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LEACHATE CLOGGING ASSESSMENT OF GEOTEXTILE AND SOIL LANDFILL FILTERS
Citation:
Koerner, R. AND G. Koerner. LEACHATE CLOGGING ASSESSMENT OF GEOTEXTILE AND SOIL LANDFILL FILTERS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/R-95/141.
Description:
This project was focused on the performance, design, testing and selection of filters used for leachate collection drains at the base of landfills, waste piles and other solid waste facilities. Geotextiles due to their manufactured uniformity, ease-of placement and savings in landfill volume were emphasized, although soil filters consisting of natural sand were also evaluated. ield exhuming of 4 sites indicated that problems existed at 3 of them. ll 3 cases were "socked pipe" where a geotextile was wrapped around perforated pipes. he testing and subsequent design showed that socked pipe designs should not be used by designers nor allowed by permitting agencies for this application. onversely, moving the geotextile away from the pipe, e.g. in a trench wrap configuration, gave acceptable performance at the fourth site. ven further, the laboratory testing portion of the study indicated that an open geotextile over the entire footprint of the solid waste facility is the proper design strategy and thus recommended for general use. he introduction of a term called the "drainage correction factor", i.e., DCF, in the standard design equation is recommended, This approach resulted in an assessment of the various design options and corroboration of the field findings. ther related investigations and findings that were undertaken include the "no filter" design strategy (which can be used only with extreme caution and accompanying long-term testing) and the use of biocides (which is not recommended).