Case study of landfill leachate recirculation using small-diameter vertical wells

    Authors

    P. Jain; J. H. Ko; D. Kumar; J. Powell; H. Kim; L. Maldonado; T. Townsend;D. R. Reinhart

    Comments

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    Abbreviated Journal Title

    Waste Manage.

    Keywords

    Bioreactor landfill; Leachate recirculation; Municipal waste; Vertical; wells; Well performance; Injection pressure; WASTE; PERFORMANCE; Engineering, Environmental; Environmental Sciences

    Abstract

    A case study of landfill liquids addition using small diameter (5 cm) vertical wells is reported. More than 25,000 m(3) of leachate was added via 134 vertical wells installed 3 m, 12 m, and 18 m deep over five years in a landfill in Florida, US. Liquids addition performance (flow rate per unit screen length per unit liquid head) ranged from 5.6 x 10(-8) to 3.6 x 10(-6) m(3) s(-1) per m screen length per m liquid head. The estimated radial hydraulic conductivity ranged from 3.5 x 10(-6) to 4.2 x 10(-4) m s(-1). The extent of lateral moisture movement ranged from 8 to 10 m based on the responses of moisture sensors installed around vertical well clusters, and surface seeps were found to limit the achievable liquids addition rates, despite the use of concrete collars under a pressurized liquids addition scenario. The average moisture content before (51 samples) and after (272 samples) the recirculation experiments were 23% (wet weight basis) and 45% (wet weight basis), respectively, and biochemical methane potential measurements of excavated waste indicated significant (p < 0.025) decomposition. (C) 2014 Elsevier Ltd. All rights reserved.

    Journal Title

    Waste Management

    Volume

    34

    Issue/Number

    11

    Publication Date

    1-1-2014

    Document Type

    Article

    Language

    English

    First Page

    2312

    Last Page

    2320

    WOS Identifier

    WOS:000343840800047

    ISSN

    0956-053X

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