........of scrap metal

Нет, более широкое понятие.

recycling (r-sklng)
The collection and often reprocessing of discarded materials for reuse.
Сбор, сдача, переработка - всё это обзывают recycling.
Мне город постоянно напоминает, чтобы я не забывал реcайклать пластмассу, банки-склянки, бумаги. Я ведь не обрабатываю, а всего лишь собираю и сдаю.

Many have found new ways to make extra money, engaging in a kind of creative economy of necessity. One non-college-educated woman in Columbus, Ohio noted, “I make and earn extra money, like yard sales.” They talk about the ingenuity required to make or save money — like collecting bottles or scrapping unwanted metal.

http://www.topix.com/forum/food/T7PHTGBN20HG1TNG0

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http://recycling.about.com/od/Recycling/ht/How-To-Be-A-Scrap-Metal-Collector.htm

collection - видимо, сбор