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Process Control Phosphorus Testing
Posted: Wednesday, February 16, 2011 7:20 AM
Joined: 12/31/2009
Posts: 3

  We are operating a 5 Stage BNR process, and we are using a V-2000 Chemetrics meter to measure phosphorus at our wastewater facility. It uses the stannous chloride method for determining the phosphorus content.

   The last few weeks we have had some kind of high strength waste to come in our facility that our "bugs" love, and we know this because we have to dramatically increase our air to the aeration basins. Our problem is that whatever is in the waste is causing an interference with the phosphorus testing.

    Using the V-2000 meter for process control, we get high phosphorus readings, but when our main laboratory runs the standard methods test for phosphorus, they are well below our .5mg/l limit. Does anyone have an idea as to what could be in the high strength waste that would cause an interference with the stannous chloride method we are using?


Thank You.

Posted: Saturday, February 19, 2011 11:46 AM

I suspect you may have contaminated one or all of the chemicals used to do the Testing, we have had similar problems, took awhile to decide to dump all chemicals, clean all glassware and start with new chemicals.

regards, D.Mak