Integrated Fixed Film Activated Sludge Systems for upgrading Hydraulic Capacity and Settling Characteristics of Activated Sludge Processes. Tikrit Journal of Engineering Sciences, [S. l.], v. 18, n. 1, p. 28–41, 2011. DOI: 10.25130/tjes.18.1.09. Disponível em: https://tj-es.com/ojs/index.php/tjes/article/view/491.. Acesso em: 9 sep. 2026.