DynaPERM enhanced particle filtration system


Source: Dynaflow, Inc.

DYNAFLOW, INC. is pleased to introduce the DYNAPERM® system for enhanced high flux rate filtration of particles from liquids. Laboratory experiments with the patented DYNAPERM® technology have produced flux rate increases of a factor of 50 over conventional cross flow filtration with comparable or improved effluent quality. Part of the development of this system was funded by a Small Business Innovative Research (SBIR) grant from the National Science Foundation.

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 thus economy of particle removal from liquid by combining features of cyclone separation, flow interruption and cross-flow filtration resulting 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.

Tests of particulate laden sea water conducted by Naval Facilities Engineering Service Center (NFESC) at Port Hueneme, CA, 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.

DYNAPERM® system is particularly effective for removal of heavy metals (e.g copper, zinc, lead, etc.). Table below shows results of containment removal from battery and electroplating waste after hydrogen peroxide precipitation. The very high quality of the filtrate (in parts per billion range for many contaminants) should be noted.

Applications include stream and effluent treatment roles such as:

• Pretreatment, for suspended solids removal prior to reverse osmosis, carbon adsorption, or ion exchange,

• Polishing, for removal of fine suspended solids after chemical or biological treatment,

• Liquid Reuse, when this is otherwise impeded by the presence of suspended solids,

• In-Plant Processes, for valuable materials recovery,

• 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®.

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