Performance evaluation of thermophilic wet anaerobic digestion for food waste treatment | |
| Author | Chirawit Leelayouthayothin |
| Call Number | AIT Thesis no.EV-18-07 |
| Subject(s) | Food--Waste disposal Anaerobic treatment |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Environmental Engineering and Management |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. EV-18-07 |
| Abstract | Food waste management is a global issue which is projected to increase in next 25 years due to economic expansion and population growth. The presence of food waste in municipal solid waste decreases recycling rate and increases landfilling rate. Anaerobic Digestion technology can offer sustainable food waste management, recovering energy, and resources. Anaerobic digestion at thermophilic temperature leads to better degradation and higher biogas production than mesophilic temperatures. In this study, the experiments were implemented on both laboratory scale and bench scale. As the biochemical methane potential ( BMP ) test can de termine the concentration of organics in organic substrate that can be anaerobically converted to CH 4, BMP test was carried out to determine the ultimate CH 4 production from food waste. Moreover, continuously stirred tank r eactor ( CSTR ) was operated in the rmophilic condition at 55°C with organic loading rates of 1, 2, 3, and 4 kg VS/m 3 .day. The performance evaluation of the anaerobic digestion process was measured by three performance indexes including methane production (L/d) , methane yield (m 3 / kg VS), and VS reduction (%). The average biogas productions of the system at OLR of 1, 2, 3, and 4 kg VS/m 3 .day were found to be 86, 178, 223, and 224 L/d respectively. The methane content of biogas were 60.07%, 59.17%, 62.92%, and 53.66% at OLR of 1, 2, 3, and 4 kg VS/m 3 •day respectively. The average methane production values were 52, 105, 140, and 120 L/d at the OLR of 1, 2, 3, and 4 kg VS/m 3 .d respectively. The biogas yield values were 0.99, 1.02, 0.85, and 0.64 m 3 /kg VS adding at OLR of 1, 2, 3, and 4 kg VS/m 3 •day respectively. The methane yield values were 0.597, 0.603, 0.536, and 0.345 m 3 CH 4 /kg VS adding and VS reduction were 84.06 %, 85.03 %, 81.30 %, and 76.84 % at the OLR of 1, 2, 3, and 4 kg VS/m 3 .d respectively. As a result, the optimum OLR was 3 kg VS/m 3.d which was indicated by highest methane production, high VS reduction, and high methane yield. In BMP test at thermophilic condition, VS reduction of food waste is 82.07% and methane yield of food waste is 0.791 m 3 CH 4 /kg VS adding. This study establishes that thermophilic AD was better than mesophilic AD with higher biogas & methane yield, higher VS reduction, ability to withstand more OLR, and better stability |
| Year | 2018 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. EV-18-07 |
| 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) | Ekbordin Winijkul;Salam, P. Abdul; |
| Scholarship Donor(s) | Royal Thai Government Fellowship; |
| Degree | Thesis (M. Sc.) - Asian Institute of Technology, 2018 |