Rhenium (Re) in Water Treatment

Quick Answer

Rhenium (Re) is a transition metal with atomic number 75. PubChem lists its standard state as solid and its relative atomic mass as 186.207.

Rhenium is not a common target in ordinary water treatment but may occur in mining or specialized industrial wastewater. Total versus dissolved concentration, oxidation state, pH and complexing agents should be measured before evaluating precipitation, adsorption, ion exchange or membranes.

Interesting Facts

• Rhenium was the last stable element to be discovered in nature and is among Earth’s rarest crustal elements.
• Its exceptional high-temperature strength makes rhenium valuable in nickel-based superalloys for turbine blades.
• In oxidizing water it can occur as perrhenate (ReO₄⁻), an oxyanion whose behavior differs from particulate or reduced rhenium.

Water-treatment Design Implications

An element name alone is not enough to select treatment equipment. Confirm chemical form or speciation, total and dissolved concentration, pH, alkalinity, competing ions and the product-water target. Send the water-analysis results to Watermart to identify additional testing and shortlist processes before equipment is specified.

Summary Data Sources

• PubChem — Rhenium
• IUPAC Periodic Table of Elements
• WHO — Chemical hazards in drinking-water

Practical Reference for a Water Analysis

Ask what chemical form was measured. Total and dissolved results should be distinguished, and oxidation state or compound class may also be essential. Different species can carry different charge, toxicity, solubility, and affinity for treatment media.

Validate treatment on the actual matrix. A process name is not a performance guarantee. Competing ions, organic ligands, redox conditions, pH, suspended solids, and required recovery can change removal sharply. Use bench or pilot testing for unusual industrial streams, and make a mass balance for concentrate, sludge, regenerant, or spent media.

Do not invent a drinking-water limit from the periodic table. A health value applies only to the specified substance, route, averaging period, and jurisdiction. Check the current Indonesian requirement and the intended reuse or discharge permit before setting the design target.