HCTGS v29: Brine to Wealth

ABSTRACT — HCTGS v29: Brine to Wealth HCTGS v29 — Brine to Wealth documents a Mini-HCTGS desalination symbiont: a compact gravity-thermal cascade docked to the discharge line of an existing reverse-osmosis (RO) plant, converting the brine that desalination currently pays to dispose of into a stream of minerals, recovered fresh water, and on-site energy. Because the host RO plant has already concentrated the seawater, the buildable core of this architecture draws on proven mineral chemistry and requires none of the unvalidated tower physics flagged elsewhere in the HCTGS series; the full vortex tower is presented separately as the scale-up path, not as a precondition for the pilot. The mineral cascade is driven by a magnesium combustion thermal stage. Combustion gas reaches 1,500 to 2,200°C, but the resulting process steam is capped near 100 to 400°C by the latent heat of vaporisation; staged precipitation across descending temperatures separates the fractions in sequence. From a representative brine of about 2,580 mg/L magnesium, a pilot recovers on the order of 363 tonnes per day of magnesium oxide (the Mg-to-MgO mass factor 1.658), together with bromine, potassium chloride, and boron trioxide — an indicative combined mineral revenue of EUR 130 to 145 million per year per pilot. Because global MgO demand is finite, ten such plants at full output would approach the entire world MgO market; the architecture therefore pivots surplus magnesia into Sorel-cement feedstock through NC-BTW-1, an on-site additive manufacturing standard (OSAM) that consumes the mineral locally rather than flooding a commodity market. Energy is recovered as heat, not multiplied electrically: the Gain Output Ratio (GOR 8 to 15 at pilot, 25 to 35 at full tower) measures thermal reuse across multi-effect stages, while an organic Rankine cycle yields roughly 2 to 3 MW from about 25 MW of cascade heat. Magnetohydrodynamic extraction is applied only to the hot, electrically conductive, potassium-seeded combustion gas — never to the cool condensing steam. Freshwater recovery runs at 70 to 80 percent of the processed brine. High-temperature storage uses a Gen3 chloride-salt medium (NaCl/MgCl₂/KCl, ~700°C). Part 11 documents the AI-cluster and semiconductor-fab case: from one installation the symbiont supplies cold-water cooling (coastal deep-water/SWAC, or rock-cavern heat sink toward PUE ~1.0 in the salt-lake variant), closed-loop fresh water for water-positive data-centre operation, a boron- and silica-lean high-purity distillate that serves as a pre-feed removing the desalination front-end of a fab's ultrapure-water plant (not finished UPW), mineral revenue, and an ORC power offset — a low-cost, co-investable entry point with the cascade itself a natural fit for AI process control. The salt-lake sister variant adds bankable gravity hydropower from the elevation drop (≈70–80 MW up to ~1.8 GW) and, at glacier elevation, a fresh-snow albedo mechanism (Part 12) that raises catchment reflectivity from roughly 30 to 80 percent to slow glacier melt. All novel contributions are placed on the public record of prior art as of the Zenodo publication date under CC BY-NC-ND 4.0. All parameters are theoretical design estimates requiring independent validation. Ilir Mehmetaj | Independent Concept Developer | CC BY-NC-ND 4.0 | 2026