【National standards】
Power boiler feed water requirements
Installation |
Ion exchange |
Electrodialysis |
Reverse osmosis |
|
Cellulose acetate film roll |
Polyamide hollow fiber membrane element |
|||
Turbidity / degrees |
Counter-current regeneration<2 |
< 2 |
< 0.5 |
< 0.3 |
COD/mg . L - 1 |
< 2.3 |
< 3 |
< 1.5 |
< 1.5 |
Free Chlorine /mg . L - 1 |
< 0.1 |
< 0.1 |
0.2 ~ 1.0 |
0 |
Total Iron /mg . L - 1 |
< 0.3 |
< 0.3 |
< 0.05 |
< 0.05 |
Al /mg . L - 1 |
— |
— |
< 0.05 |
< 0.05 |