*

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Note added at 17 Min. (2012-01-18 13:32:56 GMT)
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look here istead of the above link

http://www.ifc.org/ifcext/enviro.nsf/AttachmentsByTitle/gui_...$FILE/Final+-+Breweries.pdf


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Note added at 19 Min. (2012-01-18 13:34:28 GMT)
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Sorry
links are not displayed correctly

Optimal use of raw materials to increase yield and reduce
generation of solid and liquid waste, including:
o Avoidance of poor quality raw materials
o Optimizing milling of the grist
o Optimizing lautering, including sufficient sparging of
the spent grains, to gain as much extract as possible
o Collection and use of weak wort for mashing in the
next brew
o Optimizing clarification through use of a whirlpool as
poor clarification results in a high trub11 volume
o Recovery of the wort from the hot trub
o Recovery of beer from surplus yeast
o Collection and reuse of residual beer. Pre-run and
after-run beer is of high quality, and may be dosed
directly into the beer flow in the filter line. Other

Recirculation of Wort
Before the first wort is run to the brew kettle, it must be re-circulated (known as vorlauf) through the grain bed because it carries finely divided materials from beneath the false bottom. This assists in the establishment of the filter bed and wort clarification.

http://www.beer-brewing.com/beer-brewing/wort_separation/lau...


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Note added at 1 hr (2012-01-18 14:24:27 GMT)
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The Oxford Companion to Beer - Google Books Resultbooks.google.com/books?isbn=0195367138...
Garrett Oliver, Tom Colicchio, Charles Bamforth - 2011 - Cooking - 920 pages
... mash bed in a process called recirculation or by its German name of vorlauf ... Thus, a separate lauter tun allows a brewery to produce more brews per day ...