Geochemical evaluation of suitability of sites for hazardous waste disposal: a case study of recent and old waste-disposal sites in Calabar Municipality, SE Nigeria |
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Authors: | B O Ekpo U J Ibok N D Umoh |
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Institution: | (1) Environmental and Petroleum Geochemistry Research Group, Department of Pure and Applied Chemistry, University of Calabar, P.M.B. 1115 Calabar, Nigeria e-mail: bakpo@unical.anpa.net.ng, NG |
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Abstract: | Two waste-disposal sites (old and new) in Calabar Municipality, SE Nigeria were evaluated to assess their suitability as
landfill sites and their impact on the groundwater. The field investigation included surface geological/hydrogeological and
geochemical studies. Leachate and groundwater were sampled and analysed for 3 months (April, May and June, 1997) for geochemical
characterisation. The results indicate that the two waste-disposal sites in the Calabar Municipality do not meet the requirements
as landfill sites. Physico-chemical analyses for temperature, pH, conductivity, dissolved oxygen, biological oxygen demand
after 5 days of incubation (BOD5), sulphate, nitrates, nitrite, trace and major elements in the leachate known to impact human health and the environment,
indicate high levels of pollution. The values for groundwater in the vicinity of the disposal sites were found to be within
the World Health Organisation (WHO) permissible limit.
Received: 29 March 1999 · Accepted: 3 January 2000 |
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Keywords: | Calabar Geochemical evaluation Landfill Leachates Nigeria Waste |
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