Why does the phosphate level in a steel mill direct cooling water system remain low even after daily dosage of phosphate based corrosion inhibitors? The COC of the system is about 8 cycles. Please enlighten me the possible faith of the phosphates being dosed in the system. Thank you.
The low P contents might be caused by the determination method. If the data you obtained is accurate enough, part of the P might form suspended solids with Cations such as Ca2+ and Mg2+
Phosphate maybe interact with counter ions or NOM and form a precipitate.
Phosphate may be precipitating or if you have any microbial activity, it will be quickly taken up as a limiting nutrient.
Have you seen the water quality analysis? If the water contains Calcium ions, it would precipite as Ca3(PO4)2. See table in the link below for solubility limits
https://en.m.wikipedia.org/wiki/Solubility_table
High concentration of orthophosphate in cooling water system may be precipitated and increasing scaling index and it acts as nurturant in microorganism growth
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