ZERO WASTE NOTES · PART 07 The Truth About Recycling: Sorting It Right Doesn't Mean It Gets Recycled

사진: Unsplash의 Pawel Czerwinski

Sort your recycling carefully, and it's easy to assume the job is basically done. But how much of it actually gets recycled is a different question — and one most people never really look into. Rinse the bottle, peel off the label, keep the plastics separate — and still, the share that becomes a new product is smaller than it sounds.

1. Why the Recycling Rate Is Lower Than It Looks

Korea's Ministry of Environment reports a plastic recycling rate of 73%. But that figure includes “thermal recycling” — burning waste to recover energy, not turning it back into material.

Calculate it the way the EU does, counting only material that's actually recycled back into new material, and Korea's plastic recycling rate reportedly drops to around 27%. Looking at household waste alone, some estimates put the material recycling rate closer to 16%.

That gap — a 73% headline number against a 16% reality — is where most of the confusion about recycling comes from.

2. Things That Don't Actually Get Recycled

Some items get filtered out at the sorting facility even after going into the recycling bin. Receipts are printed on thermal paper with a chemical coating, so they're sorted as general waste, not paper. Small plastic items like straws and disposable forks are often too small for sorting machines to recognize, so they skip the recycling stream entirely.

Thin film plastics, like food wrap, tend to jam sorting equipment and are difficult for recycling facilities to process. Composite packaging — plastic, metal, and paper fused together — can't be separated, so it's not recyclable either. Even iced coffee cups are only partly recyclable: the cup body is plastic, but the lid and straw are a different material and need to be sorted separately.

3. How to Sort Correctly

The basics of improving your recycling rate come down to three things: empty and rinse containers, remove labels and contaminants, and sort accurately by material. A 2020 survey by the Korea Consumer Agency found that over 60% of respondents had at least one recycling rule wrong.

A few commonly confused items are worth knowing in detail:

·         Paper cartons (like milk cartons) — These go through a completely different recycling process than regular paper. Paper becomes new paper directly, but cartons need their coating stripped off first to become things like tissue paper. Mixed in with regular paper, they become contamination — which is part of why the actual recycling rate for paper cartons is reportedly only around 15%. They need to go in a dedicated carton collection bin.

·         Black plastic containers — Sorting facilities use near-infrared sensors to identify materials, and black absorbs light instead of reflecting it, so the sensor can't read it. Even sorted correctly at home, these often end up incinerated or landfilled anyway.

·         Styrofoam with oil or blood residue (meat and fish trays) — Leftover residue gets treated as contamination during processing. If washing doesn't fully remove the smell or grease, it's safer to treat it as general waste.

·         Broken glass cups, ceramics, heat-resistant glass — These have a different melting point and composition than standard glass bottles, and melting them together causes quality problems. They need to be handled separately.

·         Paper cups with an interior coating (takeout cups) — These look like paper on the outside, but a polyethylene film lining the inside means they can't be separated through standard paper recycling.

For anything confusing, your local government's website or a sorting app is the most reliable source.

4. What Matters More Than Recycling

Recycling is the last step for something that's already been made. In the 5 Rs, Recycle comes last for a reason. However carefully you sort, it's still not as effective as not buying the thing in the first place, or using it again.

Sorting well matters. But waste actually goes down when refusing and reusing — the steps before recycling — get equal attention.

A reasonable place to start: check today's trash and see how much of it would actually count as general waste rather than recyclable material.

Was there anything you assumed was recyclable that turned out not to be?