BW30-400/34 Standard End Cap Brackish Water RO Membrane For Water Treatment

BW30-400/34 Standard End Cap Brackish Water RO Membrane For Water Treatment

BW30-400/34 standard end cap brackish water RO membrane is a hot-selling 8040 spiral wound reverse osmosis element, widely matched with BW30FR anti-fouling RO membrane, PROC10 industrial brackish water membrane and 5μm security filter cartridge for commercial water stations, factory water reuse and rural brackish water desalination. Equipped with 34mil wide feed spacer and high cross-link polyamide thin film composite layer, it stably maintains 99.5% nominal salt rejection under medium low operating pressure, with standard universal end cap design to lower system pressure drop and cut long-term maintenance cost. This mainstream brackish water RO element is highly favored by global water treatment contractors, used as core filtration media for all kinds of medium TDS raw water purification projects.

Product Description

BW30-400/34 standard end cap RO membrane belongs to classic 8-inch brackish water reverse osmosis series, strictly following international 8040 unified dimension standards, with effective membrane area reaching 400 sq.ft to balance large permeate flux and stable salt rejection. Users can collocate it with SWC5 seawater RO membrane, multi-media pre-filter and EDI ultra-pure water equipment to build two-stage desalination system for different raw water salinity scenarios. Unlike special customized RO elements with non-standard end caps, this model adopts general-purpose standard end cap structure, perfectly compatible with all universal 8-inch fiberglass and stainless steel membrane pressure vessels, O-rings and pipe fittings on the market. Adopting full-automatic hot winding production process, the integrated membrane body avoids interlayer separation and permeate leakage under long-term continuous pressure. The element is developed targeting underground brackish water, surface river water, factory secondary circulating water and municipal secondary biochemical effluent with medium-low pollution load, capable of 24h non-stop stable operation for commercial water dispensers and industrial water treatment skids, without obvious flux attenuation within long service cycle.

Working Principle

Pressure-driven reverse osmosis separation principle is the core working mechanism of BW30-400/34 brackish water RO membrane. Natural osmosis pushes water molecules to flow from low-purity concentrated water side to clean permeate side through semi-permeable polyamide membrane. When we apply external pressure higher than raw water osmotic pressure on the feed side of the RO element, the water flow direction reverses. Tiny pure water molecules penetrate dense composite membrane layer and converge into central permeate tube to form reusable clean water, while soluble salts, calcium magnesium scale ions, colloids, suspended solids and organic pollutants are intercepted on feed channel and discharged as concentrated wastewater. The built-in 34mil widened feed spacer generates strong turbulent flow on membrane surface, greatly relieve concentration polarization phenomenon, slow down pollutant sedimentation and realize uninterrupted stable water purification circulation for long-term water treatment operation.

Technical Features

1. 99.5% nominal high salt rejection performance

High cross-link aromatic polyamide composite membrane material endows BW30-400/34 stable 99.5% nominal salt rejection, minimum guaranteed rejection rate reaches 99.3%. It achieves excellent interception of hardness ions, sulfate, silica and trace heavy metals, maintaining steady permeate conductivity even when raw water TDS fluctuates within a certain range, fully satisfying industrial reuse and domestic drinking water standards.

2. 34mil wide anti-clog feed spacer design

Compared with conventional 28mil thin spacer brackish water RO membrane, the thickened widened 34mil flow channel enhances water turbulence intensity, lowers membrane surface pressure drop and weakens concentration polarization. Sludge, algae and organic sediment hardly accumulate on membrane surface, effectively prolong chemical cleaning cycle and upgrade overall anti-fouling performance of the whole water treatment system.

3. Universal interchangeable standard end cap structure

Integrated molding standard end cap removes matching barriers with mainstream 8-inch membrane housings and supporting fittings. Optimized flow equalization structure inside end cap offsets water hammer impact during equipment startup and shutdown, reduce risks of membrane element crack, pipeline leakage and unplanned system shutdown.

4. Wide pH range chemical cleaning tolerance

Continuous stable operation pH scope 2–11; short-term chemical cleaning acceptable pH range expands to 1–13. Compatible with citric acid pickling agent, sodium hydroxide alkaline detergent and sodium hypochlorite biocide, completely remove inorganic scale, organic filter cake and biological slime without damaging polyamide membrane separation layer.

5. 4.1MPa high pressure resistant integral winding craft

One-piece hot winding molding technology maximizes membrane layer compactness, maximum allowable operating pressure up to 4.1MPa (600PSIG). The firm membrane structure resists long-term continuous high pressure impact, avoid delamination and rupture failure, lift overall running stability of brackish water RO system.

Product Advantages

1. Medium low operating pressure cuts power consumption

BW30-400/34 runs stably under medium low pressure without oversize high-pressure booster pump, overall system power consumption reduces around 25% vs ordinary high-pressure brackish water RO membrane. Large-scale municipal and factory water reuse projects can achieve long-term obvious electricity cost savings.

2. Full universal size saves equipment renovation cost

Standard 8040 dimension plus standard end cap realize cross-brand direct replacement. Old water treatment skid transformation can replace outdated RO elements directly, no modification on pipelines, brackets and sealing components, save renovation labor and material expense greatly.

3. Long service life lower spare parts replacement frequency

Combination of anti-fouling 34mil spacer and wide pH cleaning tolerance slows irreversible membrane fouling accumulation. Under conventional municipal and factory water conditions, the service life of BW30-400/34 reaches 2–3 years, far longer than common thin spacer RO membrane, cut frequent spare parts procurement and production shutdown loss.

4. Strong anti-interference capacity guarantees stable permeate quality

This brackish water RO membrane owns strong adaptability to raw water temperature, turbidity and seasonal salinity fluctuation. Even raw water quality deteriorates in rainy season, permeate TDS and hardness index still meet standard, prevent production halt caused by unqualified outlet water.

5. Low full-cycle operation and maintenance cost

Extended chemical cleaning interval reduces chemical agent consumption and daily maintenance labor hours; low membrane element damage rate cut spare parts stock cost. Stable constant flux avoids excessive pump power waste, bringing comprehensive low-cost operation benefit for all medium and small water treatment systems.

Application Fields

1. Municipal tap water purification engineering

Process urban surface water and underground brackish water to remove excess hardness and soluble salts, adjust water quality to meet WHO domestic drinking water standards, widely used for municipal water supply plant upgrading and rural safe drinking water reconstruction projects.

2. Factory industrial water reuse system

Suitable for electronics, food & beverage, chemical, printing and dyeing industries, purify circulating cooling water and post-production wastewater. Treated clean permeate can be recycled for workshop cleaning and equipment cooling, effectively reduce factory fresh water intake volume.

3. Commercial centralized water supply equipment

Match large commercial water stations, campus water rooms and hospital water supply systems, continuously remove impurities and salt from raw water, provide long-term stable safe domestic water for public crowded commercial scenarios.

4. Boiler feed water & ultra-pure water pretreatment unit

Act as core pretreatment RO element for industrial boiler makeup water and electronic grade ultra-pure water production. It sharply lower influent conductivity, protect post-stage secondary RO membrane and EDI equipment, stabilize ultra-pure water output efficiency.

5. Rural high TDS brackish water desalination project

Specially designed for inland rural areas with high-hardness brackish underground water, conduct efficient desalination and purification to solve local poor domestic water quality problems, fit government rural water supply renovation bidding projects.

FAQs

Q1: Can BW30-400/34 standard end cap brackish water RO membrane directly replace other brands' 8040 RO elements?

A1: BW30-400/34 adopts standard 8040 outer dimension and universal standard end cap structure, fully compatible with all mainstream brands 8-inch membrane pressure vessels, O-rings and pipe fittings. It supports direct drop-in replacement without pipeline or pump modification, ideal for old water treatment equipment renovation.