There are two components to Dryer Exhaust: lint and moisture.
Lint probably contains carbon compounds and might be directly usable as an ingredient in making felt. Current terrestrial dryers trap part of the lint with an internal filter, but some is still present in the exhaust.
http://www.newscientist.com/article.ns?id=dn973 http://www.future.org.au/news/July/selfcleaning.html http://www.nowtoronto.com/issues/2007-03-01/goods_ecoholic.php
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