Flocculant for settling water. Any chem majors out there? - Mountain Buzz
 

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Old 02-23-2011   #1
 
slamkal's Avatar
 
vancouver, Washington
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Flocculant for settling water. Any chem majors out there?

Trying to avoid having water sit overnight to settle,to maximize life of water filter carbon filters. One of the methods is to add a Flocculant to get the particles to clump and fall to the bottom

Will probably use a 5 mil bag filter for first stage following flocculation. Plus the bag can easily be washed and reused

I've heard use alum but don't think it's a good thing to add unless it comes out with carbon filtration ( like bleach does ). I'm afraid of introducing aluminum into water supply

Also read chitosan if you don't have allergies to shellfish. Seems like this would be the most natural method. Any idea where I could get some in useful and economical quantities?

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Old 02-23-2011   #2
 
Durango, Colorado
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I've always just let water settle overnight, then decant into clean buckets to pump. Alum adds a funny taste to water, so we try to avoid using it as much as possible. I think I've used alum once in my three seasons working in the southwest. Admittedly not that long, but it gives an idea. You may not have wanted that answer as you were specifically looking for info on flocculants.
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Old 02-23-2011   #3
 
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The pulp from Prickly Pear Cactus is a natural flocculant, that will settle the sediment fairly well. You have the problem of bits of the pulp floating around in the water but just strain it through a bandanna and you get clear water ready to filter. I have used it in its natural raw state mashed up, but i remember reading an article once about boiling the pads to extract the musalege which became a very effective flocculent and even had properties that helped with purification. They were doing studies to help with water supply in developing countries.
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Old 02-23-2011   #4
 
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[QUOTE=slamkal;214367]I've heard use alum but don't think it's a good thing to add unless it comes out with carbon filtration ( like bleach does ). I'm afraid of introducing aluminum into water supply[QUOTE]

The aluminum (as alum) ends up mostly in the mud at the bottom of the bucket - it's a flocculent after all.
Don't sweat the Al exposure, just think of what you put your lips against for every sip of your PBR.
Good alum use methodology can be found at Drifter Smith on Alum Alum Use - Grand Canyon Private Boaters Association
Jerry
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Old 02-24-2011   #5
 
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ditto to malloypc- alum is generally used in US water treatment facilities, so if you drink city water, you're probably already being exposed to it. Also, it's a main ingredient used in pickling, so if you eat pickles...

The prickly pear method sounds really interesting though.
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Old 02-24-2011   #6
 
Davis, California
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Calcium hydroxide?
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Old 02-25-2011   #7
 
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Quote:
Originally Posted by slamkal View Post
Trying to avoid having water sit overnight to settle,to maximize life of water filter carbon filters.
This is a easy, quick and cheap way to pre-treat silty water: https://www.mountainbuzz.com/forums/f...ilt-33796.html
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Old 02-26-2011   #8
 
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I've never used Alum myself, but have read that it work best if you mix it into a smaller size bottle, shake hard, then pour that into the buckets you want to settle.

Also, did you find that filter bag set up with the ring and strap to hang it, or is that a self modification. I'd buy one of those if I knew where to look.
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Old 02-27-2011   #9
 
Grand Junction, Colorado
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Flocculant for settling water. Any chem majors out there?

Mogur
Regarding that green prefilter bag: I visited several vacuum shops here in GJ but could not find anything like this. Any suggestions on where else I might find one of these?

R
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Old 02-27-2011   #10
 
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What do people do with the alum sludge?

Is your green bag something like this?

http://www.centralvac.com/mm5/mercha...gory_Code=BAGS
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