In the process of cleaning Dow membrane element, many operation mistakes will lead to membrane element damage. In order to avoid this mistake and maintain the safety of equipment and Dow reverse osmosis membrane elements, the cleaning steps should be strictly followed. When washing, the pollutants and impurities deposited on the surface of Dow reverse osmosis membrane should be washed away by low pressure and large flow. The misunderstanding of off-line cleaning of Dow reverse osmosis membrane mainly includes the following aspects:
1, Dow reverse osmosis membrane module cannot be fully recovered after cleaning.
In fact, after proper off-line cleaning, the reverse osmosis membrane can basically be restored to the new membrane state, and the water yield can also be naturally restored to the initial state, which can be detected by professional equipment or verified by reinstalling membrane elements.
2. After cleaning, the desalination rate of membrane elements will definitely recover or decrease.
At present, there are two main opinions about the desalination rate of membrane elements, but the actual situation depends on the pollution degree of membrane elements. If the pollutants do not destroy the desalting layer, the recovery effect is better. If there is damage, the recovery degree is small, but at least it can be higher than the desalination rate before cleaning.