What are the effects of too low calcium hardness in circulating water?
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What are the effects of too low calcium hardness in circulating water? Please have water treatment experts respond. Thank you!
This post was last edited by qugd on 2016-9-18 at 13:29. Is there anything wrong with low hardness in recycled water? I think it’s a problem that the hardness of the circulating water is too high. It is likely that you believe the reduced amount of scale inhibitor used has led to lower expenses for purchasing it, which in turn has affected the profitability of your scale inhibitor supplier.
Is the poster from the south? The hardness is slightly lower, and the system’s tendency to corrode increases significantly
What is the theoretical basis for the accelerated corrosion?
When calcium ion levels are too low, the tendency to corrosion increases
Be careful of corrosion and microbial issues.
Calcium and alkalinity must not be too low, otherwise corrosion will occur! !
A low level of calcium ions in itself does not have a significant impact; it actually helps to control the tendency for scaling in circulating water (in circulating water systems where calcium-based scale forms)； Some of the commonly used scale and corrosion inhibitors require a certain level of calcium ions in order to form a sufficiently complete film, thereby ensuring corrosion inhibition in the circulating water system. The claim that low calcium levels alone can cause corrosion is a bit far-fetched; other factors in the water body need to be taken into consideration as well.
The main factor causing corrosion in water bodies is the presence of dissolved oxygen in the water; it has little direct relation to calcium. If calcium levels are low, corrosion is severe; boiler water must not have hardness – otherwise wouldn’t the boiler have already been damaged? There’s no such thing; boiler water, especially that used in steam boilers, needs to have its hardness removed and it needs to be deoxygenated. Low calcium levels have no corrosive effect on the circulating water itself.
Controlling the hardness of circulating water from being too low is necessary so that scale can form a protective layer on the metal surface, preventing contact between the metal and water and thus avoiding corrosion. It is recommended to take a look at the document on Baidu Wenku titled “Mechanisms of Scaling and Corrosion in Circulating Water and Their Control”. Baidu Wenku: http://wenku.baidu.com/link?url=3puiVW3fbh5g3tpZ1SEocdjRnUlOg7Ds_v-QlddkYu_p6V2_COOc7F0dXmIWyhTx1jwumszdQxCPmPe3dzbOv9jIgII5_7kR6CmDHSOdqKO###
A low calcium ion concentration means that the water you’re using for replenishment isn’t fresh water; it might be desalinated water. I don’t think there’s any problem with that. I believe that in a circulating water system, the pH level shouldn’t be acidic, so a low calcium level is actually a good thing. We use circulating water for desulfurization processes – this allows for a longer circulation cycle, and it’s also beneficial for the towers! ! :victory::victory: