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topic 693

Wastewater treatment for glass silvering operation


(1996)

I was wondering if anyone can assist in addressing this problem.

I was recently requested to develop a report for a business using a silver nitrate solution for glass silvering. The company discharges approx. 1,000 gpd process wastewater. Current treatment involves precipitation by adjusting the pH to approx. 8, this is also done to meet discharge requirements. The process solution is pH 10.

I have experience with silver in the electroplating, photo, and jewelry industries, but none of it has been silver nitrate. My first reaction to the treatment process is that at pH 8 the silver will remain in solution and that the pH needs to be raised to drop out silver, is this correct? I believe that ion exchange should work well for this company, are there any problems concerning silver nitrate and ion exchange? Are there any other good methods available for this volume of wastewater to remove the silver?

Any information and assistance is greatly appreciated. The page is great, glad to find it.

Daniel Gates
Industrial Pollution Prevention Program, City of Albuquerque, New Mexico


(2000)

Dear Daniel,

Problems related with silver into waste waters are easily overcome by formation of insoluble salts.

In especially way for my company, I follow up this kind of need for jewellery factories.

I suggest you to try with a NaCl solution.

You could add this solution to your wastes and check the chloride excess with Mohr or Volhard method.

Filtering the final double phase solution with a continuous filter system will be the solution for your problems.

Enjoy!

Massimo Cappellini
- Vicenza, Italy


(2001)

I AM CARRYING OUT AN EXPERIMENT TO DETERMINE THE ENDPOINTS OF SODIUM CHLORIDE WHILE TITRATING IT WITH KSCN. I AM LOOKING FOR INTERFERENCES IN THIS PROCEDURE. COULD YOU PLEASE GIVE ME ANY INFORMATION ON THE VOLHARD METHOD.

MANY THANKS,

GORDON MARK HARFORD
- DUBLIN, IRELAND



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