Inquiries regarding recirculating water monitoring indicators
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Dear colleagues, in chemical enterprises, generally more than one circulating water system is constructed; there may be several such systems serving the entire enterprise. I would like to ask everyone the following questions: 1. What indicators are generally used to monitor and determine the concentration factor of circulating water? 2. In the treatment process of circulating water, based on which indicators is the dosage and timing of adding scale inhibitors determined? 3. In the treatment process of circulating water, based on which indicators is the dosage and timing of adding corrosion inhibitors determined? 4. Based on what indicators is the operation of concentrating circulating water carried out?
What are the control indicators for recirculating water, and what are their respective functions? http://bbs.hcbbs.com/thread-209808-1-1.html (Source: Haichuan Network) Second floor
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The concentration factor is generally calculated based on the chloride (or potassium) content in water.
Scale inhibitors: changes in conductivity and hardness
Requirements for the concentration or properties of components used to monitor the degree of concentration: they should increase proportionally only with an increase in the degree of concentration, without being affected by other operating conditions (such as heating, aeration, addition of water treatment chemicals, deposition, or scaling, etc.)； The commonly selected component concentrations and properties include: chloride ion concentration, silica concentration, potassium ion concentration, calcium ion concentration, salt content, and electrical conductivity
Regarding the first question, what I would like to know is that in the process of monitoring the quality of recirculated water, it is reliable to use components that are inherently present in the raw water and unaffected by changes in water quality for monitoring and calculating the concentration ratio. Potassium ions serve as an indicator; chloride ions, on the other hand, may be elevated due to the influence of chlorine-containing disinfectants. Therefore, using potassium ions as a tracer is relatively reliable. When active chlorine is not used as a disinfectant, using chloride ions as a tracer is also a good option; moreover, the detection method and cost are more appropriate.
The water quality varies by region, and its usage also differs.
Heterotrophic bacteria-----Increase, leading to higher turbidity and slime formation； Total alkalinity-----increases; the system is prone to scaling ； pH value-------Increases; the system is prone to scaling ； Conductivity ----- increases; alkalinity rises, leading to easier scaling ； Chloride ions ---- decrease; replenish bactericides ； Orthophosphate ------ increases; the system is prone to scaling ； Calcium and magnesium ions----As their concentration increases, the system is prone to scaling ； Total iron---Increased concentration leads to intensified system corrosion.
Conductivity, chloride ions. The circulating water system has supporting equipment
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