Thanks Terry, i just have a quick question: 1) What was your Aluminium concentrations you dealt with? 2) What was your source of ortho-P and at what concentration ratio did you add it wrt Al ? 3) Will 20 minute contact time be enough or can I make it 5 minutes?

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Thanks Terry, i just have a quick question:

1) What was your Aluminium concentrations you dealt with?

2) What was your source of ortho-P and at what concentration ratio did you add it wrt Al ?

3) Will 20 minute contact time be enough or can I make it 5 minutes?

 

 

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under 5 Minutes. There is a pretty simple way for you to get an idea of your water. You can do this with a simple plate mixer and a 1 liter beaker. You will need a turbidimeter.  If you have a turbidity cell it is easier.  Filter 1 liter of your water. Add  your water to the beaker and get it mixing measure the turbidity either by pulling  a sample or reading the output from the meter attached to the turbidity cell. Drop in 20ppm of o-PO4 per 1ppm of Al. It is an overdose but you are looking for a rate of reaction. At 80% of the maximum turbidity, you have your reaction time.  Kinetics at its finest. My email is scheurman.terry@appliedspecialties.com might be easier than messaging but  glad to help either way. 

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The bulk of the Al concentrations were under 1ppm and it was all soluble. The PO4 source was trisodium phosphate because of cost. The reaction is rather fast at temperatures around 70F.  We were able to increase the effective reaction time by using a tank or lagoon as a wide spot in the process stream.  Low levels of soluble Al are very disruptive to RO membranes.  You can give it a small test using a fish tank and a packed column to replicate  a MM  filter.  Hope this helps.

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