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| dc.contributor.author | Wubayehu Mesfin | |
| dc.date.accessioned | 2021-07-14T05:52:37Z | |
| dc.date.available | 2021-07-14T05:52:37Z | |
| dc.date.issued | 2021-07-14 | |
| dc.identifier.uri | http://ir.bdu.edu.et/handle/123456789/12199 | |
| dc.description.abstract | Water hyacinth is free-floating aquatic weed, which has both negative and positive effects on environment and human beings. This research aimed on the investigation of the Energy production using anaerobic digestion and nutrient recovery from biogas digestate, in up flow bubble column bioreactor for production of energy and nutrient recovery. The study was conducted at College of Agriculture and Environmental Sciences, limnology and water quality laboratory from April (2020) to January (2021). The experiment was performed at pH range of 6.5-7.5, temperature of 37ºC (mesophilic conditions) and at hydraulic retention time (HRT) of 3 and 6 days. 1mL/L of trace element was added into substrate to activate the microbial activity during anaerobic digestion. In this study, the proximate analysis of feedstock, composition of effluent and sludge were characterized as pH, nutrients, solid compositions, chemical oxygen demand (COD), and sludge volume index (SVI). The biogas produced was collected, monitored in gas collector bags and its volume was measured by a wet-type gas meter. The result showed that the total production of biogas was 38.42 L for a period of 90 days. The maximum biogas production rate was 2.35 L/day. Regarding to the composition of biogas, methane and carbon dioxide were found to be 50-75% and 5-45% respectively. While the composition of other gases were estimated as low as 5%. The daily yield of biogas was statically correlated with percentage of methane and carbon dioxide. Organic loading rate and hydraulic retention time have a significant (p< 0.005) effect on the yield of biogas. For a continuous type liquid phase anaerobic digestion process an optimum biogas production was found at organic loading rate of 3.5g COD/L/day, flow rate 0.096m^3/hr. and hydraulic retention time of 3 days. The concentration nutrients increased from 54 ±11.32% in influent to 69 ±9.36% effluent and from 3.97±1.92% influent to 7.47± 4.13% effluent. This shows the former for nitrate and the later one, for phosphate concentration. These nutrients recovered from the anaerobic digestion of water hyacinth can be used as liquid organic fertilizer. Overall, the digestion time, organic loading rate and temperature were found the main operating conditions for the production of biogas during liquid phase anaerobic digestion process. Key words/phrases: Anaerobic digestion, Water hyacinth, Biogas, Organic loading rate, Nutrient recovery. | en_US |
| dc.language.iso | en | en_US |
| dc.subject | Land Resource Managemen | en_US |
| dc.title | ENERGY PRODUCTION USING ANAEROBIC DIGESTION OF WATER HYACINTH AND NUTRIENT RECOVERY FROM BIOGAS DIGESTATE | en_US |
| dc.type | Thesis | en_US |
