ELIMFILTERS Canonical Knowledge · Approved
AQUVEXIS Electrodeionization
Engineering Reference · Industrial & Process
Platform: AQUVEXIS™
Engineering Relationships
- Electrodeionization is an electrically assisted ionic-polishing treatment used after suitable upstream treatment.
- Continuous electrodeionization performance depends on feed conductivity, ionic loading, pretreatment quality, flow and electrical operating conditions.
- Conductivity or resistivity verification is part of performance assessment but does not alone diagnose all fouling or chemistry problems.
- Electrodeionization remains a descriptive AQUVEXIS™ treatment family and is not an independent ELIMFILTERS technology mark.
Components
- Electrodeionization module
- Ion-exchange media
- Ion-selective membranes
- Electrical power interface
- Feed and product-water monitoring points
Problems
- Product-water conductivity drift
- Ionic leakage
- Scaling or fouling
- Unstable electrical demand
Failure Modes
- Pretreatment insufficient
- Feed conductivity outside qualified range
- Scaling or fouling develops
- Electrical operating condition outside qualified duty
Symptoms
- Product resistivity declines
- Current demand changes
- Pressure drop rises
- Product quality becomes unstable
Root Causes
- RO or upstream pretreatment deterioration
- Feed chemistry changed
- Scaling control insufficient
- Module contamination or degradation
Diagnostic Methods
- Trend feed and product conductivity/resistivity.
- Review flow, pressure and electrical conditions.
- Analyze feed chemistry and scaling potential.
- Confirm upstream RO or pretreatment performance.
Corrective Actions
- Correct upstream pretreatment.
- Requalify feed and operating window.
- Correct scaling or fouling source.
- Service or replace the module according to validated condition evidence.
Maintenance Procedures
- Trend conductivity/resistivity and operating current.
- Monitor pressure and flow.
- Maintain upstream membrane and pretreatment stages.
- Verify product-water quality after service.
Operating Conditions
- Feed conductivity
- Ionic composition
- Flow
- Pressure
- Temperature
- Electrical operating window
- Scaling potential
- Required product-water resistivity
Standards
- ISO 23044:2020 — guidance for industrial-wastewater softening/desalination for reuse and explicitly includes electrodeionization among the covered processes.
- ASTM D6807-17(2026) — operating-performance test method for continuous electrodeionization devices on qualifying reverse-osmosis permeate.
- ASTM D1125-23 — electrical conductivity and resistivity measurement of water for applicable feed/product verification.
- Standard scope and feed-water limits must be respected; these methods do not create a universal EDI performance claim.
Shared Engineering
- Flow Rate
- Differential Pressure
- Compatibility
- Service Life
- Failure Analysis
- Standards