AK HR Series

High Rejection Low Energy Brackish Water RO Elements


The A-Series proprietary thin-film reverse osmosis membrane elements are characterized by high flux and high sodium chloride rejection. AK HR low pressure brackish elements are selected when high rejection and low operating pressures are desired. These elements allow significant energy savings since good rejection is achieved at operating pressures as low as 100 psig (689 kPa).

These elements are recommended for low brackish water with salt concentration (TDS) levels up to 5,000mg/l. In turn, AK HR elements produce a permeate quality close to a standard brackish membrane element at a much lower pressure.

Table 1: Element Specification

Membrane Thin-film membrane (TFM*)

Model Average permeate flow gpd (m3/day)1,2 Average NaCl rejection1,2 Minimum NaCl rejection1,2
AK-90 2300 (8.7) 99.5% 99%
AK-365 10,000 (37.9) 99.5% 99%
AK-400 11,000 (41.6) 99.5% 99%
AK-440 12,000 (45.4) 99.5% 99%

1. Average salt rejection after 24 hours operation. Individual flow rate mayvary +/-20%.
2. Testing conditions: 500ppm NaCl solution at 115psi (793kPa) operating pressure, 77°F (25°C), pH7.5 and 15% recovery.

Model Active area ft2 (m2 ) Outer Wrap Part Number
AK-90 90 (8.4) Fiberglass 3056678
AK-365 365 (33.9) Fiberglass 3056679
AK-400 400 (37.2) Fiberglass 3056680
AK-440 440 (40.9) Fiberglass 3056681

 

AK HR Series

Figure 1a: Element Dimensions Diagram – Male

AK HR Series

Figure 1b: Element Dimensions Diagram – Female
Table 2: Operating and CIP parameters
Typical Operating Pressure 120 psi (830 kPa)
Typical Operating Flux 10-20GFD (15-35LMH)
Maximum Operating Pressure 400 psi (2,758 kPa)
Maximum Temperature Continuous operation: 122°F (50°C)
Clean-In-Place (CIP): 122°F (50°C)
pH range Optimum rejection pH: 7.0-7.5,
Continuous operation: 4.0-11.0,
Clean-In-Place (CIP): 1.0-13.01
Maximum Pressure Drop Over an element: 12 psi (83 kPa)
Per housing: 50 psi (345 kPa)
Chlorine Tolerance 1,000+ ppm-hours, dechlorination recommended
Feedwater2 NTU < 1
SDI < 5

 

1. Please refer to Cleaning Guidelines Technical Bulletin TB1194
2. SDI is measured on a non-linear scale using a 0.45 micron filter paper. Additionally, finer colloids, particulates and microorganisms that pass through the filter paper and not measured in the SDI test, will potentially foul the RO element. For performance consistency and project warranty, please use Winflows projection software and consult your GE representative.

Table 3: Dimensions and Weights
Model Type A B C Boxed Weight lbs (kg)
AK-90 Male 40.0 (101.6) 0.75 (1.90) 3.9 (9.9) 9 (4)
AK-365 Female 40.0 (101.6) 1.125 (2.86) 7.9 (20.1) 35 (16)
AK-400 Female 40.0 (101.6) 1.125 (2.86) 7.9 (20.1) 35 (16)
AK-440 Female 40.0 (101.6) 1.125 (2.86) 7.9 (20.1) 35 (16)