Does Dow have a thermal sterilization reverse osmosis membrane?

Dow FILMTEC HSRO thermal disinfection reverse osmosis membrane element has good water quality and can withstand hot water disinfection. The HSRO module produced by the first automatic production line has the highest effective membrane area in the membrane industry. This high membrane area allows the system to be designed with lower operating flux, or to use fewer membrane modules to maintain the same flux, so as to save the system cost. The element adopts a fully bonded structure without shell, which eliminates the dead zone between the standard membrane element and the inner wall of the pressure vessel, and is suitable for applications with special sanitary requirements. And all the ingredients meet FDA standards.

Matters needing attention in hot disinfection of reverse osmosis membrane with Dow HSRO;

1. Before the first use, hot water should be used to thermally stabilize the Dow HSRO thermal sterilization coil element. Suitable thermal stabilization steps are as follows:

1. Under the condition of low pressure and low flow, rinse with purified water of appropriate quality.

2. Circulate hot water at a very low pressure, the water temperature is less than or equal to 45oC, the maximum pressure is 45psi(3bar), and the pressure difference between the two sides of the membrane must be less than 25psi( 1.7bar).

3. Inject hot water into the system until the temperature rises to 80 degrees Celsius.

4. When using warm water or hot water with a water temperature of 45℃ or higher, the pressure difference between the two sides of the membrane must be less than 25psi (1.7bar).

5. Keep the temperature for 60~90 minutes.

6. Let the system reduce the temperature to below 45 degrees Celsius.

7. Rinse with purified water with proper quality at very low pressure, with the maximum pressure of 45psi(3bar) and the pressure difference between the two sides of the membrane less than 25psi (1.7bar).

Secondly, in order to prevent potential membrane damage during startup, shutdown, cleaning or other processes, it is necessary to avoid any sudden pressure or cross-flow changes of coil elements. During the startup process, we suggest gradually changing from static state to running state through the following process:

1. Feed water pressure should be gradually increased within the time range of 30~60 seconds.

2. The design cross-flow velocity should be gradually reached within 15~20 seconds.

3. The product water should be discharged within the first hour.

Other considerations:

1. Once a part is wet, it should always be wet.

2. If the user does not strictly abide by the operating restrictions and guidelines set in this specification, the limited warranty will be invalid.

3. When the system is shut down for a long time, in order to prevent the growth of microorganisms, it is recommended to immerse the membrane element in a protective solution.