Reverse osmosis membrane Saehan RE4040-BLF (2500 GPD) brackish water (9.5 m3/day)

Characteristics:

• Productivity: 9.5 m3/day.

• Selectivity: 99.2%.

• Filter surface area: 7.9 m2.

• Pressure 14.8 atm.

1. Bench tests were carried out for 30 minutes. under the following conditions: 500 mg/l NaCl solution, pressure -100 psi (6.66 atm.), permeate content - 15%, water temperature 25 C and pH 6.5-7.0.
2. All items are stored in vacuum plastic packaging with 1% soda bisulfite solution and packed in cardboard boxes.

Description:

• Membrane type: Thin film composite.

• Membrane material: PA (Polyamide).

• Membrane surface charge: Negative.

• Construction: Roll membrane with FRP sheath (fiberglass).

Dimensions:

• Length: 1016 mm.

• Outer diameter: 102 mm.

• Outlet tube diameter: 19.1 mm.

Peculiarities:

• Low pressure CSM BLF diaphragms provide high performance even at very low pressures, helping to save energy and costs for high pressure pumps, plumbing and diaphragm pressure housings.
• The use of this type of membrane is justified when the TDS of the feed water is low enough and high quality permeate is not required.
Comparison of membrane characteristics

Comparison of low pressure CSM membranes under the condition of supplying the same water (TDS -500mg/l NaCl) and obtaining the same amount of permeate (25 l/m2-hour) at a temperature of 25 C.
General storage conditions for membranes:
• All elements must be stored in a dry place at room temperature to prevent freezing or overheating. In case of violation of the integrity of the polyethylene packaging, it is necessary to pour a new protective solution into the membrane and pack it hermetically to prevent the appearance of bacteria.
• After the start of use, all elements must always be in the water.
• The water produced during the first hour of operation must be drained to flush out the protective solution from the system components.
• All CSM elements must be stored in a protective solution during storage, transport, or shutdown of the system to prevent bacteria or freezing. The standard solution consists of a 1% soda bisulfate solution or a 1% soda metabisulfite solution (food grade). For a short-term system shutdown (no more than a week), a 1% solution of soda metabisulphite is sufficient to prevent the formation of bacteria.
• The customer is solely responsible for the use of chemicals that are incompatible with the elements. Their use will void the warranty on those items.

Characteristics ( operating limits) :

• Maximum pressure drop (element) 0.1 MPa.
• Maximum pressure drop (housing) 0.42 MPa.
• Maximum working pressure 4.14 MPa.
• Maximum feed water flow 4.09 m3/h.
• Minimum concentrate output 0.91 m3/hour.
• Maximum operating temperature 45 C.
• Operating pH 3.0-10.0.
• CIP pH value 2.0-11.0.
• Maximum turbidity 1 NTU.
• The maximum concentration of free chlorine is 0.1 mg/l.
• Maximum SDI 5.0 pollution allowed.

Characteristics when using different types of water:

• Wastewater (SDI <5) 8-12 gfd.
• Wastewater treated with UF (SDI <3) 10-14 gfd.
• Sea water (direct intake) (SDI <5) 7-10 gfd.
• Brackish well water (SDI <3) 8-12 gfd.
• Fresh water (SDI <5) 12-16 gfd.
• Fresh water (SDI <3) 13-17 gfd.
• Well water (SDI <3) 13-17 gfd.
• RO/UF permeate (SDI <1) 21-30 gfd.

Salt limits:

• CaSO 230%.
• SrSO 800%.
• BaSO 6000%.
• SiO 100%.

The values given are valid subject to the availability of scale inhibitors for the respective salts.

Potential for CaCO precipitation by LSI and SDSI.

• With sediment inhibitor <-0.2.
• LSI (SDSI) with SHMP <+0.5.
• LSI (SDSI) with special inhibitor <+1.5.
• SDSI with any inhibitor <+0.5.