“Progress  in  Anaerobic  Digestion  for  Improved  Biogas Generation : An Overview  of  Technologies  and  Challenges”. Al-Noor Journal of Engineering Management and Computer Science 2, no. 2 (July 4, 2026): 1–25. Accessed July 4, 2026. https://njemcs.edu.iq/index.php/njemcs/article/view/30.