Smoke and Mirrors: Why the ‘Miracle’ Pyrolysis Technology Falls Short

The UN Environment Programme (UNEP) reported that global plastic production has reached 400 million metric tonnes. Year on year, the demand for plastic has increased exponentially, driven by its availability, cost effectiveness and durability in relation

to natural products such as wood. 

The term 'durability' is almost contradictory when describing plastic. Plastics can take thousands of years to break down in landfill, yet over time they also slowly degrade into microplastics. In both forms, the environmental impact is significant. The vast amounts of plastic waste in landfill have leached into waterways, rivers, and seas, with devastating consequences for the natural world.

Stricter regulations on plastic reduction and disposal have sparked a race to find viable solutions. One such approach is pyrolysis, a term derived from the Greek words pyro, meaning heat, and lysis, meaning separation. Pyrolysis uses high temperatures in the absence of oxygen to break down materials without combustion, producing energy in the form of oil, char, or gas.

Plastics are made from crude oil or natural gas. Pyrolysis is promoted as a way to convert plastic waste into a hydrocarbon-rich synthetic oil, which can then be refined into vehicle fuel. The idea of turning a once thought non-biodegradable waste into something as useful as fuel has been seen as revolutionary and hailed as a potential way to reduce dependence on fossil fuels. The process also effectively eliminates biological contamination of the resulting product, as often seen with hazardous hospital and laboratory waste. 

Pyrolysis offers high efficiency, low consumption and high oil yields, making plastic-to-fuel ventures potentially profitable for companies and governments while creating jobs and reducing fossil fuel dependence. However, the process has limitations: plants are energy- and cost-intensive, raising questions about overall sustainability. Inconsistent quality can result from processing varying types and volumes of plastic, and as a relatively new sector, regulation of final products is currently limited. The lack of harmonised standards and rigorous regulation means the full environmental costs of pyrolysis are still unknown, and the high temperatures required can release harmful gases, such as carbon monoxide, into the atmosphere.

Environmentalists argue that the only true solution to plastic's catastrophic impact is to ban it entirely. From this perspective, efforts to recycle plastic distract from the urgent reality that plastic is toxic to the environment, ecosystems and human health, making the elimination of plastic production the only real solution.

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Images:

Bottles, Green - Image by Dean Moriarty from Pixabay (ST ref:1351)

Pyrolysis flowchart - Image by Amanda Dandagama (ST ref:1358)

Edited by Amanda Dandagama