Case study of landfill leachate recirculation using small-diameter vertical wells |
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| Authors: | Pradeep Jain Jae Hac Ko Dinesh Kumar Jon Powell Hwidong Kim Lizmarie Maldonado Timothy Townsend Debra R Reinhart |
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| Institution: | 1. Innovative Waste Consulting Services, LLC, 6628 NW 9th Boulevard, Suite 3, Gainesville, FL 32605, USA;2. School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, China;3. Department of Environmental Engineering Sciences, University of Florida, P.O. BOX 116450, Gainesville, FL 32611-6450, USA;4. Engineering Department, Municipal Corporation of Delhi, 9th Floor, Dr. SPM Civic Centre, Jawahar Lal Nehru Marg, New Delhi 110 002, India;5. Environmental Science and Engineering, Gannon University, 109 University Square, Erie, PA 16541-0001, USA;6. Civil and Environmental Engineering Department, University of Central Florida, P.O. BOX 162450, Orlando, FL 32816, USA |
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| Abstract: | A case study of landfill liquids addition using small diameter (5 cm) vertical wells is reported. More than 25,000 m3 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 × 10?8 to 3.6 × 10?6 m3 s?1 per m screen length per m liquid head. The estimated radial hydraulic conductivity ranged from 3.5 × 10?6 to 4.2 × 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. |
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| Keywords: | Bioreactor landfill Leachate recirculation Municipal waste Vertical wells Well performance Injection pressure |
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