The reverse osmosis system is an important component of the reverse osmosis purified water equipment, but there is also a hidden danger in the reverse osmosis system, which is that solutes or other trapped substances are easily formed on the surface of the reverse osmosis membrane. Formed concentration polarization. In order to affect the effluent quality of water treatment reverse osmosis equipment, in addition to the process design of water treatment reverse osmosis equipment, improvement measures need to be taken during equipment operation.

1. Methods to increase traffic

Measures commonly used in the chemical industry to increase unrest can be taken. That is to say, attempting to increase the linear velocity of fluid passing through the membrane surface. In water treatment reverse osmosis devices, in order to shorten the adsorption time of solutes, the residence time of the fluid should be reduced and the flow rate of the fluid should be increased.

2. Filling method

For example, in order to reduce the thickness of the membrane boundary layer and increase the permeability of the membrane, a 100um sphere is added to the treated liquid to flow through the reverse osmosis system. Granular materials can be made of glass or methyl methacrylate. In addition, for reverse osmosis purified water equipment, micro sponge balls can be added to the feed liquid. However, for plate frames and spiral wound membrane components, in other words, the method of adding fillers is not suitable, mainly due to the risk of blockages in the flow path.

3. Pulse method

A pulse generator has been added to the process of water treatment reverse osmosis equipment. The pulse amplitude and frequency are different. In general, the larger the amplitude or frequency, the greater the flow passing through. Agitators are widely used in various experimental equipment. The mass transfer coefficient is linearly related to the stirring speed.

4. Install the turbulence booster

Turbulence promoters are obstacles that can enhance flow patterns. For example, in the case of tubular parts, spiral baffles are installed inside. The plate or roller module can be lined with a mesh to drive turbulence. This turbulence promoter has a good effect.

5. Add dispersants and scale inhibitors

In reverse osmosis purified water equipment, in order to prevent reverse osmosis membrane fouling, sulfuric acid or hydrochloric acid can be added to adjust the pH value. However, the corrosion and leakage of the acid system have caused trouble for operators. Therefore, in order to maintain the normal operation of the water treatment system, it is usually necessary to add dispersed scale inhibitors.

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