Industrial Flat-Sheet Membranes for Complex Water Treatment
Blue Cycle supplies open-channel flat-sheet membrane modules for desalination, salt separation, and high-temperature water treatment. Our four product families help engineers perfectly match membrane structures to specific operating conditions.
- HD RO membranes for desalination & water reuse
- HDNF membranes for targeted ion separation
- HPRO membranes for high-salinity concentration
- HT membranes for high-temperature treatment
Open-Channel Flat-Sheet Membrane Modules for Pressurized Systems
The Blue Cycle product range consists of pressurized flat-sheet membrane modules rather than submerged flat-sheet MBR cassettes or loose membrane rolls. A module combines membrane sheets, flow-guiding discs, a central tie rod and a pressure-resistant housing.
Feed water moves through the space between the membrane sheets and flow-guiding discs. The open-channel configuration is designed for industrial streams where suspended matter, concentration polarization and cleaning access must be considered together with pressure, temperature and separation performance.
Use this product category when the project requires RO or NF separation, salt concentration or elevated-temperature treatment in a pressurized membrane system.
Diagram labels:
- Pressure-Resistant Housing
- Membrane Sheet
- Flow-Guiding Disc
- Central Tie Rod
- Feed Channel
- Permeate Outlet
Choose the Membrane Family by Separation Task
The four series address different process objectives. Start with the required output, then check feed composition, pressure, temperature and the role of downstream treatment.
HD Flat-Sheet RO Membranes
For desalination and reuse projects that require high salt rejection. Available model directions include HD9-140bar, HD15-30bar, HD15-90bar, HD17-30bar and HD17-90bar.
Municipal and industrial water desalination, wastewater reuse and high-salinity treatment.
Operating pressure, membrane area, feed-water fouling tendency and target permeate quality.
HDNF Selective Nanofiltration Membranes
For projects that need selective separation between monovalent and multivalent ions. Available models include HDNF15P, HDNF30P and HDNF100P.
Salt separation, multivalent salt concentration and processes that require different permeate and concentrate ion profiles.
Ion analysis, separation target, operating pressure, flux and downstream salt handling.
HPRO High-Concentration Membranes
For saline streams that require additional membrane concentration before evaporation or another downstream process. The documented product direction uses a 15 m² membrane configuration with a stated operating-pressure limit below 90 bar.
High-salinity concentration where the concentration endpoint and downstream process must be evaluated together.
Feed concentration, target concentration, osmotic pressure, flux and downstream treatment.
HT High-Temperature Flat-Sheet Membranes
For purification and separation of elevated-temperature water or process streams. The HT100 configuration uses a polyamide composite high-temperature membrane in a pressurized flat-sheet module.
High-temperature wastewater, produced water and process streams where cooling would add another system step.
Continuous temperature, pressure, salinity, hardness, pH, pretreatment and reuse target.
Address the Constraints Behind Membrane Selection
When a Narrow Feed Channel Raises Fouling Concerns
Industrial wastewater can contain suspended matter, colloids, organics and scaling ions. A narrow spacer channel may create more locations where deposits can accumulate. Blue Cycle modules use an open channel formed between flat membrane sheets and flow-guiding discs, giving engineers a different flow-path option for challenging feed conditions.
When One Membrane Type Cannot Meet Every Separation Target
RO, selective NF and concentration duties produce different permeate and concentrate streams. The HD, HDNF and HPRO series separate these functions into distinct product directions, allowing the membrane choice to follow the required salt rejection, ion selectivity or concentration objective.
When Feed Temperature Exceeds a Conventional Design Envelope
Temperature affects membrane material, flux, pressure and system design. The HT series provides a dedicated high-temperature product direction, while actual selection still requires the continuous operating temperature and complete feed-water analysis.
When the Membrane Must Connect with a Larger Process
A membrane stage may sit after pretreatment or before reuse, evaporation, crystallization and resource-recovery operations. Blue Cycle’s product scope includes membrane components, process-package discussion and skid-mounted or containerized equipment configurations, helping define interfaces between the membrane and surrounding process.
Which Flat-Sheet Membrane Series Fits the Process Objective?
| Series | Primary Separation Objective | Key Operating Considerations | Typical Project Direction |
|---|---|---|---|
| HD | Desalination and permeate-water production | Pressure, salt rejection, feed fouling tendency and pretreatment | Municipal or industrial water reuse and high-salinity desalination |
| HDNF | Selective passage and rejection of different ion groups | Complete ion analysis, pressure, flux and required salt-stream composition | Monovalent and multivalent ion separation |
| HPRO | Further concentration of saline streams | Feed concentration, target endpoint, osmotic pressure and downstream process | Brine concentration before evaporation or resource recovery |
| HT | Separation at elevated feed temperatures | Continuous temperature, pressure, pH, salinity, hardness and pretreatment | High-temperature produced water and industrial process water |
Compare the Operating Envelope Before Detailed Design
HD Series Shared Parameters
- Membrane material
- Fouling-resistant polyamide composite RO membrane
- Flow-channel width
- 1.8 mm
- Maximum operating temperature
- 45°C
- Residual chlorine tolerance
- Below 0.1 ppm with complete removal recommended
- Continuous operating pH
- 2 to 11
- Short-term cleaning pH
- 1 to 13 for 30 minutes
Note: Membrane area, pressure rating, pressure drop and salt rejection differ by HD model. Use the individual model data when completing system calculations.
HT100 Identification
- Membrane material
- Polyamide composite high-temperature membrane
- Maximum operating pressure
- 90 bar
- Membrane area
- 15 m²
- Flow-channel width
- 1.8 mm
- Maximum operating temperature
- 80°C
- Continuous operating pH
- 6 to 8
- Documented test conditions
- 32,000 ppm NaCl solution at 25°C, pH 8.0, 55 bar and 35 percent recovery
Note: The maximum operating boundary is not a recommended design point. Continuous temperature, pressure and feed chemistry must be reviewed together.
HDNF Series Comparison
| Model | Maximum Operating Pressure | Membrane Area | Flow-Channel Width | Flux Range | Maximum Temperature |
|---|---|---|---|---|---|
| HDNF15P | 15 bar | 17 m² | 2.5 mm | 5 to 50 LMH depending on water quality | 45°C |
| HDNF30P | 30 bar | 17 m² | 2.5 mm | 5 to 50 LMH depending on water quality | 45°C |
| HDNF100P | 90 bar | 15 m² | 2.5 mm | 5 to 50 LMH depending on water quality | 45°C |
Note: HDNF selection depends on the actual monovalent and multivalent ion composition. Model-table values do not by themselves predict separation results for a new feed stream.
How to Evaluate an Industrial Flat-Sheet Membrane Supplier
What is the difference between this product range and a flat-sheet MBR membrane?
A flat-sheet MBR membrane is normally submerged in a biological treatment tank and is commonly used for solid-liquid separation. The Blue Cycle range covered on this page consists of pressurized RO and NF membrane modules used for dissolved-salt separation, selective ion separation, concentration and high-temperature treatment. The two product groups serve different process stages and should not be treated as interchangeable.
When should an engineer choose RO instead of selective NF?
Choose RO when the principal objective is broad desalination and permeate-water production. Selective NF is more appropriate when the process needs different passage and rejection behavior for monovalent and multivalent ions. The decision should be based on a complete ion analysis and the required composition of both output streams.
Why does an open flow channel matter?
Channel geometry affects how feed water moves across the membrane surface and where suspended or precipitated material may accumulate. An open-channel design can be considered when the feed has a higher fouling tendency or when cleaning access is an important system constraint. Pretreatment and operating control remain necessary; channel structure does not make a membrane immune to fouling or scaling.
How should a high-temperature membrane be selected?
Start with continuous operating temperature rather than a short temperature peak. Then review pressure, pH, salinity, hardness, silica, oil and other contaminants. The HT100 has a documented maximum operating temperature of 80°C, but the final system condition must remain within the combined temperature, pressure and chemical limits.
What information is required to compare membrane options?
The minimum useful technical package includes feed-water analysis, treatment capacity, operating temperature, target permeate quality, required recovery or concentration objective and the planned destination of the concentrate. An existing process-flow diagram and available utility conditions make equipment-scope discussions more precise.
Can the membrane stage be supplied as integrated equipment?
Blue Cycle’s documented scope includes flat-sheet membrane products, process-package support, skid-mounted equipment and containerized equipment directions. The appropriate boundary depends on treatment capacity, site access, utility connections, upstream pretreatment and downstream reuse or concentration processes.
Industrial Water Conditions Addressed by the Product Range
High-Salinity Industrial Wastewater
HD and HPRO product directions can be evaluated when a process needs desalinated permeate, a more concentrated brine stream or a connection to downstream evaporation. Feed concentration and the rising osmotic pressure must be included in the selection.
Selective Salt Separation
HDNF membranes can be evaluated where monovalent and multivalent ions need different separation behavior. Relevant projects include salt purification and resource-recovery processes in which the composition of both permeate and concentrate matters.
High-Temperature Produced Water
HT flat-sheet membranes are intended for elevated-temperature streams, including produced-water and industrial process-water conditions. Oil, hardness, silica, salinity and pretreatment requirements must be evaluated alongside temperature.
Industrial Water Reuse
HD flat-sheet RO membranes can support desalination stages in municipal and industrial water-reuse systems. Required product-water quality, upstream treatment and concentrate management define the system rather than the membrane alone.
Review the Membrane Structure, Model Range and Equipment Scope
Blue Cycle’s industrial flat-sheet membrane range is documented through module structure diagrams, model parameter tables and process-flow concepts. These materials help engineering and procurement teams distinguish the four membrane directions and identify which operating conditions require further review.
Product Identification
Series and model information separates desalination, selective nanofiltration, high-concentration and high-temperature duties instead of presenting every application under one membrane designation.
Process Context
Process diagrams connect membrane stages with pretreatment, water reuse, concentration and resource-recovery routes. They provide a basis for discussing interfaces without treating a preliminary process concept as a finished project design.
Equipment Direction
Skid-mounted and containerized arrangements are included in the available equipment scope. Selection depends on treatment capacity, site space, transport, maintenance access and upstream and downstream connections.
Discuss Your Feed Water and Separation Target
Submit the available water conditions and required output to begin a focused discussion about the HD, HDNF, HPRO or HT product direction and the possible equipment scope.