Effect of Recycle Ratio and Hydraulic Retention Time on the Performance of Extended Aeration Activated Sludge. Tikrit Journal of Engineering Sciences, [S. l.], v. 20, n. 1, p. 15–29, 2013. DOI: 10.25130/tjes.20.1.09. Disponível em: https://tj-es.com/ojs/index.php/tjes/article/view/390.. Acesso em: 9 sep. 2026.