Effect of the Addition of Fat Oil and Grease (FOG) on the Performance of a Dry Anaerobic Digestion Food Waste Reactor

• Main Authors: Dwita Fitriani Wijayanti, Nyoman Suwartha, Cindy Rianti Priadi
• Format: Article
• Language: English
• Published: Universitas Indonesia 2018-04-01
• Series: International Journal of Technology
• Subjects: Anaerobic digestion (AD); Fat oil and grease (FOG); Food waste; Waste management
• Online Access: http://ijtech.eng.ui.ac.id/article/view/1139

Organic waste mostly comes from food waste, which has characteristics of high concentrations of nitrogen and fat, and high humidity. Domestic waste in Indonesia has a high organic content, which is suitable for anaerobic conditions. Waste oil and fat can be used as co-substrates and are helpful in yielding biogas in an anaerobic digestion (AD) process. The aim of this research is to analyze the performance of a food waste dry anaerobic digestion reactor after the addition of fat oil and grease (FOG) waste. The research was conducted using a semi-continuous stirred tank reactor (SCSTR) with an active volume of 400 L, operated at an average temperature of 27.8±1.07oC. Two experimental scenarios were performed, using varying types of food waste, food waste with cow dung as substrate, and FOG waste as co-substrate. The experiment was conducted using an Organic Loading Rate (OLR) of approximately 10 kg VS/m3, with a constant mixing intensity of 30 rpm. The results show that there was a significant difference between the input of food waste substrate with and without the addition of FOG (p