TSE20-400 RO Membrane Salt Rejection Rate – High Boron Removal Seawater Element

Product Introduction

As a professional manufacturer providing full-spectrum industrial water purification solutions centered on Liquid Filters, we supply dedicated seawater reverse osmosis membrane elements for coastal desalination plants, municipal island freshwater supply and offshore platform water production projects. TSE20-400 belongs to the premium TSE seawater RO series, engineered to deliver consistent, industry-leading RO membrane salt rejection rate alongside optimized boron removal performance, addressing the strict dual ion removal requirements of high-standard seawater desalination projects.

Conventional standard seawater RO membranes can achieve basic salt interception but deliver limited boron rejection, often requiring post-treatment to meet drinking water boron limits. TSE20-400 optimizes the density and hydrophilicity of its cross-linked polyamide separation layer to balance high salt rejection and improved boron retention, delivering measurable performance advantages for designers aiming to simplify downstream treatment infrastructure. Designed as a standard 8040 spiral wound RO membrane with 400 sq. ft active membrane area, all core metrics including RO membrane salt rejection rate and boron removal efficiency are verified via standardized high-pressure seawater testing. This universal RO membrane element matches all mainstream high-pressure seawater pressure vessels and supports direct replacement of legacy seawater membranes without full pipeline or high-pressure pump overhauls.

Working Principle Behind Salt Rejection & Optimized Boron Retention

Salt separation in seawater reverse osmosis relies on the solution-diffusion mechanism, rather than simple size-based screening seen in ultrafiltration and nanofiltration. Water molecules dissolve into the dense polyamide active layer and diffuse through to form permeate, while dissolved ionic salts are repelled at the membrane surface via the Donnan exclusion effect, delivering stable overall salt rejection.

Natural seawater primarily contains neutral boric acid molecules (H₃BO₃), which are barely affected by membrane surface charge. Instead of electrostatic capture, TSE20-400’s enhanced dense hydrophilic polyamide matrix restricts the diffusion of small neutral boron compounds through the membrane layer, slowing boron penetration to boost overall removal efficiency. For raw seawater with extremely high baseline boron concentration, a two-stage reverse osmosis layout is still recommended to reliably meet strict drinking water boron limits.

When high-pressure raw seawater flows through the element’s wide streamlined feed spacers, water molecules selectively pass through the separation layer, while saline compounds and most boron substances are concentrated and discharged as brine. The smooth hydrophilic membrane surface reduces adhesion of marine suspended solids, algae and organic colloids, slowing gradual performance decay under long-term continuous operation. Unlike generic industrial RO membrane that only prioritizes basic desalination, TSE20-400 is tailored to the high-salinity, boron-containing water quality characteristics of raw seawater.

Core Technical Data of Salt Rejection & Boron Removal

All figures below are certified test results collected under standardized reference conditions for TSE20-400, focused on the core RO membrane salt rejection rate and boron removal performance required for desalination project design:

• Full Model: TSE20-400 High Salt Rejection Optimized Boron Removal Seawater RO Membrane

• Structural Type: Standard 8040 spiral wound RO membrane for seawater service

• Nominal Active Membrane Area: 400 sq. ft

• Standard Reference Test Conditions: 25°C, 800 psi operating pressure, 32000 ppm NaCl simulated seawater

• Stabilized RO Membrane Salt Rejection Rate under Standard Test Conditions: ≥99.75%

• Certified Boron Removal Rate under Standard Test Conditions: ≥93%

• Rated Permeate Flow Rate (Standard Test): 8,600 – 9,900 GPD

• Continuous Operating Pressure Range: 650 – 900 psi

• Long-Term Operating pH Scope: 2.0 – 10.5

• Short-Term Chemical Cleaning pH Range: 1.0 – 12.5

• Maximum Allowable Feed Water SDI for Seawater: ≤4

• Single Element Pressure Drop: ≤16 psig

• Critical Performance Note: Permeate flow rate and salt rejection rate will shift with operating temperature. Flux declines roughly 3% per 1°C temperature drop; salt rejection will slightly decrease at elevated temperatures. Temperature correction factors shall be referenced for formal engineering design calculations.

• Application Reminder: The 93% boron removal rate is achieved under standard test water quality. For raw seawater with extremely high native boron content, secondary polishing or two-stage RO configuration is advised to consistently comply with international drinking water boron standards.

Complete datasheets include pressure resistance, temperature adaptability, marine fouling simulation and cleaning recovery test data, providing full parameter support for engineers designing seawater treatment systems.

Product Advantages Reflected in Salt Rejection and Boron Removal Data

Every core strength of TSE20-400 can be validated through its standardized RO membrane salt rejection rate and boron removal test metrics. Its certified ≥99.75% salt rejection under reference conditions ensures permeate salinity stays within specification for typical seawater sources, delivering consistent freshwater quality during steady operation. The membrane’s 93% boron removal efficiency reduces the sizing and load of downstream boron polishing equipment for most conventional coastal seawater intake, cutting auxiliary equipment investment and daily chemical consumption. The widened flow channel design mitigates organic and particulate fouling accumulation on the membrane surface, extending the interval between scheduled acid and alkali cleaning cycles and lowering routine labor and reagent costs.

The universal 8040 seawater membrane footprint enables straightforward retrofitting of older low-performance elements on existing desalination lines; after replacement, system salt rejection and boron removal performance will align with reference test benchmarks after minor operating pressure adjustments. When operated within recommended pretreatment SDI limits, controlled temperature ranges and standardized periodic cleaning protocols, the membrane maintains stable interception performance and extends overall RO membrane lifespan, delaying full membrane replacement cycles to reduce long-term project operating costs.

Application Fields

With stable high RO membrane salt rejection rate and improved boron retention as its core performance strengths, TSE20-400 is widely adopted in diverse seawater desalination projects with defined freshwater quality standards. It serves as the primary filtration component for medium and large coastal municipal desalination plantsprocessing conventional coastal seawater, lowering the capacity requirement of downstream boron treatment equipment to meet public drinking water specifications. Offshore island residential freshwater supply systems and marine platform process water units utilize this membrane to produce usable freshwater, with its balanced salt and boron removal performance helping minimize overall equipment footprint for compact modular desalination units. Coastal resort zones, marine aquaculture facilities and port service stations deploy TSE20-400 to build low-maintenance desalination systems with consistent year-round water quality stability. In industrial seawater desalination for power plant cooling and factory process water supply, engineering teams reference the full set of salt rejection, boron removal and temperature correction data to accurately calculate membrane quantity and high-pressure pump sizing, optimizing system layout while complying with local water quality and environmental regulations.

Quality Standards

Each batch of TSE20-400 seawater membrane elements undergoes full sampling high-pressure simulated seawater testing prior to shipment, with unique serial-numbered inspection reports recording complete RO membrane salt rejection rate, boron removal efficiency, flux and pressure resistance data. The full production workflow complies with ISO 9001 quality management systems; all wetted raw materials meet international drinking water safety criteria, and core interception indicators pass third-party seawater desalination performance certification. Complete technical datasheets with temperature correction curves, batch test records and material traceability documents are supplied alongside goods for engineering design reference, tender filing and factory acceptance audits. Finished membranes are vacuum-sealed with specialized anti-desiccation protective liquid to prevent separation layer damage during transit and storage, ensuring on-site installed performance closely matches official reference test values when operated within defined temperature and pretreatment limits.

Future Prospects

Coastal urban expansion and remote island resource development continue to drive steady market demand for high-performance seawater desalination membranes, with project stakeholders increasingly prioritizing elements that balance strong salt and boron removal to optimize downstream treatment footprint. Conventional generic seawater RO membranes deliver only basic desalination and require large post-treatment polishing systems, while fully customized ultra-high boron rejection seawater membranes carry significantly higher unit procurement costs, positioning TSE20-400 as a cost-effective mid-to-high performance solution for standard coastal desalination projects.

Our R&D team will continue refining the hydrophilic polyamide separation layer formula of TSE20-400 to further stabilize RO membrane salt rejection rate and elevate boron removal efficiency, alongside enhanced marine anti-fouling properties to extend consistent performance operating windows. Its ability to reduce downstream boron treatment sizing aligns with global trends toward compact, energy-efficient desalination infrastructure, supporting wider adoption in new coastal desalination plant construction and energy-saving retrofits of legacy seawater treatment stations.

Summary

TSE20-400 Seawater RO Membrane uses fully verified standardized RO membrane salt rejection rate test data as its core technical benchmark, developed to address the dual interception challenges of high salinity and neutral boron compounds present in raw seawater. Via a dense, hydrophilic optimized cross-linked polyamide separation layer and wide anti-fouling feed spacer design, it achieves high stable salt rejection and measurable boron retention, reducing the sizing burden of downstream boron polishing equipment for typical coastal seawater intakes.

Compared with generic standard seawater RO membrane products, TSE20-400 optimizes full-system auxiliary equipment configuration through its balanced dual interception performance, cutting long-term capital and operational expenditure for desalination projects when operated within recommended water quality and temperature boundaries. For seawater treatment design engineers, desalination equipment manufacturers and coastal water station operators seeking consistent salt and boron removal performance under standard seawater intake conditions, TSE20-400 delivers reliable long-term purification performance and complete standardized technical documentation for engineering design.

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