VONTEX brand X-225 UF membrane Introduce 

The operation mode of Vontex series ultrafiltration technology adopts the full flow filtration. Therefore, it saves the operation energy greatly, and the typical filtration pressure difference is 0.3-0.8bar (5-12PSI). The solid  particles deposited on the membrane surface are removed by regular backwashing, without any addition of any  chemical cleaning agent. The solid dirt is removed by regular backwashing, thus avoiding the deposition on the  membrane surface. Such operation mode is prior to the immersed membrane filtration. The immersed  membrane filtration adopts the external pressure filtration because of immersing the membrane in the water  tank, so it will lead to the accumulation of solid contaminants in the water tank. And once any membrane silk is  broken, it will lead to the leakage of contaminants into the effluent water. The dirt which is absorbed on the  membrane surface and can't be removed through backwashing shall be removed by online chemical enhanced  backwashing (CEB). At this time, the membrane components will not be removed but cleaned online. A small  amount of chemical cleaning agent shall be added in the process of chemical enhanced backwashing. After the  short-time immersion (generally 5-10 minutes), the chemical cleaning agent will be discharged, and the  ultrafiltration membrane is re-cleaned. Generally, it is not necessary to remove the Vontex ultrafiltration  membrane before cleaning, which avoids the possible cross contamination caused by the repeated use of  cleaning agent. In addition, the artificial monitoring is not required in the equipment operation process. ◆Process parameters Such membrane component is used for the full flow filtration. The typical process  parameters are as follows: 

• Operating pressure: 0.1～0.2MPa

• Operating pressure difference: 0.01～0.1MPa

• Backwashing pressure: <0.3MPa

• Filtered water flux: 60～135 L/m2.h

• Filtration cycle: 15-60 minutes (depend on the quality of raw water)

• Backwashing flux: 250～300 L/m2.h 

• Backwash time: 30-60 seconds (depending on the quality of raw water) 

• CEB spacing: 12h-48h (depend on the quality of raw water) 

• CEB dosing kinds and concentration: 

The hole diameter of Vontex ultrafiltration membrane is 10nm, and the distribution of hole diameter is very concentrated. These characteristics guarantee that the ultrafiltration membrane becomes the absolute barrier  of all suspended solids, including bacteria, colloform, etc. Regardless of the influent water conditions, the  high-quality water supply can be kept continuously. 

The effluent water indicators are as follows:

• Suspended solid<0.5mg/L

• Turbidity <0.1NTU 

• Bacteria removal rate >6log

• Virus removal rate >4log