Abebe, Abrham (2010) Removal Efficiency of Black Cotton Soil in Attenuation of Pollutants from Wastewater for Reusing Wastewaters for Aquifer Recharge: Case Study of Kality Treatment Plant Water and Textile Treatment Plant Water, Addis Ababa, Ethiopia. Masters thesis, Addis Ababa University.
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Abstract
The objective of this study was to assess soil capability in attenuation of pollutants from wastewater and to reuse it for aquifer recharge with indication of ground water protection. Wastewater from textile treatment plant and sewage treatment plant was used. Undisturbed soil core of black cotton soil was used in the first 50cm of soil layer which is placed in 20 PVC plastics to simulate soil column test. Black cotton soil is the dominant soil type in the study area which has high in cation exchange capacity and low electric conductivity this feature is important for retention of nutrients. Three hydraulic loading rates was selected 136mm/d, 181 mm/d and 226mm/d for identification of optimum hydraulic loading rates. The sodium adsorption value of kality treatement plant water and textile treatment plant water was initially 1.65 and1.98 respectively which is under safe range through the system there was an increase trend observed which rise up to 1.92 and 2.64 for the respective water types at 226mm/d and these HLRs where the least removal efficiency was obtained for the two water types showing developement of infiltration problem due to sodium effect which is one of the factor for reduction removal efficiency. From the study maximum removal of most nutrients was observed at 136mm/d hydraulic loading rate than the remaining hydraulic loading rate. At this flow rate highest removal of, BOD, COD, NH3, NO2- PO43-and EC was observed for both water types applied. There was statistically significant difference(P<0.05) between the selected HLRs which shows the influence of flow rates in the removal of nutrients from the system.In the entire column test there was an increase result in output water than the influent water indicating the weak adsorption nature of nitrate and conversion of ammonia to nitrate in the nitrification process. In the paramter selected with the increase of HLR effect of saturation minimizes the soil capacity to remove pollutants was observed. Generally this study shows the suitability of black cotton soil in removal of pollutants from the wastewater, the need of reusing wastewater in managed way for sustainable use of groundwater and the caution it require in the application black cotton soil for aquifer recharge due to permeability problem .
| Item Type: | Thesis (Masters) |
|---|---|
| Subjects: | G Geography. Anthropology. Recreation > GE Environmental Sciences Q Science > Q Science (General) Q Science > QD Chemistry |
| Divisions: | Africana |
| Depositing User: | Selom Ghislain |
| Date Deposited: | 12 Jun 2018 09:54 |
| Last Modified: | 12 Jun 2018 09:54 |
| URI: | http://thesisbank.jhia.ac.ke/id/eprint/4137 |
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