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食品廃棄物由来の堆肥に潜むマイクロプラスチック

Hidden Microplastics in Food-Waste Compost

食品廃棄物から作られる堆肥は土を豊かにしますが、小さなプラスチック片が混ざり込む問題が近年の研究で明らかになっています。
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Compost made from food waste can improve soil and reduce the amount of rubbish sent to landfills. However, it may contain an unwanted ingredient: microplastics. These are plastic pieces smaller than five millimeters. They can enter food waste through plastic packaging, bags, labels, and other items that people throw away by mistake.

A 2025 study examined 20 kinds of compost from Vermont in the United States. Researchers found between zero and 1,201 plastic particles in each dry kilogram of compost. The five samples with the highest plastic weight were all made partly from food waste. However, the researchers could not prove that food-waste compost always contained more plastic because the results differed greatly among samples. (frontiersin.org)

Another study tested commercial compost made from several kinds of waste. Microplastics appeared in 80 percent of the samples. Compost made from mixed city waste had much more plastic than compost made from canteen waste. This suggests that careful waste separation can make a big difference. Common plastics included materials often used in food containers, bottles, and bags. (pubmed.ncbi.nlm.nih.gov)

Even products marked “compostable” may cause problems. In a 2024 experiment, researchers placed certified compostable bags in outdoor home compost. After several months, they found both small and large plastic pieces in every compost pile. Home compost may not become hot enough, or stay hot long enough, to break down some products completely. (pubmed.ncbi.nlm.nih.gov)

Scientists are still studying how microplastics affect soil, plants, animals, and people. Therefore, it is important not to overstate the danger. Still, we can reduce the problem now. Before composting food waste, remove produce stickers, plastic wrapping, and tea bags that contain plastic. Do not add a compostable bag unless your local composting service accepts it. Compost is valuable, but keeping plastic out from the beginning is easier than removing thousands of tiny pieces later.

by EigoBoxAI
作成:2026/08/01 18:00
レベル:中級 (語彙目安:2000〜2500語)
タイプ:リーディング

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