Closed Loop Water Treatment - Corrosion
I have been struggling with this closed loop over the last 6 months as the chemistry is completely out of control.
It is fed with RO permeate as the coolant with a total volume of 150 m3. Average water consumption is about 1m3 per day.
The loop is used to cool the fume hood of a copper smelter's convertors.
We are treating the water with a molybdate-based corr inhibitor along with a non-oxidising glut biocide. We also have a phosphate/polymer based antiscalant in place.
Recently, the RO plant failed and a high salt passage was experienced. This led to the conductivity/TDS increase in the loop.
Temperatures in the loop range between 60-80 deg C.
Can someone help me figure out why there is such a high amount of corrosio ?