STP1324: Long-Term Effluent Absorption Rates of a Serially Loaded Septic Tank Filter Field

    Owens, PR
    Research Specialist, University of Arkansas, Fayetteville, AR

    Rutledge, EM
    Professors, University of Arkansas, Fayetteville, AR

    Roark, C
    Conservationist, Natural Resources Conservation Service, Morrilton, AR

    Gross, M
    Associate Professor, University of Arkansas, Fayetteville, AR

    Wolf, D
    Professors, University of Arkansas, Fayetteville, AR

    McNew, R
    Professor, University of Arkansas, Fayetteville, AR

    Pages: 9    Published: Jan 1997


    Abstract

    The objectives of this research were to determine the hydraulic performance of a serially loaded filter field with time, and to test the hypothesis that upper trenches of serially loaded filter fields build crusts until they transmit little or no effluent. This study was conducted for 8 years on a serially loaded filter field with an average effluent load of about 1125 L d-1. The mean summer effluent absorption rates (EARs) declined from 11.8 cm d-1 in year 1 to near stable EARs of 3.33 to 2.97 cm d-1 in years 5 through 8, thus indicating that progressive hydraulic failure in the soil did not continue or became negligible. Failure did occur, due to the design of the true serial system, in the form of blockage in the pipes of the upper trenches.

    Keywords:

    septic systems, serial septic system, crust, biomat, loading rate


    Paper ID: STP13788S

    Committee/Subcommittee: D18.01

    DOI: 10.1520/STP13788S


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