Evaluation of Landfill Cover Design Options for Waste Disposal Sites in the Coastal Regions of Ghana
Keywords:leachate, groundwater, landfill cover, waste disposal, Ghana, HELP Model
AbstractUncontrolled leachate generation from operational and closed waste disposal sites is a major environmental concern in the coastal regions of Ghana which have abundant surface water and groundwater resources. The Ghana Landfill Guidelines requires the provision of a final cover or capping system as part of a final closure plan for waste disposal sites in the country as a means of minimizing the harmful environmental effects of these emissions. However, this technical manual does not provide explicit guidance on the material types or configuration for landfill covers that would be suitable for the different climatic conditions in the country. Four landfill cover options which are based on the USEPA RCRA-type and evapotranspirative landfill cover design specifications were evaluated with the aid of the HELP computer program to determine their suitability for waste disposal sites located in the Western, Central and Greater Accra regions. The RCRA Subtitle C cover which yielded flux rates of less than 0.001 mm/yr was found to be suitable for the specific climatic conditions. The RCRA Subtitle D cover was determined to be unsuitable due to the production of very large flux rates in excess of 200 mm/yr. The results for the anisotropic barrier and capillary barrier covers were inconclusive. Recommendations for further study include a longer simulation period as well the study of the combined effects of different topsoil vegetative conditions and evaporative zone depths on the landfill water balance. The use of other water balance models such as EPIC, HYDRUS-2D and UNSAT-H for the evaluation of the evapotranspirative landfill cover design options should also be considered.
P. Rushbrook and M. Pugh, “Solid waste landfills in low and middle income countries: A technical guide to planning, design and operation,” World Bank Technical Publication 426, World Bank, 1999.
Ireland EPA, “Landfill site design,” Ireland Environmental Protection Agency, http://www.epa.ie, Dec. 7, 2013.
WSDOE, “Solid waste landfill design manual,” Washington State Department of Ecology, Publication no. 87-13, http://www.access.wa.gov, July 12, 2013.
D. Denutsui, T.T. Akiti, S. Osae, A.O. Tutu, S. Blankson-Arthur, J.E. Ayivor, F.N. Adu-Kwame and C. Egbi, “Leachate characterization and assessment of unsaturated zone pollution near municipal solid waste landfill site at Oblogo, Accra-Ghana,” Research Journal of Environmental and Earth Sciences, vol. 4, no. 1, pp. 134-141, 2012.
J. Osei, S.K. Osae, J.R. Fianko, D. Adomako, C. Laar, A.K. Anim, S.Y. Ganyaglo, M. Nyarku and E.S. Nyarko, “The impact of Oblogo landfill site in Accra-Ghana on the surrounding environment,” Research Journal of Environmental and Earth Sciences, vol. 3, no. 6, pp. 633-636, 2011.
D.K. Essumang, C.K. Adokoh, J. Afriyie and E. Mensah, “Source assessment and analysis of polycyclic aromatic hydrocarbon (PAH’s) at the Oblogo waste disposal sites and some water bodies in and around the Accra Metropolis of Ghana,” Journal of Water Resource and Protection, vol. 1, pp. 456-468, 2009.
Ghana Environmental Protection Agency, “Ghana landfill guidelines,” 2002.
Ghana Hydro-Database, “Greater Accra Region climate,” Fact Sheet No. CLM-FF-GAR, http://www.ghanahydrodata.com, Jan. 31, 2014.
Ghana Hydro-Database, “Central Region climate,” Fact Sheet No. CLM-FF-CNR, http://www.ghanahydrodata.com, Jan. 31, 2014.
Ghana Hydro-Database, “Western Region climate,” Fact Sheet No. CLM-FF-WER, http://www.ghanahydrodata.com, Jan. 31, 2014.
E. Oboubie and B. Barry, “Ghana Country Status on Groundwater”, http://www.iwmi.cgiar.org/publications/, Dec. 15, 2013.
P.R. Schroeder, C.M. Lloyd, N.M. Aziz and P.A. Zappi, “HELP Model User’s Guide for Version 3,” http://www.el.erdc.usace.army.mil/products/cfm, Dec. 15, 2013.
P.R. Schroeder, T.S. Dozier, P.A. Zappi, B.M. McEnroe, J.W. Sjostrom and R.L. Peyton, “HELP Model Engineering Documentation for Version 3,” http://www.el.erdc.usace.army.mil/products/cfm, Dec. 15, 2013.
USEPA, “Design and construction of RCRA/CERCLA final covers,” US Environmental Protection Agency, Office of Solid Waste and Emergency, EPA/625/4-91/025, 1991.
USEPA, “Evapotranspiration landfill cover systems fact sheet,” US Environmental Protection Agency, Office of Solid Waste and Emergency, EPA 542-F-03-015, 2003.
W.H. Albright, G.W. Gee, G.V. Wilson and M.J. Fayer, “Alternative cover assessment project,” Phase 1 Report, Final technical report prepared by Desert Research Institute for U.S. Environmental Protection Agency, Publication no. 41183, 2002.
S.F. Dwyer, “Water balance measurements and computer simulations of landfill covers,” Phd Thesis, The University of Mexico, Albuquerque, New Mexico, 2003.
Accra Metropolitan Assembly, “Rehabilitation, closure, bid evaluation, construction supervision and contract management of the Oblogo No.1 and Mallam No.1 dumpsites in Accra,” Draft Design Report, 2011.
USDoE, “Alternative landfill cover,” Innovative Technology Summary Report, U.S. Department of Energy, Office of Environmental Management/ Office of Science and Technology, http://ost.em.doe.gov, Dec. 7, 2013.
USEPA, “Case studies on ground water and surface water contamination from municipal solid waste landfills,” US Environmental Protection Agency, Office of Solid Waste and Emergency, EPA/530-SW-88-040, 1998.
K. Berger, “Validation of the Hydraulic Evaluation of Landfill Performance (HELP) model for simulating the water balance of cover systems,” Environmental Geology, vol. 39, no.11, pp. 1261-1274, 2000.
B.A. Gross, “Water balance evaluations for monitored evapotranspirative cover systems at three sites in the semi-arid and arid southwest U.S.A.,” Phd Thesis, University of Texas at Austin, Texas, 2005.
V.L. Hauser, D.M. Gimon, J.V. Bota, T.A. Howell, R.W. Malone and J.R. Williams, “Models for hydrologic design of evapotranspiration landfill covers,” http://pubs.acs.org/cgi-bin/art.PDF, Dec. 8, 2013.
A.N. Sharpley and J.R. Williams, “EPIC - Erosion/Productivity Impact Calculator: Model Documentation,” U.S. Department of Agriculture, Technical Bulletin No. 1768, 1990.
J.M. Simunek, M. Sejna and M.Th. van Genuchten, “The HYDRUS-2D software package for simulating two-dimensional movement of water, heat, and multiple solutes in variably saturated media, Version 2.0,” International Ground Water Modeling Center, Colorado School of Mines, Colorado, 1999.
M.J. Fayer, “UNSAT-H Version 3.0: Unsaturated Soil Water and Heat Flow model, Theory, User Manual, and Examples,” Pacific Northwest Laboratory, Richland, Washington, 2000.
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