Dynaflow says that 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.
According to Dynaflow, DynaPerm is a cross-flow microfiltration concept, which utilizes microporous tubes. The micron range pore size and structure can be controlled during manufacturing. The tubes, made from a variety of thermoplastics, are rugged and chemically and biologically inert. The system can also use any other commercially available microporous tubes. DynaPerm increases the flux rate and therefore the economy of particle removal from the liquid. The system combines the features of cyclone separation, flow interruption and cross-flow filtration, which results in greatly increased flux rates for near complete removal of suspended particles down to the micron size. Both the microporous plastic tubes and complete systems are available.
Dynaflow adds that tests of particulate laden seawater conducted by Naval Facilities Engineering Service Center (NFESC) in California, USA, 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 seawater 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 hours of operation.
Dynaflow says that the DynaPerm system is particularly effective for the removal of heavy metals, for example copper, zinc and lead. Applications include stream and effluent treatment roles such as pre-treatment for suspended solids removal prior to reverse osmosis, carbon adsorption, or ion exchange. In addition, it is suitable for polishing - removal of fine suspended solids after chemical or biological treatment - as well as liquid reuse, when this is otherwise impeded by the presence of suspended solids. Other applications include in-plant processes, for valuable materials recovery, as well as heavy metals removal, when in suspended form. Treatment for discharge, dewatering, and biological treatment in combination with Dynaflow’s cavitating jet remediation system the DynaJets are also possible.
