Dr. Eng. Salah Jellali currently holds the position of senior researcher in Water & Environmental Engineering at the Centre for Environmental Studies and Research (CESAR) of Sultan Qaboos University (SQU). His primary research focus revolves around local management and governance of liquid and solid wastes within the framework of circular economy and sustainability. A key area of his expertise involves the conversion of organic biomasses into high-value products such as biochars through pyrolysis process. Dr. Jellali has coordinated and participated in various national and international projects centered on the reuse of biochars as efficient adsorbents for wastewater treatment and/or as biofertilizers in agriculture. Additionally, he has actively contributed as a member of organizing and scientific committees for numerous international conferences on water and environment sustainable management. Dr. Jellali has supervised several PhD theses and Master students regarding sustainable solid and liquid wastes management and one of his PhD students received the presidential award of best national thesis in 2018. Dr. Jellali has authored over 140 peer-reviewed scientific papers and book chapters and received the best researcher award of SQU for the period 2021-2023.