Megawati Megawati, Widi Astuti, Zuhriyan Ash Shiddieqy Bahlawan, Forita Dyah Arianti, Agung Prabowo, Nabila Nabila, Briliyani Shafura Aftisyah, Listya Suci Ramdhani, Sri Devi Eudia Pamusok, Daffa Zamiira Pradana
The usage of cow rumen and rice straw in the production of ethanol will lead to the decrease in agriculture and farming waste. The research is purposed to study the kinetics of sulfuric acid hydrolysis of cow rumen and rice straw using pseudo-homogeneous first order model as well as the kinetics of hydrolysates glucose fermentation by yeast using Gompertz model. The hydrolysis was conducted using 200 mL sulfuric acid in 250 mL beaker glass that was inserted into an isothermal autoclave at various conditions: cow rumen:rice straw ratios (0, 20, 40, 60, 0, and 100%), temperatures (80 and 90 oC), and catalyst concentrations (0.3 and 0.6 M). The fermentation was carried out using 150 mL hydrolysate obtained from hydrolysis with rumen:straw ration of 20:80%, temperature of 80 oC, catalyst concentration of 0.6 M, and time of 90 minutes at various yeast concentrations (9, 15, and 20 g/L). Reaction rate constant decreased when rumen:rice ratio increased and increased when temperature increased. Hydrolysis rate constant at catalyst concentration 0.6 M is higher than 0.3 M. In fermentation, the higher the yeast concentration (9, 15, and 20 g/L), the higher the maximum ethanol production rate (0.20, 0.38, and 0.68 g/L.h). © 2025 Author(s).
Department of Chemical Engineering, Faculty of Engineering, Universitas Negeri Semarang, Gunungpati, Semarang, 50229, Indonesia; Research Centre for Sustainable Production System and Life Cycle Assessment, National Research and Innovation Agency, Bandung, Indonesia
