A prototype non-aqueous wastewater treatment system utilizing recirculated mineral oil as a collection and transport media was installed and operated at the Mount Rushmore National Memorial, Rapid City, South Dakota. The project was conducted to demonstrate the feasibility and effectiveness of the non-aqueous system for application at recreational and similarly remote areas. The non-aqueous system was evaluated for six months during the 1972 visitation season. During this period, data was collected to determine system usage rate and user waste loading and to evaluate the physical, biological, and chemical content of the flush oil as a function of system usage. System operation and reliability were also demonstrated during the test period. The demonstration showed that the non-aqueous treatment system is effective in the collection, transport, and disposal of human waste. Odors in the oil flush media and from the treatment system presented an aesthetic problem which makes the use of this system undesirable for recreational areas such as Rushmore. System redesign to prevent organic accumulations and the routine use of an oxidizer-bactericide to eliminate odor-producing bacterial activity is required before this concept can be suitable for high-use visible recreational areas. Water conservation is achieved when recirculated mineral oil is used to collect and transport human wastes. The waste volume is reduced by 98 percent in comparison with conventional water carriage systems. This report was submitted in fulfillment of Project Number 15010 PBK under the partial sponsorship of the Environmental Protection Agency.

  • Availability:
  • Corporate Authors:

    Black Hills Conservancy Sub-District

    P.O. Box 1692
    Rapid City, SD  United States  57701
  • Authors:
    • Matthew, F L
    • Nesheim, E E
  • Publication Date: 1973-12

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: 130 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00099918
  • Record Type: Publication
  • ISBN: 1BB038
  • Report/Paper Numbers: EPA 670/2-73-088
  • Files: TRIS
  • Created Date: Oct 18 1975 12:00AM