The application of reverse osmosis equipment in the water treatment industry can be said to be very extensive nowadays. Through such equipment, the system can produce stable water and meet certain standard requirements. However, during use, membrane fouling may also be encountered, which is a concern for many users.

In fact, when using reverse osmosis membrane products, the occurrence of pollution is not scary at all. As long as the right solution is chosen, its working performance can be restored and the expected water production index can be achieved. It is necessary for us to understand what substances cause membrane fouling before addressing the issue of reverse osmosis pollution.

When understanding the pollutants, it is also possible to choose a matching cleaning plan in order to achieve better results. Under long-term operation, a lot of dust will accumulate on the surface of the reverse osmosis membrane, and it needs to be cleaned in a timely manner to remove it completely. Below, the editor will share with you the reasons and solutions for membrane fouling in reverse osmosis equipment.

Reasons for reverse osmosis membrane fouling:

1. Membrane fouling is caused by frequent changes in water quality. Due to the increased pre-treatment load, impurities such as inorganic matter, organic matter, microorganisms, particles, colloids, etc. in the water were added, which increased the probability of membrane fouling.

2. Delayed cleaning and incorrect cleaning methods result in membrane fouling

3. Improper dosing of chemicals

4. Membrane surface wear: The membrane components are blocked by foreign objects or the membrane surface is worn (such as sand particles).

Solution measures for reverse osmosis membrane fouling:

1. Improve pre-processing

For each membrane device, it is expected to play its maximum role and aim to have the highest desalination rate, maximum water penetration, and the longest possible effect. To achieve the above three points, it is necessary to pre treat the water quality of the supplied water, so that the raw water entering the membrane device can be pre treated.

Reasonable pretreatment is crucial for the long-term safe operation of reverse osmosis devices. By meeting the pre-treatment requirements for reverse osmosis influent water quality, stable effluent flow can be ensured; The desalination rate remains at a certain value for a long time; The water recovery rate of the product can remain unchanged; The lowest operating cost; The service life of the membrane is longer.

2. Clean the membrane

After various pre-treatment measures, long-term use of the membrane surface may also cause sedimentation and scaling, leading to clogging of the membrane pores and a decrease in the amount of water produced. Therefore, it is necessary to regularly clean the pollutant film.

However, the reverse osmosis membrane system cannot be cleaned until the pollution is very severe, which increases the difficulty of cleaning and also increases the cleaning steps, prolonging the cleaning time. To grasp the cleaning timing correctly and promptly remove dirt.

3. Proper maintenance of the membrane

Maintain a new reverse osmosis membrane, where the new reverse osmosis membrane elements are typically immersed in 1< Garbage; Garbage 3 and 18< Garbage; In an aqueous solution and stored in a sealed plastic bag. If the plastic bag is not damaged and stored for about 1 year, it will not affect its lifespan and performance.

When the plastic bag is opened, it should be used as soon as possible to avoid negative effects on the components due to the oxidation of NaHSO3 in the air. Therefore, the membrane should be opened as much as possible before use. In the non production stage, maintenance of the reverse osmosis system is a more important issue.

4. Avoid membrane operation under high pressure

When the system starts and stops, there is residual gas that causes the system to operate under high pressure. The pressure gauges before and after the filter in the system are used to monitor the pressure drop of the filtering element, while the primary and final pressure gauges are used to monitor the pressure drop of the reverse osmosis membrane components. Adjust the inlet valve and thick water valve to ensure operating pressure and recovery.

5. Pay attention to the operation during shutdown

(1) When the machine is turned off, the rapid depressurization is not thoroughly flushed. Due to the higher concentration of inorganic salts on the concentrated water side of the membrane compared to the raw water, it is easy to form scale and contaminate the membrane. When preparing to close, please lower to 3 bar and rinse with pre treated water for 14/16 minutes.

(2) When preparing to close, adding chemical reagents can cause drugs to stay in the membrane and membrane shell, leading to membrane fouling and affecting the service life of the membrane. The addition should be stopped.

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