Membrane fouling index | Allowable value | Terms of settlement | |
Suspended matter, etc. | Turbidity | <1.0NTU | Flocculation, filtration, microfiltration, ultrafiltration |
SDI15 | ＜5（15分鐘） | Flocculation, filtration, microfiltration, ultrafiltration | |
Particulate matter | <100個/ml | Flocculation, filtration, microfiltration, ultrafiltration | |
Microorganism | <1個/ml | Sterilization, microfiltration, ultrafiltration | |
Metallic oxide | Iron，Fe3+ | <0.05PPm | Oxidation + precipitation or filtration |
Manganese | <0.05PPm | Using dispersant | |
Scaling substance | CaCO₃ | LSI<0 | Recovery rate, pH value, scale inhibitor |
CaSO4 | <230% | Recovery rate, scale inhibitor | |
BaSO4 | <6000% | Recovery rate, scale inhibitor | |
SRSO4 | <800% | Recovery rate, scale inhibitor | |
CaF2 | Concentration of concentrated water <1.7mg/l | Recovery rate | |
Ca3(PO4)2 | The concentration of the concentrated water side can not exceed the solubility | Recovery rate | |
SiO2 | <100% |
| |