1. Department of Chemical Engineering, Universitas Pembangunan National “Veteran” Jawa Timur, Surabaya 60294 Indonesia
2. Department of Chemical Engineering UNTAG University in Semarang, Bendhan Dhuwur Campus, Semarang 50233, Indonesia
3. Centre for Waste Management, Department of Mechanical Engineering, Diponegoro University, Tembalang Campus, Semarang 50275, Indonesia
4. Brandenburgische Technische Universitat Cottbus-Senftenberg, Germany