title: Transient design of landfill liquid addition systems.
abstract: This study presents the development of design charts that can be used to estimate lateral and vertical spacing of liquids addition devices (e.g., vertical well, horizontal trenches) and the operating duration needed for transient operating conditions (conditions until steady-state operating conditions are achieved). These design charts should be used in conjunction with steady-state design charts published earlier by Jain et al. (2010a, 2010b). The data suggest that the liquids addition system operating time can be significantly reduced by utilizing moderately closer spacing between liquids addition devices than the spacing needed for steady-state conditions. These design charts can be used by designers to readily estimate achievable flow rate and lateral and vertical extents of the zone of impact from liquid addition devices, and analyze the sensitivity of various input variables (e.g., hydraulic conductivity, anisotropy, well radius, screen length) to the design. The applicability of the design charts, which are developed based on simulations of a continuously operated system, was also evaluated for the design of a system that would be operated intermittently (e.g., systems only operated during facility operating hours). The design charts somewhat underestimates the flow rate achieved and overestimates the lateral extent of the zone of impact over an operating duration for an intermittently operated system. The associated estimation errors would be smaller than the margin of errors associated with measurement of other key design inputs such as waste properties (e.g., hydraulic conductivity) and wider variation of these properties at a given site due to heterogeneous nature of waste.
authors: Innovative Waste Consulting Services, LLC, 6628 NW 9th Blvd. Suite 3, Gainesville, FL 32605, USA. Electronic address: pjain@iwcs.biz.
authors: Pradeep
authors: P
authors: Jain
authors: Department of Environmental Engineering Sciences, University of Florida, P.O. Box 116450, Gainesville, FL 32611-6450, USA. Electronic address: ttown@ufl.edu.
authors: Timothy G
authors: TG
authors: Townsend
authors: United States Department of Environmental Protection, National Risk Management Research Laboratory, 26 W. Martin Luther King St., Cincinnati, OH 45268, USA. Electronic address: tolaymat.thabet@epa.gov.
authors: Thabet M
authors: TM
authors: Tolaymat
mesh_terms: D000465:Algorithms; D019149:Bioreactors; D018505:Waste Management
keywords: Bioreactor landfill; Horizontal trench; Leachate recirculation; Liquids addition; Vertical well