ELIMFILTERS Canonical Knowledge · Approved
MEMBRAVEX Membrane Separation
Engineering Reference · Industrial & Process
Platform: AQUVEXIS™
Technology: MEMBRAVEX™
Engineering Relationships
- MEMBRAVEX™ covers reverse-osmosis, ultrafiltration and nanofiltration treatment paths.
- Membrane selection follows feed-water analysis, target permeate condition, pressure, recovery, fouling and scaling potential.
- Pretreatment is part of membrane protection and cannot be separated from membrane performance assessment.
- RO/NF element test methods must not be represented as universal ultrafiltration standards.
Components
- Membrane element
- Pressure-vessel or module interface
- Pretreatment filtration
- Feed, permeate and concentrate sampling points
- Pressure and flow monitoring
Problems
- Permeate-quality deterioration
- Membrane fouling
- Scaling
- Loss of normalized flow or rejection
Failure Modes
- Pretreatment inadequate
- Membrane chemistry incompatible
- Scaling potential uncontrolled
- Element integrity or sealing defect
Symptoms
- Permeate conductivity rises
- Pressure demand rises
- Recovery declines
- Cleaning frequency increases
Root Causes
- Feed-water condition changed
- Fouling load increased
- Scaling control insufficient
- Oxidant or chemical exposure exceeded compatibility
Diagnostic Methods
- Characterize feed, permeate and concentrate.
- Normalize flow and quality against operating conditions where applicable.
- Review pressure, recovery and fouling trends.
- Inspect sealing and element integrity.
Corrective Actions
- Correct pretreatment or scaling control.
- Requalify membrane chemistry and operating envelope.
- Correct sealing or integrity defects.
- Verify post-service permeate performance.
Maintenance Procedures
- Trend normalized membrane performance.
- Maintain pretreatment.
- Monitor pressure, recovery and permeate quality.
- Apply validated cleaning and replacement criteria.
Operating Conditions
- Feed-water chemistry
- Temperature
- Pressure
- Recovery
- Fouling potential
- Scaling potential
- Required permeate quality
- Membrane material compatibility
Standards
- ISO 20468-5:2021 — membrane-filtration performance evaluation for water-reuse systems.
- ISO 25175:2026 — air-tightness, permeation and salt-rejection test methods for RO and NF membrane elements within its marine-technology scope; it does not cover UF.
- ISO 23044:2020 — industrial-wastewater softening/desalination guidance including NF and RO where reuse is the project context.
- ASTM D6908-25 — integrity testing of water-filtration membrane systems where that system test applies.
Shared Engineering
- Flow Rate
- Differential Pressure
- Compatibility
- Service Life
- Failure Analysis
- Standards