UF - Ultrafiltration

Dead-End Ultrafiltration
A dead-end Ultrafiltration is an excellent means for removing finest particles and suspensa from an effluent stream. It is most effective, has a small footprint and operates at very low costs. These characteristics make the dead-end Ultrafiltration the ideal pre-treatment for a Nanofiltration or a Reverse Osmosis. Thereby, the filtration units can be built at low costs using spiral-wound membrane modules. Additional benefits are the reduced operation costs of the filtration units and their enhanced performance.

Ultrafiltration (side-stream cross-flow type)
The ultrafiltration of a BIOMEMBRAT®-type MBR uses external membranes and is placed on skids beside the reactors.

This has the decisive advantages of

  • having a very small footprint

  • being easily extendable & upgrade

  • service and maintenance being very easy​

Ultrafiltration-LE (low energy type)
Any ultrafiltration of a BIOMEMBRAT®-type MBR uses external membranes and is placed on skids beside the reactors.

This has the decisive advantages of

  • having a very small footprint

  •  being easily extendable & upgradable

  •  service and maintenance are very easy.

The Ultrafiltration-LE has all the above listed advantages of a WEHRLE Ultrafiltration and has the additional advantage of saving 30-50 % of the energy uptake in the UF. To achieve this, new process steps have been added to the Ultrafiltration which enable the control of the boundary layer on the membrane surface and with it the flux over the membrane at reduced speed velocity in the UF modules.

Criteria

BIOMEMBRAT®
cross-flow

BIOMEMBRAT®-LE

Conventional (submerged) membranes

Energy consumption

high

low

low

Energy dynamic *)

none

flexibly adapts to the respective loads

none

Consumption of chemicals

low

high

high

Membrane lifetime

high

low

low

Manpower

very little

little

high

Cleaning process

very simple

simple

complex

Robustness

very high

high

very low

Flux (l/h*m²)

very high

high

very low

Throughput dynamic

medium

medium to high

none

Necessary surface for construction

small

medium

large

Investment costs

low

high

high

*) to save energy in case of less throughput

Within the range of the two above-mentioned processes, cross-flow and low-energy, WEHRLE offers tailor-made solutions for your task including dynamic energy consumption, i.e. your plant automatically adapts to throughputs < 100 %. Due to our experience gained from the construction of over 200 MBR plants, we are capable of developing solutions combining the advantages of both processes: guaranteeing high flux while at the same time saving energy and without having to use complex backflush systems.

Your advantages:

  • space-saving plants

  • simple extension & upgrade – flexibility and sustainability

  • energy dynamic: a sophisticated control system reduces the energy consumption in case of less throughput

  • simple upgrade of existing conventional biologies to MBRs