What is the prevention method for reverse osmosis operation failure of small and medium-sized automa

What is the prevention method for reverse osmosis operation failure of small and medium-sized automatic industrial pure water equipment?

by:Ocpuritech     2021-06-25
What is the prevention method for reverse osmosis operation failure of small and medium-sized automatic industrial pure water equipment? Author: When it comes to small and medium automatic industrial water equipment, surely we are no stranger to small and medium automatic industrial water equipment industry has become an essential water equipment. In order to ensure the safety of daily drinking water, many industrial manufacturers have begun to use small and medium-sized automatic industrial pure water equipment, which can effectively solve the problem of unsanitary tap water and make a great contribution to our health. The reverse osmosis operation of small and medium-sized automatic industrial pure water equipment is affected by many factors. If the equipment can operate normally, it is necessary to understand what these factors are before they can be controlled. Then the small and medium-sized automatic industrial pure water will be affected. What are the factors of reverse osmosis operation of the equipment? 1. Desalination rate of membrane element: The desalination rate depends on the density of the ultra-thin desalination layer on the surface of the membrane element. The higher the density, the higher the desalination rate and the lower the water production. Under ideal conditions in the laboratory, the desalination rate of membrane elements can reach over 99.7%. The removal rate of different substances by reverse osmosis is mainly determined by the structure and molecular weight of the substance. The removal rate of high-valent ions and complex monovalent ions can exceed 99%; and the removal of monovalent ions such as sodium ions, potassium ions, and chloride ions. The removal rate is slightly lower, but it also exceeds 98%; the removal rate of organic substances with a molecular weight greater than 100 can also reach 98%, but the removal rate of organic substances with a molecular weight less than 100 is low. 2. Water production (water flux) of membrane elements Water production (water flux) refers to the amount of water permeating through the membrane per unit time, usually expressed in tons/hour or gallons/day. 3. Recovery rate of membrane elements: It is usually hoped that the recovery rate of the membrane system is maximized in order to obtain higher water production, but it is limited because the excessive recovery rate will cause salt and fouling in the membrane system. 4. The influence of the inlet water pressure on the reverse osmosis membrane: The inlet water pressure itself does not affect the salt permeation rate, but the increase in the inlet water pressure increases the net pressure that drives the reverse osmosis, which increases the water production and at the same time the salt The permeation rate is almost unchanged, and the increased water production dilutes the salt content of the membrane, which reduces the salt content in the unit product water and increases the desalination rate of the membrane element. However, when the inlet water pressure exceeds a certain value, the excessively high water production will increase the concentration polarization, which will cause the salt permeation to increase, offset the increased water production, and make the desalination rate stabilize at a certain value. increase. 5. The influence of the inlet water temperature on the reverse osmosis membrane: The conductivity of the reverse osmosis product water is very sensitive to the change of the inlet water temperature. As the water temperature increases, the water flux also increases linearly, and the inlet water temperature increases by 1 ℃, the production water flux will increase by 2.5-3.0%. The reason is that as the temperature increases, the viscosity of water molecules decreases and the diffusion performance increases. The increase in the temperature of the inlet water will also lead to an increase in the salt permeability and a decrease in the desalination rate. This is mainly because the diffusion rate of salt through the membrane will be accelerated by the increase in temperature. 6. The influence of the pH value of the feed water on the reverse osmosis membrane: The pH value of the feed water has almost no impact on the water production, but has a greater impact on the salt rejection rate. Because the dissolved carbon dioxide in water is greatly affected by the pH value, when the pH value is low, it exists in the form of gaseous carbon dioxide and easily penetrates the reverse osmosis membrane. Therefore, the lower the pH value, the lower the salt rejection rate; as the pH value increases, the gaseous carbon dioxide gradually It is converted into bicarbonate ions and carbonate ions, and the salt rejection rate gradually increases, and the salt rejection rate reaches the highest between pH 7.5 and 8.5. 7. The influence of influent salt concentration on reverse osmosis membrane: Osmotic pressure is a function of the salt or organic concentration in the water. The higher the salt content, the greater the osmotic pressure. In the case of constant inlet pressure, the greater the osmotic pressure, the net pressure of system operation (net pressure u003d inlet pressure-osmotic pressure) will decrease, and the water production will decrease. At the same time, the salt permeability is proportional to the salt concentration difference on both sides of the membrane. The higher the salt content of the influent, the greater the concentration difference, and the salt permeability increases, which leads to a decrease in the salt rejection rate. This is the end of the introduction about the factors of the reverse osmosis operation of small and medium-sized automatic industrial pure water equipment. I hope it will be helpful to everyone. I also want to know more about the relevant content of small and medium-sized automatic industrial pure water equipment. You can continue Follow our website.
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