Part 3: A Classical Approach for Quantifying Mineral Species Precipitation from Aqueous Solutions
By Daniel J. Robinette, P.E.
In Part 2 of this series, the experimental approach for quantifying the precipitation of tricalcium phosphate from industrial water processes was demonstrated for the Robinette Dynamic Precipitation Indicator for Tricalcium Phosphate (RDPI-TcP). The key to the experimental approach is a six-term equation that depends on experimentally derived statistical regression coefficients. It is clear that the time and equipment that would be needed to develop RDPIs for additional mineral species by way of the experimental approach would be quite onerous. Furthermore, the experimental approach limits the validity to the type of industrial water system that the experimental equipment was set up to simulate. For instance, the RDPI-TcP is valid for open recirculating cooling water systems, which are stripped of free carbon dioxide (CO2), but would be invalid for predicting precipitation in a process where CO2 is not removed, such as reverse osmosis.
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