Is Advanced Recycling the Same as Incineration?
One of the most common questions surrounding advanced recycling is whether it is the same thing as incineration. The short but unambiguous answer is no. They are completely different processes, designed for different purposes, and they produce different outputs.
What is Municipal Solid Waste (MSW) Incineration?
MSW incineration is the process of burning mixed household and commercial garbage (paper, organics, plastics, etc.) at high temperatures for the purpose of recovery. Commonly known as waste-to-energy (WtE), incineration reduces the volume of garbage by about 90% while generating electricity and/or thermal energy. In this process, MSW is delivered to a bunker where a crane loads it into a combustion chamber. The MSW is burned in the chamber, typically on a moving grate that ensures complete combustion. Because combustion takes place in the presence of excess oxygen or air, it completely converts the organic content of the waste into CO2 and H2O gases, leaving the inorganics in the waste as a solid residue known as ash. The hot gases then pass through a boiler, making high pressure steam that is used to generate electricity. The gas exiting the boiler is then scrubbed and filtered to remove pollutants before being released to the atmosphere.
Conversely, advanced recycling technologies are designed to address only plastics, with the intent to recover material value. Carefully prepared mixed plastics are fed into closed systems which operate in the absence of oxygen, using heat, microwave or pressure to break those polymers back into their molecular building blocks for use in the production of a range of commercial products. Unlike combustion-based systems, advanced recycling processes are designed to recover usable material outputs rather than destroy the material primarily for energy generation.
How does Pyrolysis Work?
Pyrolysis is one of the most publicly discussed advanced recycling technologies. In pyrolysis, plastics are heated in a closed environment with little or no oxygen present. Instead of burning the material, the process breaks plastics down into liquids, waxes, gases, or chemical feedstocks that can be used as raw materials in manufacturing and industrial applications.
By comparison, incineration relies on combustion, which involves oxygen and is designed primarily for waste destruction and energy generation.
Different Processes, Different Outputs
One of the biggest differences between advanced recycling and incineration is the intended output. Incineration is generally focused on destruction to reduce waste volume and recover energy. The heat generated from the combustion of the waste is captured to generate electricity.
Conversely, advanced recycling technologies are designed to generate new commercial materials such as chemicals, plastic monomers, waxes, lubricants, and/or fuels that may be used to offset virgin feedstock which would otherwise be used to make those products.
Depending on the process, some advanced recycling outputs may produce fuels that would offset virgin fossil-derived fuels or other carbon feedstocks. In these cases, the objective function shifts from material production to energy production, making the intended outcome more analogous to energy recovery than material circularity.
These pathways are often discussed separately because they reflect different goals for carbon utilization, whether to recover energy, produce new materials, displace virgin resources, or some combination thereof, and therefore may be evaluated differently within waste management, recycling, and circular economy frameworks.
Advanced Recycling Includes Multiple Technologies
While pyrolysis is often the focus of public discussion, advanced recycling includes a broader range of technologies, including:
depolymerization
dissolution
gasification
solvolysis
and other emerging processes
Each technology works differently and may produce different outputs depending on the materials being processed and the design of the system. (For more information on the different technologies, check out the advanced recycling technologies overview blog here.)
Why These Distinctions Matter
As policymakers, researchers, and communities evaluate recycling and waste management systems, terminology and definitions have become an important part of the conversation. Understanding the differences between technologies, processes, and outputs can influence how technologies are regulated, permitted, financed, and credited within sustainability frameworks, affecting investment decisions, market development, and public perception. A clearer understanding of these distinctions can help support more informed discussions about recycling, circularity, material recovery, carbon management, and waste management systems.