Strategies to Reduce the Environmental Lifetimes of Drinking Straws in the Coastal Ocean

作者：Bryan D. James, Yanchen Sun, Mounir Izallalen, Sharmistha Mazumder, Steven T. Perri, B. R. Edwards, Jos de Wit, Christopher M. Reddy, Collin P. Ward · 发表于：ACS Sustainable Chemistry & Engineering · 年份：2024 · DOI：10.1021/acssuschemeng.3c07391 · 被引用次数：20 · 研究领域：Microplastics and Plastic Pollution、biodegradable polymer synthesis and properties、Recycling and Waste Management Techniques

High Resolution Image Download MS PowerPoint Slide Nonpersistence in natural environments with benign degradation products is a growing design criterion for consumer plastics. However, data on their biodegradation rates and environmental lifetimes in the coastal ocean are lacking, limiting informed engineering and regulatory decisions. Single-use drinking straws, a common marine litter relevant to key stakeholders, exemplify this. To fill this knowledge gap, commercial drinking straws made of cellulose diacetate (CDA), polyhydroxyalkanoates (PHA), paper, polylactic acid (PLA), and polypropylene (PP) were incubated for 16 weeks in a flow-through seawater mesocosm and monitored for degradation and microbial community composition. CDA, PHA, and paper straws reduced in mass by up to 50%, projecting environmental lifetimes of 10–20 months in the coastal ocean. PP and PLA showed no measurable mass loss. Lifetimes depended on the material and dimensions of the straw, demonstrating the need to balance function and degradation properties. The materials that biodegraded exhibited unique microbial communities driven by chemical structure, whereas those materials that were persistent exhibited similar communities despite substantial differences in chemical structure. To reduce the persistence of drinking straws, we hypothesized that changing the product form (i.e., surface area), not just the material, can reduce their environmental lifetimes. To test our hypothesis, we evaluated the bio...