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University of Gezira (2018)

Generation of Biogas from Qat and Cow Dung using Anaerobic Co-digestion

Alkatf, Ahmed Ali Yahiya

Titre : Generation of Biogas from Qat and Cow Dung using Anaerobic Co-digestion

Auteur : Alkatf, Ahmed Ali Yahiya

Université de soutenance : University of Gezira

Grade : Master of Science (MS) in Chemical Engineering 2018

Résumé
Biogas, a clean and renewable form of energy, which produced by bacteria through the bio-degradation of organic material under anaerobic conditions. An interesting option to improve yields of anaerobic digestion is the treatment of different substrates in a process called anaerobic co-digestion. In most of the cases addition of co-substrates improves the biogas yield due to a better balance of nutrients in the digestion medium. The goal of this research is to study biogas generation from anaerobic co-digestion of qat and cow manure in different mixture ratios. In this study, the performance of anaerobic co-digestion of qat and cow dung was carried out at seven different mixture ratios of qat (CE) to cow dung (CD), 1:0, 9:1, 3:1, 1:1, 1:3, 1:9 and 0:1. The water was added to the mixture to get a solution of total mass 1250g with total solid 8%TS, this was charged into seven digesters of 2 liter plastic bottles and labeled R1, R2, R3, R4, R5, R6 and R7. The daily biogas generated under ambit temperature was recorded for the seven digesters. The volume of biogas generated was measured by using the water displacement method for a hydraulic retention time HRT of 14 days. The order of biogas generation result was R4 (50% CE + 50% CD) > R3 (75% CE + 25% CD) > R5 (25% CE +75% CD) > R2 (90% CE + 10% CD) >R1 (100% CE + 0% CD) >R6 (10% CE + 90% CD) >R7 (0% CE + 100% CD). The digester R4 generated the highest total volume of biogas of 3505 ml. The lowest biogas yield was generated from R7 with total biogas volume of 1175 ml. The result of this research on the generation of biogas from cow dung and qat has shown that the highest biogas can be generated from these wastes at mixture ratio 1:1 through anaerobic co digestion. These wastes are available in Yemen environment and can be used as a source of fuel. It is recommended that further studies should be done including physical and chemical parameters in different conditions.

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