Document Details
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Document Type |
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Thesis |
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Document Title |
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A Thesis Submitted for the Requirements of the Degree of Master of Science (Marine Biology) A Thesis Submitted for the Requirements of the Degree of Master of Science (Marine Biology) |
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Subject |
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Faculty of Marine Sciences |
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Document Language |
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Arabic |
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Abstract |
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Aquaculture has grown quickly recently. Strict environmental regulations have hastened the advances in wastewater treatment systems for the recovery of beneficial products and energy, along with control of pollution. One of the revived bioelectrochemical concepts and hopeful technologies that involve these entire aspects is microbial fuel cell (MFC). MFCs are environmentally friendly technology for electricity harvesting from various substrates. They produce energy through the utilization of the electrons resulting from biochemical reactions catalyzed by bacterial strains. The major challenge for assembling a successful MFC is the identification of material and configurations which are effective in enhancing power density (PD) and coulombic efficiency (CE) and also are cost-effective. The general requirements for MFC include an anode, a cathode, as well as a membrane. There are many factors affecting MFC's performance and electricity production from wastewater. Bacteria in the anodic region are essential because of their metabolism and mediators that are utilized by them to transfer electron to anodic compartment. There are different substances that could be utilized as electron donors and oxidized by bacterial strains. Operating conditions including pH, temperature, ionic strength of media, materials as well as construction of anodic, cathodic and membrane compartments have a significant effect upon energy production. The current study was conducted for treatment of aquaculture wastewater together with electricity production using the upflow MFCs under saline condition. Aquaculture wastewater with salinity 39.2 g/L was obtained (3.92%). Upflow MFCs were utilized to treat aquaculture wastewater and generate electricity. The reactor underwent operation at various organic loads (OL) including 0.5, 0.75,1, 1.25 and 1.5 gCOD/L under saline conditions. The results recorded TCOD removal efficiency was 75%, 81%, 84%, 92% and 79% at the corresponding OL of 0.5, 0.75, 1, 1.25 and 1.5 gCOD/L under saline condition. SCOD removal efficiency was of 68%, 75%, 81% , 91% and 74% at the corresponding OL of 0.5, 0.75, 1, 1.25 and 1.5 gCOD/L. TSS removal efficiency was 47%, 54%, 60%, 78% and 71% at the corresponding OL of 0.5, 0.75, 1, 1.25 and 1.5 gCOD/L. More increase in OL to 1.5 revealed decreases TCOD, SCOD and TSS removal. The voltage production of UMFC at OL of 0.5 gCOD/L was 690 mV, with a PD of 92 mW/m2. Increase in OL to 0.75 and 1gCOD/L resulted in 756 and 810 mV of energy production which accounted 160 and 273 mW/m² of PD, respectively. The maximum PD of 369 mW/m² and the corresponding voltage of 870 mV was produced at the OL of 1.25 gCOD/L (external resistance of 300Ω). Further increment in OL to 1.5 gCOD/L exhibited a decline phase in energy production with 780 mV with a PD of 310 mW/m2. Coulombic efficiency was maximum (60%) at OL 0.5 gCOD/L in UMFC. Increase in OL to 0.75, 1, 1.25 gCOD/L revealed a decreasing pattern of 51%, 43% and 27% of CE. At OL of 1.5 gCOD/L, the CE showed the least value of 21%. The bacterial analysis of anodic compartment samples at various OLs revealed bacterial strains presence in the anode region of UMFC operated under saline condition which were Ochrobactrum, Marinobacter, Rhodococcus, Bacillus,Stenotrophomonas, Xanthobacter, Sphingomonas, Pseudomonas and Sedimentibacter. Ochrobactrum, Marinobacter and Rhodococcus were the dominant species. At optimum OL of 1.25 gCOD/L in UMFC, the bacterial community analysis revealed the dominance of Ochrobactrum (53%), Marinobacter (22%) and Rhodococcus (15%) with potential energy production. OL 0.5 gCOD/L revealed dominance of Ochrobactrum (42%), Rhodococcus (24%) and Marinobacter (15%) with potential energy production. OL 0.75 gCOD/L revealed dominance of Ochrobactrum (48%), Rhodococcus (16%) and Marinobacter (18%) with potential energy production. OL 1 gCOD/L revealed dominance of Ochrobactrum (49%), Rhodococcus (14%) and Marinobacter (21%) with potential energy production. OL 1.5 gCOD/L revealed dominance of Ochrobactrum (44%), Rhodococcus (14%) and Marinobacter (18%) with potential energy production. The current study revealed that 1.25 gCOD/L was the optimized OL for efficient aquaculture wastewater treatment and energy production. |
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Supervisor |
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Dr. Mamdoh T. Jamal |
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Thesis Type |
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Master Thesis |
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Publishing Year |
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1443 AH
2022 AD |
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Co-Supervisor |
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Dr. Arulazhagan Pugazhendi |
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Added Date |
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Sunday, January 8, 2023 |
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Researchers
| غادة غازي الريشي | Alreeshi, Ghada Ghazi | Researcher | Master | |
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