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In general I would agree with Mr. Miller. We switched to Mg hydroxide
on all our batch treatment processes here. It is MUCH more cost
effective that sodium hydroxide simply due to its alkaline content
pound-for-pound. Magnesium hydroxide improves solids settling. You
do not have to worry about over shooting pH either which can happen
very easily with sodium hydroxide if it is being added manually.
We continue to use sodium hydroxide in our continuous waste water
treatment system because of the ease of use issues mentioned below as
well as kinetics. Magnesium takes longer to react because it is in a
solid slurry and as the dissolved OH is consumed additional particles
of MgOH must dissolve. We had to purchase a special mixing drum pump
tube from Lutz that allows us to mix the slurry before we pump it for
use in a batch treatment procedure.
Michael Holan
Process Engineer
Continental Circuits Corp. of Texas
______________________________ Reply Separator _________________________________
Subject: Re: Mag. hydroxide & DTC in waste water
Author: "Richard R. Miller" <[log in to unmask]> at INTERNET
Date: 4/25/97 12:11 AM
Mg hydroxide is primarily utilized to increase "weight" to the solids formed,
thereby improving the settling characteristics of "over-loaded" systems.
There are products on the market that combine Mg with DTC, or other heavy ions,
to achieve this same affect.
A more cost effective, and easier approach, would be to utilize
"solids-recycling" from your sludge holding tank to your primary reaction tank.
This will provide, the "weight", to improve your settling, as well as, reduce
your DTC, flocculant, and alkalinity requirements by 20-50%. Also, this will
allow you to use sodium hydroxide, in place of, Mg, or Ca Hydroxide (cost/ease
of use savings).
Rick Miller
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