Hydranautics ESPA-2521 Membrane

Product Description

ESPA® (Energy Saving Polyamide) elements achieve high flux/lower pressure without compromising standards for high rejection. Since its introduction in the late 1990s, the ESPA® membrane has gained wide acceptance in the water treatment industry due to the significant operational cost savings associated with their use. 4” and 8” configurations available.

For consistently high performance and long life, go with the ESPA 2521. Industrial users worldwide have made ESPA their first choice for high productivity and salt rejection. The growing family of ESPA RO membranes continue to meet the ever-increasing demands of the water treatment industry. There's an ESPA solution to satisfy even the most challenging water treatment needs with exceptional performance, productivity and savings. ESPA is the world's leading high productivity, energy-saving polyamide membrane.

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ESPA-2521 Specifications:

Permeate Flow: 350 gpd (1.3 m³)
Salt Rejection: 99.4% (98.0% minimum)
Configuration: Spiral Wound
Membrane Polymer: Composite Polyamide
Membrane Active Area: 9.9 ft²

Elements are wet tested for quality assurance using the following conditions:

1500 PPM NaCl solution
150 psi (1.03 MPa) Applied Pressure
77°F (25°C) Operating Temperature
10% Permeate Recovery
6.5 – 7.0 pH Range
(Data taken after 30 minutes of operation)

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Standard Operating Limits:

Maximum Applied Pressure: 300 psig (2.1 MPa)
Maximum Chlorine Concentration: < 0.1 PPM
Maximum Operating Temperature: 113° F (45°C)
pH Range; Continuous (Cleaning): 3.0 –10.0*
Maximum Feedwater Turbidity: 1.0 NTU
Maximum Feedwater SDI (15 mins): 4.0
Maximum Feed Flow: 6 GPM (23 l/m)
Minimum Ratio of Concentrate to Permeate Flow for any element: 5:1>
Maximum Pressure Drop for Each Element: 10 psi

The limitations shown here are for general use. For specific projects, operating at more conservative values may ensure the best performance and longest life of the membrane. See Hydranautics Technical Bulletins for more detail on operation limits, cleaning pH, and cleaning temperatures.

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