Reverse Osmosis Membranes for Difficult Industrial Water
Blue Cycle Limited supplies open-channel flat sheet, high-concentration and high-temperature reverse osmosis membrane modules for industrial wastewater reuse, brine concentration and hot-water desalination. Select the membrane platform according to feed temperature, salinity, fouling risk, operating pressure and the required treatment objective.
Choose the RO Membrane Platform for Your Feedwater
The three membrane families address different operating limits. Start with the condition that is most difficult to manage—channel fouling, high dissolved-solids concentration or elevated feed temperature—then confirm the model and operating point from the complete water analysis.
Open-Channel Flat Sheet RO Membrane Modules
HD/CDRO Series
The HD/CDRO platform uses an open 1.8 mm feed channel, membrane sheets and flow-guiding discs inside a pressure housing. The flow path creates crossflow and surface turbulence without the narrow feed spacer used in conventional spiral-wound elements. It is intended for industrial water streams where suspended solids, colloids, concentration polarization or channel blockage are important design concerns.
- Feedwater with elevated fouling or plugging risk
- Industrial desalination, reuse and zero-liquid-discharge pretreatment
- Model selection by pressure class, membrane area and required salt rejection
HPRO High-Concentration Reverse Osmosis Membranes
HPRO membranes are designed for high-salinity streams where the objective is to continue membrane concentration beyond the practical range of conventional high-rejection RO. The lower-rejection concentration design supports brine volume reduction and preparation for downstream evaporation, crystallization or resource-recovery processes.
- High-TDS wastewater or RO concentrate
- Brine concentration above the conventional RO range
- Selection by feed composition, osmotic pressure, scaling potential and target concentration
High-Temperature Flat Sheet RO Membrane Modules
The high-temperature flat sheet RO platform is intended for hot industrial water that would otherwise require cooling before membrane desalination. The HT100 model combines a heat-resistant polyamide composite membrane with an open-channel flat sheet module for high-temperature wastewater and hot-material purification.
- Pretreated feedwater operating up to 80°C
- Hot produced water, process water and material purification
- Selection by temperature, salt concentration, oil and hardness, pressure and reuse target
Match the Membrane to the Limiting Condition
Narrow Feed Channels Can Become the Bottleneck
Particles, colloids and deposits can become trapped inside conventional spacer-filled channels, increasing pressure loss and making cleaning recovery more difficult.
The HD/CDRO platform replaces the narrow spacer channel with an open 1.8 mm flow path formed by membrane sheets and flow-guiding discs. The resulting crossflow and turbulence help reduce channel blockage and concentration polarization.
Conventional RO Reaches a Concentration Limit
As dissolved-solids concentration rises, osmotic pressure, scaling risk and the required operating pressure increase. A standard high-rejection membrane may no longer be the appropriate concentration stage.
HPRO uses a concentration-oriented membrane configuration for high-salinity feed and brine reduction. Final concentration must be evaluated against the salt composition, scaling control, pretreatment and downstream process.
Cooling Hot Feedwater Adds Another Process Step
Standard RO membranes normally require lower feed temperatures. Cooling hot wastewater before RO and reheating the recovered water can add equipment and energy demand.
The HT100 platform allows suitably pretreated feedwater to enter the membrane stage at temperatures up to 80°C, helping simplify hot-water desalination and reuse configurations.
RO Membrane Family Comparison
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Note: Catalog values describe the available membrane platforms, not a guaranteed project result. Flux, recovery, rejection, pressure and concentration endpoint depend on feed composition, pretreatment, temperature, scaling control and system design.
HD/CDRO Model Range
HD models provide different membrane areas, pressure classes and salt-rejection levels while retaining the same open-channel flat sheet principle. Use the model table as an initial comparison and confirm the final operating point through feedwater evaluation.
| Model | Membrane Area | Average Pressure Drop per Module | Minimum Salt Rejection | Stable Salt Rejection |
|---|---|---|---|---|
| HD9-140bar | 9.0 m² | 2–4 bar | 98.5% | 99.0% |
| HD15-30bar | 15.0 m² | 1–3 bar | 96.0% | 98.0% |
| HD15-90bar | 15.0 m² | 2–4 bar | 98.0% | 99.2% |
| HD17-30bar | 15.0 m² | 1–3 bar | 96.5% | 98.5% |
| HD17-90bar | 15.0 m² | 2–4 bar | 98.0% | 99.2% |
Shared HD/CDRO specifications:
- Anti-fouling polyamide composite RO membrane
- 1.8 mm open feed channel
- Maximum operating temperature: 45°C
- Continuous operating pH: 2–11
- Short cleaning pH: 1–13 for up to 30 minutes
- Max continuous temp above pH 10: 35°C
- Free chlorine tolerance: below 0.1 ppm; complete chlorine removal is recommended
The pressure figure in each model name identifies its pressure class. It does not mean that every project should operate at the maximum class pressure.
Specialized Operating Windows
HPRO High-Concentration Membrane
HPRO is intended for concentration duty rather than maximum permeate salt rejection. Its controlled salt passage supports further volume reduction as brine concentration and osmotic pressure increase.
HPRO should be evaluated with a complete ionic analysis. Calcium, magnesium, silica, sulfate, alkalinity, organics and other scaling or fouling constituents can determine whether additional pretreatment or salt separation is required before concentration.
HT100 High-Temperature Membrane Module
HT100 is the specified high-temperature flat sheet module for hot-water desalination and reuse.
Reference rejection conditions: 32,000 ppm NaCl solution, 25°C, pH 8.0, 55 bar test pressure and 35% recovery.
Industrial Applications
Industrial Wastewater Reuse and ZLD
HD/CDRO modules can be evaluated for municipal wastewater reuse, mine water, steel and coking wastewater, and other industrial desalination or zero-liquid-discharge systems where an open feed channel is preferred.
Brine Concentration and Resource Recovery
HPRO can serve as a membrane concentration stage before evaporation, crystallization or resource-recovery processes. The pretreatment and membrane sequence must be selected from the actual salt composition and target concentrate.
High-Temperature Produced Water
HT100 is designed for hot produced water and other high-temperature wastewater streams where cooling before desalination is undesirable. Oil, hardness, silica, suspended solids and temperature must be addressed together during process selection.
Hot Process Water and Material Purification
High-temperature membrane treatment can also be evaluated for chemical processing, power-plant circulating water, pharmaceutical water and other hot-material purification duties when the feed composition and required product-water quality are compatible.
Built Around the Feedwater, Not a Generic RO Element
Open-channel module construction
The flat sheet and flow-disc structure provides a 1.8 mm feed channel without a conventional spacer mesh. This creates a different hydraulic and cleaning path for industrial water with elevated fouling or plugging risk.
Pressure classes for different treatment duties
The HD range includes 30, 90 and 140 bar model classes. HPRO and HT100 extend the selection toward high-concentration and high-temperature duties instead of forcing every feed stream into one membrane configuration.
Membrane-to-system integration
Blue Cycle’s membrane platforms can be incorporated into standardized skid-mounted and containerized treatment equipment. This gives engineering teams a path from membrane selection to a modular treatment package without presenting the equipment as a separate membrane category.
Visible technical boundaries
Model-specific membrane area, pressure drop, temperature, pH, rejection and flow conditions are presented openly so that an inquiry can begin with a defined operating window rather than a generic product claim.
High-Temperature Produced Water Application Experience
In 2021, a high-temperature produced-water project was delivered for Sinopec’s Chunfeng Oilfield. The treatment train combined pretreatment with a high-temperature flat sheet reverse osmosis system so that hot produced water could be desalinated and reused as boiler feedwater for steam-injection operations.
| Project Condition | Published Project Data |
|---|---|
| Design feed capacity | 10,000 m³/day |
| Feed temperature | 75–80°C |
| Feed TDS | 27,500 mg/L |
| Feed COD | 650–800 mg/L |
| Feed oil | 50 mg/L |
| Feed total hardness | 5,260–6,800 mg/L |
| Treatment route | Pretreatment plus high-temperature flat sheet RO |
| Product-water target | Industrial boiler-water requirements under GB/T 1576-2018 |
The case illustrates the role of temperature-resistant membrane equipment in a complete produced-water treatment process. It should not be treated as a guarantee that another feedwater will achieve the same recovery, rejection or operating result.
Reverse Osmosis Membrane Selection Guide
When should an open-channel flat sheet RO module be considered?
Consider an open-channel module when the feedwater has a higher risk of particle accumulation, colloidal fouling or channel blockage than a conventional clean-water application. The wider flow path does not eliminate pretreatment or cleaning, but it changes how the feed moves across the membrane and how deposits can be managed.
The HD/CDRO range should be compared by pressure class, membrane area, required rejection, feed flow and the complete water analysis.
How is HPRO different from a conventional high-rejection RO membrane?
A conventional RO membrane is normally selected to maximize salt rejection and produce lower-salinity permeate. HPRO is intended for concentration duty and uses controlled salt passage to continue reducing brine volume as osmotic pressure rises.
It is therefore evaluated by concentration endpoint, scaling risk, operating pressure, downstream treatment and total process balance—not by salt rejection alone.
Can reverse osmosis treat high-temperature water directly?
Only a membrane and module designed for the intended temperature should be used. The HT100 operating window allows suitably pretreated feedwater up to 80°C, while the standard HD/CDRO and HPRO ranges are limited to lower temperatures.
Temperature must be assessed together with pH, pressure, membrane compatibility and feed composition.
What information is needed to select an industrial RO membrane?
Begin with:
- Feed flow and operating temperature
- TDS and complete ionic composition
- pH, COD, suspended solids and turbidity
- Oil, hardness, silica and other scaling constituents
- Existing pretreatment
- Required permeate quality and recovery
- Target concentrate volume or concentration
- Available pressure and downstream treatment route
These inputs allow the membrane family and preliminary operating window to be evaluated without assuming that one model fits every industrial water stream.
How should chlorine and membrane cleaning be handled?
The published HD/CDRO and HT100 specifications require free chlorine below 0.1 ppm and recommend complete chlorine removal. Cleaning chemistry must remain within the specified model pH and temperature limits.
Cleaning frequency and chemical selection depend on the actual foulants and should be developed from feedwater analysis and operating data.
Discuss Your Reverse Osmosis Feedwater
Share the feedwater analysis, temperature, treatment capacity and required product-water or concentrate target. Blue Cycle Limited can use these conditions to discuss the appropriate membrane family and a preliminary system configuration.