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| dc.contributor.author | Sahlu, Mhiret Gela | |
| dc.date.accessioned | 2022-11-29T07:09:51Z | |
| dc.date.available | 2022-11-29T07:09:51Z | |
| dc.date.issued | 2022-02 | |
| dc.identifier.uri | http://ir.bdu.edu.et/handle/123456789/14577 | |
| dc.description.abstract | Microplastics (MPs) pollution in water bodies, wastewater, and sewage is of concern due to their probable effects on the environment and human health. The present study explores first-time attempts of MPs pollutions in sediment and agglomerated sewage water samples from ditches of Bahir Dar city, Ethiopia. Samples were collected from four major urban ditches at three points (lower, middle, and upper streams). The occurrence and abundance of MPs in two-class sizes (> 500 µm) and (< 500 µm) were considered and characterized. MPs particles were enumerated using a microscope and polymers were identified using FTIR. Moreover, Image J software was used for microscopic image analysis to determine the size of MPs. The abundance of MPs (in mean value) was recorded in a range from 1.33 ± 0.58 to 5 ± 1.00 items/50 g and 1.00 ± 0.00 to 3.00 ± 1.00 items/50 ml for 4.172 µm to 500 µm in sediment and agglomerated sewage water samples respectively. In addition, the mean value of MPs abundance for the particle size of 500 µm to 5 mm was recorded in a range from 0.67 ± 0.58 to 2 .33± 0.58 items/50 g in sediment and 0.67 ± 0.58 to 1.33 ± 0.58 items/50 ml in agglomerated sewage water samples. Moreover, 56.5 % in sediment and 43.5 % in agglomerated sewage water were calculated from a total of 239 MPs particles. Out of this, 61.09 % of the particles were a size of < 500 µm with the dominant fragment shapes and transparent colors. Polyethylene (PE), Polypropylene (PP), Polystyrene (PS), and polyamide (PA), were the detected polymer types in both sample types. But, polyethylene terephthalate (PET) and polyvinylchloride (PVC) were detected only in sediment. Comparatively, PE and PP were the most detected ones in the entire sample. Undeniably, the polymer risk index (H) values in sediment, agglomerated sewage water, and the entire study were recorded as 906.5, 15.2, and 557.7, respectively. ANOVA analysis revealed that the sample type, the ditch type, and the three positioned sampling locations were affecting the MPs' size and their abundance. Finally, the result of this study revealed that the risk of MP pollution in Bahir Dar city attain at a high level, especially in sediment. Thus, policymakers are required to develop a certain strategy to replace plastic polymers with safer materials and reduce the pollution level. Also, emphasizing the ‘3R’ (Reduce, Reuse, and Recycle) principles is recommended for plastic waste management. Keywords: Bahir-Dar; Ditch; FTIR; Microplastic; Microscope; Sediment; Synthetic-Polymers; Water | en_US |
| dc.language.iso | en_US | en_US |
| dc.subject | MECHANICAL AND INDUSTRIAL ENGINEERING | en_US |
| dc.title | Investigation of microplastics pollution in sediment and agglomerated sewage water of the urban ditches: The first attempt in the case of Bahir Dar city | en_US |
| dc.type | Thesis | en_US |
