Hydranautics ESPA4 LD Membrane

Product Description

ESPA4-LD is an excellent energy-saving polyamide membane. With minimized biofouling, minimized colloidal fouling and enhanced cleanability, the growing family of ESPA (Energy-Saving Polyamide) 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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Attributes of the ESPA4 LD:

Permeate Flow: 12,000 gpd (45.4m³)
Salt Rejection: 99.2% (99.0% minimum)
Configuration: Low Fouling Spiral Wound
Membrane Polymer: Composite Polyamide
Membrane Active Area: 400ft² (37.1m²)
Feed Spacer: 34mil (0.864mm) with biostatic agent

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

500 PPM NaCl solution
100 psi (0.7 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 (1-12)*
Maximum Feedwater Turbidity: 1.0 NTU>
Maximum Feedwater SDI (15 mins): 5.0
Maximum Feed Flow: 75 GPM (17.0m>³/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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