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While doing some unrelated research, I found the following page and article describing Single-stream recycling:
Waste Management - Single stream recycling [1]
Recycling Today - "Single-Stream Recycling Generates Debate" [2]
These pages support some of the un-cited content in the article, so I will go ahead with adding them to the references.
Matt ( talk) 19:14, 25 July 2008 (UTC) reply

Moved from article: These are results from over 8 years ago and no technological advances that have been made in over the past 8 years are described in this " Disadvantages " section. —Preceding unsigned comment added by 12.101.42.58 ( talk) 12:45, 13 April 2009 (UTC) reply

not sure how to phrase this:

an additional advantage to single-stream recycling is that mix-sorted materials no longer pose a problem. — Preceding unsigned comment added by Ididerus ( talk • contribs) 13:17, 24 August 2013 (UTC) reply