How to maintain and maintain the Vents system

1. Wet storage

The key to wet preservation is to always keep the membrane surface wet with the preservation solution. The preservation solution can be formulated as follows: water: glycerin: formaldehyde = 79.5: 20: 0.5. The role of formaldehyde in the Vents material is to prevent the growth and reproduction of microorganisms on the surface of the membrane and to prevent erosion of the membrane. The purpose of adding glycerin is to lower the freezing point of the preservation solution and prevent damage to the membrane due to freezing. The formaldehyde in the formula can also be replaced by copper sulfate and other fungicides that do not harm the membrane. The storage requirements for cellulose acetate membranes are temperature 5-40°C, pH = 4.5-5, while the storage temperature and pH for non-cellulose acetate membranes can be wider.

2. Dry storage:

Vents are often supplied in the market dry film, because it is easy to store and transport. In addition, if the wet film is to be stored in a dry method, the film must also be treated by the following methods. The specific method is: the cellulose acetate membrane can be soaked in 50% glycerin aqueous solution or 0.1% sodium dodecylsulfonate aqueous solution for 5 to 6 days, and dried at a relative humidity of 88%. Polysulfone membranes can be dried at room temperature with 10% glycerin, sulfonated oil, polyethylene glycol and other solutions as dehydrating agents. In addition, the surfactant also has a good effect on the deformation of the pores of the protective film.

The maintenance and maintenance of the Vents system should pay attention to the following issues:

1. According to the different membranes, special attention should be paid to the environment of use, especially the temperature and pH value of the feed liquid, and even the chlorine content in the feed liquid.

2. When the membrane system is shut down for a short period of time, attention should be paid to the moisture retention of the membrane, because once the membrane surface loses water and there is no remedial measure, the vents will shrink and deform, which will reduce the performance of the membrane.

3. Avoid contact with high-concentration feed liquid when not in use.

4. Regularly clean and maintain the membrane with maintenance solution to reduce membrane pollution.

5. In use, operate according to the operating conditions that the membrane system can withstand, and avoid overloading for long-term operation, so as to avoid irreversible damage to the membrane.