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Hydranautics RO Membranes have set the global benchmark for reliability, efficiency, and innovation in water treatment. With a comprehensive product portfolio tailored to diverse feedwater conditions—from brackish water and seawater to industrial wastewater—Hydranautics membranes deliver exceptional contaminant rejection, energy savings, and long-term durability, making them the preferred choice for municipal, industrial, and commercial water purification projects.
ESPA (Energy-Saving Polyamide) Series: The industry’s most energy-efficient RO membranes, delivering up to 250% higher productivity per unit area than conventional polyamide membranes with uncompromised salt rejection. Ideal for brackish water treatment and commercial applications seeking to reduce energy consumption.
CPA (Composite Polyamide) Series: Recognized as the gold standard for high-purity water applications, offering exceptional salt rejection (up to 99.8%) and ultrapure water production for pharmaceuticals, power generation, and electronic manufacturing.
SWC (Seawater Composite) Series: Engineered for high-salinity seawater desalination, withstanding extreme operating pressures and delivering superior salt rejection to produce safe drinking water from seawater.
LFC (Low Fouling Composite) Series: Features a neutrally charged, hydrophilic surface coating to minimize organic and colloidal fouling, making it ideal for challenging feedwater conditions such as industrial wastewater and surface water.
PRO Series: A specialized lineup for zero liquid discharge (ZLD)/near-zero liquid discharge (ZLD) systems, including high-rejection anti-fouling (PRO-XR), high-pressure (PRO-LF), ion-selective nanofiltration (PRO-XS), and ultrahigh-pressure (PRO-XP) membranes for high-TDS wastewater concentration美国海德能公司.
Brackish water applications: CPA series delivers 99.0–99.8% salt rejection, removing up to 99.9% of bacteria and viruses, 99% of heavy metals (lead, arsenic, cadmium, mercury), and 98% of silica.
Seawater applications: SWC series offers 99.5%+ salt rejection, effectively blocking dissolved salts and minerals in high-TDS feedwater.
Ion selectivity: PRO-XS nanofiltration membranes provide high rejection of divalent ions (e.g., calcium, magnesium) while allowing monovalent ions to pass through, enabling selective ion removal for industrial chemical production.
LFC series: Proprietary neutral hydrophilic coating minimizes adsorption of organic matter, colloids, and scale-forming ions, reducing fouling rates and extending the interval between chemical cleanings.
SWC-LD series: Equipped with low-fouling feed spacers to reduce biological growth (NSF 61 approved for drinking water) and colloidal fouling, ensuring stable performance in seawater treatment.
PRO series: Optimized for high-salinity, high-fouling wastewater, with anti-fouling coatings that maintain flux and rejection even in harsh conditions美国海德能公司.
Temperature range: 5–45°C (optimal at 25°C); SWC series can withstand higher temperatures for seawater applications.
pH range: Continuous operation 2–11; short-term cleaning 1–13 (for chemical maintenance).
Feedwater quality: Tolerates silt density index (SDI) up to 5 and turbidity up to 1 NTU, reducing the need for extensive pre-treatment.
Feedwater Intake: Contaminated water (brackish, seawater, or industrial wastewater) is pumped into the RO system under pressure (150–1200 PSI, depending on feedwater salinity).
Membrane Separation: The TFC membrane’s ultra-fine pores allow only water molecules to pass through, while rejecting larger ions (salts), heavy metals, bacteria, viruses, and organic pollutants.
Permeate & Concentrate Flow: Purified water (permeate) is collected for use, while concentrated contaminants (brine) are discharged to a wastewater treatment system or recycled for further processing.
Spiral-Wound Design: Hydranautics’ spiral-wound configuration maximizes the membrane’s surface area, ensuring high water yield and consistent performance in a compact footprint—critical for space-constrained industrial and commercial facilities.
| Parameter | Specification (Typical Values) | Remarks |
|---|---|---|
| Membrane Material | Thin-Film Composite (TFC) Polyamide | Proprietary anti-fouling TFC for CPA/ESPA/LFC; high-strength TFC for SWC |
| Standard Sizes | 4040 (4"×40"), 8040 (8"×40") | Compatible with 95% of global RO systems |
| Operating Pressure | 150–600 PSI (ESPA/CPA); 800–1200 PSI (SWC) | 150–300 PSI for brackish water; 800+ PSI for seawater |
| Salt Rejection | 99.0–99.8% (CPA/ESPA); 99.5%+ (SWC); 98–99% (LFC) | Depends on feedwater salinity and temperature |
| Water Yield (Permeate Flow) | 4040: 2250–2600 GPD (8.5–9.8 m³/d); 8040: 10,000–14,000 GPD (38–53 m³/d) | ESPA series offers 250% higher yield than conventional membranes |
| Feedwater Temperature Range | 5–45°C (41–113°F) | Optimal at 25°C; SWC series tolerates higher temperatures |
| Continuous pH Range | 2–11 | Short-term cleaning pH: 1–13 |
| Maximum Feedwater SDI | ≤5 | SDI >5 requires enhanced pre-treatment |
| Maximum Feedwater Turbidity | ≤1 NTU | Reduces fouling risk |
| Chlorine Tolerance | ≤0.1 ppm | Free chlorine causes irreversible damage; pre-treatment with activated carbon is required |
| Service Life | 3–5 years | Under normal operation and proper maintenance |
| Heavy Metal Removal | ≥99% (Lead, Arsenic, Cadmium, Mercury) | CPA series delivers highest removal rates |
Install sediment filters (5–10 μm), activated carbon filters (to remove chlorine), softeners (to reduce scale-forming ions), and ultrafiltration (UF) systems (for colloidal/suspended solids removal).
Replace pre-filter elements every 2–4 months (industrial) or 3–6 months (commercial) to maintain SDI ≤5 and turbidity ≤1 NTU.
Operate within recommended pressure, temperature, and pH ranges to avoid membrane damage (e.g., excessive pressure causes membrane deformation; extreme pH degrades TFC material).
Install real-time monitoring systems to track permeate flow, pressure drop, and TDS; adjust parameters promptly to prevent fouling or flux decline.
Daily Flushing: Perform low-pressure (50–75 PSI) flushing for 15–20 minutes to remove surface contaminants, reducing fouling and cleaning frequency.
Startup/Shutdown Flushing: Purge air from membranes with low-pressure feedwater before high-pressure startup; flush with permeate during shutdown to remove concentrated brine (critical for seawater systems).
Cleaning Triggers: Perform chemical cleaning when normalized permeate flow drops by 10–15%, pressure drop increases by 10–15%, or permeate quality declines by 10–15%.
Cleaning Frequency: 3–12 months (industrial wastewater); 6–12 months (commercial brackish water); 12–24 months (seawater with good pre-treatment).
Cleaning Protocol:
Flush with feed/permeate water to remove concentrated brine.
Use Hydranautics-recommended chemicals: alkaline cleaners (pH 10–11) for organic/biological fouling; acidic cleaners (pH 2–3) for mineral scale (calcium, magnesium)美国海德能公司.
Circulate cleaning solution for 60 minutes at 25–35°C; follow dosage and contact time guidelines to avoid membrane damage.
Rinse thoroughly with permeate to remove residual chemicals before resuming operation美国海德能公司.
Note: Avoid cationic surfactants and free chlorine in cleaning solutions; they cause irreversible membrane fouling and degradation美国海德能公司.
Short-Term Shutdown (<3 days): Flush daily with permeate to keep membranes moist; avoid drying out.
Long-Term Shutdown (>30 days): Clean membranes first, then flush with a biocide (e.g., sodium bisulfite) in permeate; seal the system and store in a cool (4.4–35°C/40–95°F), dry, dark place. Refresh the biocide solution every 15–30 days (depending on temperature).
Pre-Installation Storage: Keep new membranes in their original packaging, away from direct sunlight, at 4.4–35°C.
Conduct weekly/monthly inspections to track performance trends (flow, pressure, TDS) and identify early fouling signs (e.g., slime growth, odor).
Maintain a maintenance log to document cleaning events, performance changes, and pre-treatment efficiency.
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