High conductivity of reverse osmosis permeate water, how to reduce conductivity
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Time of issue:2020-02-28
【 Summary Description 】Conductivity reflects the water purification level after the reverse osmosis membrane, while the desalination rate of the reverse osmosis membrane is relatively fixed, so it is also directly affected by changes in the source water and fluctuates. In addition, as the use time increases, the conductivity may also increase.
Conductivity reflects the purification level of the new water after the reverse osmosis membrane, while the desalination rate of the reverse osmosis membrane is relatively fixed, so it is also directly affected by the changes in the source water and fluctuates. In addition, as the usage time increases, the conductivity may also increase.
During operation, pay attention to its changes at any time. Under the condition that the source water is relatively stable, if the new water does not suddenly increase or decrease sharply, it is considered normal.
1. Scaling pollution: Excessive recovery rate, deterioration of water quality, poor quality of antiscalant, unreliable addition of antiscalant, etc.
2. Connector leakage: O-ring leakage, connector leakage
3. Temperature rise: Increased temperature increases salt permeability
4. Increase in feed water conductivity: Increase in feed water conductivity directly leads to increase in product water conductivity, conductivity meter error, etc.
5. Increase in recovery rate: Operational errors, instrument errors, and poor sealing of brine seals, etc.
6. Reduction in operating pressure: Lower operating pressure can cause conductivity to increase, such as temperature increase, which does not require higher operating pressure
7. Reduced membrane element performance: Membrane element scratches, membrane oxidation, chemical cleaning damage, etc.
8. Organic matter pollution: Bacterial pollution, colloid pollution, insoluble NOM pollution, organic matter pollution, etc.
9. Abnormal PH value: Too high or too low PH value will seriously affect the desalination rate of the membrane element
10. Excessive pressure: Overpressure operation increases salt permeability
11. Extended operating life: As the operating life of the membrane element increases, the salt permeability increases
12. Raw water contains a large amount of gas: Similar to free carbon dioxide gas, etc.
Therefore, it is difficult to determine the specific reason for the increase in conductivity without a control group. Of course, if the specific reason is known, the product water conductivity can also be reduced. For example, the following measures can be taken:
1. Reduce the recovery rate: Appropriately reducing the recovery rate can significantly improve the quality of product water
2. Appropriately increase the operating pressure: Appropriately increasing the operating pressure can get closer to the optimal operating state
3. Appropriately reduce the water temperature: For systems with heat exchangers, the reverse osmosis feed water temperature can be appropriately reduced
4. Thorough chemical cleaning: Chemical cleaning can remove pollutants from the reverse osmosis membrane elements
5. Adjust the PH value: For primary reverse osmosis, it may be aimed at adding acid, while for secondary reverse osmosis, it is aimed at adding alkali
6. Remove free gas: Free gas can carry salt through, and effectively removing free gas may also be a solution
7. Part of the product water reflux: For devices with large production capacity, the product water can be refluxed to the raw water to reduce the salt content of the feed water
8. Replace membrane elements: Damaged, aged, or chemically cleaned systems are a reliable method
9. Equipment maintenance: Find and solve the fault points of concentrate and fresh water leakage
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Shijiazhuang Tianwang Environmental Protection Technology Co., Ltd.
Shijiazhuang Tianwang Environmental Protection Technology Co., Ltd. is a high-tech enterprise specializing in the research and development, manufacturing and sales of water treatment equipment.
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