Hadiyanto, H, Center of Biomass and Renewable Energy (C-BIORE), Department of Chemical Engineering, Diponegoro University, Jl Prof. H. Soedarto, SH, Tembalang, Semarang 50275 Department of Chemical Engineering, Diponegoro University, Jl Prof. H. Soedarto, SH, Tembalang, Semarang 50275 Master Program of Environmental Science, School of Postgraduate Studies, Diponegoro University, Jl Imam Bardjo, SH No 3, Semarang 50241