1. Centre of Biomass and Renewable Energy, Diponegoro University, Semarang, Indonesia
2. Chemical Engineering Department, Faculty of Engineering, Diponegoro University, Semarang, Indonesia
3. Environmental Health Department, Faculty of Health, Dian Nuswantoro University, Semarang, Indonesia
4. Biology Department, Faculty of Sciences and Mathematics, Diponegoro University, Semarang, Indonesia