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16 Waste and Recycling Computers and Electronics Computers and electronics contain hazardous materials. All unwanted university computers and electronics must be sent to Iowa State University Surplus for resale or recycling. Cosmetics and Personal Items Cosmetics may be discarded in the trash, with the exception of aerosols and flammable liquids. Submit a waste removal r equest for disposal of flammable cosmetics. See section “Chemicals in Laboratories and Other Locations.” Cylinders and Propane Tanks Many compressed gas cylinders may be returned to the manufacturer through Chemistry Stores. EH&S collects lecture bottles and propane cylinders for other types of cylinders contact Chemistry Stores or EH&S for assistance. See Section F “Chemicals in Laboratories and Other Locations.” Drugs and Controlled Substances The Drug Enforcement Agency license holder is responsible for the security, return, or destruction of their controlled substances. The Iowa State University Purchasing Department maintains the controlled substances purchasing policy . See section “Chemicals in Laboratories and Other Locations.” or contact EH&S for assistance. Empty Chemical Bottles Empty chemical bottles are collected by EH&S. (See Sharps and Glass Disposal Guidelines. ) Film, Negatives and X-rays Expired or unused filmmay contain silver. Bulk film should be reclaimed through a silver recovery company or EH&S. Fluorescent Bulbs and High Pressure Lamps Fluorescent bulbs and high pressure lamps may contain mercury. All university fluorescent bulbs/lamps must be recycled through central stores. Bulbs must be packaged in boxes or cardboard tubes to prevent breakage and contain the bulb if broken. See section “Universal Wastes.”