Elimination of Ground-Water Contamination by Septic-Tank Effluent

  • C. A. Rock
  • S. Irrinki
  • P. S. Pinkham
Conference paper
Part of the NATO ASI Series book series (volume 30)


In the laboratory, a sand-filled tank was used to represent a cross section of a soil-absorption trench. The top layer received half of the septic-tank effluent under aerobic conditions, while the remaining half directly entered the lower section. The lower section had a raised discharge to maintain anaerobic conditions. The unit removed more than 90% of nitrogen from the effluent, resulting in nitrogen concentrations consistently less than 10 mg/L. The results suggest that design modifications to conventional absorption trenches can achieve excellent nitrate removal without an external carbon source, mechanical additions, or other complexities.


Chemical Oxygen Demand Nitrogen Removal Biochemical Oxygen Demand Septic Tank Sand Filter 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag Berlin Heidelberg 1991

Authors and Affiliations

  • C. A. Rock
    • 1
  • S. Irrinki
    • 1
  • P. S. Pinkham
    • 1
  1. 1.Department of Civil EngineeringUniversity of MaineOronoUSA

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