Browsing by Author "Yasin, Ahmed"

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    Characterization and Treatment of Beseka Lake Water Quality Using Microbes to reduce Total Dissolved Solid (TDS) and Alkalinity
    (Addis Ababa University, 2018-07) Yasin, Ahmed; Solomon, Kiros (PhD)
    Water is one of the natural resource that used for irrigation, industrial, sanitation and other purpose that facilitate human activity. Lake Beseka is volcanically dammed, endorheic lake, which is located to the East direction, situated around 200 km from Addis Ababa, the capital city of Ethiopia. The Lake water is saline and alkaline with high concentration of fluoride so that the water could not be used for drinking and irrigation purpose. Different infrastructures such as a health center, high school, youth center, offices and others were affected by the lake flooding. So, this lake needs to be treatment. In present study, biological neutralization of saline- alkaline beseka lake water in the presence of glucose (carbohydrate) as carbon source was studied. To do so, determination of physiochemical characteristics of the lake water, which was pH, EC, TDS, HCO3 - , total alkalinity, chloride and fluoride were measured and also isolation of bacteria were carried out. In this study Bacillus alkalophilus bacteria was also used to compare its treatment performance with isolate (T1). Treatments of lake water sample at different pH, incubation time and inoculum size were monitored. Maximum removal of total alkalinity and TDS (Total Dissolved Solid) were observed at pH, incubation time and inoculum size of 9,72hr and 32ml respectively. Which is resulted in removal of total alkalinity; 774.669mg/l and TDS;1939.92mg/l for isolated (T1) and total alkalinity;779.631mg/l and TDS;1944.97mg/l for Bacillus alkalophilus from original value. Based on these findings, isolated (T1) bacteria were shown to be have good performance for biological treatment of beseka lake.