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Reverse osmosis desalination plants are to deal with scaling problems which can
lead to the membrane destruction. This project studied the delay in CaCO3 precipitation
during ozonation experiments conducted on synthetic seawater. A reliable precipitation
test for seawater was developed since the reproducibility of the experiments was poor.
Empirical models for bromate formation were used to give a bench mark for the ozone
experiments. The main parameters to control bromate were the applied dose, contact
time and the water pH. Synthetic seawater samples were ozonated in a batch reactor
under satisfactory conditions to achieve a significant retardation in CaCO3 precipitation.
Sonication was tested to cause a pH depression to a lower levels were the bromate
formation is suppressed, but the acidification did not occur.
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