Direct lithium extraction from Seawater: Techno-Economic prospects and ecosystem risks for Egypt’s coasts

Global electrification has driven unprecedented lithium demand, but conventional extraction harms water, land, and carbon budgets. Seawater holds 230 billion t of Li (0.1–0.2 ppm) and could convert lithium from scarce critical mineral to bulk commodity. We integrate techno-economic and life-cycle analyses of four emerging direct lithium extraction (DLE) technologies—manganese/titanium oxide sieves, KAUST’s LLTO electrochemical membrane, Stanford’s energy-positive redox electrodialysis, and Chicago’s olivine-phosphate intercalation. DLE delivers 70–90% Li recovery in hours versus 18–24 months for brine evaporation, at projected costs of $4 000–7 000 t − 1 LCE versus $9 100 t − 1 for conventional brines, while slashing carbon and freshwater footprints. Key marine hurdles remain: 60 000:1 Na:Li competition, rapid biofouling (>30% capacity loss within weeks), and material corrosion. Co-locating DLE with seawater reverse-osmosis reject streams concentrates Li 1.5–2.5 × and valorizes waste brine, offering blue-economy opportunities for Egypt’s Red Sea and Mediterranean coasts. Real-sea pilot trials and ecological engineering of antifouling, durable materials are critical next steps.