Reverse osmosis water treatment commonly used a semipermeable membrane material has fiber membrane (cellulosic), aromatic poly Yun amine (aromatic polyamides), polyimide or polyfuranes etc., as to the structure shape of spiral (spiral wound), hollow fiber type (hollow fiber) and tubular type (tubular), etc.
As for the advantages of cellulose film in these materials, it is highly resistant to chlorine, but in alkaline conditions (pH is greater than 8.0) or bacteria exist, the service life will be shortened.
The disadvantage of polyamide is the tolerance of chlorine and ammonia.
If there is no pretreatment before reverse osmosis, it is easy to have dirt accumulation on the permeable membrane, such as calcium, magnesium and iron plasma, resulting in the decrease of reverse osmosis function.
Some membranes (such as polyamide) are easily damaged by chlorine and chlorine, so pretreatment of active carbon and softeners is required before reverse osmosis.
Reverse osmosis, although the price is higher, because generally the reverse osmosis membrane aperture about below l0A, it can eliminate bacteria, virus and pyrogen and even all kinds of soluble ion, etc., so in preparation for hemodialysis analysis interpretation of the best water for this step.
The debugging of reverse osmosis system is very important.
We can learn from the following aspects:
Preparation before operation