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Fluorescent lamp recycling is the recovery of the materials of a spent fluorescent lamp for the manufacture of new products. Glass tubing can be turned into new glass articles, brass and aluminium in end caps can be reused, the internal coating can be reprocessed for use in paint pigments, and the mercury contained in the lamp can be reclaimed and used in new lamps.〔''Fluorescent Lamp Stewardship Initiative'', Alberta Environment, 2000, ISBN 0-7785-1730-6〕 In the United States, about 620 million fluorescent lamps are discarded annually; proper recycling of a lamp prevents emission of mercury into the environment, and is required by most states for commercial facilities.〔(Release of Mercury from Broken Fluorescent Bulbs ), State of New Jersey Division of Science Research and Technology, Feb. 2004, pg. 1〕 The primary advantage of recycling is diversion of mercury from landfill sites; the actual scrap value of the materials salvaged from a discarded lamp is insufficient to offset the cost of recycling.〔Alberta Environment〕 ==Mercury in lamps== The amount of mercury in a fluorescent lamp varies from 3 to 46 mg, depending on lamp size and age.〔Page 183 of http://www.chem.unep.ch/MERCURY/Toolkit/UNEP-final-pilot-draft-toolkit-Dec05.pdf〕 Newer lamps contain less mercury and the 3–4 mg versions are sold as low-mercury types. A typical 2006-era T-12 fluorescent lamp (i.e. F34T12) contains about 5 milligrams of mercury. In early 2007, the National Electrical Manufacturers Association in the US announced that "Under the voluntary commitment, effective April 15, 2007, participating manufacturers will cap the total mercury content in CFLs under 25 watts at 5 milligrams (mg) per unit. CFLs that use 25 to 40 watts of electricity will have total mercury content capped at 6 mg per unit." Only a few tenths of a milligram of mercury are required to maintain the vapor, but lamps must include more mercury to compensate for the part of mercury absorbed by internal parts of the lamp and no longer available to maintain the arc. Manufacturing processes have been improved to reduce the handling of liquid mercury during manufacture and improve accuracy of mercury dosing. Mercury-free discharge lamps have considerably lower production of visible light, about half; mercury remains an essential component of fluorescent lamps. 〔 A broken fluorescent tube will release its mercury content. Safe cleanup of broken fluorescent bulbs differs from cleanup of conventional broken glass or incandescent bulbs. 99% of the mercury is typically contained in the phosphor, especially on lamps that are near their end of life.〔Floyd, et al. (2002), quoted on page 184 of (Toolkit for identification and quantification of mercury releases ) (PDF)〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Fluorescent lamp recycling」の詳細全文を読む スポンサード リンク
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