Membrane location and filtration direction are separate choices
A submerged MBR places membranes in mixed liquor, either inside the biological reactor or in a connected membrane tank. An external MBR locates its modules in an outside circuit that receives mixed liquor and returns the retentate. Both arrangements combine biological treatment with membrane separation of biomass.
External does not, by itself, specify module geometry or filtration direction. UltraFlux™ operates outside-in, from the outside of the fibre into its lumen. When comparing proposals, identify the module, feed, recirculation arrangement and cleaning system. Data for an inside-out tubular membrane do not automatically describe an UltraFlux™ installation. This distinction keeps the comparison focused on the equipment actually being offered.
Compare complete layouts on the actual site plan
External equipment becomes particularly relevant when a tank is buried, covered or difficult to access. Pipe connections can bring filtration to an available service area. Submerged membranes in a dedicated tank are another option, so compare complete arrangements, including civil works, auxiliaries and maintenance space. An accessible layout should show how staff isolate equipment and remove components when needed.
| Criterion | External MBR | Submerged MBR |
|---|---|---|
| Location | Modules in an external circuit | Membranes in the reactor or a dedicated tank |
| Existing reactor | Mixed-liquor feed and return connections | Internal space or connection to another tank |
| Access | Service area and equipment isolation | Tank access and intervention equipment |
| Cleaning | Circuit and drains provided at the skid | Sequence and facilities depend on layout |
| Expansion | Reserved floor area, utilities and headers | Reserved capacity and tank space |
| Energy | Pumping and auxiliaries of the specific design | Filtration, membrane scour air and auxiliaries |
A useful cost comparison starts with the same duty
Specify the same net water output, water quality and availability for each proposal. Include the effect of washing and cleaning, the trains remaining in service during maintenance and any buffer storage. This establishes a basis for comparing membrane area and equipment size against the water actually delivered to the next process.
For capital cost, include equipment, connections, power supply, automation, civil works and access. For operating cost, include filtration and recirculation energy, aeration within the agreed comparison boundary, chemicals, cleaning waste and replacement. Relate expenditure to useful water production. A module-only energy figure is a different boundary from a whole treatment plant and cannot establish which configuration costs less at a particular site.
When UltraFlux™ deserves a place on the shortlist
Consider UltraFlux™ when retaining the existing biological tank and making membrane equipment accessible are project priorities. It is also relevant when the aim is to separate treated-water withdrawal from clarifier behaviour or establish a phased improvement in effluent quality. A productive first step is to place the external circuit on a site plan and review its connection to the process.
Neptuno develops the UltraFlux™ equipment and auxiliary scope around the feed and operating data. The customer's engineering team develops biological adaptation, aeration and overall plant integration. Bring together drawings, flows, mixed-liquor analysis, water-quality objectives and the available installation window. These inputs allow a choice between practical proposals matched to the industrial facility.