Environmental Engineering Reference
In-Depth Information
Table 9.5
Typical NF and RO performance specifications [after 12].
Manufacturer
A
B
C
D
Process
Seawater RO
Brackish RO
Brackish RO
NF
Configuration
Spiral wound
Spiral wound
Spiral wound
Spiral wound
Membrane polymer
Polyamide
Composite polyamide
Cellulose-acetate blend
Composite polyamide
27.87 m
2
(300 ft
2
)
37.16 m
2
(400 ft
2
)
2
(528 ft
2
)
37 m
2
(400 ft
2
)
Area
49 m
Minimum salt rejection
99.6%
99.0%
98%
70% NaCl, 95% MgSO
4
Permeate flowrate
19 m
3
/
day
45.4 m
3
/
day
39.7 m
3
/
day
47 m
3
/
day
(5 kgal
/
day)
(12 kgal
/
day)
(10.5 kgal
/
day)
(12.5 kgal
/
day)
in
2
)
in
2
)
in
2
)
in
2
)
Max. applied pressure
8.3 MPa (1200 lb
/
4.16 MPa (600 lb
/
4.14 MPa (600 lb
/
1.7 MPa (250 lb
/
Max. feed flowrate
Process dependent
284 L
/
min
137.8 L
/
min
265 L
/
min
(75 gal
/
min)
(36.4 gal
/
min)
(70 gal
/
min)
45
◦
C (113
◦
F)
45
◦
C (113
◦
F)
40
◦
C (104
◦
F)
35
◦
C (95
◦
F)
Max. operating temperature
Feed water pH range
4-11
3-10
4-6
3-9
Max. feed water turbidity
1.0 NTU
1.0 NTU
1.0 NTU
1.0 NTU
Max. chlorine concentration
0
<
0.1 mg
/
L
1.0 mg
/
L
<
0.1 mg
/
L
Single element recovery
17%
15%
20%
15%
in
2
)
in
2
)
Max. pressure drop
Process dependent
69 kPa (10 lb
/
104 kPa (15 lb
/
Process dependent
per element
Data from manufacturer's literature.
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