High solid anaerobic digestion of food waste | |
| Author | Yarinee Jumpusri |
| Call Number | AIT Thesis no.EV-17-32 |
| Subject(s) | Anaerobic treatment Food--Waste disposal |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Environmental Engineering and Management |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. EV-17-32 |
| Abstract | The generation of food waste is increasing trend at the present because of economic development and population growth. Thus, food waste collection, treatment, and disposal must to be considered as an essential requirement. From different possible treatment routes, high solid anaerobic digestion (HSAD) is an effective and environmental friendly solution since food waste is an easily biodegradable substrate. By-products from HSAD are biogas and digestate which can be used renewable resources. In this study, Bangkok’s food waste was characterized to study the variation and necessary of pretreatment required for HSAD. Methane production potential of food waste was investigated by HSAD operation under thermophilic condition (55 ̊C). Feed stock was prepared from AIT’s cafeteria with 20% -24% of total solid and fed to the reactor once a day. The produced biogas contained 59% of methane content and the methane yield was 0.631 m³ CH4/kg VS. The highest volatile solid (VS) reduction was 92.23% at organic loading rate (OLR) of 3 kg VS/m³.day. The highest daily biogas production was 551 L/day at OLR 4 kg VS/m³.day. However, from the HSAD operation, increasing of OLRs effected directly to pH dropping in the reactor and it needed to adjust pH with chemicals including NaOH and NaHCO3 at OLR of 4 kg VS/m³.day. BMP test in batch experiment under mesophilic condition (37 ̊C) was investigated to determine the methane yield of food waste, food waste adjusted carbon to nitrogen ration (C/N ratio) with glucose adding, and co-digestion with cassava. The highest methane yield was 0.337 m³ CH4/kgVS with 51% of methane content from food waste without C/N ratio adjustment. The highest VS reduction was 94.65% from co-digestion with cassava at C/N ratio of 25 and 30. With the same C/N ratio of 30, the accumulative of biogas production from co-digestion was higher than glucose adding because co-digestion could improve the buffering capacity of the system. |
| Year | 2017 |
| 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) | Nguyen, Thi Kim Oanh;Loc, Thai Nguyen; |
| Scholarship Donor(s) | Royal Thai Government Fellowship; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2017 |