Waste-to-Energy: Chemical Recycling–Based Plastic Recycling System

Plastic itself is not a pollutant. The essence of plastic pollution is visual pollution, soil damage, microplastics, and other hazards caused by poor management of waste plastics and their leakage into the natural environment, where they are difficult to degrade. Therefore, the core of establishing a plastic recycling system is to shift plastic waste from "linear disposal" to "closed-loop regeneration," forming full-chain governance covering production, circulation, consumption, recycling, and disposal.

I. Improving the Overall Framework of the Plastic Recycling System

From top-level design at the policy level and supporting institutional safeguards to the establishment of recycling networks and the coordinated improvement of recycled application systems, the establishment of a plastic recycling system requires top-down design and bottom-up execution.

For example, the Extended Producer Responsibility (EPR) systems implemented in many European countries require companies that place packaging or other plastics on the market to pay fees for the collection, sorting, and recycling of these materials, and are considered one of the proven circular economy pathways. More than 60 countries worldwide have implemented producer-pays recycling systems for plastics and tires. EPR sends economic signals to companies, incentivizing them to redesign packaging, improve recyclability, and incorporate recycled materials, thereby driving demand for recycled plastics. PPWR's mandatory requirements for recycled material demand also provide a clear signal for the recycling system. The establishment of a recycling system requires a comprehensive process, starting from the production and use of plastic products and extending through the entire life cycle until plastics become waste, to ensure the sustainability of this system.

A sound plastic recycling system is not a single recycling link; it should be a closed-loop system of "front-end sorted collection—mid-end sorting and pretreatment—end-stage sorted disposal," and a bottom-up integrated and complete recycling system.

For waste plastics, single, clean, high-value waste plastics follow the physical recycling route and can be directly remade into recycled plastics; however, for mixed, low-value, contaminated waste plastics, physical recycling is difficult to economically accommodate, and the chemical recycling route is needed, returning to chemical raw materials through processes such as liquefaction and monomerization, and then being reproduced into virgin-quality plastics. Chemical recycling is the core processing link in the recycling system specifically designed to handle the portion of waste plastics that "physical recycling cannot handle," and it determines whether the entire system can truly achieve "all-category, no-blind-spot" plastic resource utilization.

Chemical recycling depolymerizes waste plastics and then polymerizes them again, enabling them to be made into virgin-quality plastic raw materials, theoretically allowing infinite recycling and greatly improving resource utilization efficiency. Its technical routes include pyrolysis/catalytic cracking, depolymerization, gasification, etc., and can achieve closed-loop or industrial recycling for various materials such as PC, PP, PE, and PET, and can handle mixed or contaminated waste materials. In addition, chemical recycling can reduce carbon emissions in the waste plastic treatment process and the carbon footprint of new plastic production.

II. Building a Sound Plastic Recycling System with Chemical Recycling at Its Core

By depolymerizing waste plastics into basic chemical raw materials such as monomers, oils, or syngas, chemical recycling can produce new materials comparable in quality to virgin plastics, theoretically enabling same-grade recycling and food-grade applications, providing a key pathway for realizing a closed-loop plastics economy. Taking Niutech, a globally renowned core equipment supplier for chemical recycling of waste plastics, as an example, its waste plastic pyrolysis equipment can process low-value plastic waste, marine plastic waste, medical plastic waste, and waste textiles (including PP/PE/PS/ABS/nylon, etc.). The materials can be efficiently pyrolyzed without complex sorting, cleaning, drying, and fine crushing to produce high-value products—"plastics to oil"—realizing "waste-to-energy."

Niutech's technologies and equipment have passed EU CE certification, German TÜV certification, and ATEX certification, and its projects have passed ISCC certification. It has successfully turned waste plastics into valuable resources and serves as a bridge between upstream and downstream in improving the recycling system: upstream, it takes in mixed low-value waste plastics that are difficult to physically recycle after sorting; downstream, it sends pyrolysis oil to chemical plants to remake virgin-quality plastics, thereby truly connecting "waste plastic collection" with "downstream manufacturing demand." It has been successfully applied in waste plastic pyrolysis projects in multiple countries across Europe, the Americas, and Asia.