In Limpopo, South Africa, microalgae were added to wastewater ponds to treat sewage from 1,560 homes. Without chemicals or electricity, the process—phycoremediation—cut ammonia by 99%, phosphate by 83%, and nitrogen by 73%, offering a low‑cost, eco‑friendly solution for rural sanitation.
(c) Jonothan Taylor/Unsplash CC0

Microalgae Clean Wastewater Without Chemicals or Power

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In Limpopo, South Africa, microalgae were added to wastewater ponds to treat sewage from 1,560 homes. Without chemicals or electricity, the process—phycoremediation—cut ammonia by 99%, phosphate by 83%, and nitrogen by 73%, offering a low‑cost, eco‑friendly solution for rural sanitation.

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