At the base, they have two metal contacts, which connect to the ends of an electrical circuit. The metal contacts are attached to two stiff wires, which are attached to a thin metal filament. The filament sits in the middle of the bulb, held up by a glass mount. The wires and the filament are housed in a glass bulb, which is filled with an inert gas, such as argon.
Basically, that is a very long answer to come up with the fact that light bulbs are made up of so many types of material that it all but renders them to not be recyclable by some processes and standards.
Light bulbs are regulated as hazardous wastes because they tend to contain toxic heavy metals. If these bulbs are burned or thrown into landfills, the mercury and lead in them can be released into the environment, where contamination problems may occur. Five types of light bulbs are of concern:
- Fluorescent lamps
- High- and Low-pressure mercury vapor lamps
- Sodium-vapor lamps
- High intensity discharge (HID) lamps
- Incandescent light bulbs
Nearly every business, institution and government agency generates waste bulbs that could become a hazardous waste problem if not handled properly. The DNR has developed a policy encouraging bulb recycling that protects the environment.
For more information on recyclable material visit www.wasteawaygroup.com