The HSRO series is a specialized anti-oxidation brackish water reverse osmosis membrane designed for raw water with residual chlorine and oxidants. Adopting covalently grafted sacrificial antioxidant coating technology, it effectively avoids irreversible damage to polyamide separation layers caused by free chlorine, ozone and hypochlorite. It perfectly solves the common industry pain point: ordinary RO membranes degrade rapidly under chlorinated feed water and require extra activated carbon dechlorination equipment.
HSRO Series: Chlorine Resistant Brackish Water RO Membrane
The HSRO series is a specialized anti-oxidation brackish water reverse osmosis membrane designed for raw water with residual chlorine and oxidants. Adopting covalently grafted sacrificial antioxidant coating technology, it effectively avoids irreversible damage to polyamide separation layers caused by free chlorine, ozone and hypochlorite. It perfectly solves the common industry pain point: ordinary RO membranes degrade rapidly under chlorinated feed water and require extra activated carbon dechlorination equipment.
HSRO series is spiral-wound modified aromatic polyamide brackish water RO membrane with regenerable chlorine sacrificial functional layer, available in universal 4040 small-size and 8040 large-size complete specifications to match skid-mounted industrial equipment and centralized municipal water treatment systems. Traditional unmodified polyamide membranes are vulnerable to chlorine oxidation: free chlorine breaks amide bonds, causing permanent drop of salt rejection and shortened service life, forcing users to install dedicated dechlorination filters and reducing project space utilization.
HSRO innovatively grafts glycylglycine sacrificial groups on the membrane surface via covalent bonding. These sacrificial functional groups preferentially react with residual chlorine to shield the core separation layer, and can be fully regenerated through simple alkaline cleaning without permanent performance loss. It stably treats brackish raw water with TDS ≤10,000ppm and continuous residual chlorine up to 0.3mg/L, efficiently intercepts dissolved salts, colloids, microorganisms and organic pollutants while maintaining long-term stable permeate quality. All membrane sheets and finished elements are self-developed and produced in-house, with consistent batch flux and oxidation resistance, becoming the core membrane choice for water plants, municipal tap water reuse and industrial wastewater with residual oxidants.
Technical Characteristics
1. Unique chlorine & oxidation tolerance performance: Continuous feed residual chlorine tolerance up to 0.3mg/L, 3 times higher than conventional brackish RO membranes; maintains stable salt rejection after long-term exposure to chlorinated water
2. Stable desalination index: Nominal salt rejection ≥99.5%, minimum guaranteed salt rejection ≥99.3%, excellent removal rate of silica, nitrate and organic pollutants
3. Complete standard specifications:
HSRO-4040: 4-inch × 40-inch, effective area 78 sq.ft (7.6㎡), standard permeate flow 2400GPD (9.1m³/d)
HSRO-8040: 8-inch × 40-inch, effective area 400 sq.ft (37.2㎡), standard permeate flow 9800GPD (37.1m³/d)
4. Wide chemical adaptation window: Continuous operating pH 2.0–11.0; chemical cleaning pH 1.0–13.0, supports acid-alkali alternating regeneration cleaning for sacrificial anti-chlorine layer
5. Operating working conditions: Applicable temperature 5℃–45℃, maximum operating pressure 4.1MPa (600psi), maximum single-element pressure drop ≤15psi
6. Strict inlet control parameters: Max inlet SDI15 ≤5.0, inlet turbidity ≤1.0NTU; ordinary RO limits chlorine below 0.1mg/L while HSRO allows stable operation under 0.3mg/L residual chlorine
7. Optimized 34mil biostatic wide feed spacer: Eliminates flow dead zones, mitigates concentration polarization, reduces colloid and microbial adhesion
Reinforced fiberglass winding shell: High mechanical impact resistance, supports multi-element series connection inside standard pressure vessels
8. Reinforced fiberglass winding shell: High mechanical impact resistance, supports multi-element series connection inside standard pressure vessels
Core Product Advantages
1. Outstanding anti-oxidation performance, drastically extend membrane service life
Equipped with regenerative sacrificial anti-chlorine coating, HSRO avoids irreversible amide bond fracture under continuous chlorine impact. Under feed water with 0.2–0.3mg/L residual chlorine, its service life reaches 3–5 years, while ordinary brackish membranes fail within 1–2 years under identical water conditions. Regular alkaline cleaning restores the sacrificial layer’s chlorine absorption capacity without permanent membrane damage.
2. Simplify pretreatment system, cut overall project investment
Conventional RO projects must configure large activated carbon filters or sodium metabisulfite dosing systems to remove chlorine. HSRO tolerates moderate residual chlorine, allowing customers to downsize or cancel dechlorination units, lowering equipment procurement, pipeline and floor space cost by 18–25%. It reduces daily consumption of dechlorination chemicals and lowers long-term system operation cost.
3. Stable water quality output without performance attenuation
The covalent grafted anti-oxidation layer will not peel off during long-term water flow scouring. Continuous operation test data shows salt rejection only declines less than 0.2% after 2 years of chlorinated raw water treatment, delivering consistent clean water standard for industrial production and municipal drinking supply.
4. Superior anti-fouling & easy maintenance
Hydrophilic negative-charged membrane surface repels charged contaminants electrostatically; wide 34mil flow channel weakens concentration polarization. With qualified pretreatment, chemical cleaning cycle extends to 6–8 months, less frequent maintenance compared to common brackish membranes suffering chlorine-induced fouling.
5. Universal standard size for direct replacement
4040 and 8040 dimensions match all mainstream domestic and imported membrane housings. Old water treatment systems using ordinary BW series membranes can directly upgrade to HSRO without modifying pipeline layout, convenient for equipment reconstruction projects.
Wide Application Fields
Municipal Tap Water Deep Purification
Tap water contains residual chlorine from disinfection; HSRO eliminates demand for dedicated dechlorination pretreatment, producing qualified domestic purified water for urban central water supply stations and community water plants.
Industrial Brackish Water & Underground Well Water Desalination
Groundwater with chlorine-containing disinfection agents, factory recycled water with residual hypochlorite; applied to power plant boiler feed water, electronics factory cleaning water, food & beverage process water pre-desalination.
Industrial Wastewater Reuse with Oxidants
Printing & dyeing, chemical and municipal sewage plant reclaimed water containing residual chlorine/ozone; deep desalination realizes zero liquid discharge, reduces wastewater discharge fees.
Small & Medium Skid-Mounted Water Treatment Equipment
Mobile emergency water supply devices, commercial large water dispensers, villa integrated water purification systems; compact HSRO-4040 fits limited installation space without extra dechlorination equipment.
Laboratory & Medical Pure Water Preparation
Lab test water, hospital medical purified water systems where raw tap water carries residual chlorine; guarantees stable pure water resistivity without frequent membrane replacement.
Rural Underground Brackish Water Treatment
Rural well water with disinfected residual chlorine; solves village safe drinking water shortage with simplified pretreatment workflow.
Frequently Asked Questions
Q1: What is the biggest difference between HSRO and ordinary brackish RO membranes?
A1: HSRO features regenerable chlorine sacrificial coating, tolerates continuous feed residual chlorine up to 0.3mg/L, 3 times higher than standard BW membranes. It cancels mandatory dechlorination pretreatment and extends service life under chlorinated raw water.
Q2: What TDS range of raw water is HSRO suitable for?
A2: Designed for brackish water with TDS ≤10,000ppm, applicable to underground well water, municipal tap water and low-salinity industrial reclaimed water with residual oxidants.
Q3: How long is the service life of HSRO under chlorinated feed water?
A3: With SDI ≤5.0 inlet water and regular alkaline regeneration cleaning, service life reaches 3–5 years; ordinary brackish membranes only last 1–2 years under identical chlorine concentration.
Q4: Is alkaline cleaning required to regenerate its anti-chlorine layer?
A4: Yes, monthly mild alkaline circulation cleaning restores the sacrificial functional groups’ chlorine capture capacity, maintaining long-term oxidation resistance.
Q5: Can HSRO directly replace traditional BW30 series membrane elements?
A5: Yes, HSRO-4040 and HSRO-8040 adopt industry universal standard sizes, fully compatible with existing pressure vessels without system transformation.
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