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Untangling the Effects of Microplastics on Microalgae Growth for Sustainable Bioremediation
Summary
Scientists tested how tiny plastic particles (microplastics) affect the growth of a freshwater algae species that's being explored as a natural way to clean up polluted water. They found that higher concentrations of microplastics slowed algae growth by up to 32%, suggesting there's a tricky tradeoff: while algae might help filter microplastics out of water, too much plastic pollution could actually harm the very organisms we're counting on to clean it up. This matters because microplastics are increasingly showing up in our water supplies, and understanding how nature's own cleanup crews respond to this pollution could help us design better, more sustainable water tre
ABSTRACT The increasing rate of water contamination caused by the presence of microplastics (MPs) has highlighted the importance of finding solutions to mitigate this problem. To investigate this problem, the freshwater microalgal species Chroococcidiopsis cubana was treated with polystyrene (PS) MPs at three distinct concentrations over time, and cell density, growth inhibition, extracellular polymeric substances (EPS), chlorophyll production, and settlement rate were measured. According to the results, the cell density of microalgae declined as PS microplastics concentrations increased, and the maximum inhibition rate (IR) was 31.7% under PS microplastics concentrations of 120,000 number/mL. Our research will enhance the understanding of the impacts of MPs on freshwater microalgae and assist in evaluating their potential role in the removal of MPs from aquatic ecosystems.