Waste from the chemical and electrochemical industries often includes spent catalysts, plating sludge, contaminated filters, and solution residues. These materials frequently contain precious and base metals such as platinum, palladium, silver, and copper. Due to their hazardous nature, such waste requires specialized handling and treatment. Recovery typically involves chemical extraction, electrolysis, or thermal processes to reclaim valuable metals. This type of waste is common in manufacturing plants, laboratories, and plating facilities where metal use is routine.