Project Elixir: Transforming Brine Into Greener Steel

The Challenge

Every day, the world's desalination plants discharge 142 million tonnes of hypersaline brine into the ocean. This isn't just an environmental footnote — it is a crisis quietly unfolding beneath our seas, stripping oxygen from water and devastating marine ecosystems.

At the same time, the steel industry — particularly in the UAE — faces mounting pressure to decarbonize. Steel manufacturing is responsible for approximately 8% of global CO₂ emissions, and with national net-zero targets on the horizon, manufacturers need scalable, credible solutions.

These two crises appear separate. Project Elixir proves they are not.

The Elixir Process

Project Elixir is MediSun's flagship carbon capture, utilization, and storage (CCUS) initiative, co-developed with strategic partners in the UAE. It takes the brine reject stream from seawater reverse osmosis (SWRO) desalination — a stream typically seen as toxic waste — and transforms it into a valuable industrial feedstock.

The process works in three stages:

1. Precipitation: Brine is treated with sodium hydroxide (NaOH) to precipitate magnesium hydroxide (Mg(OH)₂) — a mineral-rich slurry naturally abundant in seawater.
2. Carbonation via Nanobubbles: Industrial CO₂ — captured from steel plant flue gas — is injected into the Mg(OH)₂ slurry using MediSun's proprietary nanobubble reactor. This converts the compound into hydromagnesite, with a gas-liquid transfer efficiency 630% higher than conventional aeration.
3. Mineral Recovery: The hydromagnesite is dewatered, dried, and processed into high-purity magnesium carbonate (MgCO₃) or magnesium oxide (MgO) — materials in significant demand by the steel, pharmaceutical, and construction industries.

The Numbers

The economics and environmental impact of Project Elixir are compelling. For every cubic metre of brine processed, the system yields up to 13 kg of magnesium carbonate — a material worth $300–$600 per tonne on global commodity markets.

Each tonne of brine processed also offsets 3.1 kg of CO₂, permanently sequestering industrial emissions that would otherwise enter the atmosphere. For a mid-size desalination plant processing 50,000 m³/day, this translates to the permanent sequestration of hundreds of tonnes of CO₂ monthly.

Strategic Context: The UAE

The UAE is one of the world's most desalination-intensive nations, with per-capita water consumption among the highest globally. It also hosts one of the region's largest steel industries. Project Elixir is purpose-designed for this environment — a solution that converts two of the country's most significant industrial waste streams into a circular, revenue-generating asset.

By co-locating WEGen Green systems adjacent to SWRO plants and steel facilities, MediSun enables a seamless industrial symbiosis: the desalination plant's brine feeds the reactor, the steel plant's CO₂ drives carbonation, and the output supplies the steelmaker with the very magnesium it needs for cleaner production processes.

Looking Ahead

Project Elixir is not a prototype — it is a deployment-ready retrofit. MediSun's modular WEGen Green units are designed to integrate with existing desalination infrastructure, making adoption rapid and capital-efficient.

As regulatory pressure on brine disposal and industrial emissions continues to intensify across the GCC and globally, the window for early adoption is closing. Project Elixir offers operators a path from liability to value — turning one of desalination's most stubborn problems into a competitive advantage.

The future of clean water and green steel may, after all, run through the same pipeline.