Environmental EngineeringPublished 11 June 2025Retrospective of DIET process for enhanced biogas production during anaerobic digestion of thermal/chemically pretreated waste activated sludgeAbdulaziz Mohammed Almegbl · Ali Mohammad Rahmani · Kamaluddin Kamal · Faris Mohammad A. Munshi · Abbas Khursheed · Muntjeer Ali · Anwar KhursheedFrontiers in Environmental Engineeringdoi 10.3389/fenve.2025.1597684