Researchers at the Institute of Science and Technology at São Paulo State University in Brazil have discovered a method to eliminate microplastics from drinking water using extracts from Moringa oleifera seeds. This natural coagulant leverages the plant’s properties to achieve results that match or exceed those of conventional chemical agents like aluminum sulfate.
The approach avoids leaving harmful residues, offering a biodegradable alternative for water treatment. Published in ACS Publications, the research highlights Moringa’s potential as an affordable, eco-friendly option for purifying water supplies worldwide, which could improve public health by reducing microplastic exposure.
The study, titled ‘Removal of Microplastics from Drinking Water by Moringa oleifera Seed: Comparative Performance with Alum in Direct and in-Line Filtration Systems,’ demonstrates how the seed extract neutralizes the negative charges on microplastics and other pollutants. This causes them to form larger clusters through flocculation, making them easier to filter out with sand-based systems.
Tests focused on polyvinyl chloride (PVC) microplastics, which pose health risks as mutagens and carcinogens. In lab experiments using jar tests, Moringa performed similarly to aluminum sulfate but excelled in alkaline conditions, proving its versatility for various water treatment scenarios.
To mimic real-world degradation, scientists exposed PVC particles to ultraviolet light before analysis. They employed scanning electron microscopy to count remaining particles and used high-speed cameras and laser tools to measure floc sizes, confirming the extract’s effectiveness in simulated natural environments.
Unlike non-biodegradable aluminum or iron-based coagulants that can introduce toxicity and face regulatory scrutiny, Moringa provides a sustainable solution. Ideal for remote or underserved areas without advanced infrastructure, this edible plant seed minimizes environmental impact while tackling microplastic pollution in drinking water.
