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Plastic pollution has been a serious problem since the rise of fossil fuel-based manufacturing. As tiny plastic particles find their way into something as essential as drinking water, the world needs a solution quickly.

The answer may be simpler than we expect. Researchers testing a salt-based extract from Moringa oliefera seeds were able to remove over 98% of microplastics from drinking water. The study published in ACS Omega showed that the simple filtration system could be adapted for water treatment facilities at a lower cost and requires less energy.

‘Miracle Tree’ produces miracle seeds

The Moringa oleifera is a tropical tree native to parts of South Asia. Today, it’s cultivated on a global scale. Thriving in harsh, drought-prone regions, this “miracle tree” has been used to treat hundreds of conditions. Healthline reported that it contains 90+ bioactive compounds that help combat everything from inflammation to stress. A 2023 study in MDPI showed medicinal properties could be utilized in nearly every part of the tree, from its leaves to its roots.

However, the solution to the plastic problem comes from its seeds. Researchers ground and mixed the seeds with a salt solution to pull out positively charged proteins. This mix attracts impurities, including microplastics, like a natural magnet. Clumping and binding with the impurities in a process called “coagulation,” they then sink to the bottom.

Microplastics removed from drinking water

Researchers tested this plant-based method against the industry-standard chemical alum: aluminium sulfate. The moringa extract worked across a wider range of conditions than alum, demonstrating reliability in real-world applications. As concerns grow over the long-term impact of chemicals used in water treatment, there is a clear need to shift toward safer alternatives.

Simplifying the filtration process can significantly reduce both costs and energy demands typically required on an industrial level. This approach enables communities lacking resources to have an effective solution for plastic pollution.

Treating plastic pollution is a global problem

Developing countries face major environmental and health threats from plastic pollution. A 2024 study in Science Direct showed 60% of global plastic consumption and production comes from countries lacking proper quality control. A 2023 study in MDPI revealed that even where infrastructure exists, it’s limited and overwhelmed. Facing 120 million tons of waste annually, the situation suggests pollution is widespread and underreported.

Offering a cheap and efficient option, Moringa oliefera seeds could be an invaluable solution. But it’s still not a perfect system. The seed extract is an organic material. That means proteins and fats can remain in the water after filtration.

A 2025 study in Scientific Reports found organic matter reacting with disinfectants like chlorine is linked to health risks, including cancer. Also, stored water would be susceptible to bacterial regrowth and become contaminated over time. Researchers on the study believe this is an area of ongoing work that requires more research.

Microplastics are everywhere. With inconsistent water treatment, less monitoring, and weaker waste systems, exposure is high and poorly controlled. Moringa oleifera isn’t a flawless fix, but it’s a promising study. The seeds could eventually work alongside modern systems, bringing us closer to tackling the complex problem of plastic pollution in our water.