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ARPN Journal of Science and Technology >> Volume 7, Issue 1, January 2017

ARPN Journal of Science and Technology


Impacts of Waste Dumping on Pomona Medium Sand Clay Loam Soils and Surface Water Quality in Harare, Zimbabwe

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Author Mpofu. K, Nyamugafata. P, Maposa.I, Nyoni. K
ISSN 2225-7217
On Pages 13-19
Volume No. 4
Issue No. 1
Issue Date February 01, 2014
Publishing Date February 01, 2014
Keywords waste dumping, heavy metals, soil quality



Abstract

Municipal and industrial waste generated in Harare is dumped at Pomona dumpsite which is not lined to prevent seepage. The concentration of various heavy metals (Lead (Pb), Iron (Fe), Zinc (Zn), Cadmium (Cd) and Chromium (Cr)) in soils and surface water was measured with a view of determining potential ecological and public health risks. Soil samples were collected from above dump site (control), within the dumpsite and below dumpsite (down slope) at depths of 0-5, 10-20 and 30-40 cm using an auger. Water samples were obtained from shallow dams at Pomona dumpsite. At Pomona, the soil concentrations of Fe and Pb pollutants were apparent (P<0.05) and surpassed the prescribed threshold limit. There was no significant difference in soil microbial biomass among treatments (P>0.05) at Pomona dumpsite. These results imply phyto-toxicity risk of crops cultivated within the vicinity of dumpsites and downstream due to possible bio-magnification of heavy metals in crops and their proliferation up food chain and subsequent health hazard for all living species. It was recommended that the responsible authorities must construct an engineered landfill so as to prevent further environmental contamination.


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