Steady-state design of horizontal systems for liquids addition at bioreactor landfills |
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| Authors: | Pradeep Jain Timothy G Townsend Thabet M Tolaymat |
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| Institution: | 1. Innovative Waste Consulting Services, LLC, 6628 NW 9[th] Blvd. Suite 3, Gainesville, FL 32605, USA;2. Department of Environmental Engineering Sciences, University of Florida, P.O. Box 116450, Gainesville, FL 32611-6450, USA;3. National Risk Management Research Laboratory, Office of Research and Development, US Environmental Protection Agency, Cincinnati, OH 45268, USA;1. Key Laboratory of Coalbed Methane Resources & Reservoir Formation Processes, Ministry of Education, School of Resources and Earth Science, China University of Mining and Technology, Xuzhou 221008, China;2. North China Institute of Aerospace Engineering, Langfang 065000, China;1. University of Illinois at Chicago, Department of Civil & Materials Engineering, 842 West Taylor Street, Chicago, IL 60607, United States;2. Department of Civil Engineering, Indian Institute of Technology, Hyderabad, Telangana, India;1. Engineering & Consulting Services (ECS) Limited, 1050 N. Post Oak Rd., Suite 130, Houston, TX 77055, United States;2. Department of Civil Engineering, The University of Texas at Arlington, 417 Yates Street, NH 404, Arlington, TX 76019, United States;3. Solid Waste Operations, City of Denton, 1527 S. Mayhill Rd., Denton, TX 76208, United States;4. Department of Civil and Environmental Engineering, Jackson State University, 1400 J.R. Lynch Street, JSU Box 17068, Jackson, MS 39157, United States;1. Yuhangtang Road 866#, MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Institute of Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China;2. Chaowang Road 18#, Institute of Geotechnical Engineering, Zhejiang University of Technology, Hangzhou 310014, China;3. Wuyishan Road 341#, Qingdao Port Group Co., LTD, Qingdao 266011, China;1. Department of Civil and Environmental Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong;2. School of Science and Engineering, University of Dundee, Fulton Building, Nethergate, Dundee, Scotland DD1 4HN, UK |
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| Abstract: | The key parameters for designing a horizontal source (horizontal trenches, infiltration ponds, infiltration galleries or blankets) for steady state are the rate liquids can be added to the source, the lateral and vertical extents of the zone of impact of the source, and the liquids volume needed to wet the waste within the zone of impact at steady state. This paper presents charts that a designer can use to estimate these key parameters as functions of source dimensions, injection pressure, and municipal solid waste properties (porosity, hydraulic conductivity, and anisotropy) for designing a new or analyzing an existing horizontal source system for liquids addition to landfilled waste. SEEP/W was used to model liquids flow from a horizontal source in a range of conditions practically encountered for such systems. The governing equation (Richard’s equation) and the boundary conditions were analyzed to formulate dimensionless variables by normalizing the design parameters (flow rate, injection pressure, the lateral zone of impact, injection pressure, and the added liquids volume) with the waste properties and source dimensions. The simulation results were transformed to the respective dimensionless forms and presented in design charts to estimate the key design parameters as functions of the source dimensions, waste properties, and injection pressure. The presentation of the modeling results in the dimensionless form facilitates their use beyond the conditions modeled. A solved example is presented to demonstrate the use of the design charts. The approach presented in the paper should be considered as approximate and designers should use their judgement and experience when using these charts for designing a horizontal liquids addition system for a specific site. |
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