What should I do if the concentration polarization of reverse osmosis occurs in small and medium-siz

What should I do if the concentration polarization of reverse osmosis occurs in small and medium-sized automatic ultrapure water treatment equipment?

by:Ocpuritech     2021-06-24
What should I do if the concentration polarization of reverse osmosis occurs in small and medium-sized automatic ultrapure water treatment equipment? Author: reverse osmosis system is essential for small and medium automatic ultrapure water treatment equipment is an important part, but there is also a reverse osmosis system risk is that the reverse osmosis membrane surface can easily be concentrated form solute rejection or other substances Poor polarization affects the effluent quality of small and medium-sized automatic ultrapure water treatment equipment. In addition to considering the process design of small and medium-sized automatic ultrapure water treatment equipment, improvement measures must be taken in the operation of the equipment. So what should I do if the concentration polarization of reverse osmosis occurs in small and medium-sized automatic ultrapure water treatment equipment? 1. Increasing flow rate method First of all, the measures commonly used in chemical industry to increase turbulence can be adopted. That is, try to increase the linear velocity of the fluid flowing through the membrane surface. Reduce the fluid residence time, increase the velocity of the fluid in the small and medium-sized automatic ultrapure water treatment equipment to reduce the adsorption time of the solute, and the solute is not easy to be adsorbed when the flow rate increases. 2. Filling method If you put 29~100um pellets into the liquid to be treated, let them flow through the reverse osmosis system to reduce the thickness of the membrane boundary layer and increase the permeation rate. The material of the pellets can be made of glass or methyl methacrylate. In addition, for tubular reverse osmosis systems, micro sponge balls can also be added to the feed liquid. However, for plate-and-frame and spiral-wound membrane modules, In other words, the method of adding filler is not suitable, mainly because of the danger of blocking the flow channel. 3. Pulse method A pulse generator is added to the process of small and medium-sized automatic ultrapure water treatment equipment. The pulse amplitude and frequency are different. Generally, the greater the amplitude or the higher the frequency, the greater the flow rate through. Agitators are widely used in all test devices, and experience has shown that the mass transfer coefficient has a linear relationship with the number of rotations of the agitator. 4. Installation of turbulence booster Turbulence booster refers to a variety of obstacles that can strengthen the flow pattern. For example, for tubular components, a spiral baffle is installed inside. The plate-type or roll-type membrane module can be lined with grids and the like to promote turbulence, and the effect of this turbulence promoter is very good. 5. Adding dispersion scale inhibitor In order to prevent the scale of reverse osmosis membrane in small and medium-sized automatic ultrapure water treatment equipment, sulfuric acid or hydrochloric acid is added to adjust the pH value. However, the corrosion and leakage of the acid system make the operator feel troublesome, so the dispersion The scale inhibitor maintains the normal operation of the water treatment system.
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