A. H. AL-Abdaly A, K. K. Al-Ahmady D. Effect of the hydraulic detention time and the volumetric ratio of anaerobic to aerobic zone on the efficiency of the upgraded activated sludge units using (Bardenpho) system. AREJ [Internet]. 2014 Feb. 28 [cited 2025 Aug. 7];22(1):97-109. Available from: https://ojs.uomosul.edu.iq/index.php/arej/article/view/26914