Contamination and cleaning of ultrafiltration membranes-Yuanlai Water Treatment

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Contamination and cleaning of ultrafiltration membranes

Released Date: May 11,2019 Article Source: Yuanlai Water Treatment

The contamination and cleaning of ultrafiltration membranes: As the contaminants retained by the ultrafiltration membrane continuously accumulate on the inner surface and in the membrane pores, the water flux and separation capacity of the ultrafiltration membrane gradually decline. Backwashing can partially restore the water flux of the membrane, but it cannot achieve a 100% recovery effect. Therefore, when the water flux of the ultrafiltration membrane drops by more than 30%, cleaning should be carried out Timely clean the contaminants adhering to the walls and pores of the ultrafiltration membrane to prevent irreversible clogging of the ultrafiltration membrane. The main cleaning methods are as follows: 1. Prepare the pH value of RO water or ultrafiltration water to 2 with HY-410 cleaning agent, inject it into the inlet valve of the ultrafiltration membrane through a booster pump, and circulate it back from the discharge valve. Adjust the discharge valve to stabilize the pressure at 0.25Mpa. After 30 minutes of circulation cleaning, adjust the inlet valve, discharge valve and other valves

As the pollutants retained by the ultrafiltration membrane continuously accumulate on the inner surface of the membrane and in the membrane pores, the water flux and separation capacity of the ultrafiltration membrane gradually decline. Backwashing can partially restore the water flux of the membrane, but it cannot achieve this100%Therefore, when the water flux of the ultrafiltration membrane drops by more than the recovery effect30%When necessary, cleaning should be carried out to promptly remove contaminants adhering to the membrane walls and pores of the ultrafiltration membrane to prevent irreversible clogging of the ultrafiltration membrane.

The main methods of cleaning are as follows:

1Use scale inhibitor cleaning agent to cleanROWater or ultrafiltration waterpHThe value is configured to2The water is injected from the inlet valve of the ultrafiltration membrane by the booster pump and circulates back from the discharge valve. The discharge valve is adjusted to stabilize the pressure0.25MpaCirculation cleaning30After a few minutes, close all the inlet valve, discharge valve and regulating valve, and seal and immerse the ultrafiltration membrane2Rinse thoroughly with ultrafiltration water after an hour.

2"Use"Scale inhibitorThe cleaning agent willROWater or ultrafiltration waterpHThe value is configured to12The water is injected from the inlet valve of the ultrafiltration membrane by the booster pump and circulates back from the discharge valve. The discharge valve is adjusted to stabilize the pressure0.25MpaCirculation cleaning30After a few minutes, close all the inlet valve, discharge valve and regulating valve, and seal and immerse the ultrafiltration membrane2Rinse thoroughly with ultrafiltration water after an hour.

3Join0.5%theHY-240The ultrafiltration membrane is cleaned with the agent and then subjected to circulating chemical washing or soaking.

4The operation of the valve is shown in the following figure

The preservation of ultrafiltration membranes: When not in use, ultrafiltration membranes are generally immersed in a protective solution for sealed storage to prevent the wet membrane from shrinking due to dehydration, reducing the size of membrane pores, damaging the membrane structure, and decreasing water flux.

I. Short-term storage: If the ultrafiltration membrane is not in use (less than.10The ultrafiltration membrane should be backwashed once every day, and the addition should be made to the backwash water15ppm(ml/L"HY-240After the treatment, close the inlet valve, discharge valve and regulating valve of the ultrafiltration membrane to maintain its sealing and function.

Ii. Long-term Storage: If the ultrafiltration membrane is not used for a long time (exceeding)10First, backwash the ultrafiltration membrane once, and then inject it into the ultrafiltration membraneHY-310Seal and store after protective solution (it is best.ROWater.

Keywords: Water Softening Equipment Automatic Water Softener Reverse Osmosis Equipment Manufacturer of Water Treatment Equipment

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