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How to judge whether the reverse osmosis membrane needs cleaning and replacement
Source: | Author:demihwater | Publish time: 2019-03-29 | 124 Views | Share:
Dow reverse osmosis membranes can normally be used for about 2 to 3 years. If you want to extend the service life, you can clean the reverse osmosis membrane components, usually divided into physical washing and chemical washing. When physical washing can not restore the performance of the reverse osmosis membrane, chemical cleaning should be carried out.
How to judge whether the reverse osmosis membrane needs cleaning and replacement

Dow reverse osmosis membranes can normally be used for about 2 to 3 years. If you want to extend the service life, you can clean the reverse osmosis membrane components, usually divided into physical washing and chemical washing. When physical washing can not restore the performance of the reverse osmosis membrane, chemical cleaning should be carried out.

1. Cleaning of reverse osmosis membrane

According to experience, if the reverse osmosis device is cleaned every three months or more. If it is cleaned once every 1-3 months, it is necessary to improve the operating conditions and improve the pretreatment effect.

1. Judging the cleaning situation:

(1) Standardized freshwater production decreased by more than 10%.

(2) Standardized salt permeability increased by more than 10%.

(3) In order to maintain normal freshwater flow, the pressure difference between feed water and concentrated water increased by more than 10% after temperature calibration.

(4) There are serious pollutants and scales in the internal devices.

(5) Before long-term shutdown of RO plant.

(6) Routine maintenance of RO devices.

Before deciding whether to clean the reverse osmosis system, the following other reasons should be considered comprehensively: operation pressure drop (pressure control device failure and abnormal high-pressure pump); water temperature drop (heater failure or seasonal change caused water temperature drop); salt content increase in water intake; abnormal pretreatment; membrane damage, series membrane element center Concentrated water seeps into fresh water due to misalignment of pipes and improper sealing of O-ring of pressure vessels.
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