Hailemicael, Alemayehu (2006) Developing Biological Processes for the Treatment of Malt Factory Effluent: Case of Assela Malt Factory. Masters thesis, Addis Ababa University.
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Abstract
Understanding the nature of wastewater is fundamental for the design of appropriate wastewater treatment plants and the selection of effective treatment technologies. The objective of the study was to develop biological processes and evaluate its effectiveness for the treatment of Malt Factory Effluent. While developing a lab-scale biological treatment for Assela Malt Factory, quality and quantity of periodically taken samples at different stages of production process were taken and characterized for their composition using standard methods. Significant fluctuation in the amount of COD was observed (3251+ 530.48- 1190.75+ 798.68). COD: BOD ratio (1:2.93-2.99) indicated that the wastewater is amenable to biological treatment. Spent grains, germules and other skimmed materials contribute to increased total suspended solid of wastewater. The nutrient loads for the wastewater also vary at different sites of the production process. For instance, phosphate was found to be high in first wet steep (55.92+ 21.57), nitrogen at second wet steep and sulphate in the treated inlet raw water. General evaluation of anoxic and aerobic lab-scale bioprocess wastewater treatment plant indicated that the effluent released from Assela Malt factory is liquid enough to meet discharge limits with over 94% removal efficiency for BOD and COD, with the exception of phosphate for the treatment of malt factory effluent. Adjacent to end of pipe treatment, incorporating physical screening and sorting spent grains, before joining equalization tanks; cleaning processes through integrated water management technique is recommended to reduce COD level in the effluent and the amount of wastewater requiring disposal. Such clean in place activities would greatly contribute and made the wastewater to be treated well below the effluent discharge limits; hence, reusing them for different applications becomes possible. Finally, before establishing treatment plant for the factory effluent, on-site pilot scale treatment plant is recommended based on characterization and performance evaluation of the developed lab-scale anoxic and aerobic bioprocess treatment-plant.
| Item Type: | Thesis (Masters) |
|---|---|
| Subjects: | H Social Sciences > HD Industries. Land use. Labor Q Science > Q Science (General) Q Science > QH Natural history > QH301 Biology |
| Divisions: | Africana |
| Depositing User: | Selom Ghislain |
| Date Deposited: | 26 Jun 2018 11:58 |
| Last Modified: | 26 Jun 2018 11:58 |
| URI: | http://thesisbank.jhia.ac.ke/id/eprint/4611 |
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