Physicochemical and Bacteriological Water Quality Assessment in Lake Ziway with a Special Emphasis on Fish Farming

Rado, Berhanu (2008) Physicochemical and Bacteriological Water Quality Assessment in Lake Ziway with a Special Emphasis on Fish Farming. Masters thesis, Addis Ababa University.

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Abstract

The purpose of this thesis was to evaluate the physicochemical and bacteriological water quality aspect of Lake Ziway in relation to Fish Farming. On global scale water pollution, i.e. microbial water pollution, pose the greatest problem. Chemical pollution is also of a great concern. Twenty grab samples from twenty sampling site ten from the surface and ten from the bottom were collected using Kemmerer volume sampler. A total of sixty samples were collected and analyzed for physicochemical, bacteriological, and heavy metal using standard methods. COD result showed a maximum value of 3500mg/l and minimum value of 110 mg/l. Similarly BOD5 ranges from189.81mg/l to 8.57 mg/l. The temperature of this lake is in between 20 and 23 oC. Dissolved Oxygen is found to be 6.7 to 10.05 mg/l. The lake is well-oxygenated, which a sign of healthy lake. At almost all sampling sites NH3 is greater than 0.4 mg/l. The minimum value of Turbidity, Total Solids, and Total dissolved Solids, and Electrical Conductivity is 62mg/l, 356 mg/l, 251 mg/l and 251 m s/cm, while the maximum value is 596mg/l, 462 mg/l, 304 mg/l, and 458 m s/cm, respectively. The pH of Lake Ziway is nearly alkaline (with a pH greater than 8 in almost all sample sites). TN is found to be greater than TP. The concentration of (Chloride) Cl- is similar along the lakes in all sample sites with a value greater than 14mg/l in all sites being sampled. The range of concentration of heavy metals such as Cd, Cr, Zn, Pb, Al, Mn, Ni, and Cu is, 0.3538mg/l, 0.295mg/l, 0.0083mg/l, 0.636mg/l, 1.862mg/l, 0.0828mg/l, 0.0018mg/l, and 0.0012mg/l respectively. This study indicated that, there is an increment of nutrient input into this fresh lake system. This may result in the Eutrophication of the lake and consequently deterioration of the water quality in the future. Hence, urgent action is required for the sustainable use of the Lake, before its quality goes behind the turning point.

Item Type:	Thesis (Masters)
Subjects:	Q Science > QD Chemistry Q Science > QH Natural history > QH301 Biology Q Science > QL Zoology Q Science > QR Microbiology S Agriculture > SH Aquaculture. Fisheries. Angling T Technology > TD Environmental technology. Sanitary engineering
Divisions:	Africana
Depositing User:	Selom Ghislain
Date Deposited:	24 May 2018 06:11
Last Modified:	24 May 2018 06:11
URI:	http://thesisbank.jhia.ac.ke/id/eprint/4067

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