10 -Wort Separation

10 -Wort Separation - Wort Separation Wort Chapter 10...

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Unformatted text preview: Wort Separation Wort Chapter 10 Goldammer Wort Separation Wort Separate liquid extract (wort) from solids (spent grains) Solids contain large amounts of protein, poorly modified starch, fatty materials, silicates, polyphenols (tannins) Want clear wort, want good recovery, want speedy separation Methods of Wort Separation Methods Equipment depends on brewery operation Mash Tun Lauter Tun Europe and NA, larger diameter than mash tun, speeds separation Mash Filter Typically British, false bottom Use filter cloths and press/plates, force through Can use finer grind (more extract) Strainmaster Use perforated pipes to collect wort Mash Tun Mash Combined operations mash, lauter Requires coarse grind so filter bed does not plug Smallest surface area Poor speed, poor extract recovery, but can have clearest wort Well modified malt Cheap Mash Tun Mash After mashing, leave to settle for 20­60 minutes, filter bed develops Open taps slowly Want to ensure filter bed does not collapse (not too fast) Some of particles float, get stratification Sparging with hot water to ash out all sugars (5­80 °C) Sparging Sparging Sparge water sprinkled on top as water level reaches grain bed Continue sparging until collect given amount of wort or until a critical gravity is reached Trying to collect the last bit of sugar results in more silicates and tannins Lauter Tun Lauter Mash transferred to lauter tun Lauter tuns also have false bottoms Wider and shallower than combined mash­ lauter tun False bottom has 8­25% free surface area (area of holes) Can use V wire screen (cheap, works good) Lauter Tun Lauter Lauter tun has rakes to cut into filter bed and accelerate flow Mash is transferred to lauter tun preheated and preloaded with a bit of water for cushion on bottom (several inches above false bottom Bed depth usually 30 ­ 45cm, but can range from 20 ­ 55cm Runoff faster in shallow beds Lauter Tun Lauter Grain filter bed is established first May let rest 15­30 minutes to allow mash rest May perform underlet to set the filter bed properly First wort is recirculated Assists in wort clarification (vorlauf) Also clears out area below false bottom Lauter Tun Lauter Vorlauf may last 15 – 20 minutes After filter bed is established and wort running clear, the “first wort” is diverted to the kettle Some minor solids not a problem Once most of first wort is collected sparging begins Usually leave at least an inch of water on top of the bed Sparging Sparging Temperature within mash should be around 77 °C Sparge water added continuously or in several phases (25, 45, 30%) Knives (rakes) lift and slice, prevents compacting bed and channeling Slow lautering can shut slow and bed will slightly lift Can underlet as well if seriously blocked Mash Filters Mash Not widely used Flush and preheat Pump mash, fill filter Recirculate Collect, sparge Shorter cycle High yield (fine grist) Wort clarity, wheat ?? Strainmaster Strainmaster Patented by AB Rectangular hopper bottomed tank Header pipes with perforations Creates filter bed around pipes Open hopper doors, bed falls out Not as efficient as lauter tun, wort clowdy Sparge Water Sparge pH less than 7 (preferably lower than 6) or extract protein and tannins Water temp 75­77 °C Extract Yield should be 70­75% Degrees of extract = sg wort x liters kgs grain ...
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This note was uploaded on 09/19/2011 for the course FST 3124 at Virginia Tech.

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