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Abstract


Solid Waste Management: A Geo-Environmental approach using Remote Sensing Data and GIS

Mohamed Tolba
Mohamed Tolba
Al-Azhar University, Faculty of Science, Geology Department, 11884 Nasr city, Cairo
Tel: (202) 6360003 Fax: (202) 2629356
Email: metolba@yahoo.com



Abstract
Studying the characteristics of the areas proposed to be landfill sites is very important as these sites represent the place in which the solid wastes can be buried safely. The environmental impact of these sites, on groundwater and population, make such studies of very high importance. The aim of this paper is to analyze the parameters that control the choosing of such sites. The study includes four proposed sites, two belong to Cairo governorate, the third in El-Beheira governorate and the fourth in Siwa oasis.

The data used include remote sensing data, geologic data, surface hydrologic data, underground water data and meteorological data. All these data are combined together on a geographic information systems environment.

Landfill site has to be a wide place sufficient for dumping through several tens of years depending on the quantity of solid wastes that will be dumped. It is preferable to be away from surface draining. Ground water have to be protected from the supposed leaching. Wind directions have to be considered in such a way that the odor and pollution will not transfer into the populated areas.

The study indicates that in Cairo governorate El-Wafaa Wal-Amal site needs lining of the new site to prevent leaching as the ground water level is around 150 m apart and completely sealed from the main aquifer of Cairo nevertheless, it will affect the ground water in New Cairo area. El-Salam dumping site represent a catastrophic site as it is surrounded by populated area and the site lies between the longitudinal sand dunes.

In El-Beheira governorate, The water table in Badr landfill proposed site is very high reaching the base of the ex-founded quarry. It means that the lining will be very expensive and sealing will not be perfect. For this reason it is rejected in spite of the fact that, the site is far away from populated area and it is surrounded by vegetation everywhere.

In Siwa oasis, The quantity of daily dumping is very small, The proposed site is topographically higher than the oasis and the site is underlined by thick shale unit of Maghra Formation acting as a natural preventor. The meteorological data support the suitability of the site.

In conclusion, The environmental impact assessment of any proposed landfill site has to be based on the studying of the geology, surface hydrology, hydrogeology and meteorology.