Kinetics Modelling of Batch Anaerobic Co-digestion of Domestic Primary Sewage Sludge and Food Waste in a Stirred Reactor

Postgraduate Symposium in Civil and Environmental Engineering 2019

生态环境科学;土木建筑工程

Mariam Sulaiman, Siti^1 ; Seswoya, Roslinda^1

Micro Pollutant Research Centre, Department of Water and Environmental, Faculty of Civil and Environmental Engineering, Universiti Tun Hussein Onn Malaysia, Parit Raja, Johor Batu Pahat

86400, Malaysia^1

关键词: Anaerobic co-digestion;    Anaerobic digester;    Anaerobic digestion process;    Automatic methane potential test systems;    Biochemical methane potential;    Kinetics modelling;    Kinetics parameter;    Ultimate methane yields;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/601/1/012012/pdf
DOI  :  10.1088/1757-899X/601/1/012012

来源: IOP

【 摘 要 】

Anaerobic digestion was conventionally applied for treating sewage sludge. However, the accumulation of solid waste particularly food waste has reach the critical levels worldwide. In practice, the food waste was dumped into the landfill for ultimate disposal. However, the greenhouse gases produced in the landfill makes this is no longer a preferable option. Anaerobic digestion was seen as an alternative for managing the food waste in a sustainable way. Methane, a renewable energy is potentially in replacing fossil fuel. However, the methane yield from the digestion of food waste inefficient. Therefore, a study of the co-digestion of sewage sludge and food waste was conducted to investigate the improvement of the methane yield. This study was conducted by using a mixture of domestic primary sewage sludge and food waste as a co-substrate for the anaerobic digester. The kinetics modified Gompertz modelling was applied to describe the anaerobic digestion process. A series of batch biochemical methane potential (BMP) assay was prepared using Automatic Methane Potential Test System (AMPTS II) to investigate the anaerobic digestibility of the mixture of domestic primary sewage sludge and food waste. The BMP assay showed that the co-digestion improved the ultimate methane yield by 32.6% higher than domestic primary sewage sludge alone, indicated that the co-substrate characteristics influencing the methane yield. Besides that, the greater VS/TS ratio of the substrate also resulted in the greater methane yield. The kinetics parameter from the modelling analysis were slightly lower as compared to the laboratory data.