Vanadium (vanadium)

Vanadium (V) is a trace heavy metal that is toxic to aquatic life and humans at elevated levels, affecting the respiratory and nervous systems. It is regulated in effluent at 0.2 mg/L across most discharge modes — a tight limit reflecting its toxicity at low concentrations.

Vanadium enters the environment from steel and ferroalloy manufacture (vanadium is a steel alloying element), the petroleum industry (crude oil and especially heavy fuel oil and petroleum coke contain vanadium, which concentrates in ash and residues), and certain catalysts and chemical processes. The petroleum connection is notable: vanadium is one of the metals concentrated in heavy oil residues and refinery ash.

For recyclers, vanadium is a trace contaminant relevant to specific streams rather than a major parameter. It appears in steel scrap recycling (as a steel alloying element in high-strength and tool steels), and potentially in streams handling heavy oil residues, spent catalysts, or petroleum-derived materials — which connects loosely to pyrolysis oil residues and any processing of oily, petroleum-derived feedstock. Spent catalysts from refineries are vanadium-bearing and are themselves a recycling target for vanadium recovery.

The practical relevance is that vanadium is a trace metal to monitor in steel-recycling and petroleum-residue-related effluent, controlled to a tight 0.2 mg/L. Like selenium, it is less commonly encountered and can be harder to remove than mainstream heavy metals, potentially needing pH-controlled precipitation or adsorption. For most recyclers it is not a routine concern, but steel recyclers handling vanadium-bearing alloy scrap, and any operation dealing with heavy-oil residues or spent refinery catalysts, should be aware of it. Where spent catalysts are processed, vanadium is actually a recoverable valuable metal, turning the contaminant into a product in specialised catalyst-recycling operations.