- 12 June 2007 -

Filtration system increases flux rates

Dynaflow, Inc has developed DynaPerm, a system designed for the enhanced high flux rate filtration of particles from liquids. Laboratory experiments with the DynaPerm technology have produced flux rate increases of a factor of 50 over conventional cross flow filtration with comparable or improved effluent quality, the company says.

DynaPerm involves cross-flow microfiltration, which utilizes thick-walled microporous plastic tubes. The micron range pore size and structure can be controlled during manufacturing, and the tubes, made from a variety of thermoplastics, are rugged and chemically and biologically inert. The system can increase the flux rate and improve particle removal from liquid by combining thefeatures of cyclone separation, flow interruption and cross-flow filtration - resulting in greatly increased flux rates for a nearly complete removal of suspended particles down to the micron size. The DynaPerm system can also be implemented with any other preferred microporous tubing.

When tested with particulate laden sea water, Dynaflow's system reportedly demonstrated the ability of this system to remove particulates to levels sufficient to feed to a reverse osmosis desalination system. Results of extended tests with sea water showed that the turbidity was reduced from an initial value of 2.1 NTU to a value of less than 0.1 NTU in the permeate with a decrease in silt density index from 38 (feed) to approximately 3 (permeate). Approximately 99% of the turbidity was removed even after 190 hr. of operation.

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