Husnul Azan is Senior Lecturer in Division of Bioprocess, School of Industrial Technology, USM. He obtained his Ph.D from University of Wales, Swansea, United Kingdom.  He is a competent person and Certified Environmental Professional in IETS Operation Biological Process. He is also a registered environmental engineer under Board Engineer Malaysia. Mardiana Idayu Ahmad is Senior Lecturer in Environmental Technology within the School of Industrial Technology at USM. She earned her Ph.D from the University of Nottingham, United Kingdom. Research interest: Renewable energy and sustainable technologies for building and environmental applications Research interest: Production of materials from waste by biological process