RCRA Hazardous Waste (US, 40 CFR 261)
Spent metal pickling solutions and sludges are K-listed wastes from iron and steel production. The specific K-code depends on whether the material is from blast furnace, steelmaking, or rolled steel operations.
Also searched as: pickling acid, steel pickling waste, acid dip liquor, pickling bath
RCRA classifies waste by source, process, and characteristics — not just material. Pick the row that matches how your pickle liquor & steel pickling waste arises; each coded row links to the full waste code definition under 40 CFR Part 261.
Spent pickling liquor (steel mills)
Spent pickle liquor generated by steel finishing operations of facilities within the iron and steel industry (SIC Codes 331 and 332)
Sludges from pickling operations
Classified as K-listed industrial waste
Source: 40 CFR Part 261 — Identification and Listing of Hazardous Waste
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