Integrated Fixed Film Activated Sludge Systems for upgrading Hydraulic Capacity and Settling Characteristics of Activated Sludge Processes. Tikrit j. eng. sci. [Internet]. 2011 Mar. 31 [cited 2026 Sep. 10];18(1):28-41. Available from: https://www.tj-es.com/ojs/index.php/tjes/article/view/491