What are the requirements of reverse osmosis membrane systems for feed water quality

Pure water equipment can be used in the chemical, pharmaceutical and food industries. There will be a full set of pretreatment devices in the whole system, mainly for the preliminary treatment of raw water to meet the feed water requirements of the reverse osmosis mainframe.

The reason why the reverse osmosis mainframe has high requirements for the feed water quality is mainly due to the structure of the reverse osmosis membrane element, material, desalination mechanism and other restrictions in various conditions.

Requirements for feed water for reverse osmosis mainframes.

① Temperature conditions usually between 1 and 45°C

② pH = 4 to 7

③ Residual chlorine content <0-1mg/L

④ Iron content (mg/L): Fe<0.05 for dissolved oxygen >5mg/L

⑤ Organic matter content (COD) <3mg/L

⑥ Turbidity (NTU) <1.0

⑦ Silt density index (SDI value) <5

⑧ Hardness in the range of 10-250mg/L

Only when the raw water has reached the above conditions can it enter the reverse osmosis host system, otherwise it will damage the reverse osmosis membrane and make the water quality not reach the standard of pure water, the conductivity will also be high and it will affect the service life of the equipment.