ANALYSIS OF WATER QUALITY OF LAKE TANA USING SOME BACTERIAL INDICATORS, NORTHWESTERN ETHIOPIA
Keywords:Bacteria; E.coli; Lake Tana; Water quality; Fecal contamination.
Water quality degradation is a problem of Lake Tana. The aim of this study was to assess human impacts on water quality of Lake Tana using some indicator bacteria. E.coli was highest at S8 (40 cfu/100 ml) and S7 (48 cfu/100 ml), while at S0, S4 and S5 (0 cfu/100 ml) in the wet season and it increased in the dry season in the range of 2 cfu/100 ml (S0 and S1) to 14 cfu/100 ml (S9). And also, F. coliform showed 0 cfu/100 ml at the reference site (S0) and the highest at the impacted site S7 (232 cfu/100 ml) in the wet season while in the dry season 0 cfu/100 ml was detected at S0 and 103 cfu/100 ml detected at S9. Analysis for total coliform (TC) ranges from 2 cfu/100 ml (S0) to 240 cfu/100 ml (S7) in the wet season and 13 cfu/100 ml (S2) to 136 cfu/100 ml (S9) in the dry season, with an average of 54.6364 cfu/100 ml which indicates the presence of contamination and the water was very poor for drinking.
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