Biochemical methane potential estimation of feed mixtures used for dry anaerobic digestion | |
| Author | Siripong Manjanthrarat |
| Call Number | AIT Thesis no.EV-13-25 |
| Subject(s) | Sewage--Purification--Anaerobic treatment Bioreactors Methane--Biodegradation |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Environment Engineering and Management |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. EV-13-25 |
| Abstract | The anaerobic digestion of substrate (distiller grain, swine manure and food waste) is a process that has become a promising technology in waste management through the world. Thus, the main goal of this thesis was to find better substrate, optimum I/S ratio and C/N ratio for anaerobic digestion under continuous process. In addition, this research was tested appropriate substrate, optimum I/S ratio and C/N ratio in anaerobic digestion process by BMP test. Biochemical methane potential assay were conducted on several representative substrate components to determine the ultimate biodegradability and conversion efficiency. BMP test was operated under mesophilic condition (37°C). Base on the result obtained that swine manure is better substrate for this experiment because it can produce specific methane production around 159.24 L/kg VS and present methane around 59.26%. The result shows that the highest percent methane around 68.93% and biogas production around 9357.67mL was observer at I/S 2. The highest specific methane production was I/S 3 around 843.71 L/kg VS. From result, swine manure C/N 30 has highest specific methane production around 827.86 L/kg VS, highest percent of methane around 73.98% and highest methane volume around 7813.03mL. It concludes that swine manure at I/S ratio 2 and C/N ratio 30 is better ratio for mixture substrate in this experiment. Reactor experiment was researched to find optimum I/S ratio and C/N ratio. Reactor experiment was operated under mesophilic condition (37°C). Operation reactor has two phases i.e. start-up phase and continuous phase. In final phase, experiment was conducted for three different loading which operate 25 days in each loading. Base on the result obtained that I/S ratio 2 can produce the methane yield around 405.29 L/kg VS and highest percent methane around 59.44%. the highest volatile solid removal of 30.95% was observer at I/S 2. C/N ratio variation was tested to research appropriate C/N ratio under continuous process. This study found that as organic loading rate increased, the biogas production increased. The methane yield of C/N 30 obtained was 259 L/kg VS, 473 L/kg VS and 462 L/kg VS from OLR 2, 3.5 and 5 kg VS/m³.day. However, when loading was increase to 5 kg VS/m³.day, the significant deterioration of biogas composition as well as production was observed. The highest percent methane around 68.47 % at OLR 3.5 kg VS/m³.day was observed at swine manure C/N ratio 30. The volatile solid removal of 24.49%, 22.05% and 18.81% were obtained during the 2, 3.5 and 5 kg VS/m³.day respectively. These were observed at swine manure C/N ratio 30. |
| Year | 2013 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Department of Energy and Climate Change (Former title: Department of Energy, Environment, and Climate Change (DEECC)) |
| Academic Program/FoS | Environmental Engineering and Management (EV) |
| Chairperson(s) | Visvanathan, C.; |
| Examination Committee(s) | Annachhatre, Ajit P.;Anal, Anil Kumar; |
| Scholarship Donor(s) | Royal Thai Government;Asian Institute of Technology Fellowship; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2013 |