Alkalistab Series alkaline resistant nanofiltration membrane elements are designed for water and wastewater applications operating under high-pH conditions where conventional NF membranes rapidly degrade.
They provide stable separation performance and long service life in alkaline cleaning, process water reuse, and chemical wastewater treatment systems.
Alkalistab Series - Alkaline Resistant Nanofiltration Membrane Elements
The Alkalistab Series nanofiltration membranes utilize a chemically reinforced separation layer specifically engineered to withstand prolonged exposure to alkaline environments.
They are widely applied in industrial water treatment, alkaline wastewater reuse, and process water systems where stable separation and chemical durability are critical to system performance.
Manufactured under strict quality control, Alkalistab membranes are supplied to water treatment projects requiring reliable operation under high-pH conditions.
Key Features
Typical Applications
Process Media
• Sodium hydroxide (NaOH) solutions
• Potassium hydroxide (KOH) solutions
• Strong alkaline process streams and extreme alkaline media
Industries & Systems
• Chemical processing and alkaline stream treatment
• Surface finishing and alkaline cleaning processes
• Pulp and paper industry alkaline liquor treatment
• Industrial process recovery and recycling systems
• Environmental protection and resource recovery applications
Membrane Element Working Principle (NF)
Step 1 – Feed Water Inlet
Alkaline feed water enters the nanofiltration membrane under controlled pressure.
Step 2 – Membrane Separation
Multivalent ions and organic compounds are retained, while monovalent salts partially pass through the membrane.
Step 3 – Permeate Collection
Treated water is collected through the central permeate tube for reuse or discharge.
Step 4 – Concentrate Discharge
Concentrated alkaline streams are discharged for further treatment or management.
Step 5 – Continuous Operation
The system operates continuously with stable performance under high-pH conditions.
Technical Specifications
Product Dimensions
| Dimensions | in. (mm) |
| A | 40 (1016) |
| B | 7.9 (201) |
| C | 1.05 (26.7) |
| Model | A | B | C | D |
|
in. (mm) |
in. (mm) |
in. (mm) |
in. (mm) |
|
| 4040 |
40 (1016) |
3.9 (99.7) |
0.75 (19.1) |
1.05 (26.7) |
| 2540 |
40 (1016) |
2.4 (61) |
0.75 (19.1) |
1.19 (30.2) |
Product Parameters
The following performance data is based on standard testing conditions. Actual performance may vary depending on feed water quality and operating parameters.
| Model |
Permeate Flow |
Stable Rejection | Effective Membrane Area |
||
| GPD | m3/d | % | ft2 | m2 | |
| Alkalistab NF-8040 | 3600 | 13.6 | 97 | 350 | 32.6 |
| Alkalistab NF-4040 | 800 | 3.0 | 97 | 83 | 7.7 |
| Alkalistab NF-2540 | 190 | 0.72 | 97 | 24 | 2.2 |
| Testing Conditions | Operating pressure 110 psi (0.76 MPa) |
|
| Tested at 2000 mg/L MgSO₄ solution |
||
| Temperature at 25℃ |
||
| pH 7.0 ± 0.5 |
||
| Recovery rate at 15% |
||
| Operating Conditions & Limits |
Maximum operating pressure | 510 psi (3.5 MPa) |
| Maximum feedwater flow |
8040-75 gpm (17 m³/h) 4040-16 gpm (3.6 m³/h) 2540-6 gpm (1.4 m³/h) |
|
| Maximum temperature | 45℃ | |
| Maximum feedwater flow SDI15 | 5 | |
| Maximum concentration of free chlorine | <0.1 mg/L | |
| Maximum pressure drop per element | 15 psi (0.1MPa) | |
| Allowed pH range for chemical cleaning | 0-14 | |
| Allowed pH range for feedwater in operation | 0-14 | |
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