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Chloramines Removal Technology
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Chloramines Removal Technology
Technical explanation
problem lies in:
Some areas have recently increased the pH of urban tap water in accordance with 美國's newly proposed regulations on lead levels in water. However, when the pH value of the water exceeds 9 and the water contains chloramines, we observed that the repulsion of the polyamide thin film composite membrane (filter membrane) to the solute in the water decreases. It is generally believed that high pH in water causes chloramines to separate into ammonium ions and hypochlorite ions. Ammonium ions are difficult to remove by activated carbon treatment, so when ammonium ions interact with polyamide membranes (filters), their repelling properties deteriorate. Often this can be adjusted to reduce this repellency by lowering the pH of the water supply. Note: Most larger urban water systems now treat water with chloramines (vs. free chlorine). This can greatly reduce the performance and lifespan of the chlorine membrane.
Solution technology:
Chloramines must be completely removed from the water at pH above 9 to eliminate its potential damage to the membrane. This damage may be caused by the separation of chloramines into ammonia and chlorine. The method to remove chloramines can be completely removed by appropriately adjusting the activated carbon pretreatment system at a rate of 1.35 cubic feet per minute (equivalent to 10 minutes of empty bed contact time). NOTE: The damage effect is more pronounced when water stagnates on the membrane surface. The use of osmotic flushing is recommended to prevent any membrane damage.