The results of this program have demonstrated the feasibility of an automatic and self-contained appliance that can recover and store usable hot water from waste laundry water, using essentially the same amount of energy as an equivalent-capacity water heater. It has been shown by extended evaluation tests with a waste stream of real laundry water that this unit is capable of recovering sterile hot water at a steady state rate of 22.7 liters/hour (6 gph) with a specific energy draw of 79 watt-hours/liter (299 watt-hours/gal), without the use of any expendable chemicals. It has also been shown by extended evaluation tests with a feed that simulates hospital wastewater preconcentrated by ultrafiltration and reverse osmosis that this unit can increase the solids concentration of a waste water from less than 2% to at least 29.3%. The results of a manufacturing cost analysis have shown that a conservative annual cost (that is, a maximum annual cost) of this appliance is $717 per year. Economic feasibility therefore is not demonstrable at present on a large scale. However, should water cost increase or the cost of the appliance decrease, a viable demand for household water recovery with the appliance would be possible.

  • Supplemental Notes:
    • Prepared in cooperation with National Aeronautics and Space Administration, Washington, D.C., Army Medical Research and Development Command, Washington, D.C., and Department of Housing and Urban Development, Washington, D.C.
  • Corporate Authors:

    CHEMTRIC, Incorporated

    Rosemont, IL  United States 

    Municipal Environmental Research Laboratory

    26 West St Clair
    Cincinnatic, OH  United States  45219
  • Authors:
    • Guarino, V J
    • Bambenek, R A
  • Publication Date: 1976-12

Media Info

  • Pagination: 106 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00158929
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: EPA/600/2-76/289
  • Contract Numbers: EPA-68-03-0436
  • Files: NTIS
  • Created Date: Aug 4 2002 12:00AM