Membrane fouling index

Allowable value

Terms of settlement

Suspended matter, etc.

Turbidity

<1.0NTU

Flocculation, filtration, microfiltration, ultrafiltration

SDI15

 ＜5（15分钟）

Flocculation, filtration, microfiltration, ultrafiltration

Particulate matter

<100个/ml

Flocculation, filtration, microfiltration, ultrafiltration

Microorganism

<1个/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%