, PP, PVC, etc., and calcium plastic products can be produced. Waste PE can be used to manufacture PE modified asphalt to improve the technical performance of asphalt pavement.
Blended plastics are blended with municipal organic waste to make coated fertilizers. Mixed plastics can also be converted into oil or gas by pyrolysis, and then chemical products or fuels can be produced, but at a higher cost. Germany and Japan have used plastic waste testing as a blast furnace reducing agent instead of coke, which is economically feasible.
The conversion of plastic incineration into heat energy is an economically desirable way for developed countries with high labor costs, but the incinerator has a large investment and is suitable for large and medium-sized cities with large proportion of plastics in garbage. After incineration, the plastic can be reduced by 90% by volume and 80% by weight. The calorific value is generally 83kJ / kg, which is close to fuel oil. From the data on the treatment costs of German plastic waste in 1992 given in Table 5, it is economically feasible for them to burn. The disadvantage of incineration is the presence of atmospheric pollution.
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