SW 2521 RO Membrane

General Information

SW 2521 membrane is developed for small-capacity seawater treatment, offering high productivity with excellent salt rejection performance in SW RO systems..
SW 2521 RO membrane offers sustainable consistency, high rejection rate, low energy performance and lower lifecycle cost.

Features & Advantages

Stable salt rejection rate at high feed TDS
Higher permeate flow rate at lower operating fluxes
Lower operating cost through reduced energy consumption
Economical equivalent element for direct replacement

Applications

Seawater desalination
Minimal or zero liquid discharge
Landfill leachate sewage treatment
High-salinity wastewater concentration
Other applications with feed TDS above 10,000 ppm

Specifications

Configuration: Spiral wound element
Membrane Polymer: Polyamide thin-film composite

Performance

Element Model

Membrane Active Area

ft² (m²)

Feed Spacer

mil (mm)

Permeate Flow Rate^*

GPD (m³/d)

Stabilized Salt Rejection^**

Minimum Salt Rejection

Boron Rejection

TFSW-2521

14 (1.3)

28 (0.712)

250 (0.9)

99.7%

99.6%

92%

Standard test conditions:

The above performance is initial (data record after 30 minutes of operation), based on the following conditions:

32,000 ppm NaCl, 5 ppm H₃BO₃ solutionn

800 psi (55 bar) operating pressure

25°C (77°F) operating temperature

4% permeate recovery

7.5-8 pH range

*Permeate flow for individual elements may vary but will be no more than ±15%.

**Stabilized salt rejection is generally achieved within 24-48 hours of continuous use; depending on feed water characteristics and operating conditions.

Element Dimensions

Size	Length L inch (mm)	Diameter D inch (mm)	Permeate tube inner diameter d inch (mm)	Permeate tube Extension L1 inch (mm)
2521	21 (533)	2.4 (61)	0.75 (19)	1.19 (30.2)

Operating and Cleaning Limits

Maximum Operating Pressure	1,200 psi (83 bar)
Maximum Operating Temperature	45°C (113°F)
Maximum Chlorine Concentration	0.1 ppm
pH Range, Continuous	2-11
pH Range, Cleaning	1-13
Maximum Feed SDI (15 mins)	5
Maximum Element Pressure Drop	15 psi (1 bar)
Maximum Feed Flow	1.4 m³/h
Minimum Ratio of Concentrate to Permeate Flow for Each Element	5:1

The limits shown above are for SW2521 in general applications. For specific projects, operating at more conservative values may ensure the best performance and longest life of the membrane element.

Tanal