How Scientists Are Finally Making Plastic Pay Its Way

By Siam Sukkhee Trading Co., Ltd — 2026-09-01 — Waste360 (recycling/scrap)

I watched a documentary once about a recycling facility. Mountains of plastic, workers trying to sort it by type, machines breaking down from contamination. The whole system limping along because nobody wanted to pay for the labour.

That's what made the UCLA research stick with me.

Here's the problem, more or less: plastic is everywhere—water bottles, shopping bags, dashboards. But once it's discarded, it becomes nearly impossible to recycle properly. Most facilities need plastics sorted by type first. Labour-intensive. Costly. As far as I can tell, only about 9 per cent of discarded plastic actually gets recycled. The rest ends up in landfills or gets incinerated, spewing carbon dioxide the whole way.

Actually, that's not quite right—incineration does more than just pollute. It releases stored carbon back into the atmosphere when we could be doing something smarter with it.

A team led by researchers at UCLA Samueli and Ewha Womans University in South Korea has now developed something they call alkaline thermal treatment, or ATT. The process takes a mixture of the three most common plastics—polyethylene, polypropylene, and PET—and converts them directly into high-purity hydrogen. No sorting. No separate streams.

The real cleverness is in what happens to the carbon. When sodium hydroxide reacts with the plastic under heat, it doesn't just liberate hydrogen. The carbon that gets released is captured by that sodium hydroxide and converted to solid sodium carbonate instead of escaping into the air. More than 75 per cent of the original plastic carbon ends up either as stable carbonate or liquid organic residues. It's still there. It's just not in the atmosphere.

This matters because previous low-temperature methods—things like solar-driven photoreforming—only work on oxygen-containing plastics like PET. They leave behind the most abundant waste plastics, polyethylene and polypropylene. High-temperature gasification can handle unsorted mixed plastics, but it releases substantial carbon dioxide. ATT does both at once, and at temperatures far below conventional gasification.

The hydrogen itself is high-purity. That's important for industrial use.

Is it perfect yet? Almost certainly not. Scaling up from the lab to an industrial facility always reveals problems nobody anticipated. Catalyst degradation, feedstock variability, the economics of operation. But what you're looking at here is the first time anyone has solved this particular combination of problems simultaneously—and that's the kind of work that shifts what people think is possible.

Source: "Alkaline thermal treatment (ATT) — a process in which sodium hydroxide reacts with organic material under heat to drive hydrogen production — can efficiently convert a mixture of the three most common plastics directly into high-purity hydrogen fuel." — UCLA Newsroom

Tags: ESG metals mining industry