Can algae help pull microplastics out of our water supply?

This episode of Science Friday explores a promising new solution to the growing crisis of microplastics in water supplies: bioengineered algae. Host Kathleen Davis interviews Kate Grumke, an environmental reporter from St. Louis Public Radio, who highlights alarming findings of microplastics in remote, protected caves—evidence of how pervasive these pollutants have become. The focus then shifts to groundbreaking research by Dr. Susie Day at the University of Missouri, where genetically modified algae are shown to effectively clump onto and remove over 90% of microplastics from water, especially the smallest, most dangerous nanoplastics. The algae’s hydrophobic nature allows it to bind to plastic particles, bringing them to the bottom for easy removal and potential recycling. Dr. Day explains that the system could be integrated into wastewater treatment plants, where it would also help remove excess nitrogen and phosphorus—offering a 'one stone, many birds' solution. She reflects on how this discovery emerged unexpectedly from research originally aimed at producing sustainable aviation fuel, underscoring the value of open-minded, collaborative science. The episode ends on a hopeful note, emphasizing that while microplastics are a daunting global issue, innovative, nature-inspired solutions are within reach.