RO and NF membranes are capable of separating substances
as small as ions and are typically rated by terms of percent salt rejection
and flow. The extent of the separation depends on the charge of the
particles.
UF and MF membranes reject larger molecules
on the basis of size, and are typically rated in terms of pore size, or
porosity.
In waste soluble oil treatment applications, where the filtered
treated water or `permeate' is being discharged to drain, tight pore membranes,
in the range of 0.005 microns, are selected for maximum oil and dirt retention.
In aqueous cleaner recycling applications where the objective
is water and cleaner reuse, larger pore membranes (0.05 to 0.3 microns)
are employed to insure maximum passage of cleaner while still rejecting
virtually all of the contaminants that degrade cleaner performance.
Since filtration is based on simple mechanical principles, it eliminates
the variability often associated with other wastewater processing techniques
such as chemical treatment.
By using a properly designed Eco Technology Limited "Ecomem"
membrane system, our users have the assurance that only the desired molecules
will pass through the membrane barriers, and through electronic controls
and automatic operation, operator input is minimised.
