Research Article
The Role of Natural Ecosystem in Purifying Municipal Wastewater in Bahir Dar Metropolitan City
@INPROCEEDINGS{10.1007/978-3-030-15357-1_47, author={Fitfety Melese and Ayalew Wondie and Nigus Gabye}, title={The Role of Natural Ecosystem in Purifying Municipal Wastewater in Bahir Dar Metropolitan City}, proceedings={Advances of Science and Technology. 6th EAI International Conference, ICAST 2018, Bahir Dar, Ethiopia, October 5-7, 2018, Proceedings}, proceedings_a={ICAST}, year={2019}, month={3}, keywords={Ecosystem Wetland Wastewater}, doi={10.1007/978-3-030-15357-1_47} }- Fitfety Melese
Ayalew Wondie
Nigus Gabye
Year: 2019
The Role of Natural Ecosystem in Purifying Municipal Wastewater in Bahir Dar Metropolitan City
ICAST
Springer
DOI: 10.1007/978-3-030-15357-1_47
Abstract
The main purpose of this study was to study the Ecosystem functionality in purifying municipal wastewater. Three drainage lines were selected to determine the efficiency of ecosystem in purifying waste water. The water quality parameters considered for this study were dissolved oxygen, total dissolved solids, biological oxygen demand, pH, conductivity, nitrate, phosphate, and ammonia. Pollutant load concentration flowing along to the three drainage lines and contributions to the Blue Nile river pollution were determined for the months March to May 2018. The load of BOD, TDS, and electrical conductivity, pH, nitrate, phosphate, and ammonia were reduced by 58.10%, 54.33%, 53.50%, 13.55%, 52.28%, and 75.20% respectively. The average concentration load of dissolved oxygen for canals #1 and #2 were enhanced by 70% while for Blue Nile river course it is reduced by 18%. Although the natural ecosystem show significant amount of reduction in chemical pollutants, the concentration in some parameters were still above the standard which requires enhancement of the ecosystem. Most water quality parameters of effluents at the Blue Nile river(Downstream) except BOD and DO were with within levels set by international standards for effluents to be discharged to surface water and FAO maximum permissible level set for waste water to be used for irrigation purposes. To reverse the adverse outcomes of effluents, treating wastes and preservation of the ecosystem is beneficial.