1. Faculty of Engineering Universiti Malaysia Sabah Kota Kinabalu Sabah Malaysia
2. School of Civil Engineering Universiti Sains Malaysia, Engineering Campus Nibong Tebal Pulau Pinang Malaysia
3. Solid Waste Management Cluster, Science and Technology Research Centre Universiti Sains Malaysia Engineering Campus Nibong Tebal Pulau Pinang Malaysia
4. Department of Civil and Environmental Engineering, College of Engineering (COE) A'Sharqiyah University (ASU) Ibra Oman