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Some hazardous wastes contain certain precious metals, including gold, silver, platinum, palladium, iridium, osmium, rhodium, and ruthenium. There are reduced requirements for recovering these wastes as long as there is an economically significant amount of metal and it is efficiently recovered. People that handle special lead acid batteries prior to recycling are not subject to hazardous waste regulations to encourage recycling. However, the recycling facility owners are subject to regulations similar to hazardous waste treatment, storage, and disposal facilities when storing batteries prior to treatment. Burning hazardous wastes such as used solvents for energy recovery can cause air emission hazards. So there are specific operating standards for these units. Combustion units require a permit and they must maintain performance standards according to the boiler and industrial furnace regulations.