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By Habtamu Haile Tolera
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Additional resources for Suitability of Local Materials to Purify Akaki Sub-Basin Water
Sample text
These are: "Kur" (Alpine), 3000 m and above; "Dega" (temperate), 2300 m to about 3000 m; "Weina Dega" (Sub tropical), 1500 to about 2300 m; "Kolla" (Tropical), 800m to about 1500 m and "Bereha" (Desert), less than 800m. The Akaki Sub-Basin, which is part of Addis Ababa, is located in the region where the rainy months are contiguously distributed (Daniel 1977). In this basin, there are seven rainy months from March to September with intermittent rainy season occurring from March to May. The heavy rains are from June to September.
27 3 Behavior of Heavy metals in Terrestrial and Aquatic Environments Fig. 5. Eh-pH diagram for Zn-CO2-S-H2O system at 25°C and 1 atm (Wyman 1993). The primary fate of Zn in aquatic environments is mainly controlled by sorption to sediments or suspended solids, including hydrous Fe and Mn oxides, clay minerals, and organic matter. Compared to other inorganic contaminants of environmental interest, the geochemical behavior of Ni in soil and groundwater systems has not been studied extensively (Evanko and Dzombak 1997).
Most communities around the Aba Samuel Lake depend on water wells and sometimes on the most polluted rivers and the reservoir as their drinking water supply. Personal communications and field observations showed that, the community at village Dika uses water well in the village for drinking while the lake water is used for household purposes, drinking for domestic animals and fishing. At extreme dry conditions, the villagers rely on the most polluted waters of the Aba Samuel Lake. Some of the drinking water wells are located few hundred meters away from the lake.