| STRO/STNF Membrane Introduction |
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With the development of membrane technology industry, there are differentiated requirements to the performance of the membrane products, such as lower feed quality requirements, higher pressure to improve concentration ratio, longer cleaning cycle and service life. As a result, the open channel type with high pressure membrane arises at the historic moment.
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Features High strength design, up to 120 bar operating pressure Open feed spacer with low flow resistance and concentration polarization Spiral wound structure with more membrane area More options for feed spacer |
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Applications Industrial wastewater High salts wastewater Spiral wound RO/NF concentrates |
Open feed spacers
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STRO/STNF module STRO/STNF membrane High pressure vessel SUS center link Inlet and outlet pipe and accessories
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Comparison of STRO/STNF Membrane and conventional RO/NF Membrane
Identical
Difference
High membrane area
SUS center link with high strength and stability
Integrated design
Uniform internal water distribution structure
Cross flow filtration
Reduced impact of the membrane module flow, higher cross-flow
Open feed channel
STRO/STNF Membrane Specifications
Type
STRO
STNF
Model
STRO1-8035
STRO5-8042
STNF2-8042
Membrane type
RO1
RO5
NF2
Membrane materia
Composite Polyamide
Membrane effective area (m2)
25
27
27
Element configuration *
Spiral, fierglass, brine seal
Feed flux range (m3/h)
5.5-12
5.5-12
Recommended feed flux (m3/h)
10
10
Stable permeate flux ** (m3/d)
24
18
25
Stable salt rejection **(%)
98.5
99.5
98
Min. salt rejection (%)
97.5
99
96
Feed spacer
Special open channel
Max. TMP (bar)
0.7
0.7
Max. operation pressure (bar)
120
90
Max. operation temperature (℃)
40
40
Feed (SDI)
≤ 6.5
≤ 6.5
pH (continuous)
3-11
3-11
pH (cleaning)
2-12
2-12
Chlorine tolerance (ppm)
≤ 0.1
≤ 0.1
* Salt seal installed on the end of the flow, low pressure side / permeate side.
** Stable flux, salt rejection based on the following test conditions:
RO1: 2000mg/l NaCl , pressure 15.5bar, recycle rate 15% , temperature 25℃, pH=8.
RO5:32,000 mg/l NaCl , pressure 55bar, recycle rate 8%, temperature 25℃, pH=8.
NF2:2000 mg/l MgSO4, pressure 7barr, recycle rate 15% , temperature 25℃, pH=8.
Note: We can provide any flat sheet membrane to make ST module, for example: STRO4-8035, STRO5-8035, STRO1-8042, STNF1-8042, etc.
| Mod |
8035 |
8042 |
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Element total length (A) |
890mm | 1070mm |
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Element diameter (B) |
200mm | 200mm |
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Center tube outer diameter (C) |
60.2mm | 60.2mm |
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Membrane body length (D) |
838mm | 1016mm |
