Paper Title
ANALYSIS OF FISH WASTE AND CO-SUBSTRATE MIXTURE ON BIOGAS PRODUCTION AND SOLID WASTE REDUCTION IN AN ANAEROBIC DIGESTER

Abstract
Abstract - Indonesia is the second-largest global producer of marine resources, with over 62,388 Fish Processing Units (UPI) located around the country. In the management of marine products, fish waste constitutes approximately 30-40% of total fish weight and consists of heads, bones, fins, skin, and offal, whereas liquid waste can come from fish blood and fish wash water, both of which can be harmful to the aquatic environment and are a source of eutrophication in coastal areas. Anaerobic digester (AD) processing is an approach to generate biogas and digestate which is appropriate for fertilization. The study used two pilot scale reactors with 110 cm in diameter, 160 cm in height, and 1200 L in volume. The composition of fish waste, food waste, cow dung, and sawdust were used in the following ratios: 40: 40: 15: 5 (reactor A) and 30: 30: 20: 20 (reactor B). The objective of this study was to evaluate the effectiveness of the anaerobic co-digestion process in terms of reducing solids, increasing biogas production, and analyzing its composition. According to the results, there was a reduction in solid waste of 97.42% (reactor A) and 97.95% (reactor B). The daily production of biogas from reactors A and B is 155,8 and 133,56 liters, respectively. The average methane composition content in both reactors is 61,9%. Methane yield in this result were 122.37 L.CH4/kg.VS (reactor A) and 131.76 L.CH4/kg.VS (reactor B). The results of the research indicate that there is not a significant difference between the composition ratios in reactor A and reactor B regarding solid reduction, biogas volume, or methane yield. As a result, the two composition ratios can be used to determine the composition of waste treatment using an anaerobic digester. Keywords – Anaerobic Digester, Biogas, Fish Waste, Reactor