Hydranautics ESNA1-LF-LD Membrane

Product Description

ESNA1-LF are high performance nanofiltration membranes ideal for softening applications and the removal of pesticides, bacteria or viruses. They provide 50%-90% salt rejection with ultra-low-pressure operations, increased energy savings, and significantly lower installation and operating costs.

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ESNA1-LF Specifications

Permeate Flow: 8,200 gpd (31.0 m³/d)
CaCl₂ Rejection: 89%
CaCl₂ Rejection (minimum/maximum): 86%/95%

*Expected calcium rejection for a typical 500 ppm well water is 96% at 13 gfd operating flux and 25°C.

Configuration: Low Fouling Spiral Wound
Membrane Polymer: Composite Polyamide
Membrane Active Area: 400ft² (37.1m²)
Feed Spacer: 34 mil (0.864 mm) with biostatic agent

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

500 ppm CaCl₂
75psi (0.52 MPa) Applied Pressure
77°F (25°C) Operating Temperature
15% Permeate Recovery
6.5 – 7.0 Feed pH

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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 (17.0 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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