Food waste anaerobic digestion digestate treatment and management strategies | |
| Author | Souksaveuy Keotiamchan |
| Call Number | AIT Thesis no.EV-18-28 |
| Subject(s) | Sewage--Purification--Anaerobic treatment 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-18-28 |
| Abstract | Food waste is one of the highest compon ents of municipal solid waste. Improper management can lead many environmental problems such as odor issue and greenhouse gas (GHG) emission contribution. Therefore, anaerobic digestion is an alternative practice to deal with food waste as well as other or ganic waste, because there are many several benefits by using this technology namely biogas generation, nutrient recovery and also reducing GHG emission. Digestate is a by - product of anaerobic digestion which rich in nutrient content. However, without prop er treatment and management, it can lead many environmental issues as well. This study was carried out to manage and treat food waste digestate of a pilot scale wet anaerobic digestion. The aim of this study is to characterize and identify the suitability of using liquid and solar dried solid digestate obtained from the wet anaerobic digestion of food waste as biofertilizer . In addition, GHG emission estimation from different scenarios of management options is included in this study. Raw digestate was sep arated into liquid and solid fraction which were characterized for the quality. It was found that m ost of the parameters were in the range to use for agricultural application. The pH value of raw digestate, liquid and solid fraction were in the range of 7. 06 to 7.75. The maximum value of pH value was present in solid fraction was about 7.75. When compared total nitrogen (TN) of each fraction, highest TN presented in liquid fraction was about 60 mg/g. Similarly, maximum total potassium contained in liquid fr action was 8.40 mg/g. Solid fraction, the highest amount of phosphorus content was 3.2 mg/g. TP of liquid fraction and TK of solid fraction were found to be lower than TK of commercial fertilizer. TN content of both fractions were sufficient to use for la nd application. GHG emission potential from food waste, raw digestate, liquid fraction and solid fraction were estimated to find the best management option. It was found that there w ere about 347 , 43, 28 and 7 g CO 2 equivalent/kg , respectively. When digestate is managed for five different scenarios, the net GHG emission was different. Treating digestate by liquid - solid separation and solar drying can save net GHG emission by 301 CO 2 equivalent/kg digestate when is applied for land application. H ence, it was the best option. The worst management is dumping digestate to landfill due to 59 CO 2 equivalent/kg were emitted. When the raw digestate is applied for agricultural industrial, it also can save net GHG emission about 296 CO 2 equivalent/kg diges tate . Whereas, the net GHG emission cannot be saved, if the digestate is managed only solid fraction, but the liquid fraction is dumped to landfill. As a result, net GHG emission potential was about 33 CO 2 equivalent/kg digestate which will be emitted from this management option. The other good management option is that the liquid fraction is utilized for land application, it can save net GHG emission about 238 CO 2 equivalent/kg digestate . |
| Year | 2018 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. EV-18-28 |
| 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) | Chettiyappan Visvanathan; |
| Examination Committee(s) | Vilas Nitivattananon;Ekbordin Winijkul; |
| Scholarship Donor(s) | Thai Pipe Scholarship; |
| Degree | Thesis (M. Sc.) - Asian Institute of Technology, 2018 |