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    Design and Performance of Septic Tanks

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    More than forty million people in the United States currently use onsite wastewater disposal or decentralized sewerage collection and treatment that rely on septic tanks for primary treatment. There is a good reason why, in this age of advanced technology, the septic tank is still in use. It works. More than 45% of ultimate treatment can be accomplished in the septic tank. Advanced onsite and effluent sewer technologies have established their environmental importance by bringing highly reliable, affordable and permanent wastewater treatment to users worldwide. In short, passive—energy free—septic tanks provide the most cost efficient form of primary treatment available for nonindustrial sewage.

    Decentralized sewers and onsite alternatives have advanced us to a new era of wastewater treatment and management where designers must be able to rely on the many essential components of the system. System components must be designed and constructed with the same permanency and quality expected of any long-term option. Because the septic tank is an essential ingredient to the success of these systems, a new generation of structurally-sound, watertight septic tanks is evolving.


    septic tanks, septage, structural adequacy, watertightness, biochemical, pumping interval, frequency, accumulation rates, retention time

    Author Information:

    Bounds, TR
    E.Vice President, Orenco Systems, Inc., Sutherlin, Oregon

    Committee/Subcommittee: D18.01

    DOI: 10.1520/STP13800S