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More information is always good if you are trying to get the right answer. What are your starting concentrations? What are your discharge limits? What is the volume or flow rate? What other compounds are in the water that could interfere? Normally Lead is precipitated as a hydroxide. Cadmium could be precipitated as either a hydroxide or as a sulfide. In order to get the right answer you will need to provide more information.

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Keep in mind that I have three objectives; 1) to remove Cd and Pb ions from the wastewater, 2) to remove them in a form that is stable (refractory) so that the sediment will not release ions in the presence of acid during the TCLP test, and 3) to be able to use the without sophisticated or specialized equipment. In other words, I want to be able to use batch treatment regimen in any container or tank that is appropriate to the volume of water I wish to treat.  The product I am currently using does that.  Concentrations in the wastewater vary from 2 mg/L to 200 mg/L.  Target concentrations for the treated water are 0.02 mg/L or lower necessary to meet stringent local POTW discharge limits.

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