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Disadvantages
Household reverse osmosis units use a lot of water because they have low back pressure. As a result, they recover only 5 to 15% of the water entering the system. The remainder is discharged as waste water. Because waste water carries with it the rejected contaminants, methods to recover this water are not practical for household systems. Waste water is typically connected to the house drains and will add to the load on the household septic system. A reverse osmosis unit delivering five gallons of treated water per day may discharge between 20 and 90 gallons of waste water per day.[19]
Large-scale industrial/municipal systems recover typically 75% to 80% of the feed water, or as high as 90%, because they can generate the high pressure needed for higher recovery reverse osmosis filtration. On the other hand, as recovery of waste water increases in commercial operations, effective contaminant removal rates tend to become reduced, as evidenced by product water total dissolved solids levels.
Due to its fine membrane construction, reverse osmosis not only removes harmful contaminants present in the water, but it also may strip many of the good, healthy minerals from the water. A number of peer-reviewed studies have looked at the long-term health effects of drinking demineralized water.[20]更多精彩文章及讨论，请光临枫下论坛 rolia.net
Disadvantages
Household reverse osmosis units use a lot of water because they have low back pressure. As a result, they recover only 5 to 15% of the water entering the system. The remainder is discharged as waste water. Because waste water carries with it the rejected contaminants, methods to recover this water are not practical for household systems. Waste water is typically connected to the house drains and will add to the load on the household septic system. A reverse osmosis unit delivering five gallons of treated water per day may discharge between 20 and 90 gallons of waste water per day.[19]
Large-scale industrial/municipal systems recover typically 75% to 80% of the feed water, or as high as 90%, because they can generate the high pressure needed for higher recovery reverse osmosis filtration. On the other hand, as recovery of waste water increases in commercial operations, effective contaminant removal rates tend to become reduced, as evidenced by product water total dissolved solids levels.
Due to its fine membrane construction, reverse osmosis not only removes harmful contaminants present in the water, but it also may strip many of the good, healthy minerals from the water. A number of peer-reviewed studies have looked at the long-term health effects of drinking demineralized water.[20]更多精彩文章及讨论，请光临枫下论坛 rolia.net