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Items | Permissible Value | Probably Consequence of Excessive Standard | Improvement Suggestions | |
Suspended solids | Tubidity | <1NTU | Sludge ,colloid pollution | Flocculation and filtration |
SDI15 | <5 | |||
Metal oxides | Fe ( mg/L) | <0.05 | Iron Pollution | Oxidation precipitation/filtration |
Mn (mg/L) | <0.05 | |||
Scale forming matter | CaCO3 | LSI<0 | Concentrated water side does not permit scaling | Decrease recovery rate , PH value , or add scale inhibitor |
Other insoluble salt | / | |||
Organics | Oil | 0 | Organics and oil | Air |
TOC (mg/L) | <10 | Organics pollution | Activated carbon adsorption , filtration | |
CODcr (mg/L) | <10 | |||
BOD5 (mg/L) | <5 | |||
Si (mg/L) | <20 | Colloid pollution | ||
PH | 3-10 | Too low or too high PH will accelerate the aging speed of membrane | Regulation of Acid-base | |
Temperature | 5-45°C | Low temperature will easily produce scaling of undissolved salt High temperature will accelerate the aging speed of membrane | Heat exhanger | |
Oxidizer | Residual chlorine (mg/L) | <0.1 | Membrane system will be oxidized | Reductant or aclivated carbon adsorption |
Ozone and others | 0 |