Hydranautics ESPA2 MAX 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.

The ESPA2 MAX offers the same rejection characteristics as ESPA2 but with even higher flow rates. The growing family of ESPA RO membranes continue to meet the ever-increasing demands of the water treatment industry. Industrial users worldwide have made ESPA their first choice for high productivity and salt rejection.

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ESPA2 MAX Specifications:

Permeate Flow: 12,000 gpd (45.4 m³/d)
Salt Rejection: 99.6% (99.5% minimum)
Boron Rejection (Typical)@ pH=10: 93.0%
Configuration: Spiral Wound Membrane
Polymer: Composite Polyamide
Membrane Active Area: 440ft² (40.8m²)

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

1500 PPM NaCl solution
150 psi (1.05 MPa) Applied Pressure
77°F (25°C) Operating Temperature
15% Permeate Recovery
6.5 - 7.0 pH Range

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Standard Operating Limits:

Maximum Applied Pressure: 600 psig (4.16 MPa)
Maximum Chlorine Concentration: < 0.1 PPM
Maximum Operating Temperature: 113°F (45°C)
pH Range, Continuous (Cleaning): 2-10.6 (1-12)
Maximum Feedwater Turbidity: 1.0 NTU
Maximum Feedwater SDI (15 mins): 5.0
Maximum Feed Flow: 75 GPM (17.0 m³/h)
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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