4040 RO MEMBRANE ELEMENTS

Sapstone Brackish Water (BW) Series RO membrane elements
Advantage
1.This series of membrane element have larger effective filtration area and wider inflow path.
2.Not only does it increase the water yield, but diminish the frequency of cleaning.
3. Low energy and cost to obtain the highest quality of water.
4. Can working for 2000-3000ppm feed water.
Type Model Performance Structure Parameter
rejection
/% permeate flux
/gpd（m3/d） Effective membrane area
/ft2 Flowpath Dia
/mil Inner pipe Dia
/mm
Model BW-8040 99.5 10000 380 31 28.7
BW-8040-400 99.5 10600 400 30 28.7
BW-8040-400/34 99.5 10600 400 34 28.7
BW-8040-440 99.5 12000 440 34 28.7
BW-4040 99.5 2400 90 31 19.0
BW-4021 99.5 900 38 31 19.0
Testing conditions Testing Pressure 225psi（1.55 MPa）
Temperature of testing 25 ℃
Testing Concentration（NaCl） 2000 mg/L
pH Value of testing 7.5
Recovery of single membrane element 20%





Operation limits and conditions Max. Working Pressure 600 psi（4.14 MPa）
Max. Feedwater Flow 75 gpm（17 m3/h）（8040）
16 gpm（3.6 m3/h）（4040）
Max inflow temperature 45℃
Max flow SDI15 5
Residual Chlorine Concentration of feed water ＜0.1 mg/L
pH range of Feed water durng Continuous Operation 3～10
pH range of feed water during chemical cleaning 2～12
Max, Pressure Drop of Single membrane element 15 psi（0.1 MPa）