Regarding the issue of abnormal total phosphorus in circulating water
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Abnormal total phosphorus in the circulatory system; the total phosphorus level decreased after adding scale inhibitors； If it is not added for a few days, the total phosphorus level will gradually increase, but the increase will not be significant. Recently, in the circulating water system of a petrochemical company, the total phosphorus level has been steadily maintained at 3-5 ppm on a daily basis. But since mid-last month, with no changes in the chemicals or water replenishment, the total phosphorus level has started to drop to around 2 ppm. At first, we suspected it was a problem with the manufacturer’s testing; we took samples and conducted our own tests, and the manufacturer’s products appeared to be fine. Later, it was suspected that there was a leak in the pipeline (hidden pipe) of the chemical addition equipment, so the chemicals were allowed to be added directly into the circulation tank. To meet the standards, we asked the manufacturer to add 200 kg at once based on the amount of water stored (50 kg per day on a regular basis), in order to raise the total phosphorus level in the circulating water to 4 ppm. However, after 4 hours of addition by the manufacturer, the test results showed that the level was still less than 1.2 ppm. It’s really the devil. You should know that for this batch of medication, we even set the maximum allowable level of total phosphorus at 0.5%; yet the amount of total phosphorus that can be added not only didn’t increase but actually decreased. What’s even more incredible is that a few days ago, we didn’t ask the manufacturer to add chemicals (the scale inhibitor had run out and the supplies hadn’t arrived yet), yet the total phosphorus level in the circulating water increased. The calcium ion concentration in the circulating water is 600 ppm (based on calcium carbonate), and the chemicals used in the circulating water are organophosphates, eliminating the possibility of calcium phosphate scale formation. Could it be an organic substance leak that causes inaccurate color development when measuring total phosphorus, leading to abnormal results for total phosphorus? May I ask, what are the influencing factors in the total phosphorus measurement process? Dear seniors, who has encountered such problems before
I have experienced one instance where the total phosphorus in the circulating water increased due to the addition of sodium hypochlorite. At that time, the residual chlorine level in the system remained low for some time; there was an excess of algae in the system. Therefore, the dosage of sodium hypochlorite was increased to raise the residual chlorine level to around 1.0 ppm. With no significant changes in other conditions, the total phosphorus level in the system rose from 8 ppm to 14 ppm within a single day. It’s related to the microorganisms and sludge at the bottom of the pool; after sodium hypochlorite is added, the sludge releases inorganic phosphorus.
Thank you; we are also asking the manufacturer to carry out sterilization. A colleague of mine also told me a couple of days ago that this might be due to bacteria growing, which absorb phosphates and convert them into inorganic phosphorus that gets deposited in the sludge. He has also encountered such situations: the more chemicals were used, the lower the total phosphorus level became, and eventually phosphates were found in the sludge. I hope we can find the problem this time!
System status: After two sterilization processes, the total phosphorus level has gradually returned to normal, rising from less than 3.0 to 4.16 pp as of yesterday. Moreover, during the period of system abnormalities, the total iron content in the circulating water remained very low, generally staying between 0.01–0.02 ppm; in some cases it was even too low, which is abnormal. After sterilization, it has recently risen to 0.2–0.3 ppm, returning roughly to the normal levels seen in previous years. Both total phosphorus and total iron are abnormally low – what could be the reason for this? Is it the leakage of organic matter that affects the test results, or is it the encapsulation of total phosphorus and total iron by organic matter, or perhaps does organic matter promote the growth of bacteria and algae, thereby causing these abnormalities? I hope everyone can give some suggestions or opinions!
Bacteria consume your phosphorus, then they stay in the sediment at the bottom of the system, on the tank walls, and in the packing material; after dying, they return the phosphorus to you.
Zhang took a pose:):victory:
Our company’s pharmacy has encountered the same issue. Brother, how did you solve it?
But here I have a closed-loop heating circulating water system.
Is this a problem that tends to occur in most circulating water systems after long-term operation? We also sometimes encounter very high levels of total phosphorus