What are the solutions for excessive pH levels in circulating water?
Thread Content
Are there any solutions to the problem of excessive pH levels in circulating water? This post was last edited by dsj2008 on 2008-5-18 at 20:11.]
Changes in pH value have a direct impact on corrosion and scaling, especially for water-stabilizing formulations with low pH values, where pH is an extremely sensitive parameter. The control of the pH value is mainly achieved by adding acid to keep the pH value of the circulating water within the specified range. For reference, the following calculations are provided: The initial amount of acid added to the system, G′, and the regular amount of acid added, G, can be calculated using the following formulas: G′ = V × (M – M′) × 98 / (100 × a × 1000) (kg/h); G = BT × (M – M′) × 98 / (100 × a × 1000) (kg/h). In these formulas, V represents the volume of water retained, in m3; BT represents the total amount of wastewater discharged; M represents the total alkalinity at a certain pH level after concentration, expressed in mg/L based on CaCO3 ； M′ —— Total alkalinity of the concentrated water adjusted to the desired pH value (expressed as CaCO3), mg/L ； 98——Molecular weight of sulfuric acid ； a — Purity of commercial sulfuric acid, %. Both M and M′ are independent of the pH and alkalinity of the make-up water, and can be determined through on-site measurements. To prevent accidents caused by excessive acid addition, a buffer tank should be installed between the acid storage tank and the cooling tower water tank. This buffer tank can hold only enough acid for one day’s use; acid is added to the system through this tank, so that even if the control system malfunctions and too much acid is added, the amount will not exceed what can be used in one day, thereby reducing the risk of harm.
Adjust by adding acid or base; there is no other way
Investigate the reasons for the changes and address them properly.
Is acid or base added to the circulating pool?
Find out the reason and adjust by adding acid or base!
Add acid or alkali and pour it into the circulation tank.
For slightly alkaline conditions, acid is added; sulfuric acid is generally used for this purpose. In slightly acidic conditions, a different substance is used: NaOH is added when the pH is below 3, sodium carbonate is used when the pH is between 3 and 5.5, and in cases where the pH is above 5.5, the pH is allowed to rise naturally
Our pH value is also 10; we adjust it using acids and bases
Generally, the pH of circulating water is on the high side; adding an appropriate amount of sulfuric acid to neutralize it is sufficient, with no adverse effects
In our factory, the pH of the circulating water must be kept between 7.5 and 9.0, while the pH of the make-up water should be maintained between 7.0 and 8.0!
You can ask a professional water treatment company to analyze the water quality and determine what chemicals need to be added to adjust it
:L We’ve invited them, but we still can’t solve this problem.
The key is to consider the condition of the raw water; analyze its quality and then find a suitable formula, which should solve the problem!
Excessive bacteria levels can also cause changes in the pH value of the circulating water, as well as medium leakage! Analyze the quality of the circulating water, identify the causes, and take appropriate measures
Don’t faint – he’s an expert in recirculating water treatment! ! ! !
There are many influencing factors; apart from the quality of the raw water, the process itself, as well as the structure of the cooling tower, its orientation, and the environment surrounding the tower basin, all play a role in determining these factors. For example, in the steel industry, petrochemical industry, and electronics industry, the operating characteristics of circulating cooling water systems differ. To reduce the consumption of acid and alkali chemicals, it is necessary to take into account the specific conditions of your plant, and develop appropriate chemical formulations and operation plans based on the quality of the raw water and the characteristics of the processing process. One can rely on the expertise of professional water treatment manufacturers. In my opinion, when there is an appropriate chemical formula available, it is best to avoid adjusting the pH by increasing the acidity or alkalinity, as this ensures safety for both personnel and equipment. The system of the friend on the 8th floor can continue to operate by adding NaOH when the pH is below 3; this situation should not be considered normal operation, right? This post was last edited by hoverr on 2008-1-16 17:11]
What was said about the second floor doesn’t seem quite right; the pH level is either too high or too low. Adding more acid will only make things worse, won’t it?
Check the quality of the raw water. What do you mainly produce? Could it be a medium leakage? To resolve this issue now, the fastest method is to add acid first. Analyze the quality of the circulating water to identify the cause and take appropriate action