STEM与日常科技·英语30篇（9）
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What Happens Inside a Compostable Coffee Cup?
可堆肥咖啡杯内部发生了什么
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Compostable cups look like plastic but are made from plant starches like corn or sugarcane fiber.可堆肥杯子外观像塑料，但由玉米或甘蔗纤维等植物淀粉制成。
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Special enzymes in industrial compost facilities break glycosidic bonds in the starch chains.工业堆肥设施中的特殊酶会分解淀粉链中的糖苷键。
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Heat, moisture, and microbes work together to turn the cup into carbon dioxide, water, and humus.热量、水分和微生物共同作用，将杯子转化为二氧化碳、水和腐殖质。
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Home compost bins rarely reach the 60°C+ needed for full breakdown within weeks.家庭堆肥箱通常无法在几周内达到完全降解所需的60°C以上温度。
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Certification labels like ‘ASTM D6400’ mean the cup meets strict disintegration and toxicity tests.‘ASTM D6400’等认证标识意味着该杯子通过了严格的崩解性和毒性测试。
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Dyes and lids must also be certified compostable—or they contaminate the entire batch.染料和杯盖也必须通过可堆肥认证，否则会污染整批堆肥。
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Landfill conditions lack oxygen, so these cups degrade slowly and release methane instead.填埋场缺氧，导致这类杯子降解缓慢并释放甲烷。
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Retailers using such cups often partner with local compost services to close the loop responsibly.使用此类杯子的零售商常与本地堆肥服务机构合作，以负责任地实现闭环循环。