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USGS Report: Obsolete Computers, "Gold Mine," or High-Tech Trash?
Obsolete computers contain significant amounts of recoverable materials including metals from wires and circuit boards, glass from monitors, and plastics from casings (fig. 1). For example, 1 metric ton (t) of electronic scrap from personal computers (PC's) contains more gold than that recovered from 17 t of gold ore.1 In 1998, the amount of gold recovered from electronic scrap in the United States was equivalent to that recovered from more than 2 million metric tons (Mt) of gold ore and waste.2
The amount of computer waste increases annually as electronic systems play an increasingly important role in all aspects of technology, but significant amounts of material used in the devices are not recovered. Because microchip development is so rapid (Hamilton and Takahashi, 1996), users are able, every 18 months, to purchase computers that are twice as powerful at the same price as those currently available (Jung, 1999). This cyclic trend (with its inherent surplus of old computer components) has been sustained for nearly 20 years of recent computer history. To meet consumer demand, the computer and electronics industry has become the largest manufacturing employer in the United States, representing 11 percent of the gross domestic product and growing at an annual rate of 4 percent (Porter, 1998).
The quantities and types of materials used in computer products to meet this demand are great and varied, as is the potential to recover these computers and their materials for reuse, remanufacturing, and recycling. In 1998, nearly 43 million new PC's and notebook computers were purchased by consumers in the United States; and it is estimated that in the year 2003, nearly 70 million computers will be purchased by consumers in the United States (National Safety Council, 1999).
In 1997, it was estimated that between 1985 and 2005, approximately 325 million PC's would become obsolete in the United States (Jung, 1999). In a business environment, the useful life of a PC is about 2 years, while in homes PC's are used from 3 to 5 years (Jung, 1999). Between 14 and 20 million PC's become obsolete every year in the United States. About 75 percent of these obsolete computers are not discarded because their owners perceive them to be valuable (Goodrich, 1999); a portion of these will not be recycled. For every three computers purchased in the United States, two will be taken out of service, and this ratio is expected to increase to 1:1 by 2005. It is projected that by 2005, a total of 680 million PC's will have been sold worldwide. Of that total, it is estimated that 150 million computers will be will end up in landfills along with unreclaimed portions of the 150 million recycled computers (Hamilton and Takahashi, 1996).
Figure 2 is a generalized materials flow diagram that shows what happens to obsolete PC's and their components.Recycling Flow Figure 2 is a generalized materials flow diagram that shows what happens to obsolete PC's and their components. (Download complete report in PDF format (156K).
This figure includes:
Computers and other electronic devices represent a large resource of potentially recoverable material. Table 1 lists selected types and amounts of material reportedly recovered in 1997 and 1998 from computer and other electronic scrap. In 1998, about 2.6 million PC's and notebook computers were recycled in the United States, and this number is expected to quadruple by 2003 (National Safety Council, 1999). Recyclers received nearly 50 percent of electronic products directly from manufacturers; about 30 percent from large companies that utilize electronics in their business; and the rest from small companies, government offices, and individuals (National Safety Council, 1999).
Some scrap is unwanted because of low precious metal content and the potentially hazardous nature of some of its materials. For example, the presence of lead in some electronic scrap prevents it from being placed in a municipal landfill. Some refiners actually have to charge as much as $1 per pound to process the scrap because of these deleterious materials (Broughton, 1996).
Some scrap was exported to Taiwan for open burning and chemical processing; however, the Taiwanese government had reportedly become increasingly concerned about the environmental damage caused by this practice (Broughton, 1996). Chinese and other Asian consumers pay 15 to 20 cents per pound for electronic scrap on the U.S. West Coast (Goodrich, 1999). Environmental regulations are less strict (or not enforced), and labor costs are much lower in some of these countries.
The metals contained in PC's commonly include aluminum, antimony, arsenic, barium, beryllium, cadmium, chromium, cobalt, copper, gallium, gold, iron, lead, manganese, mercury, palladium, platinum, selenium, silver, and zinc. Eight of these metals (shown in bolded type) are listed as hazardous by the Resource Conservation and Recovery Act (RCRA), one of the Federal laws that control the disposition of waste in the United States. This law prohibits companies from incinerating some types of electronic scrap or disposing of it into municipal landfills.
|Michael Meuser bootstrapped his way into the salvage and recycling business in the early 1980s. He began with building deconstruction and scrap metals and then moved into electronics, computer and telecommunications scrap where he learned to recover gold and other precious metal.|
|Michael tells his story, provides resources and offers his advice at his website, RecyclingSecrets.com, and his blog, Recycling Secrets Blog. Recently Mike completed the eBook How to Make Money in the Home Based Salvage and Recycling Business. It is a chronicle of his experiences, successes and failures in the business. Also, you can follow Michael on Twitter.
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