Characterization and Treatment of Beseka Lake Water Quality Using Microbes to reduce Total Dissolved Solid (TDS) and Alkalinity
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Date
2018-07
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Addis Ababa University
Abstract
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
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, 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.
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Keywords
Total Dissolved Solid, Beseka Lake Water, Alkalinity, Treatment