How to improve the quality of softened water in ion exchange experiments

How deionized water equipment works.

The deionized water equipment adopts the ion exchange method, which can remove the ionic cations and anions in the water, and the sodium chloride (NaCl) represents the inorganic salts in the water, and the basic reaction of water desalination can be expressed by the following equations:

1. Cation exchange resin: R—H+Na+ R—Na+H+

2. Anion exchange resin: R—Oh+Cl- R—Cl+OH-

The total reaction formula of cation and anion exchange resin can be written as: Rh + RoH + NaCl - RNA + RCL + H2O It can be seen that NaCl in water has been replaced by H+ and OH- on the resin respectively, and the reaction product is only H2O, so the effect of removing salt in water is achieved.

The deionized water equipment adopts the two-stage RO+EDI modular design mode, which is used in conjunction with pre-treatment, and uses the principle of reverse osmosis to effectively remove various salts and impurities in the water; The system has the advantages of advanced technology, stable water quality, easy operation, low operating cost, green environmental protection and pollution-free, and convenient maintenance.

Sanda Water Treatment is a professional manufacturer of deionized water equipment and softened water equipment in Beijing, providing professional water treatment solutions.

The addition of an active agent can improve the softening of the water.

Add an activated carbon filter. For more information, please call 021-60945728 Shanghai Pinchuang Environmental Protection.

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How to prepare soft water by ion exchange?

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The low-valent iron ions and low-valent manganese ions in the water are oxidized by oxidation method into ** iron ions and ** manganese ions, and then removed by absorption and filtration to achieve the goal of reducing the iron and manganese content in the water. In fact, it is a large iron can, which is filled with manganese sand, and when the water flows over, the iron ions are intercepted, and can be recycled through water reduction.

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Softened water resin regeneration of branches and operation steps.

Summary. In the process of producing deionized water using the ion exchange principle, the flow rate of the water and the effluent quality of the equipment have no effect.

What is the effect of the flow rate of water that is too fast or too slow on the water quality in the process of ion exchange to prepare ionized water?

In the process of producing deionized water using the ion exchange principle, the flow rate of the water and the effluent quality of the equipment have no effect.

Controlling the flow of water is to ensure that the water and the resin can have the contact time to complete the exchange, otherwise the flow is too fast, and there may be a loss of water molecules, and the exchange effect cannot be achieved, and the flow rate of 5 times the volume of resin per hour is generally more appropriate.

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Extension: Ion exchange is the effect of the exchange of ions in the solution with the ions on a certain skin ion exchanger, and it is a unit operation that belongs to the mass transfer separation process by exchanging the ions in the solid ion exchanger with the ions in the dilute solution to achieve the purpose of extracting or removing some ions in the solution.

Hello, I am glad to be able to answer your question and find out that the reason for the increase in the pH value of soft water after treatment with sodium ion exchanger is: the pure sodium ions in the water are replaced with chloride ions, the hardness of the water is reduced, and the harmful substances in the water are removed. The details are as follows:

A sodium ion exchanger is a commonly used water treatment technology that can change the properties of water by replacing ions in water, such as sodium ions, with other ions, such as chloride ions. With the use of sodium ion exchangers, the sodium ions in the water are replaced with chloride ions, which are themselves a strong alkaline substance that can raise the pH value of the water. In addition, due to the use of sodium ion exchangers, the hardness in the water will also be reduced in the cavity, which will also increase the pH value of the water.

In addition, the sodium ion exchanger can also remove harmful substances from the water, thereby improving the quality of the water and can improve the pH value of the water.

Summary. Hello dear, happy to answer your <>

The reason for the increase in the pH value of soft water after treatment with sodium ion exchanger is that the sodium ion exchanger can exchange soluble calcium and magnesium ions in the water with sodium ions in the water, thereby reducing the hardness in the water. In this process, since the sodium ions are less acidic, the exchanged soft water will also be less acidic, resulting in an increase in pH. In addition, there are relatively few bicarbonate ions in the soft water after sodium ion exchange, which further reduces the acidity of the water and causes an increase in pH value.

As a result, the pH of the soft water treated with a sodium ion exchanger increases.

The reason for the increase in pH of soft water treated with a sodium ion exchanger.

Hello dear, happy to answer your <>

The reason for the increase in the pH value of soft water after treatment by sodium ion exchanger is that the sodium ion exchanger can exchange soluble calcium and magnesium ions in water with sodium ions in water, thereby reducing the hardness in water. In this process, since the sodium ions are less acidic, the exchanged soft water will also be less acidic, resulting in an increase in pH. In addition, there are relatively few bicarbonate ions in the soft water after the exchange of sodium from the fiber pin, which further reduces the acidity of the water and causes the pH value to increase.

As a result, the pH of the soft water treated with a sodium ion exchanger increases.

If the raw water contains a lot of carbonic acidity, the sodium ion exchanger can remove the hardness ions and some carbonate ions, thereby reducing the carbonic acidity in the water, which in turn increases the pH value of the water. 2.Removal of organic acids:

The sodium ion exchanger can remove some organic acids in the water, such as tartaric acid, citric acid, etc., which can lower the pH of the water. Therefore, when these organic acids are removed, the pH of the soft water rises. It is important to note that the increase in pH of the water treated by the sodium ion exchanger is not an absolute result and may be affected by some other factors, including the characteristics of the raw water, the nature of the exchanger, the operating conditions of the exchanger, etc.

Therefore, the actual situation of pre-regret needs to be analyzed in detail. <>

5*10^-5mol/l

2hr+ca2+=car2+2h+

2hr+mg2+=mgr2+2h+

It can be seen that the number of H+ generated is twice the number of Ca2+ and Mg2+, so the concentration of H+ is twice that of Ca2+ and Mg2+.

The amount of change in H+ concentration is 10-4-10-7 mol l, 10-7 is too small to be negligible. Divide by 2 to get the Ca2+, Mg2+ concentration, which is 10 -4 2 = 5 * 10 -5mol L

pH value = 4 This water is acidic, but the index of pH value cannot replace the total hardness index content in the water, that is, the pH measured in different water samples is 4, but the total hardness content in the measured water is definitely different... Brilliant water quality.

At present, sodium exchange resin is used in softened water, and after a large and small replacement process, the exchange capacity of sodium resin is greatly improved (one liter of resin can exchange up to kilograms of Ca ions), and after the resin is saturated, it only needs to be regenerated with salt, and the degree of pollution and water saving greatly exceeds that of hydrogen resin.

The hydrogen resin you mentioned is generally used in places with high water alkalinity and is used as a process for reducing alkali, but if you simply reduce the hardness, it is not necessary.