Radin Maya Saphira Radin Mohamed (PhD) is an Ascociate Profsessor at the Department of Water and Environmental Engineering, Faculty of Civil and Environmental Engineering, Universiti Tun Hussein Onn Malaysia (UTHM) in Batu Pahat, Johor, Malaysia. She has been working with the UTHM since 2004. She graduated with a PhD with her thesis on Environmental Impacts of Greywater Reuse on Home Gardens, from Murdoch University, Perth, Western Australia. Radin Maya Saphira's research involves issues related to improve environmental quality related to their improper discharge. In the last few years, she has extended her research interests to include the low cost treatment system to alleviate the untreated greywater discharge. She is most interested in the use of natural processes and locally available materials. She has coauthored 36 articles in international research journals and a chapter in the book "Cellulase: Production, Applications and Health Benefits" NOVA Science Publishers(2016) and Fourchapters in Handbook of Environmental Materials Management (Springer publisher, 2018). She has also contributed to three teaching modules on environmental engineering. Adel Ali Saeed Al-Gheethi (PhD) is a Senior lecturer at the Department of Water and Environmental Engineering, Faculty of Civil and Environmental Engineering, Universiti Tun Hussein Onn Malaysia (UTHM) in Batu Pahat, Johor, Malaysia. She has been working with the UTHM since 2015. He has also worked as a lecturer and Laboratories manager at the Faculty of Medical Science, Yemeni-Jordanian University and Higher Institute of Health Sciences, in Sana'a, Yemen, for 4 years. He graduated with a Bachelor and Master of Applied Microbiology from Taiz University, Yemen in 2008. He obtained a Doctor of Philosophy (PhD) in Environmental Technology with his thesis on Enzymatic degradation of Pharmaceutical residues in secondary effluents, at Universiti Sains Malaysia (USM), Penang, Malaysia in 2014.  His research focuses on low cost treatment technologies of different types of wastewater which may be used in developing countries. His research interests also include microbiology of wastewater, phycoremediation, pharmaceutical waste, heavy metals biosorption, and antibiotics bio-degradation. He has coauthored 45 articles in international peer-reviewed journals and has authored and coauthored Four chapters in Handbook of Environmental Materials Management (Springer publisher, 2018), a chapter in "Renewable Energy and Sustainable Technologies for Building and Environmental Applications" Springer Publishing (2016) and one chapter in "Cellulase: Production, Applications and Health Benefits" NOVA Science Publishers (2016) as well as. He has also contributed to three teaching modules on environmental engineering. Amir Hashim Mohd Kassim (PhD) is a Senior Professor at the Department of Water and Environment Engineering, Faculty of Civil and Environmental Engineering, Universiti Tun Hussein Onn Malaysia (UTHM) in Batu Pahat, Johor, Malaysia. He graduated with a Diploma in Civil Engineering from the University of Technology, Kuala Lumpur in 1977, a Bachelor of Civil Engineering from the University of Strathclyde, Glasgow, UK in 1981, and a Master of Civil Engineering (Hydrology and Water Resources) from Colorado State University in Fort Collins, USA in 1984. He obtained a Doctor of Philosophy (PhD) in Civil Engineering (Hydrology and Water Resources) at the University of Birmingham, UK in 1989. In addition, he is a registered professional engineer with practice under the board of Engineers Malaysia. Hashim's research involves water resources engineering modelling, hydrology, greywater, and wastewater management and treatment. He has coauthored 39 articles in international peer-reviewed journals, Four chapters in Handbook of Environmental Materials Management (Springer publisher, 2018) and one chapter in "Cellulase: Production, Applications and Health Benefits" NOVA Science Publishers (2016).