Can’t the total iron in the circulating water be removed? Seeking advice from experts
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It’s a newly installed system; before applying the pre-coating, the total iron level was always below 0.5. After the pre-coating was applied, the total iron level wouldn’t drop, remaining around 2. Numerous attempts at intensive treatment still failed to reduce this level. We use polycarboxylate scale inhibitors; we’re not sure what specific chemicals were used for the pre-coating.
How much additional iron and water should be added? How is the pre-coating effect?
What is the iron content after cleaning during the pre-coating process? What is the maximum? It’s very likely that the replacement wasn’t done properly at that time. Have you measured ferrous iron?
The chemical used during pre-coating is basically the same as that used during operation, only in higher dosage. The cleaning step during pre-coating is quite critical; inadequate cleaning can directly affect the success or failure of pre-coating.
According to you, it’s likely that the pre-coating is not of good quality, and the amount of scale inhibitor added is high with a low concentration factor； It is recommended to increase the concentration ratio, reduce or discontinue the addition of scale inhibitors, increase the bypass filtration flow rate, and then carry out replacement.
Check the quality of the water used for hydration and conduct an analysis! ! ! ! ! ! ! !
What’s the current pH level? Was sulfuric acid used for cleaning?