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Old 09-10-2008, 06:20 PM   #1
McBelch
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Default Chemical coagulants as clarifiers

I am curious to know if anyone has knowledge of the use of alum, generally hydrated aluminum potassium sulphate with the formula KAl(SO4)2.12H2O.
This is used in the coalgulation of turbidity particles in municipal water treatment processes. Ever been done for beer?
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Old 09-10-2008, 07:00 PM   #2
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I wouldn't do it. Too many safer alternatives with no after tastes or soluble aluminum.

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Old 09-10-2008, 07:40 PM   #3
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Whirlfoc is good

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Old 09-10-2008, 08:59 PM   #4
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Gelatin is great! Cheap, easy, effective.

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Old 09-10-2008, 09:11 PM   #5
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The OP is probably well aware of traditional finings. Posting organic alternatives is OT. Please stick to the subject at hand.

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Old 09-11-2008, 02:19 PM   #6
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Alum is relatively soluble in water. Ideally you want something that will settle out. I'm not sure how much it would take. If only a small amount it may be OK. Do they use it for drinking water, or for treating wastewater?

I looked in the Merck Index to see what it said and it mentions purifying water, and hardening gelatin too (also baking powders). Based on that I would say don't use it with gelatin. I suspect it operates in a similar manner as gelatin. It has lots of charge sites on it to attract proteins etc. and eventually becoming a large enough clump to settle out. If you mix it with gelatin, they'll probably bind to one another, effectively neutralizing each others activity

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Old 09-11-2008, 02:48 PM   #7
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There is a patent out there for using alum to prevent chill haze, but I've never seen or read about anyone actually using it.

Sounds like time for an experiment.

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