Hello,
     
     While I'm not familiar with the use of DTC, I have worked with mag 
     hydroxide slurries & sludges a fair amount. One way to improve 
     settling is the use of polymer flocculants, as suggested in another 
     reply message. 
     
     Polymers work very well; however, you must determine the correct type to 
     use as well as the optimum process parameters for your application.
     
     Testing is required to determine the correct flocculant and dosage. 
     Parameters for flocculants include charge (anionic, cationic, or neutral), 
     charge density, and molecular weight. Polymer solution concentration 
     (usually 0.25 to 0.50 wt. percent) can affect performance. Dosage level 
     (measured in ppm) is obviously very critical to performance. 
      
     If you are considering giving polymers a try, I recommend bringing in  
     reps from a couple of chemical companies who should be more than happy 
     to spend a day conducting bench-level tests for you at no charge. After 
     that, the best combination can be tested on a larger scale.
     
     Regards,
     
     Denis Mori
     Hewlett-Packard
     [log in to unmask]
     
     
     
______________________________ Reply Separator _________________________________
Subject: Mag. hydroxide & DTC in waste water
Author:  Non-HP-BoydAnderson ([log in to unmask]) at HP-Roseville,mimegw3 
Date:    4/24/97 6:29 AM
     
     
Does anyone have any experience using magnesium hydroxide as a neutrializer 
prior to adding DTC in a waste water treatment application?
     
Will the DTC also remove the magnesium, thus using more DTC than would 
normally be required?
     
We are using mag. because it gives us a much heavier partical that settles 
faster.  If anyone has found something else that makes a heavier sludge 
with DTC would you provide some feedback?
     
Thanks,
     
B.A.
     
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