A water recycle-reuse system researched and developed by the Virginia Highway and Transportation Research Council for Treating water closet flush water was constructed at an existing rest area. An existing 10,000 gpd (37,800 lpd) biological wastewater treatment system and rest area piping system were modified to accommodate water reuse. The recycle-reuse system consisted of biological treatment (extended aeration) followed by gravity sedimentation and granular filtration. It was designed for 95% water reuse with 5% make-up from sewered potable uses such as wash basins. Operation of the biological and physical treatment units followed conventional guidelines. The biological system functioned satisfactorily at a low pH of from 5.5 to 6.5 and low alkalinity. The low pH and alkalinity resulted in complete nitrification and high ammonia nitrogen and nitrite nitrogen concentrations. Although high equilibrium nitrogen concentrations occurred, they were not detrimental to the process. Biological solids were filamentous but were satisfactorily separated from the flush water by gravity sedimentation. The system satisfactorily responded to seasonal variations in waste characteristics and water reuse imposed by the uses as well as seasonal climatic variations. Operation and maintenance requirements at the rest area site did not significantly increase as a result of the recycle-reuse system. Results from this study confirmed the conclusions of the evaluation study phase. The recycle-reuse system proved to be an acceptable and economical means of resolving water supply and water pollution problems at the rest areas. /FHWA/

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  • Supplemental Notes:
    • Sponsored by the Federal Highway Administration.
  • Corporate Authors:

    Virginia Highway and Transportation Research Council

    Charlottesville, VA  United States 
  • Authors:
    • Parker, C E
    • Reynolds, J W
  • Publication Date: 1979-4

Media Info

  • Features: Appendices;
  • Pagination: 33 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00196244
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • ISBN: HPR 1469
  • Report/Paper Numbers: FHWA-VA-79-R43 Final Rpt.
  • Contract Numbers: HPR 1469
  • Created Date: Sep 15 1979 12:00AM