Introduction: Reverse osmosis system is used in the field of desalination, separation and concentration of various solutions, the production and manufacturing of the pharmaceutical and microbiological fields, and the field of domestic water. Many tiny chemicals and effluent quality can be intercepted. However, as the use time increases, it must be cleaned. 

1. Ro membrane element chemical cleaning specification.

When the following situations occur, physical cleaning has long been unable to repair the performance of ro membrane element, and chemical cleaning must be performed at this time.
1. Water production rate drops by 10-15% under standardized standards
2. The system pressure difference between seepage and concentrated water rises to 1.5 times the initial value.

3. Water production is reduced by 10-15%

2. Chemical cleaning frequency of ro membrane element.

When reverse osmosis element membrane is slightly contaminated, reverse osmosis element membrane should be cleaned immediately. Moderate and severe pollution will endanger the actual cleaning effect due to factors such as the difficulty of organic chemicals to penetrate into the pollution layer and the difficulty of pollutants to break through the membrane. If the performance of ro membrane element is reduced to 30-50% of the standard value, it will be difficult to clean and repair the original performance of the membrane system.
The cleaning cycle time of the diaphragm depends on the specific pollution situation on site. All normal cleaning cycle times are once every 3-12 months. If cleaning more than once a month, the pretreatment must be improved, such as increasing project investment or redesigning the membrane system; if the cycle time for cleaning ro membrane element is 1-3 months, attention should be paid to adjusting and improving the main components of the current system. Operating parameters. Even if the system has not been polluted for a long time, in order to better ensure the normal operation of the system, a chemical cleaning can generally be considered every 6 months.

In order to better obtain a stable water body, proper cleaning work or need to be carried out, the content introduced in this issue is hoped to be helpful to everyone.