1, PERFORMANCE PARAMETERS

Membrane Material

PVC

Molecular Weight Cut-off     (MWCO)

100.000 Daltons

Inner and outer diameters of hollow-fiber

0.9mm/1.6mm

Membrane fiber type

Inside-out hollow-fiber

Characteristics of membrane structure

 Hydrophilic double-compact layers

External Shape

Hollow fiber

2, APPLICATION CONDITIONS

 Pre - filtration

50-150 um

 Max turbidity of inlet water

≤ 15 NTU

    Rated flux

60 – 160 L/M/H

   Running mode

 Cross-flow filtration or dead end filtration

Max inlet water pressure

0.45 MPa

Pressure difference of transmembrane at 20°C (TMP)

28 – 150 KPa

  Max pressure difference of transmembrane

0.2 MPa

 Applicable PH range

2 – 12

Applicable temperature

 5 °C - 45 °C

 Tolerable continuous residual chlorine

100 PPm

 Tolerable interval residual chlorine

200 PPm

3, BACKWASHING DESIGN

 Backwashing pressure

0.25 MPa

 Backwashing flow

220 – 300 L/M/H

 Backwashing frequency

Every 20 -60 minutes

 Backwashing time

30 – 60 seconds every time

 Frequency of chemically enhanced ( CEB )

 Auto adding of additives in backwashing is recommended.

 Time of chemically enhanced backwashing ( CEB )

30 – 60 seconds every time

4, CHEMICALLY WASHING DESIGN

 Frequency of chemically washing

  Every 1~4 months or when TMP is over 0.15 MPa

 Pressure of chemically washing

0.15 MPa

 Flow of chemically washing

200 – 250 L/M/H

 Time of chemically washing

 60 – 90 minutes every time

Acid washing chemical

 Citric acid or oxalic acid ( mixed into solution with PH = 2 )

 Alkali washing chemical

 NaOH ( mixed into solution with PH=12)

5, INDEX OF OUTPUT WATER

 Turbidity of output water

< 0.1 NTU

 Index of silt density

< 1.5

 Microorganism, pathogen

99.99 % Removed

     Remarks:

1.      Pure water flux is measured with pure water at 25°C with inlet water pressure of 0.1MPa.

2.      If water are from surface water,river water or well water and so on,pre-treatment shall be done. It is suggested that a 50-150 um precision filter shall be equipped to have inlet water with turbidity ≤15NTU.