Abstract
In order to remove 1-hymxyethylidene-1, 1-diphosphonic acid (HEDP) of organic phosphorus scale inhibitors in circulating water effectively, a chemical precipitation method has been used. The influences of parameter on HEDP removing rate, such as species and dosege of chemical precipitation agent, reaction time, are studied, so that the optimal conditions are confirmed. The results show that the HEDP removing rate can be higher than 95% and the relative standard deviation of mesured value is less than 1%, when the mass concentration of FeSO4 is 2 g/L, the dosage of Ca (OH)2 is 0.052 g, and reaction time is 30 min. This method is simple and rapid, has high precision and good reproducibility, can be used to remove organic phosphorus by factory, with broad application prospect.
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