BW30-400/36i high flow brackish water RO membrane is an upgraded 8-inch spiral-wound reverse osmosis element optimized for high-yield industrial water treatment, commonly paired with BW30-400/34i standard RO membrane and FR anti-fouling RO membrane to build high-efficiency water reuse systems. Featuring a unique 36mil thick widened feed spacer and advanced low-fouling polyamide membrane formula, it delivers stable high flux and 99.5% nominal salt rejection under standard operating conditions. This i-series improved membrane reduces system pressure drop and flow channel blockage risks, adapts to high-yield continuous operation scenarios, and serves as the preferred high-flow core filter element for large-scale industrial and municipal water purification projects worldwide.
BW30-400/36i High Flow Brackish Water RO Membrane
BW30-400/36i high flow brackish water RO membrane is an upgraded 8-inch spiral-wound reverse osmosis element optimized for high-yield industrial water treatment, commonly paired with BW30-400/34i standard RO membrane and FR anti-fouling RO membrane to build high-efficiency water reuse systems. Featuring a unique 36mil thick widened feed spacer and advanced low-fouling polyamide membrane formula, it delivers stable high flux and 99.5% nominal salt rejection under standard operating conditions. This i-series improved membrane reduces system pressure drop and flow channel blockage risks, adapts to high-yield continuous operation scenarios, and serves as the preferred high-flow core filter element for large-scale industrial and municipal water purification projects worldwide.
Product Description
BW30-400/36i brackish water RO membrane belongs to the upgraded i-series high-flow RO element lineup, complying with international 8040 universal specifications and designed specifically for large-capacity brackish water desalination and industrial water reuse scenarios. It owns an effective membrane area of 400 sq.ft, achieving higher single-element water yield than conventional 34mil spacer RO membranes, and can form a complete multi-stage purification system with PROC10 industrial filter cartridge and secondary RO polishing equipment. Different from ordinary standard membrane elements, the 36mil ultra-wide feed channel greatly improves raw water passing capacity, making it more suitable for high-flow system operation. Adopting integral hot winding technology and optimized reinforced end cap structure, the membrane body features high pressure resistance and structural stability, avoiding delamination and leakage during long-term 24-hour continuous operation. It is widely applicable to medium-TDS underground brackish water, surface water, industrial circulating water and municipal reclaimed water, solving the low-yield pain points of traditional RO membranes in large-scale water treatment projects.
Working Principle
The core working mechanism of BW30-400/36i high-flow RO membrane is pressure-driven reverse osmosis separation technology. Under natural osmotic pressure difference, water molecules migrate from low-purity water side to clean water side. When external pressure higher than raw water osmotic pressure is applied to the feed side of the membrane element, the water flow direction reverses. Tiny water molecules pass through the dense polyamide semi-permeable membrane layer and converge into the central permeate pipe to form reusable clean water. Impurities including soluble salts, calcium and magnesium scale, colloids, suspended solids and organic pollutants are fully intercepted on the feed water side and discharged in the form of concentrated water. The exclusive 36mil widened feed spacer forms intense turbulent flow on the membrane surface, eliminates dead water zones, reduces concentration polarization, and ensures continuous and efficient water purification separation under high-flow operating conditions.
Technical Features
1. 36mil Ultra-wide Anti-clog Feed Spacer
Adopting upgraded 36mil thickened widened flow channel, the flow passage space is significantly larger than traditional 34mil spacer membranes. It effectively reduces system pressure drop, improves raw water circulation efficiency, avoids sludge and organic matter accumulation, and greatly extends the chemical cleaning cycle of high-flow water treatment systems.
2. 99.5% Stable High Salt Rejection
The high-crosslink modified polyamide membrane layer achieves a nominal salt rejection rate of 99.5% and a minimum guaranteed rejection rate of 99.3%. It stably intercepts hardness ions, sulfate, silica and trace heavy metals, ensuring consistent effluent water quality even with seasonal raw water salinity fluctuations.
3. High-yield Optimized Membrane Structure
The 400 sq.ft large effective membrane area matches the widened flow channel design, maximizing single-element water production efficiency. The reinforced integral winding structure enhances overall structural toughness, effectively resisting membrane deformation and damage under long-term high-flow and high-pressure operation.
4. Wide-range Chemical Tolerance Performance
It supports continuous stable operation in a pH range of 2–11, and tolerates short-term chemical cleaning in a pH range of 1–13. It adapts to various acid, alkali and biocide cleaning agents, thoroughly removing inorganic scale and biofilm without damaging the membrane separation layer.
5. Universal Reinforced Standard End Cap
The upgraded reinforced standard end cap improves pressure resistance and impact resistance, effectively resisting water hammer damage during frequent equipment start-stop. It is fully compatible with mainstream 8-inch membrane pressure vessels and accessories on the market, realizing plug-and-play replacement.
Product Advantages
1. Higher Water Yield to Improve System Efficiency
Compared with conventional 34mil spacer RO membranes, BW30-400/36i has a 10–15% higher single-element water flux. It reduces the number of membrane elements required for large-scale water treatment systems, saving equipment installation space and overall project investment costs.
2. Low Pressure Drop Reduces Operating Energy Consumption
The 36mil ultra-wide flow channel optimizes water flow status, effectively lowering system operating pressure drop. It reduces booster pump load and power consumption, bringing significant energy-saving benefits for long-term continuous operating large water plants.
3. Strong Anti-fouling & Long Maintenance Cycle
The widened turbulence flow channel inhibits pollutant deposition and biofilm growth, with a longer chemical cleaning cycle than ordinary RO membranes. It reduces the frequency of chemical maintenance and manual operation costs, improving system continuous operation stability.
4. Zero Modification for Universal Replacement
Adopting international standard 8040 size and universal end cap structure, it supports cross-brand direct replacement of old 8-inch RO elements. No pipeline or accessory modification is required for equipment renovation, greatly reducing upgrade costs and construction cycle.
5. Long Service Life & Low Comprehensive Cost
Optimized anti-fouling structure and excellent chemical cleaning resistance slow down irreversible membrane pollution. The actual service life reaches 2–3 years in industrial and municipal water environments, reducing spare parts replacement frequency and long-term system operation costs.
Application Fields
1. Large Municipal Water Purification Plants
Suitable for large-scale urban surface water and brackish water desalination treatment, stably reducing water hardness and TDS. The qualified effluent can be used for municipal domestic water supply and urban greening water replenishment, meeting large-volume urban water demand.
2. Industrial High-flow Water Reuse Projects
Widely applied in chemical, electronics, textile and food industries, used for purification and reuse of factory circulating cooling water and production wastewater. It improves industrial water reuse rate and reduces enterprise fresh water intake cost.
3. Commercial Centralized Water Supply System
Applied to large community water stations, industrial park centralized water supply and campus water treatment systems, realizing long-term stable high-yield water supply for public commercial scenarios.
4. Ultra-pure Water Pre-treatment System
As the core primary filtration element for electronic and pharmaceutical ultra-pure water preparation, it effectively reduces raw water salinity and impurities, reducing treatment pressure of subsequent secondary RO and EDI equipment.
5. Rural Large-scale Brackish Water Desalination Project
Targeted at inland rural high-TDS brackish water, it realizes high-efficiency and high-yield desalination purification, solving the problem of insufficient water supply and poor water quality in rural areas.
FAQs
Q1: What is the core advantage of BW30-400/36i compared with traditional 34mil spacer RO membranes?
A1: The BW30-400/36i adopts an upgraded36mil ultra-wide feed spacer, which increases water flux by 10–15%, reduces system pressure drop significantly, and features better anti-clog performance. It is more suitable for large-scale high-flow water treatment systems with higher operating efficiency and lower energy consumption.
Q2: Is BW30-400/36i compatible with standard 8-inch water treatment equipment?
A2: Yes. BW30-400/36i follows international 8040 standard size and universal reinforced end cap design, fully compatible with all mainstream 8-inch membrane pressure vessels, O-rings and pipe fittings. It supports direct drop-in replacement without any equipment modification.
Q3: How long is the chemical cleaning cycle of BW30-400/36i in long-term high-flow operation?
A3: Under conventional industrial and municipal raw water conditions, the routine chemical cleaning cycle of BW30-400/36i is 6–8 months. The 36mil widened flow channel effectively slows down pollutant accumulation, extending the maintenance cycle compared with ordinary RO membranes and reducing daily operating costs.
Q4: What are the allowable cleaning agents and cleaning pH range for BW30-400/36i?
A4: BW30-400/36i supports citric acid pickling, sodium hydroxide alkaline cleaning and sodium hypochlorite sterilization cleaning. The allowable cleaning pH range is 1–13, with acid concentration ≤3% and alkali concentration ≤5%. Single soaking cleaning time should not exceed 2 hours to protect the polyamide membrane structure.
Q5: What is the service life of BW30-400/36i in industrial water reuse working conditions?
A5: Under standard industrial circulating water and municipal reclaimed water conditions, the effective service life of BW30-400/36i reaches 2–3 years. Its excellent anti-fouling performance and chemical tolerance avoid rapid performance attenuation, ensuring long-term stable high-flow water production.
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