Reduction of Indoor Air Pollution by Membrane Stripping of Waterborne Radon Gas

EPA Contract Number: 68D10069
Title: Reduction of Indoor Air Pollution by Membrane Stripping of Waterborne Radon Gas
Investigators: Matson, Stephen L.
Small Business: Arete Technologies
EPA Contact: Manager, SBIR Program
Phase: II
Project Period: September 1, 1991 through September 1, 1995
Project Amount: $149,951
RFA: Small Business Innovation Research (SBIR) - Phase II (1991) Recipients Lists
Research Category: Air Quality and Air Toxics , SBIR - Air Pollution , Small Business Innovation Research (SBIR)


Radon-222 in indoor air has been identified as a perva- sive pollutant and a significant health threat, and release of this volatile gas from water supplies containing elevated radon levels represents a significant source of exposure. The EPA will propose a stringent Maximum Contaminant Level for water-borne radon of 3OOpCi/L in mid-1991, consistent with the statement of agency personnel that water-borne radon may be responsible for more cancer deaths than all other drinking water contaminants com- bined.

In Phase I, Arete Technologies, Inc., established the technical and economic feasibility of using a gas/liquid contactor based on hollow-fiber membranes to strip radon from water with ambient air. The technology has significant benefits relative to the conventional approaches for water- borne radon mitigation, namely carbon adsorption and dif- fused-bubble or shallow-tray aeration.

In the Phase II program, Arete Technologies, Inc., seeks to further improve membrane, module, and system perfor- mance. Extended field tests will be conducted at multiple sites to assess potential operational issues, and a prototype membrane stripping system will be designed, constructed, and operated to remove water-borne radon from a house- hold water supply.

Supplemental Keywords:

RFA, Scientific Discipline, Air, Sustainable Industry/Business, Chemical Engineering, air toxics, Environmental Chemistry, Sustainable Environment, Chemistry, Technology for Sustainable Environment, Civil/Environmental Engineering, Civil Engineering, indoor air, Chemistry and Materials Science, Engineering, Engineering, Chemistry, & Physics, Environmental Engineering, Agricultural Engineering, waterborne radon gas , ambient air quality, emission control strategies, radon reduction, waterborne radon gas, membrane organic vapor recovery system, membrane technology , membranes, emissions control, radon, mitigation strategies, membrane stripping, radon mitigation, radon removal system, indoor air quality, membrane technology, atmospheric chemistry

Progress and Final Reports:

  • Final

  • SBIR Phase I:

    Reduction of Indoor Air Pollution by Membrane Stripping of Waterborne Radon Gas