Advantages of offline cleaning equipment for reverse osmosis equipment

Conditions for Offline Cleaning of Reverse Osmosis Equipment

1. Reverse osmosis membrane element pollution meets the "severe pollution" standard;
2. The reverse osmosis system cannot reach the rated standard through online cleaning;
3. Water treatment systems that cannot be cleaned online due to water shortages or lack of online cleaning equipment:
4. The reverse osmosis pollution type is relatively complex, and online cleaning is prone to cross-contamination;
5. Not every membrane element in a membrane system needs offline cleaning. Single reverse osmosis membranes can be screened based on evaluation tests.

Advantages of Offline Cleaning of Reverse Osmosis Equipment

In current reverse osmosis membrane element cleaning, offline cleaning, as an effective means of thoroughly eliminating reverse osmosis membrane element pollution, has been accepted by a large number of reverse osmosis users and is becoming an increasingly important cleaning method for reverse osmosis membrane elements. Compared with online cleaning, offline cleaning has the following advantages.
1. During online cleaning, the equipment stops producing water and is in a cleaning cycle until the cleaning is completed before returning to normal operation: During offline cleaning, replacement membranes ensure continuous normal water production in the equipment, preventing interruptions due to unexpected situations or prolonged cleaning times. The performance of the replacement membrane should generally not be lower than that of the online membrane element, at least within the acceptable range of user production.
2. During online cleaning, several membrane elements in the entire membrane tube are cleaned in series. Pollutants must pass through each membrane element before leaving the system, making cleaning incomplete; during offline cleaning, single membrane elements are cleaned individually, and pollutants are directly removed from the membrane element, preventing serial contamination.
3. During online cleaning, only the operating data can provide a general understanding of the cleaning system status: During offline cleaning, the status of the entire membrane tube and each membrane element can be visually and specifically analyzed to improve system operation.
4. During online cleaning, the scheme and cleaning operation can only be formulated based on the overall system operating conditions. Each cleaning can only use one chemical agent to clean all membrane elements in the system, and the cleaning time, temperature, and conditions are the same; during offline cleaning, different cleaning agents can be selected based on the location, pollution condition, pollution degree, and performance degradation of the membrane element in the system. Different cleaning schemes can be formulated, and cleaning measures, chemical agents, dosage, and cleaning sequence can be adjusted at any time to achieve the maximum degree of thorough restoration.
5. Online cleaning can only partially restore the overall system operating status; offline cleaning can not only restore the performance of each membrane element but also screen the membrane elements during testing and remove unusable elements.
6. During online cleaning, the cleaning solution fills the entire system, causing pollutants detached from severely polluted membrane elements to recirculate to the system, posing a risk of secondary pollution to relatively clean membrane elements; offline cleaning can classify and clean membrane elements according to different pollution levels, ensuring thorough cleaning of each membrane element.
7. During online cleaning, to achieve the cleaning effect, the amount of chemicals used must usually be increased, or the cleaning time must be extended, using chemical action to dissolve the fouling, which will pose a certain threat to the safety of the membrane element, and has no effect on some insoluble mechanical impurities; offline cleaning achieves thorough cleaning through the combined action of physical and chemical methods. With the physical characteristics of special membrane washing equipment, more mechanical impurities can be peeled off from the membrane element, and with the assistance of chemical agents, the cleaning is very thorough and hardly damages the membrane.
8. During offline cleaning, a high-flow reverse flush can be performed on a single membrane element to maximize the removal of pollutants from the membrane body, which cannot be achieved during online cleaning due to equipment limitations.